Measuring device with metrologically effective ceramic and measuring system for measuring data evaluation as well as computer program product for generating energetic / electrochemical parameters from measuring data of at least one microbial electrochemical technology unit and use

Abstract

A metrological device (10) configured to generate at least one energetic / electrochemical parameter from measurement data based on bioelectrochemical processes, comprising at least one metrological microbial electrochemical technology unit (11) with a cathodic region (11.1) sealed off from the fluid to be examined, and comprising a logic unit (16) with at least one microcontroller (16.1) configured to process measurement data collected over an evaluation period, wherein the metrological device (10) is configured to correlate at least one measured value with at least one process parameter (P SB ) based on the processed measurement data, in particular with a process parameter (P SB) for the chemical / biological oxygen demand (COD / BOD) and / or for a carbon consumption rate and / or for substance fractions of volatile fatty acids; characterized in that the measuring device (10) has at least one active ceramic (12.2) arranged between the cathodic region (11.1) and the fluid to be examined as a component of the metrological microbial electrochemical technology unit (11), which separates the cathodic region (11.1) from the fluid to be examined, wherein the measuring device (10) is configured by means of the at least one ceramic (12.2) to generate the at least one energetic / electrochemical parameter from measurement data collected over an evaluation period of at least 30 days, in particular measurement data from cell-internal resistance components and / or voltage, capacitance, current, power, and / or electrical charge measurement data.

Description

TECHNICAL FIELDThe present invention relates to a metrological device for generating at least one energetic / electrochemical (cell) parameter from measurement data (or electrical signals) based on bioelectrochemical processes, having at least one metrological microbial electrochemical technology unit with a cathodic region sealed off or separated from fluid to be examined, and having a logic unit with at least one microcontroller configured to process measurement data recorded over an evaluation period, wherein the metrological device is configured to correlate at least one measurement value with at least one process parameter based on the processed measurement data, in particular with a process parameter for the chemical / biological oxygen requirement of a process to be optimized. The present invention further relates to a measurement system for measurement data evaluation comprising at least one such measurement device, in particular in connection with water treatment processes. The present invention is also hereby related to a computer program product for implementing a method for generating at least one energetic / electrochemical parameter from measurement data of at least one metrological microbial electrochemical technology unit based on bioelectrochemical processes, wherein at least one measurement value is correlated with at least one process parameter, in particular in long-term measurement series over a duration of at least 30 days, preferably at least two or three months. The present invention also relates not least to a computer program product for carrying out steps of a measurement method carried out by means of at least one such measurement device and to the use of a membrane electrode assembly with ceramic in such a measurement device. In particular, the invention relates to apparatuses and uses each according to the preamble of the respective independent claim.BACKGROUND OF THE INVENTIONIn the implementation of microbial fuel cells (MBZ) for various metrological applications, there have been, in particular, cost-related challenges and technical hurdles with regard to long-term stability. In many metrological applications, a behavior of the measurement object must be examined over at least several weeks or months. The measurement boundary conditions which change greatly in the case of previous MBZ as a function of time cannot be readily taken into account so far and therefore cannot be calculated without errors or not with good measurement reliability. This makes it difficult on the one hand to create a loadable data base and on the other hand also to evaluate it. In addition, the comparatively high costs per measurement point / location may be too great a burden of implementing MBZ. For example, the cathode material remains a strong cost driver. Nevertheless, it would be desirable to be able to further utilize the potential of MBZ, for example in connection with the determination of the chemical oxygen demand (COD) in (ab) water treatment processes over a comparatively long period of many weeks or months, for example also in connection with the determination of the biological oxygen demand (BOD) in (ab) water treatment processes, advantageously also redundantly at a plurality of measurement points / point.According to the prior art, attempts are also made, in particular in the field of water analysis, to implement MBZ and / or electrolysis cells, for example for the determination of the oxygen concentration, in particular starting from the current flow or a corresponding electrical signal. The problem in this context has up to now remained of the high influence of performance-relevant signal interferences and environmental factors. Not least, there have not been known promising measures which contribute to overcoming the so-called scaling problem, i.e. the (salt) deposition problem with a creeping loss of the sensory or analytical capabilities. On this basis, there is also interest, especially in the field of water analysis, in improved long-term stability in combination with a more loadable correlation of measured values and instantaneous oxygen demand.By way of example, the publication U.S. Pat. No. 11,352,272 B2 can be mentioned, which describes a bioelectrochemical current-operated sensor based on an electrolysis cell, in particular for use in the context of process optimization measures in wastewater treatment.Proceeding from the prior art, a need for long-term stable analytics with a high measurement value / measurement data quality or high correlation significance is to be felt even over a long measurement period. Not least, particularly with regard to the previously comparatively high costs per measurement point, there is also interest in a very cost-optimized implementation of water analysis or water sensor system in such a way that a quantity scaling for several or even very many measurement points can potentially be realized, in particular also against the background of improving the quality of the data basis that can be generated.SUMMARY OF THE INVENTIONIt is an object to provide a metrology device and a computer program product configured to implement a corresponding metrology method, with which energetic / electrochemical parameters can be generated from measurement data based on bioelectrochemical processes with particularly good long-term stability and as low a level of technical complexity as possible and can be evaluated with a high data quality. It is also an object to configure a / the computer program product for implementing a / the measurement method in such a way that, on the one hand, a particularly loadable and possibly also extensive data basis can be advantageously created and, on the other hand, this created data basis can also be advantageously evaluated or analyzed, in particular within the scope of the generation of at least one target or manipulated variable for the purpose of (process) water treatment measures over longer periods of several months, in particular during (ab) water treatment. It is not least the object to design a metrology system equipped with at least one such metrology device in such a way that a comparatively exact and extensive correlation of different types of measurement data or process parameters with respect to the most variable application-specific implementation possible can be ensured, optionally at a multiplicity of measurement points.This object is achieved by a metrological apparatus according to claim 1 and by a metrological system equipped therewith and by a computer program product for implementing a corresponding metrological method, in particular in combination with a processual control / regulation, and by uses according to the corresponding independent use claim. Advantageous refinements of the invention are explained in the respective dependent claims. The features of the exemplary embodiments described below can be combined with one another, provided that this is not explicitly negated.A metrological device is provided which is configured to generate at least one energetic / electrochemical (cell) parameter from measurement data (or electrical signals) based on bioelectrochemical processes, having at least one metrological microbial electrochemical technology unit, MET, with a cathodic region sealed off from fluid to be investigated, and having a logic unit with at least one microcontroller which is configured to process measurement data recorded over an evaluation period, wherein the metrological device is configured to correlate at least one measurement value with at least one (organic / inorganic) process parameter, P SB, based on the processed measurement data, in particular with a process parameter for the chemical / biological oxygen demand (COD / BOD) and / or for a carbon consumption rate and / or for substance fractions of volatile fatty acids, In particular, of an (ab) water treatment process or energy acquisition process to be optimized; according to the invention, it is proposed that the measurement device has at least one ceramic, in particular silicate ceramic, in particular clay ceramic (in particular terracotta), which is arranged and effective between the cathodic region and the fluid to be examined, as a constituent of the measurement-technology microbial unit and separates the cathodic region from the fluid to be examined, wherein the measurement device is configured by means of the at least one ceramic for generating the at least one energy / electrochemical (cell) parameter from measurement data relating to the fluid to be examined, which measurement data is recorded over an (unaffected) evaluation period of at least 30 days due to the system, in particular measurement data from cell-internal resistance components and / or voltage, capacitance, current, power and / or electrical charge measurement data. This provides a measurement technology concept that can be used comparatively widely, based on comparatively cost-effective components, with a comparatively fast measurement technology reaction time, with particularly good or variable correlation possibilities between individual measurement data or parameters. For example, (ab) water analysis in a process phase before / before water treatment is to be regarded as an interesting field of application for implementing the present invention. Advantageously, silicate ceramic is selected as the ceramic, for example terracotta or clay ceramic, in particular with the properties described in more detail here, in particular with regard to porosity, in particular depending on a respectively selected (radial) thickness, in particular depending on an optionally predefinable silicate content (SiO 2).If, according to the present disclosure, reference is made to a metrological microbial electrochemical technology unit, MET, this is taken to mean synonymous in the context of the present invention an MBZ or a correspondingly metrological arrangement, optionally with or without a microbial electrolysis cell (MEZ). In other words, the measurement concept described here can be combined with an analysis based on MEZ. According to the invention, however, the implementation of a MEZ is not necessary, so that it is also possible to dispense with the application of a potential (or an additional voltage), as a result of which the system accuracy and the usability even at measurement points which are difficult to access can be improved.If process parameters, P SB, are referred to according to the present disclosure, depending on the sensory context, this is also synonymous to a parameter in general, i.e. a correlation does not necessarily have to take place in the context of a process to be controlled / regulated (e.g. in the case of ground sensor systems), although this may represent the manner of implementation that is primarily of interest according to the invention.It has been found within the scope of the present invention that the device design described here facilitates or only enables the data generation and data evaluation steps based thereon, in particular during long-term measurements or long-term analysis over several weeks: the long-term stability of the MET achieved according to the invention enables, in particular in the field of water analysis, preferably modulation-based, in particular pulse modulation-based, generation of electrochemical parameters which are significantly influenced by the (ab) water matrix and are not disturbed or not significantly disturbed by salt deposits on the cathode. The long-term stability ensured according to the invention also enables the method described here of data evaluation from the same general entity; in addition, a larger, as unaffected as possible data set can be evaluated, as a result of which the quality of the generated parameters or of the COD and / or BOD data (or corresponding estimates) can be significantly improved. In this case, the modulation analysis described here, in particular pulse modulation analysis, also advantageously delivers evaluable input variables for at least one ML algorithm (machine learning algorithms), for example for an ANN (artificial neural network), as a result of which the load capacity of the analytics can be further improved. For example, the electrochemical parameters determined allow isolation of signal interferences (which is / was usually not possible up to now with the sole measurement of the current density). In addition, complex non-linear relationships can be identified and evaluated or at least taken into account by ML algorithms or AI models resulting therefrom, in particular also with regard to a better data quality thanks to high long-term stability in the context of the acquisition of the measurement data.It is to be understood that the analytics described here can be seen in general with reference to process parameters for the chemical / biological oxygen demand (COD / BOD), in particular since BOD and COD are expected to stand with one another in a comparably unambiguously concreteable context, in particular conversion correlation about factor 2 for most applications (and also the BOD5, BOD10-,..., BOD21 values, which stand for a measurement value decrease from five, ten,..., 21 days of analysis). In particular, it is to be understood that a rather specific correlation (BOD) has hitherto been less defective than a rather general correlation (COD), especially since the total COD also comprises inert fractions, i.e. non-biodegradable soluble and non-soluble fractions (i.e. non-biodegradable but soluble fractions and particulate fractions), which, to a more extent, do not interest more in particular within the scope of process-related improvement measures. The present invention enables a comparatively fast slender measurement and analysis already after a short time, with the understanding, for example the BOD5 which has been used conventionally up to now, to be made available already after a significantly shorter time than five days (in this respect, analogously based on the present invention, it could also be referred to, for example, as a "BOD3" or "BOD2"). The same applies to the correlation of volatile fatty acid material fractions (VFAs) and / or the carbon consumption rate (CCR) described here, as described in more detail further below. In this respect, the present invention also provides an analytical concept which can be advantageously implemented on a broad basis, by means of which prior measurement measures with regard to numerous parameters and applications can be considerably simplified and can also be improved in terms of accuracy.The present invention can also be described in the following context: Microbial fuel cells (MBZs) represent an innovative biotechnology, with the aid of which the chemical energy contained in the wastewater (in particular over a range from 1.5 to 3.5 kWh / m 3) can be converted into electrical energy. The main agents for this are anaerobic microorganisms, so-called electrochemically active bacteria. This process is initiated in particular on the biologically active biofilm of the anode of the MBZ, on which bacteria of this particular bacteria group oxidize organic compounds to CO2, protons and electrons. The released electrons are transferred to the anode via intra- and extracellular transport mechanisms (terminal electron acceptor). Driven by a potential gradient, the electrons spontaneously migrate via an external circuit to the cathode, where they are reduced to water together with protons and oxygen. MBZs can be used in this context as biosensors, in particular based on the conversion of biological system responses into measurable signals, which can be used as a bioindicative basis for organic and inorganic substances. Usually, MBZ-based biosensors correlate the generated electric current signal (or the power density) with the current concentration of organic water constituents, but neglect signal interferences relevant to performance. These include, inter alia, environmental factors such as the electrical conductivity, the temperature, toxic substances, the pH value, but also performance-limiting factors such as, for example, the so-called scaling (deposits, in particular comparatively hard mineral deposits such as, for example, CaCO3on components of the MBZs which are relevant to measurement technology, with a gradual loss of the measurement technology capabilities or possibilities). These factors can each also have a decisive influence on the measurement accuracy and sensitivity of the biosensor. The present invention makes it possible to overcome numerous disadvantages known from the prior art, with advantageously comparatively simple measures relating to the technical apparatus of the sensor system. Within the scope of the present invention, it was also possible, in particular on the basis of the measurement and data properties ensured by improved long-term stability, to develop equivalent electrical circuit models which can be used for isolation of the signal interferences addressed, it having been shown that the model parameters (corresponding to internal cell parameters) can advantageously be determined by modulated, in particular pulse-modulated, isolation, especially also pulse-width-modulated isolation and connection of the external electrical load resistor. The analysis of the cell parameters could sufficiently show that they can be correlated in particular with the composition of the anolyte (wastewater). For example, a marked relationship between the electrical conductivity and the ohmic resistance of the microbial MBZ or MET system could be demonstrated. In particular, in comparison with a single interference-superimposed measurement of the electric current, the method described here of analyzing the individual cell parameters improves the sensitivity, reduces the response time and reduces the number of false reports, in particular over a measurement period of at least a few weeks or months (e.g. with daily acquisition of measurement data). It has been shown here that, in contrast to a simple linear correlation, the partially complex relationships, in particular with respect to the comparatively general COD or (already somewhat specific) BOD process parameters, can be mapped comparatively accurately or meaningfully, that is to say comparatively complex nonlinear relationships between MBZ-specific parameters and target variables (COD, BOD5, etc.), in particular also by the evaluation / analysis being implemented in a continuing manner by means of artificial neural networks (ANNs). For example, the use of ANNs can be successfully used to determine the concentration and type of substrate used from the substrate-specific voltage profile of an MBZ within a batch cycle (substrate exchange / addition in laboratory operation for the most standardized possible experimental conditions). The present invention also makes it possible to reduce the measurement reaction time considerably, in particular to below one minute, so that, in long-term observation (several weeks / months / year), it is possible to achieve virtually real-time measurement of quality parameters which have previously been very cost-intensive, laboratory-intensive, personnel-intensive and time-intensive (in particular in the context of COD, BOD5, etc.), in particular also in the field of (ab)water analysis / treatment. In this context, within the scope of the present invention, in particular the microbial MBZ technology relating to apparatus technology and the evaluation of measurement data, advantageously comprising modulation (in particular pulse modulation, especially pulse width modulation) and soft sensor system consisting of at least one equivalent electrical circuit model and ANN, are fused in a novel manner, on the one hand for (apparatus-related) provision of a measurement apparatus which is stable over a long term and is advantageously also at least largely independent in terms of energy, and on the other hand for generating and evaluating measurement data of high quality, in particular also with regard to a process control / regulation process which is driven by sensor data on the part of a user or operator of the installation. The apparatus construction described here enables a particularly cost-effective (low cost) and low-maintenance reactor configuration which is stable over a long period of measurement, and also promotes redundant implementation for numerous measurement points / locations or enables it at all (grid, swarm, network), as a result of which the measurement reliability or load capacity of the analysis can be further increased, whether for each measurement point, be it over a comparatively large area to be measured or a large volume to be measured.The measurement device can also include a temperature sensor system (e.g., also implemented as integrated temperature compensation, in particular within the scope of a conductivity measurement), by means of which the temperature of the fluid to be examined can be detected, wherein the correlation of the measured value (relating to the voltage, conductivity or the like) and process parameters (in particular COD / BOD) can be realized as a function of temperature. An accuracy of, for example, 0.1° C. can be considered sufficient, in particular with regard to the doubling of the temperature-dependent activity of microorganisms per 10° temperature increase (van't Hoff-Arrhenius equation), which is to be assumed as a guide value.It is to be understood that the metrology concept of the present invention may also be described as being based on three aspects:biosensor or microbial electrochemical technology unit (MET);microelectronics (in particular with mosfets or field effect transistors) for generating a voltage profile based on modulation, in particular pulse modulation, especially also pulse width modulation of the external electrical load resistor;data evaluation by processing electrochemical parameters by means of a microcontroller;The generated voltage profile can be evaluated in particular via a parameter determination routine, derived from a mathematical model (first soft sensor system or equivalent electrical circuit). The parameters of the model can correspond to electrochemical parameters(s). The control of the microelectronics and the parameter determination routine can be implemented on a / the microcontroller. The subsequent data evaluation or data evaluation based thereon is preferably carried out by means of a second soft sensor system, in particular comprising machine learning, e.g. a neural network, in particular since complex non-linear relationships between the target variable or variables (COD, BOD, etc.) and the electrochemical parameters have to be taken into account. The sought target variable can be output as an output in the context of the data evaluation.It is to be understood that the inventive measurement technology and data analysis technology can also be advantageously implemented in particular in the following context: i) measurement devices for process optimization in (ab) water treatment processes and energy extraction processes; ii) measurement devices configured to generate energy and / or electrochemical parameters based on modulation, in particular based on modulation of the electrical load resistance; iii) Metrological devices comprising at least one microbial electrochemical measuring device, configured for at least one metrological application from the following group: measurement technology for wastewater streams, industrial wastewaters (e.g. from the paper / meat / confectionery industry), process water, grey water, black water, yellow water, percolating water, medical wastewaters, agriculture, soils, plant sewage treatment plants, landfills, water / water bodies in general, drinking water, groundwater, treatment of precipitation water, substrates, digestion towers (in particular anaerobic digestion); IV) Metrological devices comprising at least one microbial electrochemical measuring device configured for metrological detection of substances when determining water quality parameters, for example when determining at least one of the following parameters: COD, BOD5, nitrogen, nitrogen compounds, phosphorus, phosphorus compounds (in particular orthophosphates), dissolved oxygen, volatile organic acids; v) Metrological devices comprising at least one microbial electrochemical measuring device configured as early warning measuring devices in particular with respect to toxic substances such as heavy metals, nitrates, antibiotics; vi) Energy-autonomous measuring devices comprising at least one microbial electrochemical measuring device; vii) Metrological devices comprising at least one microbial electrochemical measuring device configured for detecting at least one photosynthetic parameter in particular in / of trees.In this case, the corresponding measurement device can optionally comprise both firmware and soft sensor systems, that is to say all those components which are used for generating the desired measurement variables. In particular, thanks to the inventive concept that is cost-effective and energy-autonomous, both firmware and soft sensor systems can be integrated in the respective sensor or at the respective measurement point. This also allows application-specific adaptation of the measurement technology in a very specific manner. Accordingly, for each measurement point, e.g. the (bio)chemical oxygen requirement can be made directly visible (e.g. based on the predefined dependence 1 mA=7.2 mgCO / d, compare in this respect also the dependence on the Faraday constant: one (1) electron equivalent corresponding to eight (8) grams of COD), and in this case no toxic chemicals are required (in particular no potassium dichromate) for the construction by measurement technology.The measurement technology concept according to the invention also makes it possible to detect further substances (in particular in the sense of wastewater quality parameters), for example parameters relating to COD, BOD5, nitrogen, nitrogen compounds, phosphorus, phosphorus compounds, dissolved oxygen, volatile organic acids. Furthermore, in particular thanks to the measurement principle based on living microorganisms, an implementation as an early warning system or warning device can be implemented in a simple manner (e.g. with regard to toxic substances, e.g. heavy metals, nitrates, antibiotics). The implementation that can be realized with energy consumption also enables an energy-independent measurement technique (per measurement point), which can also be used in areas that can be established only with difficulty or in so-called "remote zones". An implementation for detecting or evaluating photosynthetic processes can also be realized, for example in connection with monitoring the (health) state of particularly valuable plants or trees.It is to be understood that "ceramic" is to be understood here in the sense of a technical ceramic having an open pore-like structure and conceptually excludes glazed stoneware. The present invention is based on the concept of allowing an exchange or a diffusion by means of the (technical) ceramic and, if appropriate, also to a certain extent a harmless deposit or the like effect which does not influence the long-term stability. According to one embodiment, the ceramic is formed by silicate ceramic, in particular clay ceramic or terracotta, or comprises at least one silicate ceramic, in particular clay ceramic.The ceramic is advantageously designed as a silicate ceramic, optionally further formulated by at least one additive, for example activated carbon, pyrolyzed rice hulls advantageously having a high SiO2content, zirconium. It has been found that, by means of silicate ceramic in the context of application described here, in particular the following advantageous effects can be ensured:Even more effective reduction of membrane biofouling (further increase of long-term stability);enhanced proton diffusion, enhanced proton mass transfer coefficient;improving the water retention thanks to hygroscopic oxide such as SiO2;improved proton conductivity thanks to formation of bound water within the membrane;For example, SiO2can be mixed or added to the ceramic in particulate form. This also allows the hydrophilicity to be improved / enhanced. Deposits or contaminations on the membrane surface can then be more easily dissolved or can more easily be detached again.The SiO2content may be considerable. For some applications it may be advantageous to choose the SiO2content to be significantly more than 50%, optionally even more than 70% (weight percent). This can also contribute to good performance characteristics.In terms of metrology, it is also to be understood that the so-called carbon consumption rate (CCR) can be detected or evaluated by means of the metrology device described here in a comparatively simple manner and with good data quality (simple conversion factor) and can therefore also be provided in the form of evaluated data, for example in the context of a plausibility test and / or with regard to easier data analysis / use by users or using devices (e.g. water treatment companies). In particular, in the context of the detection of the carbon consumption rate, a calibration can also be carried out in a comparatively simple manner or may also become completely unnecessary (in particular the measurement of the activity of microorganisms may be / will be implemented in a sufficiently precise manner without a specific manner of calibration). The carbon consumption rate can also be evaluated as an indicator for the COD (or as a variable in the context of the determination of the COD), wherein substrate limitations can also be shown, wherein a (health) state of the bacteria involved can also be estimated. Thus, the data analysis can be further improved by referring to the carbon consumption rate.It is also to be understood that the substance fraction volatile fatty acids (VFA) can be detected comparatively easily by means of the measurement device described here, as a result of which further findings with regard to the biological processes which take place and anaerobic digestion can be obtained.Thus, by reference to the three process parameter groups for COD / BOD, carbon consumption rate, volatile fatty acids explicitly mentioned here, it is shown in which context the measurement technology described here can be implemented, whether it is specific in each case for only one of these groups, whether it is in combination of two or all three of these groups (in particular including outputting a correlation among these three groups or these three groups among one another).A cathodic region is understood here to mean, in particular, the cathode as such (catholyte layer, catalyst layer) in conjunction with a current collector, optionally also in combination with a gas diffusion layer (air cathode), but advantageously only two-layer, that is to say without a gas diffusion layer. A gas diffusion layer (e.g. made of PTFE) enables a targeted influence on the oxygen transfer. However, the ceramic is advantageously already designed functionally in such a way that the (oxygen) diffusion can be set in an optimized manner even without an additional gas diffusion layer, in particular even with good long-term stability. In this respect, the configuration according to the invention also makes it possible to dispense with an additional gas diffusion layer.It is to be understood that the cathodic region has access to the air atmosphere, e.g. realized by means of a cover protecting against environmental influences, or that a technical (active) aeration or O2feed is implemented (oxygen reduction reaction O2+4e-+4H + →2H2O). In this respect, the terminology "sealed off" in the context of the cathodic region is to be understood as being narrow with respect to the fluid to be investigated, in particular since the cathodic region can also be flooded with catholyte (accumulation). However, it should also be added to this that the measurement technique described in the present case can also be operated inversely with respect to the anode / cathode function from the measurement principle, i.e. the MET described in the present case can optionally also be implemented for determining the O2content, for example in the case of a redundant arrangement of a plurality of MBZs in local proximity, with mutual checking and measurement addition.Personalised terms, unless formulated in the neutroleum here, can relate to all sexes within the scope of the present disclosure. Any foreign language terms or abbreviations used herein are each technical term in the industry and are familiar to those skilled in the art in the appropriate language. Any ambiguous terms or abbreviations used / usable interchangeably herein may be given redundantly for completeness, or vice versa, for example with respect to the term chemical oxygen demand, COD (chemical oxygen demand), or with respect to the term carbon consumption rate (CCR).According to an embodiment, the ceramic defines at least one membrane component of the metrological microbial electrochemical technology unit. This also facilitates a device implementation in which a bridge or partition or barrier between the cathodic region / compartment and the fluid to be examined is provided by means of the ceramic, in particular in the manner of a separator function.In this case, with reference to the present invention, the membrane or membrane component is to be understood as meaning, in particular, that component which is incorporated between the electrodes of a / the membrane-electrode assembly of the MET in terms of device technology and which ensures a separation of anode and cathode or anodic region and cathodic compartment, that is to say not necessarily only a membrane component in the narrower sense, but also, in terms of function, that component(s) which normally functions as a separator or is / are provided according to the invention in an MBZ or in the MET described here.According to one exemplary embodiment, the ceramic is a component of a membrane electrode assembly of the at least one metrological microbial electrochemical technology unit, in particular in the manner of a full-surface intermediate layer or bridge between an anodic compartment / section / region (e.g. a wastewater basin) and a / the cathodic compartment defined by the membrane electrode assembly. Such an in particular cylindrical enclosure of the cathodic compartment by the ceramic can also ensure a particularly good effect of the ceramic, with comparatively low outlay on apparatus.According to one embodiment of the present invention, a membrane electrode assembly is understood to be, in particular, a ceramic electrode assembly.According to one exemplary embodiment, the at least one ceramic together with the electrodes (anode, cathode) in full-circumferential surface-area contact, preferably radially prestressed by tensile / compressive force, forms a / the preferably three-component membrane-electrode assembly of the metrological microbial electrochemical technology unit, MET. This also provides a comparatively simple and cost-effective and long-lived construction of one of the most important, if not the most important, modules of the MET.For example, the membrane electrode assembly or the entire metrology device is designed in a total height of 20-30 cm, for an intended immersion depth of, for example, 10 cm.With regard to a preparation of the ceramic which is particularly advantageous in the context of the present invention, in particular with regard to long-term stability and cost, it is to be understood that in particular the radial thickness and the porosity of the ceramic are to be used as effective physical design variables, in particular for the purpose of ensuring good long-term stability and minimal drifts, and also for the purpose of optimizing the performance of the MET, in particular with regard to the following properties: i) permeability for gaseous atmospheric oxygen; ii) ohmic resistance; iii) ionic conductivity; iv) mechanical stability;In this case, the thickness can in particular also be predefined as a function of the porosity, or vice versa. In particular, if the O2diffusions are too strong because of the permeability being too high, there may be a risk that an aerobic environment condition may be established in the anodic biofilm, which inhibits the anaerobic exoelectrogenic bacteria. In other words, oxygen can inhibit the activity of exoelectrogenic microorganisms, with the effect of lowering the bioenergy yield, in particular with the risk of aerobic bacteria overgrowing the exoelectrogenic bacteria. If, on the other hand, the ceramic is selected to be too thick or the porosity is selected to be too low, the ohmic resistance increases, with the effect that the biocurrent production decreases.The ionic conductivity can be predetermined in particular by the particle size and the type of clay used.The mechanical stability is to be defined in a highly application-specific and application-specific manner: the ceramic should not be too thin, in particular not thinner than 2 mm, preferably not thinner than 3 mm. An upper limit for the thickness may be 20 mm, preferably even only 10 mm, depending on the application.The porosity is advantageously in the range from about 10 to 35%, preferably 20 to 30%. For example, a radial thickness in the range from 6 mm to 9 mm provides a good compromise, in particular with regard to good power density.Thus, for example, a (radial) ceramic thickness between the electrodes in the range from 5 to 10 mm, in particular in combination with a porosity in the range from about 23% to 30%, can ensure an advantageous compromise, in particular between oxygen permeability, ohmic resistance, ionic conductivity and mechanical stability, with good or maximized bioenergy production. The skilled person can further optimize the application-specific optimizable material properties on the basis of the present disclosure, in particular by selecting the type of clay used and optionally also adding additives.With regard to a relationship between porosity and (radial) thickness, it is also to be understood that an application-specific predefinable dependence of these physical-structural parameters with respect to one another can also be influenced by material-specific (material) material concentrations. In other words: in addition to these physical parameters, at least one chemical material parameter can also be / become noteworthy for the respectively desired mode of operation / functionality, in particular in the context of subdivision into silicate ceramics, oxide ceramics, non-oxide ceramics, or in the context of delimiting the ceramics described here from oxide ceramics and non-oxide ceramics. It has been found that it is advantageous to take into account the silicate (SiO 2)- content and advantageously also to specify it in such a way that the ceramic is a silicate ceramic or comprises at least one silicate ceramic, in particular silicate ceramic with SiO2as main constituent >70% and optionally constituents such as, for example, aluminum and the like. Optionally, the ceramic may comprise zirconium at least as an additive. Based on the present disclosure, the person skilled in the art understands which characteristic the ceramic should advantageously have with regard to separator function, mechanical stability and long-term stability, so that the person skilled in the art can also find further variants of the ceramic on the basis thereof, for example comprising or based on ZrO2 ceramic constituents.Furthermore, it is to be understood that good flat contact between the electrodes (in particular the cathode) and the ceramic is decisive for the power yield that can be achieved. A dimensional tolerance of the ceramic is preferably defined to be significantly less than 2 mm, advantageously at most ±1.5 mm. Dimensional tolerances of the electrodes can be even more accurate / smaller. Advantageously, the use of hydrogels is provided, in particular for the purpose of compensating any dimensional tolerances on the part of the ceramic, for the purpose of optimizing the planar contacting between the ceramic membrane component and the electrodes (in particular the cathode), with the effect of higher current yields. Also, by means of hydrogels in the manner of a positive side effect, moisturizing of the cathode, if necessary or at least expedient in a specific application, can be facilitated, so that households with respect to catholyte are simplified (advantageously hydrated cathode, advantageously minimized evaporation). An amount of only a few grams of hydrogel may already be able to store up to 1 liter of water. For example, at 10 mL / d catholyte, about 3 g of hydrogel may be sufficient to bind the catholyte formed over a period of about 100 days. This measure can accordingly also be conducive in the context of the goal of high long-term stability. Not least, the use of hydrogel, e.g. in granular form, may also alleviate the energy requirements and facilitate the implementation of an energy autarchy over the longest possible period of time (e.g. thanks to the omission of pump technology or energy consumption by pumping-off measures). It is to be understood that the catholyte volume should be biocurrent-dependent for most applications, i.e. in the case of high biocurrent production, a relatively high catholyte quantity is also to be expected. Since the biocurrent production can also depend on or can therefore fluctuate with the instantaneous composition of the fluid to be examined, it may be expedient for certain applications to make additional measures for optimizing the catholyte balance or the moisture conditions for the cathode, in particular the use of hydrogel. For example, hydrogel is provided in layers or as at least one layer (e.g. applied in powder form), in particular between a corresponding electrode and the ceramic, and optionally also on the inner side of the cathode.It is thus clear that a design of the measurement device, which is particularly advantageous in particular with regard to long-term stability and cost, starting from the selected configuration of the ceramic with a configuration of the electrodes matched thereto, can lead to a membrane-electrode assembly which can be optimized in an application-specific manner and in which, for example, an optimization of the measurement-technology reaction time is implemented in an application-specific manner (in particular thanks to the smallest possible anode), and / or a configuration which is particularly effective in terms of cost, in particular taking into account the configuration of the cathode. The thickness of the cathode is, for example, about 0.5 mm, but can also be dependent on the number of active centers usable for the oxygen reduction reaction in a manner specific to the application.It is to be understood that, depending on the type of implementation, it may be advantageous to leave a certain amount of catholyte (accumulation) in the measurement system, in particular in order to be able to prevent an optionally inhibiting effect of excessively high oxygen concentrations. This can also be ensured, for example, in a constructive manner, for example, by a comparatively long narrow cylinder geometry. In particular, implementations in which the dissolved oxygen already has a sufficiently high concentration in order to be able to ensure the operation of the MBZ (8 to 9 mg / L in the liquid phase) can also be realized. The selected thickness of the anode can also contribute to the oxygen concentration equilibrium, in particular with regard to the concentration range which can be predefined for the desired speed of the diffusive substrate transport or with regard to the thickness of the biofilm which forms during operation.It is also to be understood that the membrane electrode assembly of the MET described here can be advantageously implemented, in particular in the context of the following material selection: anode material consisting of or at least comprising carbon-based veil or carbon veil (analogously: CFRP mat) or graphite felt or activated carbon fiber felt, ceramic membrane (component) or ceramic separator, cathode material comprising an activated carbon mixture as catalyst, advantageously in combination with an (Edel) steel fabric for a current collector function. Advantageously, the membrane electrode assembly comprises an activated carbon fiber felt for at least one of the electrodes. It has been found that activated carbon fiber felt can be provided or used in a stable form as carbon veil. The anode can also be formed, for example, by a multilayer carbon / carbon screen, wherein the anode thickness is / remains adaptable in a manner specific to the application.Advantageously, the material selection for the electrodes of the membrane electrode assembly described here is / is made from materials from the following group: carbon-based veil, graphite felt, activated carbon fiber felt (anode) and / or activated carbon mixture, activated carbon fiber felt, activated carbon-based activated carbon (cathode).The present invention is also based on the finding that when selecting the anode material, a large surface area and porosity in combination with good electrical conductivity, biocompatibility and longevity and stability are to be ensured as prevailing properties. It has been found in the context of the present invention that carbon-based veil or carbon veil or graphite felt provides a good compromise between performance yield and outlay on apparatus (in particular also with great cost-related advantages). In this case, a predefined bending radius or a tolerance specification relating thereto can also be advantageous, in particular with regard to the use of round bent stainless steel fabric / grid for a current collector function in combination with at least one of the electrodes. Starting from planar electrodes / stainless steel fabrics, a cylindrical geometry can also be achieved, in particular by bending, for the production of the ceramic or a ceramic cylinder base body. By presetting a bending radius, an optimum fit can be predefined (in particular of a stainless steel fabric), which also facilitates assembly and can optimize the mode of operation.The present invention is also based on the finding that good catalytic properties, a high surface area and high electrical conductivity are to be ensured as predominant properties in the selection of the cathode material. The cathodes described here (or the corresponding cathodic region) advantageously consist of two layers, optionally also of three layers: catalyst layer, current collector (layer) and, in the case of an air cathode, an additional gas diffusion layer. The cathodes described here can also be / are designed to be comparatively thin, in particular with regard to good cost-benefit considerations, in particular depending on the number of active centers usable for the oxygen reduction reaction. The configuration of a current collector, in particular with metal fabric, is also advantageously adapted in an application-specific manner, for example by virtue of the wire thickness, bending radius, metal material composition and similar boundary conditions being predefined. The current collector may be incorporated into the electrode (to provide an integral-integral configuration).It is understood that bacteria and enzymes belong to the biotic catalysts, while the abiotic catalysts may be classified as platinum group metal (PGM) catalysts, platinum group metal free (PGM) catalysts, and carbonaceous materials. These catalysts can be used on carbonaceous or metallic current collectors and can have, for example, the same material properties that are advantageous for the anode material. It has been found within the scope of the present invention that activated carbon or the carbonaceous material appropriately formulated for the electrodes described here can be used as an advantageous catalyst in the MET described here, in particular since activated carbon is ORR-active (oxygen reduction reaction ORR), has a large surface area and can be provided or formulated at comparatively low costs. However, up to now, when using activated carbon, the prior art user has been faced with very rapid performance waste, especially in heavily contaminated wastewaters, in particular due to salt accumulations (or mineral deposits, fouling) and biofilm formation (relatively soft deposits, fouling) on the catalyst and a / the gas diffusion layer. The present invention overcomes this disadvantage, in particular also based on a catalyst (or catalyst layer) consisting of or at least comprising an activated carbon-graphite conductive carbon mixture, further preferably with a metal mesh as current collector. The catalyst layer contacts the inner surface or inner side of the ceramic separator as fully as possible over the entire surface. The activated carbon material base can also be used as anode or for the anode. The metal mesh of the current collector can have, for example, a mesh width in the range from 0.1 mm to 0.5 mm, and / or a wire thickness of less than or equal to 0.5 mm. This also facilitates an advantageous deformability, in particular bending / rolling ability, for the purpose of obtaining a cylindrical geometry. For example, the electrode material consists of (comparatively stiff) stainless steel V4A and has a mesh width in the range of 0.1 mm and / or a wire thickness in the range of 0.15 mm. For example, the metal fabric is incorporated into the electrode material, or vice versa, for example by forming and / or embedding. In this respect, an application-specific configuration can also be carried out in the context of the permeability and formulation requirements.It is also to be understood that the configuration of a / the membrane electrode assembly in the manner of a structure according to anode (external) separator / membrane component cathode (internal) is to be classified in the following context and, owing to optimization in terms of apparatus technology according to the invention, contributes too much to the long-term stable MET described here for collecting measurement data of high quality over a long period of time. Microbial MBZs can be divided into two basic designs: single chamber MBZs in which both electrodes are located in the same working chamber and two chamber MBZs in which anode and cathode are located in a separate working chamber. The anode and cathode chambers in two-chamber MBZs are often physically separated from each other by a selective membrane (or separator), which is intended to reduce substrate losses and maintain anaerobic conditions in the anode chamber. Furthermore, MBZs rely largely on ion exchange between anode and cathode because it represents the primary driving force for the external circulation electrons. A separator accordingly functionally represents an important intermediate phase for the ion flow, which is triggered by the electro-osmotic effect of the electric field of the MBZ. An anode-cathode arrangement that is as compact as possible can reduce the overall dimensions, reduce the internal resistance and improve the performance of the MBZ. However, cathode exchange membranes (CEM) typically used as separator / membrane are comparatively cost-intensive (up to 60% of the material costs of the MBZ) and, unfortunately, remain very susceptible to biofouling and scaling effects. Likewise, the air cathode also usually suffers from biofouling and scaling. It has been found in the context of the present invention that the design in terms of apparatus of the anode-separator / membrane component-cathode assembly described here can ensure good "production" of catholyte, in particular in the case of further optimization based on moisture control, taking into account effects by electro-osmotic suction, which is also of importance with regard to washing off deposits from the cathode surface and production of antimicrobial active ingredients. Liquid catholyte contributes to good longevity and to the prevention of biofouling, scaling and possible blocking of the cathode. Moisturizing of the cathode by catholyte formed is advantageously ensured in a continuous manner, for preventing drying out and for transporting away salts, and for preventing biofouling at the air cathode (in particular thanks to the antimicrobial property of the catholyte).In particular with regard to optimum operating conditions, it is to be understood that moisturizing the interior of ceramic and cathode ensures, on the one hand, an advantageous water balance with respect to the cathode (H+ions for oxygen reduction reaction, O2+e -+ H + → H2O), and, on the other hand, can optimize the process of transporting away salt, in order to effectively avoid unwanted mineral precipitates. Stoichiometrically and charge-balanced, the reaction is: O2+4H ++ 4 e - ->2H2O In this case, catholyte formed has antibacterial properties (high pH, in some cases >10, high conductivity), which can also effectively prevent the formation of a biofilm on the cathode, which in turn can improve long-term stability. Therefore, moisturizing the cathode by catholyte formed provides advantageous long-term operating conditions. Constant moisturizing is not necessarily required here, but can be promoted or even ensured in a constructive manner and / or the operation-related formation of catholyte, optionally supported by additional measures such as moisture storage (see the measures mentioned here with respect to hydrogels). The configuration according to the invention can accordingly also ensure that the catholyte formed provides the oxygen in dissolved form, with the result that comparatively little oxygen can reach the anode (in comparison with atmospheric oxygen conditions), with the result that an anaerobic environment can also be maintained in the anodic biofilm.Further studies on the present invention have also revealed that a comparatively soft, flexible electrode material formulation, advantageously also hydrophilic formulation, in particular in the form of a felt, leads to comparatively good results. In particular, it can preferably be ensured by means of felt electrodes (both on anode and on cathode) that a particularly extensive flat contact with the corresponding ceramic separator shell surface is / is created. Such a comparatively soft, flexible electrode material preparation, in particular felt preparation, provides comparatively good contacting properties even in a moist medium. The structural design relating to the device can also be further simplified on the basis of at least one electrode of this type. Not least, even more noticeable cost advantages can be realized.According to one exemplary embodiment, the ceramic also defines, at least partially, a / the reactor body (chassis) of the metrological microbial electrochemical technology unit. This can also simplify the structural design further and provide a particularly robust and dense structure, with good stability even if the ceramic is designed to be comparatively thin. The configuration of at least parts of the chassis made of ceramic may also contribute to the situation in which the moisture balance in the region of the cathode can be optimized. It is to be understood that a planar-planar configuration of the ceramic can also be realized, but entails disadvantages in comparison with a cylindrical configuration, such as, for example, sealing / connecting at angled sections. At least in this respect, the cylindrical configuration should be considered to be more advantageous. It is also to be understood that a chassis does not necessarily have to be present, i.e. the ceramic can also only substantially form the membrane(s). Nevertheless, embodiments are possible in which the ceramic forms not only the membrane(s) in the manner of a pot or blind hole, but also a base region on which, however, a membrane function is not necessarily fulfilled. Thus, the ceramic can also form or provide a type of chassis or rather purely structural component. The chassis / chassis or at least parts of a / the chassis do not necessarily have to be made of ceramic, but chemical / biological stability of ceramic also provides good advantages in the context of a / the chassis, in particular in the case of long-term use.According to one exemplary embodiment, the ceramic defines at least one component effective between cathodic and anodic regions or a corresponding component of a / the membrane electrode assembly of the metrological microbial electrochemical technology unit. This also facilitates the desired device-technology planar implementation of the ceramic between the fluid to be examined and the cathodic region / compartment.According to one exemplary embodiment, the material properties of the (clay) ceramic are defined at least with regard to porosity, in particular in a range from 23% to 30%, and optionally also with regard to material thickness (thickness, in particular radial thickness), e.g. 7 mm or 8 mm. The porosity can be considered a particularly relevant parameter of the ceramic, in particular also with regard to stable long-term operating conditions. Based on the present disclosure, the person skilled in the art can also define porosity ranges in an application-specific manner, optionally also as a function of the ceramic material thickness. In this case, further preparation specifications can also be specified or tolerance specifications can be specified, for example with respect to a cylindrical roundness.For example, the porosity of the ceramic membrane is in the range from 21% to 25%, in particular the open porosity determined by means of a water absorption method. For example, the water absorption of the ceramic is in the range from 11% to 13%.According to one exemplary embodiment, the ceramic is unglassed. This can ensure advantageous metrological properties, in particular in the context of the mode of operation of MET, and can particularly effectively prevent a potentially occurring scaling effect known from the prior art.According to one exemplary embodiment, the at least one ceramic is arranged between anode and cathode of a / the membrane electrode assembly of the at least one metrological microbial electrochemical technology unit in a geometrically at least approximately cylindrical structure, for example in a full surface contact (in particular mechanically prestressed) both on cathode and on anode. This not least also provides a particularly simple, robust and also tight structural engineering construction, wherein the ceramic can also at least partially form a / the chassis (reactor body) of the MET. The large-area contacting also facilitates a complete replacement of material or materials that are quite costly according to the prior art by the ceramic described here, in particular also with regard to electrode material.It is to be understood that the measurement device makes do without a spatially predefined measurement-effective region for at least temporary recording or for conducting fluid to be examined. In other words: the measurement device does not necessarily have to define a compartment for the fluid to be examined, but can be immersed, for example, in the water / wastewater / water body (fluid) to be examined, and the fluid to be examined is present from the outside around the anodic compartment (or is present in an anodic region), optionally with a reversed / reversible measurement principle. If the fluid to be examined is located in a predefined vessel, basin, pipe or the like or flows through it, it is indeed also possible to speak of a spatially predefined anodic compartment, otherwise rather only of an anodic region or anodic section. Alternatively, an anodic compartment can also be formed insofar as the ceramic is surrounded at a radial distance by a type of grid or similar protective envelope, e.g. in order to keep hard objects (e.g. branches or similar grain, in particular when used in flowing waters) from contacting the anode or its possible enclosure. In this context, too, it is noteworthy that the measurement principle described here can also be operated or used in reverse, i.e. the MET described in the present case can optionally also be implemented for determining the O2content.According to an embodiment, the electrodes of a / the membrane electrode assembly of the at least one metrological microbial electrochemical technology unit comprise at least one of the following materials: carbon-based carbon fiber fleece / veil, graphite felt, activated carbon fiber felt, in each case for the anode, and / or activated carbon-graphite conductive carbon mixture, activated carbon fiber felt, graphite felt, granulated activated carbon, in each case for the cathode. It is to be understood that conductive carbon black is also referred to as carbon black in the technical literature, which is predominantly English.Advantageously, at least one of the electrodes has a soft, flexible formulation, advantageously also a hydrophilic formulation. This also promotes an advantageously constant long-term behavior of the membrane electrode assembly, in particular with regard to the current consumption or current transfer characteristic.In this case, a current collector (e.g. stainless steel woven fabric or carbon fiber nonwoven fabric) and / or optionally also a gas diffusion layer (e.g. PTFE) can optionally be / are provided for the cathode.Based on the present disclosure, the skilled person can recognize in an application-specific manner, to what extent or whether the respective electrode should advantageously have a specific formulation and / or can be optimized in an application-specific manner by adding additives. In particular for cathode design, it is advantageous to rely on "blanks" available on the market and to further develop these on an application-specific basis, in particular with regard to the assembly described here comprising the ceramic separator or the ceramic membrane.According to one exemplary embodiment, the metrological device ensures a long-term stability (in particular long-term stability with respect to drift of a power density measurement value or energetic characteristic variables such as power, current, cell voltage or corresponding measurement data) of at least two months, preferably of at least one year, in particular in that the at least one ceramic is also effective against (salt and / or biofilm) deposition, in particular on the cathode. This particularly long-term stability facilitates a very accurate analysis of rather long processes, such as e.g. wastewater treatment, which can be loaded with data technology, and also opens up new possibilities, in particular with regard to self-learning algorithms for data evaluation. For example, the data collected over a period of e.g. at least three months in a long-term stable manner can be evaluated by an AI model or by at least one ML algorithm in the context of or based on a multi-layer perceptron or MLP regressiver (also as an artificial neural network), in particular in order to be able to correlate the evaluated data with process parameters in a more accurate manner, in particular in the context of the determination of a comparatively general COD parameter. The implementation of an MLP regressive device can also provide the following technical effect, in particular in the context of the measurement-related requirements described here: particularly effective correction of deterministic deficiencies for enabling a parameter correlation, in particular also in the case of measurement data acquisition over several months or years. In this case, the ceramic is effective against deposits (in particular precipitation of salts by evaporation) and fouling, in particular for many months, in particular in combination with the electrodes and a moisture content which is preferably ensured purely by device technology, so that the data can be provided with particularly high quality for a preferably AI-based evaluation and, if appropriate, for an AI training or an ML measure. This can also be optimized in particular by adjusting material parameters such as thickness, porosity and / or material selection and finishing of the electrodes and / or possible intermediate layer active materials such as hydrogels. Thus, the present inventive concept can also be / are implemented even more advantageously in connection with AI-based evaluation and ML-based training on the basis of device-related optimizations in the context of measurement data acquisition, so that, for example, stable long-term monitoring of plants and processes can also be advantageously implemented on an industrial scale, optionally also in combination with process control / regulation on the basis of the measurement data evaluated as described here.It should be understood that the approaches described herein for implementing ML algorithms are preferably targeted to regressive models, less to classification models. Nevertheless, for example, at least one AI classification model can also be implemented in the context of a classification of (ab) water types, e.g. for the purpose of easier assignment of predefined / pre-definable parameter sets to individual classes or preambles of (ab) waters to be examined, analogously for the purpose of easier assignment of basic calibration variants to specific application cases. From a very rough viewpoint, for example, classification into at least the types of municipal waste water and industrial waste water is appropriate, and each type can be freely further divided. In this case, it can remain open whether an output is reached on the basis of a plurality of inputs, or vice versa.A classification can also be / are defined by means of or based on ML states, for example in the manner of a traffic light (green: everything in order, yellow: possible operating disturbances, red: operating disturbances expected).It is also to be understood that the approaches described here for implementing ML algorithms can be / can be implemented specifically with respect to a respective substance fraction, in particular each comprising an artificial neural network (NN) or based on an NN.It is to be understood that the implementation of AI models within the scope of the present invention can comprise a computer-technical infrastructure or data processing architecture, in particular also in the core of at least one computing unit, which also facilitates the execution of ML algorithms centrally directly in / on the hardware, makes it more efficient or accelerated (up to real-time processing) and / or makes it more energy-efficient or at least partly even makes it possible for the first time. For example, the computer-technical and chip-based means described here comprise at least one of the following components: photonic AI chips, in particular with silicon photonic structures (combination of electronic and optical data processing processes), optical waveguides at least partially instead of or at least in addition to electronic semiconductors, and also multiplexing components, photon modulators, photodetectors, ring resonators, at least one deep wavelength division multiplexing (DWDM) component for simultaneous processing of a plurality of data channels, at least one optical circuit integrated into at least one neural network (NN or DNN, deep neural network), at least one photonic processor. For example, at least one NN and / or DNN is executed directly at the hardware level. In effect, particularly large amounts of data can also be analyzed particularly quickly. For example, at least one photonic component is present in a form printed directly onto a wafer, in particular at least one of the following photonic components: optical amplifiers, photonic circuits (PICs), polarization converters, splitters, optical waveguides, splitters, phase modulators.It is to be understood that according to the prior art, all parameters relevant for the measurement evaluation can potentially be affected or influenced by salt / biofilm deposition, presumably primarily the power density or energetic characteristic variables in general (power, current, cell voltage). The open-circuit voltage (OCV) is also successively impaired by scaling in previously known devices. The measures according to the invention described here, in particular in the context of the implementation of the ceramic, on the other hand, enable long-term stable operation over many months, whereas according to the prior art, a decrease, for example of the power density, must already be expected after approximately one month in the range of approximately 50-75%.According to one exemplary embodiment, the at least one metrological microbial electrochemical technology unit is configured as a tubular sensor which has a cathodic region (or cathodic compartment) accessible via a lid, wherein the lid preferably merges into a housing which encloses the at least one ceramic and the anode and cathode or the cathodic compartment. This embodiment provides advantages in particular also for wastewater analytical applications, in particular also in flowing waters. Such a housing protrudes, for example, along the ceramic as far as the anode.According to one exemplary embodiment, the ceramic functions as a separator between anode and cathode. This not least also provides a comparatively simple and robust construction which can also be (size) scaled in a simple manner.According to one exemplary embodiment, the metrological microbial electrochemical technology unit has a membrane-electrode assembly in which the ceramic is present as a membrane in a radially tensile force-biased arrangement with the anode and / or in which the ceramic is present as a membrane in a radially compressive force-biased arrangement with the cathode, in particular in such a way that a relative movement between corresponding electrode and ceramic is prevented, with the surface area contact proportion remaining the same in a predefined manner. This also facilitates ensuring constant operating boundary conditions and thus also the moisture balance over a long operating period of at least a few months.According to one exemplary embodiment, the measurement device is configured to record and optionally also document (monitoring) the microbial activity, in particular via the carbon consumption rate. This can also facilitate the process control during water treatment.According to one exemplary embodiment, the metrological device is configured to generate the at least one energetic / electrochemical (cell) parameter on the basis of modulation, in particular pulse modulation, especially also pulse duration modulation of the external electrical load resistor. The modulation can also ensure not least the provision of an advantageously evaluable measurement data profile and provide a good or even more easily loadable data basis for any downstream data evaluative steps.In particular, in comparison with conventional electrochemical methods (electrochemical impedance spectroscopy, cyclic voltammetry), in which an alternating current is applied to the cell (with a corresponding action on the electroactive biofilm), the modulation described here enables a non-disruptive model-supported parameter determination routine, wherein no potentiostat is required for the parameter determination or correlation described here, accordingly no interventions in the current / voltage profile take place, and a good metrological reaction time can also be ensured (both as regards the sensory response time and the measurement data evaluation time). In other words, no influence is exerted on the microbiology during or by the measurement, and a pre / post-processing time or perceptible evaluation time period does not need to be scheduled. For example, the analysis can also lead very quickly in terms of time to the measurement result which can be used in particular for a control / regulation process, e.g. in the context of a biological purification stage (in particular Belebungsbecken).According to one exemplary embodiment, the at least one microcontroller of the measurement device is configured to implement a modulation, in particular pulse modulation, especially also pulse width modulation without a PC connection. This also facilitates a sensor point-specific implementation with high-quality measurement data that can be provided in a sensor point-specific manner. A sensor point is understood here to be a measurement point in a local sense. As standard, the measurement device described here may define a single sensor point or be provided / configured for a single sensor point, but optionally a plurality of sensor points may also be tapped by a single measurement device.According to one exemplary embodiment, the measurement device has a communication module configured for wirelessly transmitting generated cell parameters. The wireless configuration of a data transmission, advantageously in combination with energy autarchy, opens up further options for the arrangement / implementation of sensor points and for the configuration of comparatively complex measurement-technology systems comprising a multiplicity of sensor points or measurement-technology devices and any supplementary sensor system.According to one exemplary embodiment, the measurement device is configured to evaluate the energy / electrical (cell) parameters generated from the recorded measurement data, in particular measurement data from cell-internal resistance components and / or voltage, capacitance, current, power and / or electrical charge measurement data, based on modulation, in particular pulse modulation, especially also pulse width modulation of the external electrical load resistance, based on at least one AI model or at least one ML algorithm, in particular by means of a / the microcontroller integrated into the measurement device without a PC connection. This also facilitates not least a comparatively simple numerical scaling of sensor points even in comparatively complex measurement systems, with maximum flexibility with respect to a respective sensor point.It is to be understood that the modulation described here enables the generation of a comparatively high number of parameters (in particular >= six parameters), which can optionally also be introduced as input variables into an ANN. It has been found within the scope of the present invention that this can particularly effectively uncover any interferences, as a result of which the measurement or measurement data evaluation can be designed more precisely and more sensitive.If, according to the present disclosure, modulation, in particular pulse modulation, and especially pulse width modulation or pulse duration modulation is also referred to, this is synonymous with a correspondingly acting signal-related measure relating to detected measurement signals, in particular with reference to a carrier signal. In this case, pulse modulation is understood to mean, in particular, a conversion of continuous analog signals into discrete-time signal sequences from individual pulses. The term transient response analysis can also be found in the technical literature in English. Advantageously, at least the voltage signals are modulated (evaluation of the resistance changes as a function of the frequency), optionally also the current flow, in particular for the purpose of determining the charge (reference to the current curve).In accordance with the present disclosure, equations and metrics use both the subscripted notation and the under-stroke notation; these notations are considered synonymous herein. Example: CCR tot and. CCR_tot. Likewise, in the case of elements or molecular names such as, for example, for oxygen, both the notation set forth below and the subscript notation are used interchangeably here. Example: O2 or O 2.According to one exemplary embodiment, the metrological device is configured to correlate the generated cell parameters with the at least one process parameter (P SB) taking into account at least one boundary condition from the following group: conductivity, temperature, pH value; in particular in / for a / n (ab) water treatment process. This not least also enables an increase in the accuracy or load capacity of the measurement data.It is to be understood that boundary conditions can also be taken into account in the process parameter determination, in particular on the basis of environmental influences or external effects, in particular the conductivity, the temperature, the pH value. Such quantities can also be taken into account in the determination of cell-internal parameters. Advantageously, at least some of these variables, depending on the application, are also taken into account in an AI model which can be implemented for the data analysis within the scope of the present invention, in particular in order to take into account their (potential) influence based on self-learning algorithms. For example, the ohmic resistance of the cell can be correlated with the electrical conductivity by the cell constant according to the principle of a conductivity sensor. It is to be understood that an / the implementable / s AI model can also be designed as an already pre-trained AI model, in particular by applying / using at least one ML algorithm within the scope of a (basic) calibration.According to one exemplary embodiment, the metrological device is configured to generate the at least one cell parameter within a time period of at most five minutes, preferably at most two minutes. Such a short reaction time also provides the advantage of high reactivity, for example in applications in continuous flow waters.It is to be understood that the (as small as possible) time span that can be reached depends in particular on the cell capacity and a pause time window of the MET for returning back to an initial state. In particular, the comparatively short reaction time can be attributed to the manner described here for determining the electrochemical parameters, in contrast to typically easily measurable voltage / current measurement variables (in which measurement according to the prior art, however, capacitive influences occur: the capacitance reacts exponentially, that is to say rather slowly, to changes, with corresponding delays in the signal changes, so that previously more work had to be done with a measurement / evaluation duration in the range of hours until a measurement plateau or loadable final value has been reached). Within the scope of the present invention, an already very short time span could be realized, wherein, as expected, further temporal optimization potential can be exhausted. In particular in the context of (ab) water monitoring (analysis), the time interval which can be achieved according to the invention is already to be regarded as sufficiently short, since a wastewater matrix (composition) is expected to change significantly more slowly. Thus, a quasi-continuous measurement can already be mentioned, which is reactive in such a way that relatively rapid changes of the fluid to be examined can also be detected and used as a process control specification.According to one exemplary embodiment, the measurement device is configured to correlate at least one measured value with a process parameter (P SB) for a / the chemical oxygen demand (COD), in particular an (ab) water treatment process to be optimized, in particular in that a correlation with the biocurrent currently generated by the MET takes place via an electron equivalent and / or a current equivalent. In particular, the activation resistance, the cell capacitance, the open circuit voltage, the current density, the power density, the electric charge and / or the ohmic resistance, in particular in the case of organic ions (in particular acetates), can each be correlated with the COD, optionally also with the inclusion of the carbon consumption rate (CCR). On the one hand, this can create a data base that is valuable for further evaluation steps, and on the other hand, it is also possible to provide parameters that are comparatively easy to handle for, for example, plant operators.According to one exemplary embodiment, the measurement device is configured to correlate at least one measured value with a process parameter (P SB), in particular COD, e.g. BCOD, with reference to the biological oxygen requirement (BOD), in particular a (waste) water treatment process to be optimized, in particular by conclusions being drawn from BOD to COD, preferably after a measurement evaluation time of significantly less than five days, preferably at most three days. In this case, an analysis of speciality can also be implemented in general. A BOD5 measurement carried out previously according to the prior art over a period of five days can therefore be mapped much more quickly, as a result of which a valuable (measurement) data base for control / regulation processes can also be created. In other words: over a time window of, for example, one month, significantly more time-related measured values can be determined than before, for example 15 to 30 times. Accordingly, a control / regulation can also be designed to be significantly more reactive, which simplifies process-related optimization measures or makes them more efficient.It is to be understood that a correlation of the above-mentioned measured values with the comparatively general COD can be realized (or must) in a more complex manner than with the BOD, in particular since only the biodegradable portion of the COD is detected in the BOD. However, it is to be understood that the analytics described here may equally be in the context of BOD, COD, carbon consumption rate and material fractions of volatile fatty acids, in particular since it was recognized in the context of the present invention that in each case comparatively easily concreteizable dependencies can be used to determine both a first group (e.g. BOD) and another / further group (e.g. COD) of process parameters, for example also in a balancing manner the so-called biodegradable chemical oxygen requirement (BCD or biodegradable COD), corresponding to the COD with respect to the non-inert portions of the COD alone. In other words: only dissolved fractions can penetrate the cell membrane of the bacteria; inert, non-biodegradable fractions cannot usually be determined; thus, the dissolved substance fractions of COD are measured, for example primarily VFAs, in particular acetate(s). The present invention is therefore also based on the concept of maximizing the data quality by encrypting the COD as much as possible in detail. Inert, biologically nondegradable fractions can be determined by balances. Example: Balance:According to one exemplary embodiment, the metrological device is configured for COD fractionation, in particular for carrying out a real-time fractionation of the COD on a metrological basis.Insofar as real time is referred to according to the present disclosure, this is also to be understood as a time span of one to three minutes, which can be regarded as near real-time analytics, in particular in the context of water treatment processes scaled on a large scale on an industrial scale, with their corresponding inertia. Conceptually, the term "real time" is to be understood here in context-related terms: a continuous measurement (e.g. for the CCR determination, in particular with continuous reference to instantaneous current values) by means of the measurement equipment described here can be realized at least theoretically within milliseconds, and the evaluation of modulated measurement data for the purpose of parameter determination in, for example, COD / BOD analyses may require a duration in the range of a few seconds to half a minute due to system inertia, but in the context of, for example, process control / regulation, comparatively slow water treatment processes may likewise still be referred to as "in real time".According to one exemplary embodiment, the measurement device is configured to correlate at least one measured value with a process parameter (P SB), in particular COD, e.g. BCOD, with reference to substance fractions of volatile fatty acids (VFA, liquid and volatile at room temperature; acetates, propionates, butyrates, isobutyrates, valerates, isovalerates, capronates), in particular in that at least one type of VFA (in particular acetates) is measured or determined directly via the current flow and is taken into account in the evaluation or correlation of further process parameters. This not least extends the usability of the determined data and can also improve the load capacity of the analysis, in particular also with regard to a plausibility check. Preferably, at least the fraction acetates is measured / detected, in particular since it is strongly metabolized by exoelectrogenic bacteria. In this case, VFAs, in particular acetates, can be measured via the current flow, whereas a direct concentration measurement can be implemented without further ado. However, since the exoelectrogenic bacteria preferentially metabolize acetate, the CCR (rate) can be used as a reference for the presence of acetates. The higher the CCR, the more acetates are present (1mA=7.2mgCO / d, the chemical oxygen demand COD referring to the COD of acetates).It is to be understood that a correlation of the above-mentioned measured values with reference to VFAs can be implemented in a comparatively simple manner, as expected, thanks to particularly strong interdependence, so that the quality of the evaluated measured data may continue to increase as soon as VFAs are included.According to one exemplary embodiment, the measurement device is configured to correlate at least one measured value with a process parameter P SB for the carbon consumption rate, in particular in the case of a (waste) water treatment process to be optimized, in particular in that the biocurrent generated is correlated or converted with the carbon consumption rate, in particular is configured to also determine a process parameter P SB for the chemical oxygen demand (COD) or the COD itself on the basis of the carbon consumption rate. This not least extends the usability of the determined data (in particular also by users, e.g. in process-related optimization measures in processing systems) and can also improve the load capacity of the analysis, in particular also with regard to a plausibility check.The present invention is also based on the finding that by (preferably continuous) measurement or determination of the carbon consumption rate (CCR), important findings can be obtained, in particular with regard to the (health) state of the bacteria involved (which may be relevant to plant operators and process control), in particular based on a pre-definable conversion factor correlation of generated biocurrent and CCR, so that a (clarifying) plant operator or another user can also be enabled by means of the measurement approach described here based on determined CCR and determined COD / BOD, a (proactive) plant / process control. The COD is preferably represented as an electron equivalent (eeq), namely: 8gCSB=1eeq. This relationship can also be expressed as current equivalent: 1 mA = 7.2 mgCSB / d. Based on this relationship, a direct correlation of biocurrent generated by the MBZ and the COD can be provided. In particular, the COD can be deduced by the generated biocurrent via factor 7.2. In other words, the measured biocurrent flux can be represented as a measure of the measured carbon consumption rate CCR gem. It can be taken into account here that only that portion of the electrons which is not used for biomass build-up is measured, i.e. only that portion of the electrons which is transferred to the electron acceptor (anode) in the course of the energy metabolism. In order to obtain the total / absolute carbon consumption rate CCR tot( anabolism and catabolism taken together), the so-called yield rate (Y) can be advantageously used. This can be assumed theoretically to be 0.243 gCO / gCO (COD, chemical oxygen demand). Based on a half reaction approach and a concept of yield (yield rate) approach, the total carbon consumption rate CCR tot can therefore be determined:In this context, the terminology may also be / are defined as follows:This is the so-called true yield coefficient or true yield. In contrast to the observed yield coefficient ("observed" yield), the "true" yield does not take into account any dying of the bacteria, i.e. it is derived on a theoretical basis (from stoichiometry).Not all bacteria in the fluid or wastewater to be investigated are detected here, but only the so-called exoelectrogenic bacteria / microorganisms, i.e. only those species / species which are capable of transferring electrons to the anode, it being possible for these bacteria to be used as indicator organisms.Edge note: In view of the fact that the sum of catabolism and anabolism is referred to as metabolism, CCR_Met may alternatively also be selected for the terminology CCR_tot.By the (continuous) measurement of the CCR, it is accordingly possible in particular to derive the "state of health" of the bacteria, i.e. for example to determine whether, for example, there is a nutrient limitation. This can also facilitate process control, in particular increase the efficiency of wastewater treatment. In addition, wastewater quality parameters can enable a deeper diagnosis, as described here in particular with reference to determination steps based on modulation and / or machine learning (ML).Purely by way of example, an example of application is outlined here from the point of view of a plant operator:An industrial plant initiates a highly stressed COD waste water stream. By changing the composition of the waste water, the activity of the bacteria and thus the CCR increase instantaneously. The sewage treatment plant operator should thus take care of possible process disturbances in a more focused manner. Based on the measurement approach described here, advantageously also including modulation and / or ML measures, it can be determined as expected that or to what extent the COD concentration has increased. This information can be used by the operator, for example, to counter possible process disturbances (e.g., compliance with the run-off limits) or to optimize or make more efficient the processing process (e.g., for the purpose of minimizing greenhouse gas emissions and / or minimizing energy consumption). By determining the electrical biocurrent generated at the moment and the instantaneous CCR by measurement technology, a sewage treatment plant operator, for example, can currently track the activity of the bacteria and interpret it directly by the known characteristic variable of the COD and initiate a open-loop / closed-loop control measure, for example, or even specify it directly on the basis of CCR and / or COD.According to one exemplary embodiment, the metrological device is autonomous in terms of energy, in particular in that the at least one metrological microbial electrochemical technology unit independently covers the energy requirement and / or in that the metrological device is equipped with at least one means for generating energy, for example with at least one solar collector unit. This not least provides even greater flexibility or variability with regard to the use of the measurement devices described here, in particular in complex measurement systems and / or at rather inaccessible sensor points. Not least, it is also possible to further minimize the outlay which arises in the context of maintenance of the sensor system.According to one exemplary embodiment, the measurement device is energy-autonomous for electroless measurement, in particular in that the energy required for operating the measurement device is generated by the at least one measurement-technology microbial electrochemical unit. The energy autarchy also provides not least the high flexibility / variability described here, in particular with regard to (including low-maintenance) selection and arrangement of a multiplicity of sensor points, which brings with it perceptible advantages especially in comparatively complex metrological systems, for example in the case of a multiplicity of metrological devices distributed over a wide-range treatment plant or over a wide-range body of water.It is to be understood that the (bio) energy that can be generated by means of one or more parallel-connected MBZs or METs is sufficiently large / high in terms of amount that at least one energy storage unit (battery) of the measurement device can be charged, by means of which sufficient energy can be kept ready for wireless data transmission and / or modulation, in particular based on ultra-low power management system components. Thus, for example, a battery could be charged more or less continuously in order to be able to supply the required energy for wireless data transmission and optionally also modulation, in particular pulse modulation, especially also pulse width modulation.For example, a power management system component can boost a 20 mV input voltage to approximately 2 to 5 V (in particular by means of interconnected capacitors). For example, a starting voltage of 330 mV is provided, with a minimum input voltage of 100 mV, with a permanent input voltage in the range of 3.3 to 5.5 V. For example, the measurement data or measurement values / parameters (in particular COD, BOD) are determined every 5 to 15 min by means of modulation and optionally also artificial intelligence, e.g. in wastewater treatment systems. In the intermediate phases in which no parameter determination takes place, the respective MBZ or the corresponding MET can deliver (bio) energy for accumulation. The generated or excess energy can optionally also be used in another way, for example for further sensors such as temperature sensors, conductivity sensors, pH value sensors. At least a portion of generated (bio) energy is advantageously provided for microelectronics of the measurement device and for data transfer.Furthermore, it is to be understood that the autarky advantages described here can be ensured for numerous different constellations. Although a certain biological / chemical activity is also required in each case in order to be able to generate (bio)energy at all from the process of the MET(s), it would be difficult to specify a lower threshold value for the COD, in particular since many factors can have an influence thereon (e.g. external resistance, substrate, temperature, reactor design). The skilled person can be able to calculate a guideline for the implementation of energy autarchia via the so-called semi-saturation constant of the exoelectrogenic bacteria / microorganisms.According to one exemplary embodiment, the measurement device comprises at least one sensor which generates measurement data relating to at least one fluid characteristic from the following group and is / is supplied in terms of energy via the measurement device, which is preferably autonomous in terms of energy: temperature, pH value, conductivity; wherein these measurement data relating to at least one fluid characteristic are preferably taken into account for correlating the at least one measurement value with the at least one process parameter. This can also facilitate an even more exact consideration of possible dependencies on parameters or metrology boundary conditions, whereby the data base can be further improved or additionally designed to be more secure / loadable.According to one exemplary embodiment, the measurement device comprises a plurality of measurement-technology microbial electrochemical units, in particular in an at least singly redundant arrangement at / for the same measurement point, wherein the measurement device is configured for a cross-sectional measurement or mean value measurement over the plurality of measurement-technology microbial electrochemical units for the respective or corresponding measurement point. This can further improve the data basis and also facilitate a plausibility check, in particular with the comparatively low measures or costs per sensor point based on the technical device described here.According to one exemplary embodiment, the measurement device is configured / implemented for analysis or at least for detection of photosynthetic processes or soil moisture. This extends not least also the application spectrum for the analytics described here, in particular based on a / the very cost-effectively realizable device engineering design per measurement point.According to one exemplary embodiment, the logic unit is configured to evaluate measurement data based on machine learning, wherein cell parameters are evaluated for determining the chemical and / or biological oxygen demand and / or the carbon consumption rate and / or substance fractions of volatile fatty acids, which are / have preferably been generated based on modulation, in particular pulse modulation of the external electrical load resistance of measurement data relating to cell-internal resistance components and / or voltage, capacitance, current, power and / or electrical charge measurement data, which are recorded over an evaluation period of at least 30 days (which is not affected due to the system). This can also extend the spectrum of analyzable data, improve the correlation, and also facilitate the most detailed possible discovering of a relationship between biological / chemical processes and effects arising therefrom in the fluid to be examined.It is to be understood that the application of ML algorithms or an AI training can advantageously take place locally at the respective sensor point or measurement point, in particular by a / the sensor point-specific microcontroller. However, this process can also be remotely outsourced (externally assigned external to the system), i.e. by first transmitting the data to be evaluated and then processing it centrally. Alternatively or additionally, an already pre-trained AI model or an ML algorithm can also be / are implemented, in particular in the context of a basic calibration, based on which results can be produced without necessarily having to have already collected measurement data. Thanks to a basic calibration, parameters of an AI model or ML algorithm to be used optionally can also be determined in advance, for example by using a calibration solution (e.g. synthetic waste water) and / or by using parameters of an / of the ANN that have already been determined for other waste water. Advantageously, a distinction is made between municipal and industrial wastewater.Such a basic calibration can be extended or readjusted over time by current measurement data (recalibration during operation or in parallel with use over time), in particular in such a way that the applied AI model or at least one applied ML algorithm can be adapted more specifically to the respective application (e.g. specific sewage treatment plant type). For example, based on an artificial neural network consisting of at least three layers of neurons (input layer, at least one hidden layer, output layer) or based on a directed acyclic graph, a calibration can be carried out to the effect that the measurement device can be provided ready for use, i.e. can provide measurement results directly without training in the field. In particular, electrical or electrochemical parameters are linked via the input layer to at least one intermediate layer (which is defined specifically, for example, for each wastewater to be examined) in order to pass from the at least one intermediate layer to the output layer, which outputs the COD, for example. Nodes and parameters can be determined and adapted, for example, within the scope of a global calibration.According to one exemplary embodiment, the measurement device, in particular the measurement microbial electrochemical technology unit, has a basic calibration, in particular a basic calibration set by means of at least one ML algorithm. This also facilitates immediate use or immediate functionality in the field, i.e. without a certain amount of data having to be generated beforehand by the user or without AI training having to take place.A basic calibration is understood here to mean either standard or application-specific preparation of the manner of the measurement-technology evaluation by the measurement-technology device, in particular using at least one ML algorithm. In analytical chemistry in particular, calibration is generally understood to mean a process which aims at establishing a predefined / pre-definable mathematical relationship between a measured physical variable and the concentration of the analyte (measured physical variable=output signal of the sensor or response signal; in the case of the MET described here, therefore, the corresponding energetic and electrochemical characteristic variables). Due to various influencing factors when used in real wastewater, more complex nonlinear relationships occur, which can be detected or mapped based on the MET described here, in particular by means of an AI model. In particular on a laboratory scale (offline), defined conditions can be created, which can be used for the basic calibration of the metrology device or for defining the AI model. For example, when using synthetic waste water, a unique mathematical relationship can be derived. Under optimum boundary conditions, the following assumption applies: the electric current flow is proportional to the substrate concentration under unsaturated conditions (linear relationship). This assumption is made / supported largely in the technical literature studies, but is not applicable for, for example, municipal wastewater or is not portable for analysis (in particular since too many / strong interferences occur which influence the current signal, for example also too large fluctuations of temperature, pH value, conductivity, other bioactive substances). Thus, there is great benefit to a basic calibration, which is set up in particular by means of at least one ML algorithm, in conjunction with a pre-trained AI model, in order to be able to arrive in the next step in an application-specific manner with a further application-specific trained AI model.In this case, a distinction is made here, based on the preamble of basic calibration, between so-called global calibration here and so-called factory calibration here: the latter can be considered as a type of standard calibration. By contrast, the global calibration can be / can be implemented in particular on an application-specific basis, for example by a user (for example industrial sewage treatment plant operator or operator of municipal sewage treatment plants) providing an expected measurement range for the wastewater to be analyzed (for example expected minimum pollution, medium pollution, maximum pollution), and by the metrological device being preset for this measurement range, in particular by using at least one ML algorithm, for presetting an / the adequate AI model. Subsequently, plausibility checks can be carried out, if necessary, for example after specific time intervals of the operating duration. Both types of calibration are suitable for a delivery state of the metrology device in such a way that the metrology device is immediately usable and can generate measured values.With regard to the measures described here for implementing ML algorithms, it should be mentioned that it has been shown within the scope of the investigations according to the invention that AI models (specialized AI, in contrast to a generalized AI) which emerge therefrom can be roughly divided at least with regard to the following three topic ranges or task fields, wherein a specific AI model can be implemented for each topic range: mapping the parameter correlation as such; overcoming a deterministic deficiency for describing interdependencies; providing at least one calibration state. In this case, the AI implementation described here is preferably already at least two-stage with regard to the calibration, namely firstly with regard to presetting a / the basic calibration optimized in an application-specific manner, for example on the basis of a (waste) water classification (keyword warm start when first started), and secondly with regard to presetting a self-learning calibration for continuous operation over many months or years which adapts to specific metrological boundary conditions in the field. In this respect, a learning (self) calibration function can also be provided, in contrast to deterministic / predefined calibrations, which would entail measurement-related disadvantages, in particular in the context of wastewater monitoring described here.It is also to be understood that a / the modulation described here, in particular pulse modulation, especially pulse width modulation as well, is not a necessary criterion in order to be able to carry out an AI training, but that ML algorithms can also be advantageously implemented if no modulation is provided, for example by evaluating voltage profiles (in particular in batch operation). For example, profiles, curves, and similar characteristics are evaluated with computer assistance with reference to slope, area / area, maximum stress, or similar curve parameters.In the context of implementing machine-assisted, in particular self-learning, data analysis, it is to be understood that boundary conditions, in particular due to environmental influences or external effects, may also be taken into account, in particular the conductivity, the temperature, the pH value. An AI model which can be implemented for the data analysis within the scope of the present invention or can already be provided in a pre-trained manner advantageously takes into account at least the three boundary conditions mentioned here (conductivity, temperature, pH value), in particular in order to take into account its (potential) influence during the evaluation.Thus, by the implementation of at least one AI model described herein, at least one of the following technical effects can be ensured:providing a basic calibration functionality which can already be implemented on an application-specific basis, in particular for a first functionality, e.g. in the context of installation and inoculation (startup phase for forming an electroactive biofilm), in combination with an application-specific self-learning calibration function, in particular thanks to classification of (ab) waters into subgroups (e.g. municipal and industrial wastewaters) for a type of warm start based on the basic calibration;improved correlation during long-term operation, in particular thanks to high data quality for AI training even during multi-month operation;higher data quality, in particular thanks to self-learning adaptation;providing a self-learning calibration function for a particularly high data quality in the field even over a duration of several months;In this case, a self-learning calibration function can also increase the quality of the wastewater quality parameters (COD, BOD, etc.), in particular by adapting the calibration function to the specific wastewater.The metrological device can be designed as warning devices with a warning function, in particular with regard to toxic substances such as heavy metals, nitrates, antibiotics, in particular with implemented triggering of a warning signal as a function of at least one predefined threshold value being exceeded / undershot, for example in connection with or in the context of so-called flushing surges and / or (pump) operating failures, for example of pumps or the like, of devices or equipment influencing a level.According to one exemplary embodiment, the metrology device is configured to preset, control and / or set a calibration of the metrology device based on the external load resistance, in particular preset at least one calibration setting of the metrology device by adjusting the external load resistance, in particular preset, in particular to expand, a / the basic calibration setting, in particular a linear range of the calibration. This also facilitates the optimized setting of the measurement device for specific measurement ranges, e.g. with regard to particularly contaminated wastewater on the one hand or with regard to monitoring a rather clean body of water on the other hand. An adjustment of the external load resistance can also be understood to mean an adjustment of the boundary conditions during modulation, in particular pulse modulation, in particular with regard to the required / desired changes in the voltage signal in terms of amount (tuning of the resistance effective in terms of amount with regard to a voltage signal change appropriate for the respective application for the purpose of optimizing the boundary conditions for the parameter determination, for example depending on an application-specific composition of an examined wastewater). This also makes it possible to avoid negative effects such as a bending of the course or a so-called overshoot.It is to be understood that the present invention is also based on the concept of already equipping the measurement device with an advantageous calibration, in particular in an application-specific manner, in particular in order to facilitate the commissioning in the field before sufficient data are accumulated for the own AI-based adaptation of the calibration and / or further settings. In this case, the linear range of the calibration can also be set / expanded by adjusting the external load resistance, with the result that, starting from a basic calibration, an application-specific configuration can be found or predefined even more easily, by means of which configuration the training in the field can be started or refined in an optimum manner. The response behavior of the MET can thus also be set on the basis of a specification on the basis of the external load resistance.The aforementioned object is also achieved by an (ab) water treatment system, having at least one metrological device according to the present disclosure, or wherein the water treatment system is at least configured to be in data communication with such a metrological device, and having a control / regulation unit configured to control / regulate an (ab) water treatment process as a function of measurement data or process parameters provided by means of the metrological device preferably wirelessly via at least one communication module, in particular based on a / the metrological method described here. As a result, the aforementioned advantages can be realized, in particular with regard to the implementation of particularly efficient process optimization measures.The aforementioned object is also achieved by a (ab) water treatment process, operated or at least optimized based on measurement data or process parameters provided by means of at least one metrology device according to the present disclosure, in particular based on a / the metrology method described here. In this way, the aforementioned advantages can be realized, in particular with regard to a very targeted process-specific control / regulation based on target variables provided by the analytics described here, e.g. for the purpose of more efficient energy saving measures.The aforementioned object is also achieved by a measurement system comprising at least one measurement device according to the present disclosure, having at least one database and at least one arithmetic unit configured to evaluate measurement data based on machine learning, wherein cell parameters are evaluated for determining the chemical and / or biological oxygen demand, which are / have been generated based on modulation, in particular pulse modulation, of the external electrical load resistance of measurement data relating to cell-internal resistance components and / or voltage, capacitance, current, power and / or electrical load measurement data, which are / have been recorded over an (system-dependent unaffected) evaluation period of at least 30 days, in particular using the measurement system in one implementation for a measurement method / methods described here. In this way, the aforementioned advantages can be realized, in particular with regard to the evaluation of comparatively complex correlations, in particular with reference to numerous measurement points in a type of sensory network, in particular in the case of comparatively complex installations / processes.According to one exemplary embodiment, the metrology system comprises at least one metrology device according to the present disclosure, wherein the metrology system provides the at least one metrology device in each case at a plurality of different measurement points and provides a network or a swarm or a grid of measurement points which can be evaluated in combination with one another. This facilitates an analysis, which is as accurate as possible, of even very complex installations / processes and can improve the data quality and facilitate a type of plausibility check or measurement data verification.According to one exemplary embodiment, the measurement system is configured to evaluate a plurality of different measurement points at which a plurality of measurement-technology microbial electrochemical units are provided in each case. An at least partially redundant implementation of sensor systems per measurement point also provides an even greater load capacity of the measurement data.The aforementioned object is also achieved by a computer program product comprising instructions which, when the computer program product is executed on a computer or a metrology device or a metrology system, cause said / s to execute a method according to the following steps, namely a method for generating at least one energetic / electrochemical parameter from measurement data acquired by means of at least one metrology microbial electrochemical technology unit based on bioelectrochemical processes, wherein at least one measurement value is correlated with at least one process parameter (P SB) in particular with a process parameter (P SB) for the chemical / biological oxygen demand (COD / BOD) and / or for a carbon consumption rate and / or for substance fractions of volatile fatty acids, in particular acetates; in particular by means of a metrology device according to the present disclosure; wherein the measurement data are acquired by means of the at least one metrological microbial electrochemical technology unit having at least one active ceramic arranged and effective between the cathodic region and the fluid to be examined, wherein the generation of the at least one energetic / electrochemical parameter is carried out acquired from measurement data over an evaluation period of at least 30 days, in particular measurement data from cell-internal resistance components and / or voltage, capacitance, current, power and / or electrical charge measurement data. This also enables, in particular in the context of the aforementioned advantages, a comparatively fast and comprehensive analysis, with results which can be provided in a usable manner for numerous purposes.According to one exemplary embodiment, a / the separator of the metrological microbial electrochemical technology unit is defined by means of the at least one ceramic, which separator separates an anodic region and a / the cathodic compartment of the membrane electrode assembly in the manner of a full-surface intermediate layer in such a way that a long-term stability of at least two months, advantageously at least three or four months, is ensured by measurement, and the measurement data is provided as a data basis for AI training without perceptible drift and evaluated on the basis of at least one self-learning algorithm. The device-related measure described here on the membrane-electrode assembly (implementation of a ceramic bridge between the electrodes adjoining it) not only promotes the (constructive) construction of the device as such, but also directly influences the achievable or implementable measurement data evaluation measures.According to one exemplary embodiment, generating the at least one energetic / electrochemical parameter comprises a modulation, in particular a pulse modulation, of the external electrical load resistor. This also advantageously provides evaluable input variables, e.g. also for an ML algorithm (e.g. for an ANN), as a result of which the analysis can be further improved and correlations can be more clearly recognized and, e.g. also used as a basis for the output of application-specific control / regulation parameters.According to one exemplary embodiment, a / the modulation, in particular pulse modulation without a PC connection, is carried out, namely locally at a / the corresponding sensor point or measurement point.According to one exemplary embodiment, the collected measurement data, in particular measurement data from cell-internal resistance components and / or voltage, capacitance, current, power and / or electrical charge measurement data, are evaluated on the basis of at least one AI model or ML algorithm. This not least also facilitates a correlation analysis, a pattern recognition and / or an evaluation of quite specific measurement data profiles, e.g. with regard to recurrent characteristics of the curve discussion, so that application-specific target variables can be generated and output more easily and accurately.According to one exemplary embodiment, at least one boundary condition from the following group is taken into account for correlating the generated cell parameters with the at least one process parameter P SB in particular provided by a corresponding sensor for acquiring measurement data relating to at least one fluid characteristic from the following group: conductivity, temperature, pH value. This also improves the evaluation of measurement data relating to variables or parameters which may depend on at least one of these boundary conditions of the fluid characteristic.According to one exemplary embodiment, the generated cell parameters are correlated with the at least one process parameter for at least one process-specific activation stage of a water treatment process, in particular in combination with a control / regulation of the water treatment process, for example in an energy-related manner (energy consumption minimization) based on the determined measurement data. This not least simplifies the implementation of processual optimization measures, for example for plant operators.According to one exemplary embodiment, at least one measured value, in particular with respect to the activation resistance, the cell capacity, the open circuit voltage, the current density, the power density, the electric charge and / or the ohmic resistance, in particular in the case of organic ions (in particular acetates), is correlated in each case with a process parameter P SB for a / the chemical oxygen demand (COD), in particular via an electron equivalent and / or a current equivalent based on the biocurrent generated instantaneously by the MET, optionally also with the inclusion of the carbon consumption rate (CCR). The determined correlation or the COD can be output as valuable output data, for example for a process control.According to one exemplary embodiment, at least one measured value is correlated with a process parameter P SB, in particular COD, based on the biological oxygen demand (BOD). According to one exemplary embodiment, a measured value is correlated with a process parameter P SB, in particular COD, based on substance fractions of volatile fatty acids or short-chain fatty acids. The particular type of correlation selected demonstrates the variability of the analytics described herein, which also facilitates application specific implementation.According to one exemplary embodiment, the carbon consumption rate (CCR) is determined, wherein the carbon consumption rate is output as a process parameter that can be used in particular within the scope of open-loop / closed-loop control and / or is further evaluated for determining a process parameter P SB for the chemical oxygen demand (COD) or the COD itself. The analysis based on a correlation of CCR and COD can make use of two process parameters which are particularly valuable in particular in the context of wastewater treatment for downstream steps, e.g. for open-loop / closed-loop control.According to an embodiment, the carbon consumption rate (CCR) is determined based on biocurrent generated by the metrology microbial electrochemical technology unit of the metrology device, in particular with reference to an electron / current equivalent of the COD (1 mA=7.16 mgCSB / d) and the yield rate 0.243 grams COD biomass per gram COD substrate. This not least also provides a valuable data basis for further analyses, in particular with respect to wastewater quality parameters, in particular based on modulation and / or machine learning algorithms.Advantageously, at least data relating to CCR and COD (or the corresponding process parameters) are transferred to a user or plant operator, in particular for the purpose of continuous process monitoring and optionally also initiation of control / regulation measures.According to one exemplary embodiment, the evaluation of measurement data is carried out on the basis of machine learning, wherein cell parameters for determining the chemical and / or biological oxygen demand and / or the carbon consumption rate and / or of substance fractions of volatile fatty acids are evaluated, which are / have preferably been generated on the basis of modulation, in particular pulse modulation, of the external electrical load resistance of measurement data relating to cell-internal resistance components and / or voltage, capacitance, current, power and / or electrical charge measurement data, which measurement data have been recorded over an evaluation period of at least 30 days. This can also facilitate the correlation or joint evaluation of process parameters considered more separately up to now, in particular COD and CCR and optionally substance fractions of volatile fatty acids (VFAs), and reveal relationships between biological / chemical processes and effects arising therefrom, i.e. contribute to better understanding of processes, for example in wastewater treatment processes.According to one exemplary embodiment, the metrological microbial electrochemical technology unit is designed as a three-electrode system with a / the third electrode in the embodiment as a reference electrode, wherein the potential is measured in particular in the immediate vicinity of the anode by means of the reference electrode, in particular simultaneously with the measurement carried out by means of the membrane-electrode assembly of the MET. This also facilitates an optimization of the accuracy and can also facilitate further improvements in the long-term behavior, for example. In particular, a possible influence of the cathode can be largely masked; the measurement can also be focused on the anode which is primarily relevant. It is to be understood that the reference electrode is / is advantageously placed in the immediate vicinity of the anode (potential determination with respect to anode / cathode; determination of voltage / potential between reference electrode and anode or cathode).According to one exemplary embodiment, the measurement device, in particular the measurement microbial electrochemical technology unit, has a basic calibration, in particular a basic calibration set by means of at least one ML algorithm, wherein the generation of the at least one energetic / electrochemical parameter from the collected measurement data takes place on the basis of the basic calibration. This not least facilitates a predefined setting, in particular at the beginning of the operating duration, which can be further adapted over time by experience values in the field. In this way, for example, the changeover of previously used measurement equipment to the measurement systems described here can also be facilitated for a plant operator, in particular also in the sense of a temporarily parallel implementation and plausibility check or mutual checking of the generated measurement data. Based on a basic calibration, a basic stock of measurement data can also be provided, on which an application-specific optimization or implementation can be based. A type of initial state can also be provided, which can be used by an ML model.It is to be understood here that, in particular in the context of the BOD1 or BOD5 measurements, a usually comparatively high measurement uncertainty existed hitherto, at least with respect to the COD, or could not be overcome in a simple manner; the fault tolerance was expected to be even in the range of ±30% in many applications. The measurement imprecision interval may even be in the range of ±20 to 40% overall deviation, taking into account all factors (sampling, storage and laboratory measurement). The present invention makes it possible, in particular in the context of a / the more accurate BCD determination, to overcome this disadvantageously large tolerance in an elegant manner. In particular, it was recognized within the scope of the present invention that the high long-term data quality that can now be achieved can lead to a particularly loadable parameter correlation, data evaluation and / or data processing, in particular also in the context of the ML or AI implementation measures described here.It is to be understood that the reference here at a plurality of points to an "evaluation period of at least 30 days" is to be regarded as a lower threshold value limit, which can also be exceeded by a comparatively large factor without problems by means of the technology and implementation described here, for example by a factor of 3 over at least 90 days. This also applies to applications in which the inoculation (formation of the electroactive biofilm) takes place directly in the fluid or wastewater stream, i.e. the sensor system can be very pragmatically directly incorporated or suspended in a wastewater without any treatment or the like being required beforehand. For inoculation up to stationary metrological operation, only a few days at most are to be used in the single-digit range, for example three or five days. In direct comparison with conventional online sensor systems, which are (must be) cleaned usually weekly or every two weeks, this advantageous long-term behavior also results in great advantages in daily practice.It has been found that by means of the measuring technology concept described here, it is also possible to distinguish comparatively unambiguously between measurement uncertainties and, for example, events such as flushing surges or external dilution effects, in particular thanks to a comparatively sensitive gait line of microbial activity (metabolism). In particular, it can be evaluated that / if changes in metabolism in the stationary phase are predominantly attributable to changes in the fluid or wastewater composition, in particular to events such as heavy rain or snow melt (or introduction of scattering salt into the sewer or sewage treatment plant, with the effect of an increase in conductivity), wherein smaller fluctuations can be attributed to time-of-day-related fluctuations in the dirt load (e.g. user behavior, e.g. in the standing phase of the population). A correlation in this respect can also be refined based on online measurement technology of a respective (clarifying) plant, in particular concerning pH, temperature, conductivity, volume flow.In this case, by means of the measurement technology described here, an identification and evaluation of events can also be carried out, for example, from the following group:daily courses (in particular on dry weather days), in particular by evaluating load peaks (variable over time, in particular depending on the day of the week, feitage, environmental influences, or the like);rain veins with dilution effects (in particular higher flow rate at reduced concentration);salt entries, in particular due to rinsed-off scattering salt of roads (in particular increases in conductivity);Specifically, the knowledge of load peaks or daily movements can also be / are implemented as a boundary condition or parameter in the open-loop / closed-loop control of a plant or a process.Especially with regard to rinsing surges or introduction of scattering salt, it is to be understood that the theoretical expectation would predict a likewise abrupt decrease in the metabolism (dilution effects) due to an increase in the flow rate, which, however, will not occur or is not detected by measurement technology, since the conductivity briefly increases rapidly when scattering salt is introduced into the channel network, whereas the conductivity does not increase noticeably in the case of a rinsing surge (redissolving of deposited contaminants in the channel, in particular in the case of heavy rain). Rather, in the latter event, the metabolism rises briefly. From these analyses, the type of the respective event can be deduced by means of the measuring technique described here, without the measurement accuracy or the load capacity of the analysis suffering.Especially with regard to daily operations, it is to be understood with regard to their evaluation that a respective daily operation can be correlated or correlated, inter alia, with the flow rate, wherein an optionally application-specific time delay can be fed back in particular to the measurement point with regard to the flow rate (usually this is upstream of the process phase of a preliminary clarification in water treatment systems, whereas the biosensor or the MET is preferably placed at the end of the preliminary clarification). That is, a certain hydraulic residence time in the pre-clarification may explain the slight offset between metabolism and flow rate.Not least, the following application example can also emphasize the high robustness of the measurement technology described here: identification of a pump failure (i.e. warning / diagnostic function in a malfunction situation), wherein the MET can be / remain arranged / remain temporarily (e.g. a day) also in the air, i.e. not surrounded / surrounded by fluid, without being damaged due to the situation. This also demonstrates the robustness of the biofilm-based sensor technology described herein.Thus, the manner of evaluation can be implemented, on the one hand, in particular by combination with an online measurement technique of a respective installation, and, on the other hand, there is the possibility of comparatively simple differentiation of events such as, for example, flushing surges and scattering salt introduction, in particular with reference to the conductivity. By including an (application-specific) residence time (of the fluid to be examined), in wastewater plants, for example in the so-called preliminary clarification, the correlation of measurement data and at least one parameter described here can be facilitated or improved in accuracy.The present invention also enables a comparatively strong correlation of biosensor data to online measurement data, for example of a sewage treatment plant (for example with respect to volume flow, conductivity, temperature). In this case, the parameter determination routine described here (in particular including a / the modulation) can advantageously also be used easily under real operating conditions. The bioelectrochemical signal is distinguished by a very smooth and stable curve profile, which creates good preconditions for the data analysis based thereon. With regard to the catholyte produced by means of the technology described here, it can also be established that it advantageously has the properties which are recommended in theory (very clear liquid, pH value in particular in the range of 10, conductivity in particular in the range of about 4.4 mS / cm), whereas, for example, wastewater has an average conductivity in the range of 0.8 mS / cm. The catholyte formed thus has the desired bactericidal effect, i.e. biofilm formation on the cathode can be prevented effectively in the sense of a self-protection mechanism.The present invention can also be seen in the context of three planes or development platforms: the ceramic MBZ as such, or the MET (in other words: the biosensor);embedded system, namely hardware (microcontroller, AD converter, and the like) and software components (firmware);a system with platform functionality accessible via a graphical user interface (in particular in the form of a dashboard for visualizing data);In addition, it can be mentioned that the measurement-technology components described here can be implemented or applied in a simple manner in such a way that comparatively severe environmental influences, such as, for example, heavy rain, snow, frost or the like, do not impair the functionality or functionality of the measurement-technology components described here. Rather, their implementation at a high safety level can also be effected in the context of a warning function. This is because it has been found that the exoelectrogenic bacteria (although anaerobic) can also be exposed to atmospheric oxygen for a certain time without suffering damage (thanks to robust biofilm).The aforementioned object is also achieved by a metrological device configured to generate at least one energetic / electrochemical parameter from measurement data based on bioelectrochemical processes, said measurement data being recorded over an evaluation period of at least 30 days, comprising at least one metrological microbial electrochemical technology unit (MET) having a cathodic region and having at least one ceramic arranged between the cathodic region and the fluid to be examined, wherein the MET is configured to correlate at least one measurement value with at least one process parameter (PSB) based on processed measurement data; in particular a metrological device according to the present disclosure; wherein the metrological device is produced by enclosing the ceramic between an inner supporting structure implemented with pressure radially outwards and an outer supporting structure implemented with tensile stress radially inwards, in particular with the outer supporting structure acting as a current collector, optionally with at least one of the inner and outer supporting structures as an integral component of cathode and / or anode, wherein the ceramic is / is advantageously provided in a configuration as an at least sectionally cylindrical body, in particular tube, with a geometrically at least approximately cylindrical structure between anode and cathode, wherein the enclosing preferably forms a three-component membrane-electrode assembly with ceramic and electrodes in each case in full lateral contact. This not least provides a simple, robust, cost-effective configuration which can also be implemented for a plurality of measurement points without the costs or the outlay of the entire measurement system increasing disadvantageously.It is to be understood that the measuring device described here can be easily adapted to application-specific conditions thanks to a robust simple construction and thanks to a uncomplicated design, so that in particular the following advantages can be realized in a simple manner:good tightness, minimized leaks;greatly reduced complexity, in particular based on the design concept of a ceramic cylinder having (at least) two electrodes;dispensing with a gas diffusion layer and with PTFE materials, whereby a very environmentally compatible construction can be realized;Use of cost-effective materials, for example also in the context of the electrodes (e.g. activated carbon fiber felt);simple access to the cathode, easy replacement or easy regeneration of the cathode, for example by acid treatment (if appropriate), for example to prevent potential salt deposits;further maximizing the long-term stability according to the invention (in particular also with respect to moisture at the cathode, bactericidal environment, minimized salt deposition).In summary, three particularly advantageous aspects of the measurement device described here can be emphasized:Simple robust structural design facilitates application to sewage treatment plants and in other environments of comparable aggressive nature, with advantageously simple maintenance (for example only after several months);particularly advantageously high stability for low-maintenance long-term operation, in particular also in the context of a cylindrical ceramic chassis;Comparatively easy realization from a cost standpoint thanks to inexpensive materials.The aforementioned object is also achieved by a computer program product for controlling / regulating at least one manipulated variable of a water treatment process based on measurement data or process parameters provided by means of a / the measurement method described here. Based on the aforementioned advantages, this also enables in particular a very efficient control / regulation, in particular since the parameters determined by measurement can be provided particularly reactively / quickly in time.The aforementioned object is also achieved by a metrological device configured to generate at least one energetic / electrochemical parameter from measurement data based on bioelectrochemical processes recorded over an evaluation period of at least 30 days, comprising at least one metrological microbial electrochemical technology unit (MET) having a cathodic region and having at least one ceramic arranged between cathodic region and fluid to be examined, wherein the MET is configured to correlate at least one measurement value with at least one process parameter (P SB) based on processed measurement data; in particular a metrological device according to the present disclosure; wherein the metrological device is produced by enclosing the ceramic between an inner supporting structure implemented with pressure radially outwards and an outer supporting structure implemented with tensile stress radially inwards, in particular with the outer supporting structure acting as a current collector, optionally with at least one of the inner and outer supporting structures as an integral component of cathode and / or anode, wherein the ceramic is / is advantageously provided in a configuration as an at least sectionally cylindrical body, in particular tube, with a geometrically at least approximately cylindrical structure between anode and cathode, wherein the enclosing preferably forms a three-component membrane-electrode assembly with ceramic and electrodes in each case in full lateral contact. This not least provides a simple, robust, cost-effective configuration which can also be implemented for a plurality of measurement points without the costs or the outlay of the entire measurement system increasing disadvantageously.The aforementioned object is also achieved by a computer program product comprising instructions which, when the computer program product is executed on a computer or a metrology device or a metrology system, cause these / s to execute steps for controlling / regulating a / the method described here on the computer, in particular computer program product configured to generate at least one energetic / electrochemical parameter from measurement data collected over an evaluation period of at least 30 days by means of at least one metrology microbial electrochemical technology unit which comprises active ceramic arranged between the cathodic region and the fluid to be examined, wherein at least one measurement value is correlated with at least one process parameter (P SB) in particular measurement data from cell-internal resistance components and / or voltage, capacitance, current, power and / or electrical charge measurement data; In particular, it is detected / determined based on measurement data by means of a metrological device according to the present disclosure and / or by means of a / the method described here. On the basis of the aforementioned advantages, this also enables application-specific utilization of target variables or process parameters, whether determined on the basis of measurement data by means of a single measurement device, or determined on the basis of measurement data by means of a plurality of measurement devices with respect to a plurality of measurement points. For example, the following measures are / are implemented via a wireless communication solution such as a cloud: front end (user interface or the page of a software or application visible to a user and to be operated by the user) and back end (server and logic), and / or provision of an application (app) or website for data visualization.For example, based on the components described here, a system with platform functionality is provided, which is configured to realize the data correlation and evaluation and reproduction described here, in particular via a graphical user interface (e.g. in the manner of a dashboard), for providing at least one mobile monitoring function for at least one user, in particular in such a way that a user can run with a terminal via a (clarifying) plant and in each case the respective data is displayed on a measurement point-specific basis, e.g. during the passage past the individual basin or sensors or metrological devices, for example in an approach / position-related manner. The platform can be / are provided, for example, by a cloud-like information-technology infrastructure or architecture. The skilled person can specify, based on the present disclosure, which system components are to be implemented locally at a respective measurement point, and / or on the server side and / or software-based via a computer program (product).The aforementioned object is also achieved by a system with platform functionality, configured for data correlation and evaluation and reproduction, in particular via a graphical user interface, for providing at least one mobile monitoring function for at least one user, in particular with respect to approximation / position, in each case with respect to an individual one of a plurality of measurement points, at which measurement points in each case at least one metrological device according to the present disclosure for generating at least one energetic / electrochemical parameter from measurement data based on bioelectrochemical processes is implemented. This can also facilitate the use of the technology described here directly in the field, in particular by a respective plant operator, and / or in the context of (process) monitoring measures and / or control / regulation measures, in particular for (waste) water treatment, which respectively relate to the fluid to be examined. The system with platform functionality can also include a / the measurement system described here or at least be in communication therewith.The aforementioned object is also achieved by using a membrane electrode assembly in a metrological microbial electrochemical technology unit, MET, of a metrological device for generating at least one energetic / electrochemical (cell) parameter when collecting measurement data over a time duration (evaluation period) of at least 30 days, e.g. when collecting measurement data once a day, in particular when training at least one AI model based on at least 30 measurement data points collected over at least 30 days, wherein a / the at least one membrane component of the membrane electrode assembly is formed by a ceramic, wherein a / the cathode of the membrane electrode assembly is formed at least partially by an activated carbon-graphite conductive carbon black mixture or activated carbon fiber felt or granulated activated carbon or graphite felt, wherein a / the anode of the membrane electrode assembly is formed at least partially by a carbon-based carbon fiber fleece (or carbon veil) or graphite felt or activated carbon fiber felt, in particular with anode and cathode in each case in full surface area contact with the ceramic inner or ceramic outer surface area, wherein at least one measured value is correlated with at least one (organic / inorganic) process parameter (P SB) based on the measured data, wherein the at least one energetic / electrochemical (cell) parameter is generated from the measured data recorded over an evaluation period of at least 30 days, in particular from measurement data relating to cell-internal resistance components and / or from voltage, capacitance, current, power and / or electrical charge measurement data, in particular by means of a measurement device described above, in particular based on a measurement method described above. In this way, the aforementioned advantages can be realized, in particular with regard to optimizations substantially brought about by device technology for realizing a good long-term stability in combination with a high data quality. The cathode may optionally also comprise a current collector (e.g. metal mesh or carbon fibre fleece) and / or a gas diffusion layer (e.g. PTFE).It is to be understood that, especially in sewage treatment plants or in water treatment processes, COD and / or BOD have not yet been (can) measured daily, but only weekly, for example. Also with this possibly maintained rhythm, the present invention can be implemented advantageously. Offline calibration is thus advantageously provided, for example, in a laboratory, in particular in combination with measurements on site (in situ) at the sewage treatment plant, optionally extended by additional measurement brackets.It is also to be understood that the mode of operation of the MET described here can advantageously be checked against or further optimized by means of a reference electrode, in particular by anode and / or cathode being examined individually. In this way, an effect (e.g. deposits) potentially impairing the measurement can also be detected comparatively easily and can be taken into account comparatively easily during the evaluation, e.g. with regard to a greater long-term stability. For example, a measurement is simultaneously carried out by means of at least one reference electrode, in particular in the immediate vicinity of the (respective) anode.According to one exemplary embodiment, the metrological device is configured for a configuration of the MET as a two-electrode system, which is configured to be / are extended to form a three-electrode system, in particular with a / the third electrode in an implementation as a reference electrode. This not least facilitates further optimization and measurement safety, especially also during long-term operation. The reference potential of the electrodes is preferably measured via a parallel circuit. The potential between reference electrode and electrode can be measured. This is a voltage measurement, referred to here as potential measurement with reference to electrodes.In other words: The MET can be designed as a two-electrode system (expandable by at least one electrode) or optionally also directly as a three-electrode system, with the third electrode implemented as a reference electrode.It is to be understood that the device construction described here is advantageously not impaired by a reference electrode, but rather is merely supplemented thereby. For example, a two-electrode system is considered as standard (MET as a whole, both electrodes, i.e. anode and cathode, in combination with one another). By means of an optionally additionally implemented reference electrode, in particular in an implementation of the measurement device as a three-electrode system, a measurement can be carried out in the wastewater (advantageously close to the anode), for example, in addition to the MET or in addition to the actual membrane-electrode assembly. By means of additional potential measurements of the anode and the cathode, the electrodes can be examined individually, as a result of which an influence of the respective other electrode potentially influencing the measurement can be masked out. In combination with a reference electrode, particularly selective evaluation can be carried out, in particular when focusing on the anode (bacteria in the electroactive biofilm). A parameter determination routine may be / remain comparable to that of a two-electrode system, when anode or cathode are considered specifically. According to the present invention, the implementation of a reference electrode is provided as optional, in particular since it is to be ensured during operation that the reference electrode does not contaminate (whereas the anode and the cathode are not subject to this stringent requirement), which may not be ensured in a simple manner for all applications. In addition, the structure of the reference electrode may be relatively fragile (in particular due to glass bodies), which may also exclude some types of applications.The aforementioned object is also achieved by using a metrological microbial electrochemical technology unit, MET, of a metrological device for generating at least one energetic / electrochemical parameter when acquiring measurement data over an evaluation period (time duration) of at least 30 days, wherein the metrological microbial electrochemical technology unit has at least one active ceramic, in particular silicate ceramic, in particular clay ceramic, arranged between the cathodic region and the fluid to be examined, wherein at least one measurement value is correlated with at least one process parameter (P SB) based on the acquired measurement data, in particular with respect to the chemical / biological oxygen requirement (COD / BOD) and / or a carbon consumption rate and / or substance fractions of volatile fatty acids, generating the at least one energetic / electrochemical (cell) parameter from measurement data relating to cell-internal resistance components and / or voltage, capacitance, current, power and / or electrical charge measurement data, generating the at least one energetic / electrochemical (cell) parameter being carried out on the basis of modulation, in particular pulse modulation of the external electrical load resistance; wherein the metrological microbial electrochemical technology unit is used in the implementation of at least one sensor system from the following group: floor sensor system, water sensor system (sensor system for static water and / or flowing water sensor system), waste water sensor system in all-gmeins, aquaristics sensor system, channel sensor system, sensor system in the inlet upstream of sewage treatment plants or individual process stages (in particular anaerobic process stages), sensor system in the outlet downstream of sewage treatment plants in particular in the region of so-called prefluters or downstream of individual process stages, sensor system in at least one processual activation stage of a water treatment process, sensor system for detecting photosynthetic processes, sensor system for industrial and plant sewage treatment plants, groundwater sensor system; in particular by means of a metrological device described further above, in particular based on a metrological method described further above. In this way, the aforementioned advantages can be realized, in particular with regard to a particularly application-specific oriented manner of implementation or correlation. For example, the implementation of the measurement devices and methods described here for at least one process-related activation stage of a water treatment process also provides a high energy saving potential, in particular since the determinable information about the treatment process in combination with control / regulation measures promising a considerable energy saving, in particular since activation stages can certainly make up more than 50% of the total energy requirement of a treatment plant. In this context, energy consumption monitoring or a visualization of energy saving potentials associated therewith can also be implemented, in particular in conjunction with the measurement points described here.In this context, groundwater sensor technology is understood to mean, in particular, senory, by means of which level and / or quality and / or pressure and / or chemical groundwater parameters can be detected, in particular also nitrate. Since the COD in groundwater is usually very low, the MET described here is advantageously equipped with at least one MEZ (MET consisting of or comprising at least one MBZ and at least one microbial electrolysis cell, MEZ) for such an implementation.Summary: Microbial (metrological) fuel cells (MBZ) have hitherto received great cost-related challenges and great technical hurdles with regard to long-term stability, for example on account of what are known as scaling effects, in particular also in (waste) water treatment processes. However, a durable evaluation, in particular of the chemical and / or biological oxygen demand (COD / BOD), which can be loaded would also provide great advantages in the context of plant and process control / regulation. The present invention overcomes the disadvantages to date, in particular in that, on the one hand, a construction with a device technology with very good long-term stability is provided, and in that, on the other hand, metrological evaluation and correlation measures are shown which improve the data basis, the data quality and also the computer-assisted evaluation, in particular by means of self-learning algorithms. In particular, the present invention provides a measurement device having the following features: Measurement microbial electrochemical technology unit having a cathodic region, logic unit having at least one microcontroller, active ceramic with separator function arranged between the cathodic region and the fluid to be examined between the electrodes (anode, cathode), wherein the measurement device is configured by means of the ceramic and the electrodes to generate the at least one energetic / electrochemical parameter from measurement data recorded over an evaluation period of at least 30 days. The present invention is also in the context of implementing a computer program product for a corresponding metrological method for generating at least one energetic / electrochemical parameter from measurement data, collected by means of at least one such metrological microbial electrochemical technology unit based on bioelectrochemical processes, preferably with the inclusion of modulation and / or self-learning algorithms, and in the context of implementations of such metrological apparatus or methods in the context of processual control / regulation measures, e.g. in water treatment. The present invention also relates to a correspondingly configured computer program product and uses of membrane electrode assemblies in metrological microbial electrochemical technology units of such metrological devices, wherein a / the at least one membrane component of the membrane electrode assembly is formed by a / the ceramic, wherein a / the cathode of the membrane electrode assembly is preferably formed by an activated carbon-graphite conductive carbon mixture or activated carbon fiber felt or granulated activated carbon or graphite felt, wherein a / the anode of the membrane electrode assembly is preferably formed at least partially by a carbon-based activated carbon fiber felt or carbon fiber fleece or graphite felt.BRIEF DESCRIPTION OF THE FIGURESThe invention is described in more detail in the following drawing figures, wherein reference numerals that are not explicitly described in a respective drawing figure are referred to the other drawing figures. They are shown in schematic or qualitative representation: FIG. 1 shows a sectional side view of the structure of a metrological microbial electrochemical technology unit (MET) of a metrological device according to exemplary embodiments; FIG. 2 shows a sectional side view of the structure of a membrane electrode assembly of a MET of a measurement device according to exemplary embodiments; FIGS. 3A, 3B, 3C are two perspective views and a sectional view of components of a metrology device according to exemplary embodiments; FIG. 4A shows a visualization of the long-term stability or data quality that can be achieved by means of a metrology device according to exemplary embodiments or a metrology method implemented accordingly, with reference to voltage, current and power density profiles over time, or with reference to polarization and power density curves; FIG. 4B shows a further material test with regard to ACFF material, comparable to that according to FIG. 4A, for a measurement device according to exemplary embodiments or for a measurement method implemented accordingly, in particular for verifying the long-term stability or data quality that can be achieved, in particular based on a membrane electrode assembly with activated carbon-graphite conductive carbon mixture, with reference to a comparison of polarization and power density curves of two materials; FIGS. 5A, 5B, 5C show a representation of cell voltage, resistance or electrical charge profiles over time (or of system responses in the case of frequency connection and disconnection), with regard to a measurement-technology evaluation according to exemplary embodiments; FIG. 6A shows an electrical engineering design of a simplified equivalent electrical circuit for metrology devices according to exemplary embodiments and correspondingly implemented methods; FIGS. 6B, 6C show a comparison of measured and simulated data, according to embodiments; FIGS. 7A, 7B, 7C show a comparison of the temporal profile of electrochemical parameters for verification of a measurement-technology real-time determination according to exemplary embodiments; FIG. 8 shows steps of a measurement method, which can be carried out by means of measurement apparatuses according to exemplary embodiments, and optionally intermediate and / or downstream measures; FIG. 9 shows a balancing relationship for the COD relating to the non-inert components, with reference to a so-called BOD respiration measurement for determining the reaction constant (kBSB) and the biodegradable COD fraction, for implementation in the context of metrological devices according to exemplary embodiments of the present invention and correspondingly implemented methods, in particular for the purpose of realizing a metrological or analytical fractionation of the COD (advantageously real-time fractionation); FIGS. 10A, 10B show a further embodiment of a structural structure of a measurement device according to exemplary embodiments; FIG. 11 shows a system with platform functionality, comprising at least one metrological device according to exemplary embodiments, in communication with a system for water treatment, for example.DETAILED DESCRIPTION OF THE FIGURESThe invention will first be explained with general reference to all reference numerals and figures. Special features or individual aspects or aspects of the present invention that are easily visible / representable in the respective figure are individually the subject in connection with the respective figure.A metrological device 10 or a suitably implemented metrological method for generating energetic / electrochemical parameters based on measurement data relating to a fluid F to be examined, for example (waste) water containing organic wastes 1 or the like, is provided, wherein a metrological microbial electrochemical technology unit (MET) 11 is provided with a cathodic region 11.1, 12b (sealed off / separated from fluid to be examined), in which a membrane electrode assembly 12 separates an anodic region 12a (in contact with fluid to be examined) or an anode 12.1 and a cathodic compartment 12b or a cathode 12.3 by a ceramic 12.2, in particular silicate ceramic, in particular clay ceramic, advantageously with an at least approximately tube-cylindrical basic shape of the ceramic with a ceramic outer surface 12.21, on which one electrode comes to rest, and a ceramic inner lateral surface 12.23 on which the other electrode comes to rest. A / the membrane or the membrane component 12.7 of the membrane electrode assembly 12 can accordingly be provided or ensured by means of the ceramic, wherein the ceramic fulfills a / the separator / membrane function. Optionally, the metrology device 10 comprises communication module 17 for uni- or bi-directional wireless communication (data transmission), e.g. for energy consumption-optimized near field communication and / or for mobile radio communication. The latter type of communication may be considered to be a particularly robust communication type, in particular in the context of installations or processes which are to be included in the critical infrastructure.It is to be understood that within the scope of the investigations according to the invention it has been shown that a ceramic with a comparatively high SiO2content can be expected to have a particularly advantageous characteristic, wherein the selected SiO2content may also be in the context of a respectively selected porosity and / or thickness. Example: a comparatively high porosity (e.g. in the range of 25-35%) may allow an increase in performance with increasing thickness of the ceramic, whereas a comparatively low porosity (e.g. in the range of less than 10% to 15%) may result in a decrease in performance with increasing thickness.At least one such measurement device 10 can be part of a measurement system 20 with a database 21 and a computing unit 22, wherein the measurement system 20 can comprise sensor systems 30 implemented / implementable in an application-specific manner, in particular at least one sensor system component from the following group: floor sensor system 31, water system sensor system 32, wastewater sensor system 33, aquatic sensor system 34, channel sensor system 35, sensor system 36 ain the inlet upstream of sewage treatment plants or individual process stages, sensor system 36 bdownstream of sewage treatment plants (e.g. preflux or downstream of individual process stages, in particular also in the inlet to the activation stage or in the outlet of the preclean basin), sensor system 37 in at least one process activation stage, sensor system 38 for detecting photosynthetic processes, sensor system 39 for industrial and plant sewage treatment plants, groundwater sensor system. In particular, the sensor system component provides for the detection of environmental data such as the temperature. Depending on the type and manner of the technical device implementation, the respective sensor system component may also comprise a metrological device or may be connected thereto by measurement technology. Optionally, the metrology device 10, the metrology system 20 and / or the respective sensor system component 30 can be equipped with a communication module. The respectively optimal device-technology configuration specific to the application with regard to assemblies 10, 20, 30 and their components can be implemented by the skilled person.For example, the measurement method described here is / is implemented within the scope of monitoring or also controlling / regulating an (ab) water treatment plant 100 (FIG. 8 ), wherein the generated data or process parameters or manipulated variables are transmitted via at least one communication module 102 and are supplied, for example, to a control / regulating unit 101 of the plant.The focus of the analysis described here may be the biological / chemical oxygen demand BOD / COD (especially also the biodegradable COD parameter, BCD or C_CSB, abb), in particular in water treatment processes, although the correlation described here may also be implemented in connection with the analysis of the carbon consumption rate CCR and / or the analysis with respect to substance fractions of volatile fatty acids.In the following, specific features of the invention are explained with reference to individual figures or exemplary embodiments, wherein the ceramic (component) 12.2 is also represented together with the reference sign 12.7, namely when / where the ceramic is installed at least substantially in one function as membrane component 12.7. The ceramic 12.2 can also form, for example, sections of the reactor body or chassis, in which region the ceramic does not necessarily fulfil a separator / membrane function.FIG. 1 shows a basic structure of the MET 11. The ceramic membrane component 12.2, 12.7 is installed in surface-area contact between the electrodes 12.1, 12.3. The chassis 12.6 (or the reactor body) is shown here in a separate arrangement from the ceramic 12.2; optionally, the ceramic 12.2 can merge into the chassis 12.6 or form the chassis 12.6 at least partially, in particular in the base region between the electrodes. It is to be understood that the component 12.6 here represents only schematically the mode of operation (in the manner of a frame), i.e. the component 12.6 can also be configured differently from a constructional point of view. Microbes 3 are applied to a / a bioreceptor (plane) 11.3 at the anode of the MET 11 and are decomposed by biochemical processes in particular into H + and CO 2 and smaller molecules 5, wherein the region of the anode also functions as a transducer 11.5. In other words, once the anode comes into contact with waste water, a biofilm is formed which contains exoelectrogenic bacteria, among others. The bacteria metabolize degradable organic wastewater constituents (analyte) to electrons, CO2, protons (H+) and smaller molecules. The anodic biofilm functions as a bioreceptor. The anode electrode is thus a type of sensory transducer with the function of providing conversion to a measurable electrical signal, i.e., a signal relating to current, voltage, power. Via a microelectronic module 11.7 (preferably includingSoftware / firmware and soft sensor function) with microcontroller 16.1 can be used to / evaluate the measurement data. The microelectronic module 11.7 can be a component of a logic unit 16, which is optionally also connected to an energy storage unit 15.In the following FIGS. 2 and 3, components of the membrane electrode assembly are described in more detail, in particular catalyst layer 12.31, current collector 12.32 (in particular with metal mesh), support structure 12.4, wiring or reinforcement 12.5 (in particular stainless steel wires), chassis or reactor body 12.6 (optionally likewise made of ceramic, at least partially).FIG. 2 illustrates the basic layer structure of a / the membrane electrode assembly of a MET ( 11) or metrology device ( 10) described here, largely independently of a specifically selected / selectable geometric configuration of the ceramic component 12.2 (in particular also with or without chassis involvement). The fluid to be examined is present in the anodic region 12 a(i.e. on the outside), and the cathodic compartment 12 bis sealed off or separated by the ceramic 12.2. Anode 12.1 is advantageously formed from at least one component from the following group: carbon-based carbon fiber fleece (or carbon veil), graphite felt, activated carbon fiber felt. The cathode 12.3 is advantageously formed in two layers, namely by a catalyst layer 12.31 contacting the ceramic 12.2 over the surface of the shell (preferably of at least one component from the following group: activated carbon-graphite conductive carbon mixture, activated carbon fiber felt, granulated activated carbon, graphite felt) and a current collector layer 12.32 arranged radially outside thereof. This structure can also be described as follows: The cathode is arranged in the interior space defined by the ceramic; if activated carbon fiber felt, for example, is used as catalyst, it is arranged on the inside of the ceramic, and the current collector layer is then placed thereon, for example in the form of a stainless steel woven fabric. When referring to the ceramic, "inside" advantageously means directly on the inner surface (relating to the arrangement of the felt), and "outside" means the radially opposite direction for the current collector. It is to be understood that the current collector can optionally be omitted, in particular when using activated carbon fiber felt. For example, the electrodes are constructed such that the activated carbon-graphite conductive carbon mixture is pressed onto / into the stainless steel fabric; in particular in such a configuration, no additional radially arranged current collector layer needs to be provided. The electrodes 12.1, 12.3 each rest against a ceramic outer lateral surface 12.21 or ceramic inner lateral surface 12.23 of the ceramic membrane component 12.2, e.g. with a surface area portion of at least 60% or at least 70% (or even a higher minimum threshold value) of the entire surface area of the respective electrode that can be used by measurement technology. In this case, the device-related boundary conditions, in particular the relative position of the components of the ceramic electrode assembly or the contacting surface proportion, can be kept comparatively constant with respect to maximum possible constant operating boundary conditions, for example by means of a tensile / compressive prestress force measure, in particular for the purpose of maximizing the data quality and possible AI-based evaluations even in long-term operation.FIG. 3 shows an exemplary embodiment with a membrane electrode assembly or ceramic electrode assembly 12 of at least substantially cylindrical configuration, wherein in this exemplary embodiment a casing 13 with an air inlet 13.1 projecting in the manner of a sleeve, for example up to the region of the anode, and a cover 14 (in particular designed as protection against rain or weathering influences) with fastening means 14.1 (in particular screws in combination with spacer sleeves) are also provided. It is to be understood that individual at least the structural components of the measurement device can also be designed as 3D-printed components, for example a sensor body (without the MBZ as such) in combination with a screen for protecting the cathode from environmental influences (precipitation, UV radiation, and the like); for example, laterally provided air holes for continuously supplying the cathode with oxygen in combination with a cable feedthrough provided at the top of the screen (for cables to the evaluation unit or to microcontrollers and microelectronics) can be designed in 3D-printed form. FIG. 3A shows the metrology device 10 with housing 13 and cover 14, wherein the housing 13 is illustrated in a cut-away manner, in particular in order to clear the view of the anode. It is to be understood that the functional components air inlet 13.1 and cover 14 can also be incorporated in a different structural manner than shown in the figures, e.g. in an embodiment manufactured in additive manufacture, in particular 3D pressure manufacture, i.e. without screw connections or similar connection / fastening means. In other words: the structural design of the sensor body can be adapted in an application-specific manner, for example also by combining a plurality of the components shown to form integral components. Based on the present disclosure, the skilled person can make design variations without the method of functioning described here requiring a new design. The housing 13 or the sections thereof which cooperate with the components located further inwards can also be referred to here as clamping region; in this region, the transition between ceramic component and sensor body can be realized in a constructional manner. For example, a cable feedthrough is used to clamp the ceramic. Optionally, the ceramic can be equipped with a thread, so that a force-fit / form-fit transition to the reactor body can be ensured by means of a screw connection. In FIG. 3B, the cylindrical structure in this exemplary embodiment is specifically shown. FIG. 3C shows, on the one hand, the pot-like structure of the ceramic 12.2 comprising the membrane 12.7 and the chassis component 12.6, and, on the other hand, the cylindrical shell surface structure of the electrodes 12.1, 12.3. In FIG. 3, r; z denotes the radial direction and the vertical axis or perpendicular direction, corresponding to an exemplary orientation of the membrane electrode assembly in the fluid to be examined.With reference to FIG. 3, the following device aspects can also be explained: the metrological device 10 has at least one opening to the cathodic region for air / oxygen exchange, so that the mode of operation of the MET is ensured, wherein oxygen concentration fluctuations in particular in the cathodic region are largely negligible, in particular since it can be shown that the MET remains functional down to approximately five vol.-% oxygen without any noticeable losses in quality (an oxygen concentration in the range of at least 15% is expected to be established in the cathodic region depending on the design). It is to be understood that the dissolved oxygen in the catholyte is already sufficient for the oxygen reduction reaction to take place, i.e. <9 mg / L (saturation concentration at an O2 partial pressure of 0.21 atm. at 20° C.). This also allows for variations in the implementation of the metrology device including a liquid catholyte MBZ instead of an air cathode MBZ.It is to be understood that for an optimized mode of operation, a preferably completely flat contact of anode and cathode on the corresponding ceramic surface is advantageous. For this purpose, the present invention provides, in particular, for an inner supporting structure implemented with pressure toward the (radially) outside to be installed on the inside of the cathode and an outer supporting structure implemented with tensile stress toward the (radially) inside (in particular designed as a reinforcement or wiring) to be installed on the outside of the anode, wherein the outer supporting structure advantageously also performs the function of a current collector. Depending on the structural implementation, however, such supporting structures can also be designed as an integral component of cathode and / or anode.The skilled person recognizes based on the present disclosure that the highest possible contacting surface area proportion is desirable, and that this can be improved, e.g. supported by tensile / compressive forces in terms of device technology, or also by slight overdimensioning of "fits". Alternatively, a ceramic base body can also be remachined for the purpose of achieving better tolerance values, for example by remachined, for example ground, the inner and / or outer lateral surface with respect to cylindrical roundness. It is to be understood that in the context of the present invention, for the purpose of improving the long-term stability, it is of interest to keep the device-related boundary conditions as constant as possible, and this also relates to the relative position of the components of the ceramic electrode assembly. In other words: with regard to the maximum possible constant operating boundary conditions, it is to be avoided that the relative position of the respective electrode relative to the ceramic changes over time, or that the contacting surface area portion fluctuates.The provision of a / the chassis component 12.6 by means of the ceramic 12.2 as indicated in FIG. 3C is to be regarded as optional. Advantage: good rigidity and good tightness, in particular in the case of a tube-like / cylindrical configuration of the ceramic bridge 12.2 between anode and cathode. Of course, the ceramic can also be designed to be slightly conical.In particular in the context of the exemplary embodiments shown in the figures, the following functional example can also be explained in addition, in particular with a view to the long-term stability according to the invention, with a selection of material / chemicals specifically made here: anode: anode with carbon / carbon haze (20 g / m2);Cathode: activated carbon;Membrane (component) and optionally also chassis: ceramic, in particular starting from a sound pot base body;Chemical selection: ammonium acetate (C2H7NO2) as nitrogen and carbon source, and disodium hydrogen phosphate x2H2O (Na2HPO4 - 2H2O) as buffer and phosphorus source;Operation: batch operation using the same anolyte (see Table [1] below) addition / feed cycle: 2x per week;A batch operating cycle is understood here in particular to mean the cyclic substrate exchange for the purpose of setting predefined experimental conditions.Table [1] Anolyte composition Table [1] Anolyte composition727 mgN / L3274 mg / L (3493 mgCO / L)873 mgP / LFIG. 4 illustrates results of long-term tests for different membrane electrode assemblies, the cell voltage (ordinate on the left) and the power density (on the right) being plotted against the current density (abscissa). Edge Note: The curves shown in FIG. 4 may be generated based on the so-called varying circuit resistance (VCR) technique.FIG. 4A illustrates, by way of example, a profile of the power density, wherein a permanently stable process is established, in particular also with respect to catholyte households. Here, "PD" in the legend in FIG. 4A stands for the power density (curves), and "Poli" stands for the polarization (curves).It is seen from FIG. 4A that a drop in power density does not occur. Rather, the performance seems to increase, which can be attributed to an increased biofilm activity. FIG. 4 provides further evidence for the long-term stability described here, here with reference by way of example to 136 days continuous operation (it being understood that a detectably comparable curve profile can also be realized over a duration of more than 200 days): Direct contact of the cathode with waste water can be avoided in particular by the ceramic component, advantageously installed as a membrane. The catholyte formed can ensure constant moisturizing of the cathode, in combination with continuous removal of salts. The scaling phenomenon that has occurred hitherto in the prior art can be significantly reduced or largely avoided. FIG. 4 also provides an underlying wall to the functionality of MBZ or MET which is implemented comparatively economically from a device-technical point of view. A significant performance differential is not seen compared to laboratory MBZ (equipped with relatively expensive graphite fiber brush anodes and gas diffusion cathodes). The internal cell resistance (Rint) can be determined on the basis of the polarization curve. This successively decreases from 122 ohms (REF) to 118 ohms (122d), 94 ohms (136d), and ultimately to 85 ohms (in this example after 206 days). This is also a confirmation of the long-term stability described here, in particular since salt deposits would lead to a significant increase in the internal resistance.In FIG. 4B, two specific material combinations for the membrane-electrode assembly are examined in more detail. In particular, it is shown that the materials described here of the membrane electrode assembly of the MET can generally be implemented advantageously for the applications described here of the MET or of the measurement device, in particular the material combination ceramic (separator) and activated carbon-graphite conducting soot mixture (for at least one electrode, in particular for the catalyst). It can be seen that activated carbon fiber felt, ACFF (used as anode and cathode) can provide comparable performances to carbon veils for use as anode and activated carbon-graphite conductive carbon mixture for use as cathode. Power densities >150 [mW / m2 Cat] can be ensured without problems. In FIG. 4B, the abbreviation ACFF used here stands for "Activated Carbon Fiber Felt", i.e. for activated carbon fiber felt, and the abbreviation CV stands for "Carbon Violet", i.e. for carbon veil, and the abbreviation AC stands for activated carbon-graphite guide carbon mixture.In FIG. 5, the context of a routine for uninterrupted parameter estimation, which can be implemented within the scope of the present invention, is visualized by schematic representation of a system response (current and voltage change) caused by frequency / frequency switching off and on (connecting / disconnecting) the external electrical load resistor (R-PWM), at high and low frequencies. The evaluation of the voltage profile, in particular resulting from the modulated load resistance, can lead to the determination of the internal cell resistances, the capacitance and the open circuit voltage. FIG. 5A shows the curve of the cell voltage. In FIG. 5B, the curve of the resistance is reproduced; the upper dotted line stands for the level R →∞( circuit, i.e. there is a theoretically infinitely large resistance), and the lower line stands for the level of the load resistance R load. In FIG. 5C, the course of the electric current flow is reproduced; the stored charge corresponds to the area under the curve marked by the reference line; the determination of the cumulative electric charge can therefore be carried out with reference to the area which corresponds to the summed current over the time of discharge of the capacitor (or of the biofilm) (represented by the area correspondingly marked in FIG. 5C ). In the context of the discussion of FIG. 5, a simplified Randle circuit (or circuit) may be assumed or used as the basis. A model-based parameter determination routine can thus be realized, in particular by analytically solving the assumed circuit model and determining the corresponding parameters with the aid of the voltage profiles. For the sake of completeness, it should also be mentioned at this point that it is also possible to determine the concentration resistance.FIG. 6 illustrates a verification of simulation and measurement in the context of a system response generated by selective opening and closing of the external electrical circuit. In FIG. 6A, a simplified equivalent electrical circuit is shown (circuit model of a MET), wherein R act stands for the activation resistor and C dl stands for double-layer capacitance (Double-layer capacitance), and R ohmic stands for the ohmic resistor.FIG. 6B shows a system response (change in the voltage profile) at comparatively high (switching) frequencies, wherein FIG. 6C shows a system response at comparatively low frequencies (measured and simulated system response or voltage change caused by switching off and on the external electrical load resistor at high and low frequencies). A parameter determination can be made from these voltage profiles on the basis of the equivalent electrical circuit (in particular Rohmic, Ract, Cdl, electrical charge, open-circuit voltage). In FIGS. 6B, 6C, the solid line corresponds to the simulated curve, and the points marked with rectangles (or at numerous points, respectively, correspond to measured data(points). It can be seen from FIG. 6 that the system response (here: represented by the cell voltage) can be triggered by selective opening and closing of the external electrical circuit at high frequencies (100 Hz, 80% DC) and low frequencies (0.02 Hz, 80% DC). The evaluation of the voltage profile enables a comparatively exact determination of electrochemical parameters. For this purpose, a simplified equivalent electrical circuit (simplified Randles Circuit, ECM for short) can be used, in particular in the context of a mathematical description of the generated voltage profile. Electrochemical parameters can be determined, for example, the ohmic resistance, the activation resistance, the open circuit voltage, the cell capacity, the current density, the power density, the electric charge, in particular based on an analytical solution of the model. The quality of the parameter determination routine and of the ECM can be checked, in particular on the basis of a comparison between simulated and observed voltage profile. Here, a comparatively low root mean square error (RMSE) of only 4.94 mV can be achieved (rel. RMSE=1.7%), i.e. the comparatively greatly simplified model approach described here proves to be adequate to map both the fast and the slow electrical dynamics with good measurement / data-technology load capacity. This parameter determination routine (in particular electrochemical impedance spectroscopy (EIS) and the so-called current interruption (CI) method also stands for a comparison with conventional electrochemical methods; however, these two methods are tied to the presence of a potentiostat, which is extremely cost-intensive and also does not allow an investigation in the course of operation); this approach can also be verified in this respect.FIG. 7 shows a visualization of a real-time determination of electrochemical parameters and a substrate dependence, in particular by reference to the development over time of electrochemical parameters of a MET operated in batch mode and by comparison of the measured cell voltage and simulated (based on the equivalent electrical circuit model). The time profile of electrochemical parameters during a batch cycle is dependent on the substrate consumption (decreasing COD concentration). The activation resistance, which is directly related to the metabolic activity of the bacteria, increases after about two and a half days (from 15 ohms to >150 ohms), see Figure 7A. In contrast, the ohmic resistance shows only slight changes, which can be attributed to only a slight change in the conductivity (the decrease in the conductivity being attributed to a decreasing acetate concentration). Analogous to the activation resistor, only reciprocally, it behaves with the open circuit voltage. This drops from 400 mV to 100 mV after a constant course of two days. In this case, the course of the cell capacity during the batch cycle shows fluctuations which are directly linked to the biofilm density and reflect fluctuations in the microbial activity. The continuously decreasing trend of the capacitance can be explained by the dependence of the capacitance on the potential or the likewise decreasing current density. In FIG. 7A, the resistance is shown over time, the dark comparatively constant line representing the curve of the ohmic resistance, and the brighter comparatively discontinuous line representing the curve of the activation resistance. In FIG. 7B, voltage and capacitance are shown over time, with the dark line at the top representing the curve of the open circuit voltage, and the lighter line at the bottom representing the curve of the double layer capacitance. The downward pointing arrows on the curves of FIGS. 7A, 7B indicate the times of a refilling with substrate (batch operation).Double layer capacitance is understood to mean that in MBZs the conversion of chemical energy into electrical energy is the result of intrinsic electrostatic (capacitive) and irreversible electrochemical (faradaic) processes. Faradaic current is related to the release of electrons at the anode during anaerobic oxidation of organics by EABs. In the open circuit, the accumulated electrons are responsible for the formation of the electric double layer (EDL) at the anode / electrolyte interface, where the negative surface charges (e-) are balanced by counterions (cations) present in the wastewater. The same process, but with the polarity reversed, takes place at the cathode. The EDL acts as a capacitor in which current can be stored and is responsible for the capacitive current. When the circuit is closed, the anode simultaneously provides the capacitive current (electrons released from EDL formation) and the faradic current, i.e., the current generated by EABs. The total electric current generated accordingly corresponds to the sum of capacitive and faradaic current.In FIG. 7C, the visualization of the real-time determination of electrochemical parameters and of the substrate dependence is also carried out with reference to the electrical charge (in addition to the measurements shown in FIG. 7B ), when comparing measured and simulated cell voltage. In FIG. 7C, the graph at the top left shows the profile of current (instantaneous) cell voltage (relatively darker line) and voltage of the open circuit (relatively lighter line); in the graph at the top right shows the profile of ohmic resistance (relatively darker line) and activation resistance (relatively lighter line); in the graph at the bottom left shows the profile of double layer capacitance (relatively darker line) and cumulative electric charge (relatively lighter line); in the graph at the bottom right a comparison between measured values (relatively darker line) and simulation (relatively lighter line) is shown. The measured cell voltage is compared with the simulated cell voltage. Both the electrochemical parameters determined and the assumed circuit model can be verified; if the measured voltage can be well calculated, it is assumed that both the model and the parameter determination routine have been adequately implemented. FIG. 7C also shows that the assumed simplified equivalent electrical circuit (ECM) is suitable for the context of the present implementation, and that the parameter determination routine provides correct results (the measured cell voltage may be modeled comparatively accurately based on the ECM and the determined parameters). Specifically, in the example shown, the RMSE is even only 3.3mV.FIG. 8 illustrates a method for generating at least one energetic / electrochemical parameter from measurement data acquired by means of at least one metrological microbial electrochemical technology unit (MET) based on bioelectrochemical processes, for example having the steps: step S 1 data acquisition; step S 2 data evaluation; step S 3 modulation; step S 4 data analysis, in particular based on ML algorithms; step S 1 comprises in particular acquiring measurement data by means of at least one MET based on bioelectrochemical processes; step S 2 comprises in particular correlating at least one measurement value with at least one process parameter; In this case, at least one energetic / electrochemical parameter can be generated from the measurement data recorded over an evaluation period of at least 30 days, in particular measurement data from cell-internal resistance components and / or voltage, capacitance, current, power and / or electrical charge measurement data. Steps S 3 and / or S 4 are also optionally implemented.It is to be understood that step S 1 can be preceded by an initial calibration step, in particular in the sense of a basic calibration, wherein at least one ML algorithm can be used for the calibration. This calibration step or further calibration steps can also be carried out in addition at other times or method steps.The diamond-shaped fields "R 0" between the individual steps indicated in FIG. 8 illustrate possible application-specific adaptation or implementation measures for the person skilled in the art (intermediate measures), in particular between steps S 1 and S 2, for example by at least one ML algorithm being adapted and / or extended (or generally selection of the respective process parameter, defining correlation partners). In addition, application-specific adaptation or implementation measures can be provided after step S 2 and / or after step S 3 and / or after step S 4 (downstream measures "R 1"), e.g. the generation or the transmission of manipulated variables C i of a process to be controlled / regulated, in particular a water treatment process, and / or other control / regulation parameters.In other words, according to step S 1, data acquisition or bioindication can take place, wherein a bioelectric signal is generated (biocurrent). According to step S 2, the determination of the microbial activity can then take place, wherein from step S 2 a control variable / controlled variable can be used for e.g. aerator assemblies or also sampling devices (e.g. in the context of event-related or event-driven sampling). Thus, according to R0, in a phase between steps S 1 and S 2, an implementation measure can be provided relating to a conversion of measured current values to the metabolism of the microorganisms. According to step S 3, a modulation can take place, in particular by electrochemical parameters being determined in addition to the energetic parameters (biocurrent, voltage, etc.). Thus, according to R0, in a phase between steps S2 and S3, a soft sensor system designed as a parameter determination routine (or mathematical model) can be implemented. Additional controlled variables (R1) or P_SB or P SB are then not necessarily provided. Thus, according to R0, in a phase between steps S 3 and S 4, a data analysis can be provided, in particular with reference to at least one ML algorithm. For example, an ANN is pre-trained (calibrated) and process parameters such as COD, BOD, TN, NH4-N, etc. are determined on this calibrated basis. These can then be used, for example, within the scope of a control / regulation process, for example, to specify the type of ventilation or also to control a sampling device.It is to be understood that the data output P SB indicated in FIG. 8 generally stands for data relating to at least one parameter, in particular can comprise data relating to the BOD, COD, BCD, to the CCR and / or further parameters.In FIG. 9, reference is made to the fact that a correlation of measured values with respect to a determination of the COD may also be in the context of BOD (or BOD biological oxygen demand), carbon consumption rate and substance fractions of volatile fatty acids, in particular based on easily concreteizable dependencies, for example also in a balancing manner. The C CSB,abb referred to in the German as "biodegradable COD" (BCOD), corresponding to the COD minus only the non-inert components, can be determined in particular on the basis of a / the exemplary relationship (BOD respiration measurement in the context of the absorption of CO2) illustrated in FIG. 9, wherein the points or circles illustrated illustrate the measurement points and wherein the curve illustrates the course determined therefrom. The abscissa indicates the unit time for the BOD1, BOD5, etc., etc., etc. The parameters K BSB( or k BOD) and f BSB( or f BOD) thereby denote the so-called first order rate constant and the so-called death or correction factor (in the range 0.1 to 0.2). BOD tot( or BOD tot) is the extrapolated BOD, calculable by including the time variables or time dependence (compare BOD t in the equation in FIG. 9 ). The abbreviations familiar in English language are reproduced here in brackets. In this case, the COD or COD (in particular in the case of wastewaters) is divided into the main fractions BCD and "non-biodegradable COD", and these two main COD fractions are divided into soluble COD and particulate COD, and the soluble BCD is further divided into VFA on the one hand and complex constituents on the other hand. Based thereon, the fractionation for analytical evaluation can be carried out, in particular also in real time. The most detailed possible breakdown or fractionation (in particular real-time fractionation) of the COD according to the invention can therefore also ensure a particularly high data quality and high load capacity of any (control) parameters obtained from the metrological analysis. It is accordingly also evident from FIG. 9 that the measurement technique described here can enable a comparatively simple determination of the BCD in an elegant manner, which has usually not been determined hitherto because of too high a cost, at least in the field or by plant operators (at most the BOD 5 is not determined in the field). The COD or COD in general can be determined in a chemical manner.It is noteworthy that the sensor and parameter selection based on the concept of the present invention can also be adapted according to a type of modular principle, for example as follows: 1) Measuring-technology device in basic design (basic sensor) for monitoring microbial activity (in the sense of a first expansion stage); 2) Basic sensor in combination with application-specifically implemented / implementable wastewater quality parameters (in the sense of a second expansion stage), wherein COD, BOD5, TN, NH4-N, etc. can be deduced by soft sensor system (with TN corresponding to the total nitrogen content in the sample under examination or in the wastewater); 3) Basic sensor in combination with implemented wastewater quality parameters, plus physical measurement sensor systems (temperature, pH, etc.), in the sense of a third expansion stage; In this case, for example, environmental influences can also be taken into account additionally (keyword: multiparameter probe), in particular for the purpose of increasing the accuracy of the measurement;In the context of FIG. 9, the so-called yield coefficient Y (or yield rate) is also to be mentioned once again at this point, via which, with reference to electron flow and electron balances or, for practical purposes, with reference to COD balances (with the COD as a measure of the available electrons), biomass produced and dissolved oxygen consumed can be balanced. The "true" yield coefficient, usually expressed in COD units, describes the amount of biomass formed per unit of degraded substrate. With reference to the yield coefficient, the proportion of electrons taken by biosynthesis and the proportion coupled to the electron acceptor (used for energy reactions) can be determined.It is to be understood that the relationships shown in FIG. 9 can also be used in particular within the scope of a (basic) calibration before or during the provision of a measurement device described here, in particular for providing / the functionality of the basic sensor (measurement device with basic equipment, configured for further application-specific implementation).Within the scope of the present disclosure, the symbol U is usually assigned to the voltage or cell voltage, U_MHZ is also assigned in the case of MBZs, and the current density is usually denoted by the symbol j. In addition, the specification is usually made as to which electrode surface the current density is referred to (usually to the cathode, since this is limiting). This then leads to the following designation: j_Kat.FIGS. 10A and 10B show a further exemplary embodiment for an advantageous structural design of the metrological device 10, in particular for applications in the field in which the device 10 is intended to be introduced into a basin, into a channel, into a body of water or the like. FIG. 10A shows a closed state with cover 14 (or protective screen) mounted on housing 13, e.g., with a screwed cover. FIG. 10B shows an exploded view of a / the disassembled protective screen 14 and the air inlets 13.1 located underneath.FIG. 11 shows a / the metrology device 10 (at least one metrology device 10) as a component of at least one / the metrology system 20, which is implemented in a system 40 having platform functionality with access to a graphical user interface 41 (or comprising the latter), in particular for evaluating and visualizing data generated in the context of the measurement technology described here. The platform or dashboard or similar visualization tool can also be accessible to an authorized user via any desired terminal, in particular via the computer program (product) described here or the corresponding user interface (human machine interface, HMI).. In this way, for example, a (waste) water treatment plant 100 can be controlled via the system 40 in the context of being controlled by a respective measurement device 10 or a superordinate measurement system 20, for example by communicating with its control / regulation unit 101, for example via a communication module 102. Likewise, data can also be received (bilateral communication), e.g. with respect to plant-specific online measurement data such as volume flow, conductivity, temperature.In the technical components of the measuring device shown in FIGS. 2 and 3 and 10 and 11, for example, (microelectronic components or data processing components are not shown in detail. In this regard, reference is made to the description relating to the further exemplary embodiments, in particular also to FIG. 1.List of reference characters1 organic waste or the like 3 microbes 5 molecules 10 metrology device 11 metrology microbial electrochemical technology unit (MET) 11.1 cathodic region 11.3 bioreceptor (planar) 11.5 transducer 11.7 microelectronic module 12 membrane electrode assembly 12 aodic region 12 bcathode compartment 12.1 anode 12.2 ceramic, in particular for partitioning the cathodic region 12.21 ceramic outer surface 12.23 ceramic inner surface 12.3 cathode 12.31 catalyst layer 12.32 current collector, in particular with metal fabric 12.4 support structure (inner support structure) 12.5 wiring / reinforcement, in particular stainless steel wires (outer support structure) 12.6 chassis, reactor body 12.7 membrane or membrane component 13 enclosure 13.1 air inlet 14 lid or cover 14.1 fastening means, In particular, screws in combination with spacer sleeves 15 energy storage unit 16 logic unit 16.1 microcontroller 17 communication module 20 metrological system 21 database 22 computing unit 30 sensor system comprising at least one metrological device 31 ground sensor system 32 water sensor system 33 waste water sensor system in general 34 aquatic sensor system 35 channel sensor system 36a sensor system in the inlet upstream of sewage treatment plants or individual process stages 36b sensor system downstream of sewage treatment plants 37 sensor system in at least one process activation stage 38 sensor system for detecting photosynthetic processes 39 sensor system for industrial and plant sewage treatment plants, groundwater sensor system. 40 system with platform functionality 41 graphical user interface 100 (waste water treatment plant 101 control / regulation unit 102 communication module BOD / COD biological / chemical oxygen demand F to be examined Fluid P SB process parameters in particular for the BOD / COD R0 regulation / adaptation (measures interposed in terms of process technology) R1 measures S1 steps S1 data acquisition S2 steps S2 data evaluation S3 steps S3 modulation S4 steps S4 data analysis in particular based on at least one ML algorithm C i manipulated variable of a process to be controlled PD power density (curve) PoI polarization (curve) ccrcarbon consumption rate BCOD of biodegradable COD parameter (also referred to as: C_CSB, ABB) Y yield coefficient, yield rate r; z radial direction; vertical axis or perpendicular directionReferences included in the specificationThis list of documents cited by the applicant has been produced in an automated manner and is only included for the better information of the reader. The list is not part of the German patent application or utility model application. The DPMA does not take any adhesion for any faults or omissions.Patent Literature citedU.S. Pat. No. 11,352,272 B2

[0004]

Claims

Measurement device (10) configured to generate at least one energetic / electrochemical parameter from measurement data based on bioelectrochemical processes, comprising at least one measurement microbial electrochemical technology unit (11) having a cathodic region (11.1) sealed off fluid to be examined, and comprising a logic unit (16) having at least one microcontroller (16.1) configured to process measurement data collected over an evaluation period, wherein the measurement device (10) is configured to correlate at least one measurement value with at least one process parameter (P SB) based on the processed measurement data, in particular with a process parameter (P SB) for the chemical / biological oxygen requirement (COD / BOD) and / or for a carbon consumption rate and / or for substance fractions of volatile fatty acids; characterized in that, the metrological device (10) having at least one active ceramic (12.2) arranged between the cathodic region (11.1) and the fluid to be examined as a component of the metrological microbial electrochemical technology unit (11), which separates the cathodic region (11.1) from the fluid to be examined, wherein the metrological device (10) is configured by means of the at least one ceramic (12.2) to generate the at least one energetic / electrochemical parameter from measurement data recorded over an evaluation period of at least 30 days, in particular measurement data from cell-internal resistance components and / or voltage, capacitance, current, power and / or electrical charge measurement data.Measurement device according to claim 1, wherein the at least one ceramic defines at least one membrane component of the measurement-related microbial electrochemical technology unit; and / or wherein the at least one ceramic is a component of a membrane electrode assembly of the at least one measurement-related microbial electrochemical technology unit, in particular in the manner of a full-surface intermediate layer or bridge between an anodic compartment / section / region and a cathodic compartment of the membrane electrode assembly; and / or wherein the at least one ceramic together with the electrodes respectively forms a / the preferably three-component membrane electrode assembly of the measurement-related microbial electrochemical technology unit in full-surface contact, preferably radially tension / compression force-biased; and / or wherein the at least one ceramic also at least partially defines a / the reactor body of the measurement-related microbial electrochemical technology unit; and / or wherein the at least one ceramic, in the case of a geometrically at least approximately cylindrical structure, is arranged between anode and cathode of a / the membrane electrode assembly of the at least one metrological microbial electrochemical technology unit; and / or wherein the electrodes of a / the membrane electrode assembly of the at least one metrological microbial electrochemical technology unit comprise at least one of the following materials: carbon-based carbon fibre fleece / veil, graphite felt, activated carbon fibre felt, in each case for the anode, and / or activated carbon-graphite conductive carbon mixture, activated carbon fibre felt, graphite felt, granulated activated carbon, in each case for the cathode, in particular with at least one of the electrodes in soft, flexible formulation, advantageously also hydrophilic formulation.The metrology device according to any one of the preceding claims, wherein the metrology device ensures a long-term metrology stability of at least two months, preferably of at least one year, in particular in that the at least one ceramic is effective against deposition.The metrology device according to any one of the preceding claims, wherein the at least one metrology microbial electrochemical technology unit is configured as a tubular sensor having a cathodic region accessible via a lid, wherein the lid preferably merges into a housing enclosing the at least one ceramic and the anode and cathode or the cathodic compartment.Measurement device according to one of the preceding claims, wherein the ceramic functions as a separator between anode and cathode.Measurement device according to one of the preceding claims, wherein the measurement-technology microbial electrochemical unit has a membrane-electrode assembly in which the ceramic is present as a membrane in a radially tensile force-biased arrangement with the anode and / or in which the ceramic is present as a membrane in a radially compressive force-biased arrangement with the cathode, in particular in such a way that a relative movement between corresponding electrode and ceramic is prevented, with the surface contact proportion remaining the same in a predefined manner.The metrology device according to any one of the preceding claims, wherein the metrology device is configured to detect the microbial activity, in particular via the carbon consumption rate.The metrology device according to any of the preceding claims, wherein the metrology device is configured to generate the at least one energetic / electrochemical parameter based on modulation, in particular pulse modulation, of the external electrical load resistance.The metrology device according to any one of the preceding claims, wherein the at least one microcontroller of the metrology device is configured to realize a modulation, in particular pulse modulation without a PC connection; and / or wherein the metrology device has a communication module configured to wirelessly transmit generated cell parameters.Measurement device according to one of the preceding claims, wherein the measurement device is configured to evaluate the energy / electrical parameters generated from the recorded measurement data, in particular measurement data from cell-internal resistance components and / or voltage, capacitance, current, power and / or electrical charge measurement data, based on modulation, in particular pulse modulation of the external electrical load resistance, based on at least one AI model, in particular by means of a / the microcontroller integrated into the measurement device without a PC connection.The metrology device according to one of the preceding claims, wherein the metrology device is configured to correlate the generated cell parameters with the at least one process parameter (P SB) taking into account at least one boundary condition from the following group: conductivity, temperature, pH value; in particular in / for a / n water treatment process.The metrology device according to any one of the preceding claims, wherein the metrology device is configured to generate the at least one cell parameter within a time period of at most five minutes, preferably at most two minutes.The metrology device according to any one of the preceding claims, wherein the metrology device is configured to correlate at least one measurement value with a process parameter (P SB) for a chemical oxygen demand (COD), in particular a water treatment process to be optimized; and / or wherein the metrology device is configured to correlate at least one measurement value with a process parameter (P SB), in particular COD, with reference to the biological oxygen demand (BOD), in particular a water treatment process to be optimized; and / or wherein the metrology device is configured to correlate at least one measurement value with a process parameter (P SB), in particular COD, with reference to substance fractions of volatile fatty acids, VFA.The metrology device according to any one of the preceding claims, wherein the metrology device is configured to fractionate the chemical oxygen demand, in particular to perform a real-time fractionation of the COD based on metrology.The metrology device according to any one of the preceding claims, wherein the metrology device is configured to correlate at least one measurement value with a process parameter (P SB) for the carbon consumption rate, in particular in a water treatment process to be optimized, in particular is configured to also determine a process parameter (P SB) for the chemical oxygen demand (COD) or the COD itself based on the carbon consumption rate.The metrology device according to any one of the preceding claims, wherein the metrology device is autonomous in terms of energy, in particular in that the at least one metrology microbial electrochemical technology unit independently covers the energy requirement and / or in that the metrology device is equipped with at least one means for generating energy, e.g. with at least one solar collector unit.The metrology device according to any one of the preceding claims, wherein the metrology device is energy-autonomous for electroless measurement, in particular in that the energy required for the operation of the metrology device is generated by the at least one metrology microbial electrochemical technology unit.Measurement device according to one of the preceding claims, wherein the measurement device comprises at least one sensor which generates measurement data relating to at least one fluid characteristic from the following group and is / is supplied in terms of energy via the measurement device, which is preferably autonomous in terms of energy: temperature, pH value, conductivity; wherein these measurement data relating to at least one fluid characteristic are preferably taken into account for correlating the at least one measurement value with the at least one process parameter.Measurement device according to one of the preceding claims, wherein the measurement device comprises a plurality of measurement-technology microbial electrochemical units, in particular in an at least singly redundant arrangement at / for the same measurement point, wherein the measurement device is configured for a cross-sectional measurement or mean value measurement over the plurality of measurement-technology microbial electrochemical units for the respective measurement point.The metrology device according to any one of the preceding claims, wherein the metrology device is configured / implemented for analysis or at least for detection of photosynthetic processes or soil moisture.Measurement device according to one of the preceding claims, wherein the logic unit is configured to evaluate measurement data based on machine learning, wherein cell parameters are evaluated to determine the chemical and / or biological oxygen demand and / or the carbon consumption rate and / or substance fractions of volatile fatty acids, which are / have preferably been generated based on modulation, in particular pulse modulation, of the external electrical load resistance of measurement data relating to cell-internal resistance components and / or voltage, capacitance, current, power and / or electrical charge measurement data, which measurement data are / have been recorded over an evaluation period of at least 30 days.The metrology device according to any one of the preceding claims, wherein the metrology microbial electrochemical technology unit is configured as a two-electrode system and is configured to be / are extended to form a three-electrode system, in particular with a / the third electrode in configuration as a reference electrode.The metrology device according to any one of the preceding claims, wherein the metrology device, in particular the metrology microbial electrochemical technology unit, has a basic calibration, in particular a basic calibration set by means of at least one ML algorithm.Measurement device according to one of the preceding claims, wherein the measurement device is designed as warning devices with a warning function, in particular with regard to toxic substances such as heavy metals, nitrates, antibiotics, in particular with implemented triggering of the warning signal as a function of at least one predefined threshold value being exceeded / undershot, for example in connection with or in the context of so-called flushing surges and / or (pump) operating failures.The metrology device according to any one of the preceding claims, wherein the metrology device is configured to preset, control or set a calibration of the metrology device based on the external load resistance, in particular preset at least one calibration setting of the metrology device by adjusting the external load resistance, in particular preset, in particular to expand a / the basic calibration setting, in particular a linear range of the calibration.Measurement device (10) configured to generate at least one energetic / electrochemical parameter from measurement data collected over an evaluation period of at least 30 days based on bioelectrochemical processes, comprising at least one measurement microbial electrochemical technology unit (11) having a cathodic region (11.1) and having at least one ceramic (12.2) arranged between cathodic region (11.1) and fluid to be examined and configured to correlate at least one measurement value with at least one process parameter (P SB) based on processed measurement data; in particular measurement device according to one of claims 1 to 25; wherein the metrological device is produced by enclosing the ceramic between an inner supporting structure implemented with pressure radially outwards and an outer supporting structure implemented with tensile stress radially inwards, in particular with the outer supporting structure acting as a current collector, optionally with at least one of the inner and outer supporting structures as an integral component of cathode and / or anode, wherein the ceramic is / is advantageously provided in a configuration as an at least sectionally cylindrical body, in particular tube, with a geometrically at least approximately cylindrical structure between anode and cathode, wherein the enclosing preferably forms a three-component membrane-electrode assembly with ceramic and electrodes in each case in full lateral contact.Water treatment installation (100), having at least one metrological device (10) according to one of the preceding claims, or at least configured to be in data communication therewith, and having a control / regulating unit (101) configured to control / regulate a water treatment process as a function of measurement data or process parameters provided by means of the metrological device (10) preferably wirelessly via at least one communication module (102).Water treatment process, operated or at least optimized based on measurement data or process parameters provided by means of at least one metrological device (10) according to one of Claims 1 to 26.Metrology system (20) comprising at least one metrology device (10) according to one of Claims 1 to 26, having at least one database (21) and at least one arithmetic unit (22) configured to evaluate measurement data based on machine learning, wherein cell parameters are evaluated for determining the chemical and / or biological oxygen requirement, which are / have been generated based on modulation, in particular pulse modulation, of the external electrical load resistance of measurement data relating to cell-internal resistance components and / or voltage, capacitance, current, power and / or electrical charge measurement data, which measurement data are / have been recorded over an evaluation period of at least 30 days.Metrology system (20) comprising at least one metrology device (10) according to one of Claims 1 to 26, in particular metrology system (20) according to the preceding claim, wherein the metrology system (20) provides the in each case at least one metrology device (10) at a multiplicity of different measurement points and provides a network or a swarm or a grid of measurement points which can be evaluated in combination with one another.The metrology system (20) according to any one of claims 29 to 30, wherein the metrology system (20) evaluates a plurality of different measurement points at each of which a plurality of metrology microbial electrochemical technology units (11) are provided.Computer program product comprising instructions which, when the computer program product is executed on a computer or a metrology device or a metrology system, cause said / s to execute a method according to the following steps, namely a method for generating at least one energetic / electrochemical parameter from measurement data acquired by means of at least one metrology microbial electrochemical technology unit (11) based on bioelectrochemical processes, wherein at least one measurement value is correlated with at least one process parameter (P SB) in particular with a process parameter (P SB) for the chemical / biological oxygen requirement (CSB / BOD) and / or for a carbon consumption rate and / or for substance fractions of volatile fatty acids, in particular acetates; wherein the measurement data are recorded by means of the at least one metrological microbial electrochemical technology unit (11) having at least one active ceramic (12.2) arranged and arranged between the cathodic region (11.1) and the fluid to be examined, wherein the generation of the at least one energetic / electrochemical parameter takes place recorded from measurement data over an evaluation period of at least 30 days, in particular measurement data from cell-internal resistance components and / or voltage, capacitance, current, power and / or electrical charge measurement data.Computer program product according to the preceding claim, wherein a separator of the metrological microbial electrochemical technology unit (11) is defined by means of the at least one ceramic (12.2), which separator separates an anodic region (12a) and a / the cathodic compartment (12b) of a / the membrane electrode assembly (12) of the metrological microbial electrochemical technology unit (11) in the manner of a full-area intermediate layer in such a way that a long-term stability of at least two months using metrology is ensured and the measurement data are provided as a data basis for an AI training without perceptible drift and evaluated on the basis of at least one self-learning algorithm.Computer program product according to one of claims 32 to 33, wherein the generation of the at least one energetic / electrochemical parameter comprises a modulation, in particular a pulse modulation of the external electrical load resistance; and / or wherein a / the modulation, in particular pulse modulation without a PC connection, namely locally at a / the corresponding measurement point; and / or wherein the collected measurement data, in particular measurement data from cell-internal resistance components and / or voltage, capacitance, current, power and / or electrical charge measurement data, are evaluated based on at least one AI model.Computer program product according to one of claims 32 to 34, wherein at least one boundary condition from the following group is taken into account for correlating the generated cell parameters with the at least one process parameter (P SB) in particular provided by a corresponding sensor for acquiring measurement data relating to at least one fluid characteristic from the following group: conductivity, temperature, pH value.Computer program product according to one of claims 32 to 35, wherein the correlation of the generated cell parameters with the at least one process parameter is carried out for at least one process-related activation stage of a water treatment process, in particular in combination with a control / regulation of the water treatment process on the basis of the determined measurement data.Computer program product according to one of claims 32 to 36, wherein at least one measurement value is correlated with a process parameter (P SB) for a / the chemical oxygen demand (COD); and / or wherein at least one measurement value is correlated with a process parameter (P SB), in particular COD, based on the biological oxygen demand (BOD); and / or at least one measurement value is correlated with a process parameter (P SB), in particular COD, based on substance fractions of volatile fatty acids, VFA.Computer program product according to one of Claims 32 to 37, wherein the carbon consumption rate (CCR) is determined, wherein the carbon consumption rate is output as a process parameter which can be used in particular within the scope of open-loop / closed-loop control and / or is further evaluated for determining a process parameter (P SB) for the chemical oxygen demand (COD) or the COD itself; and / or wherein the carbon consumption rate is determined on the basis of biocurrent generated by means of the metrological microbial electrochemical technology unit (11) of the metrological device (10), in particular with reference to an electron / current equivalent of the COD and the yield rate 0.243.Computer program product according to one of claims 32 to 38, wherein the evaluation of measurement data is carried out on the basis of machine learning, wherein cell parameters are evaluated for determining the chemical and / or biological oxygen demand and / or the carbon consumption rate and / or substance fractions of volatile fatty acids, which are / have preferably been generated on the basis of modulation, in particular pulse modulation, of the external electrical load resistance of measurement data relating to cell-internal resistance components and / or voltage, capacitance, current, power and / or electrical charge measurement data, which measurement data are recorded over an evaluation period of at least 30 days.Computer program product according to one of claims 32 to 39, wherein the metrological microbial electrochemical technology unit is designed as a three-electrode system with a / the third electrode in the embodiment as a reference electrode, wherein the potential is measured by means of the reference electrode, in particular in the immediate vicinity of the anode, in particular simultaneously to the measurement carried out by means of the membrane-electrode assembly of the MET.Computer program product according to one of claims 32 to 40, wherein the measurement device, in particular the measurement microbial electrochemical technology unit, has a basic calibration, in particular a basic calibration set by means of at least one ML algorithm, wherein the generation of the at least one energetic / electrochemical parameter from the collected measurement data takes place based on the basic calibration.Computer program product for controlling / regulating at least one manipulated variable of a water treatment process based on measurement data or process parameters provided by means of a metrological device according to one of Claims 1 to 26.Computer program product comprising instructions which, when the computer program product is executed on a computer or a metrology device or a metrology system, cause said / s to execute steps for controlling / regulating a method having the following steps on the computer, namely a method for generating at least one energetic / electrochemical parameter from measurement data acquired over an evaluation period of at least 30 days by means of at least one metrological microbial electrochemical technology unit (11) comprising at least one ceramic (12.2) arranged between the cathodic region (11.1) and the fluid to be examined, wherein at least one measurement value is correlated with at least one process parameter (P SB) in particular measurement data from cell-internal resistance components and / or voltage, capacitance, current, power and / or electrical charge measurement data; In particular, on the basis of measurement data, it is detected / determined by means of a metrological apparatus (10) according to one of Claims 1 to 26.Use of a membrane electrode assembly (12) in a metrological microbial electrochemical technology unit (11) of a metrology device (10) for generating at least one energetic / electrochemical parameter when acquiring measurement data over an evaluation period of at least 30 days, wherein a / the at least one membrane component of the membrane electrode assembly (12) is formed by a ceramic (12.2), wherein a / the cathode (12.3) of the membrane electrode assembly (12) is formed by an activated carbon-graphite conductive carbon mixture or activated carbon fiber felt or granulated activated carbon or graphite felt, wherein a / the anode (12.1) of the membrane electrode assembly (12) is formed at least partially by a carbon-based activated carbon fiber felt or carbon fiber fleece or graphite felt, wherein at least one measured value is correlated with at least one process parameter (P SB) based on the measured data, wherein the at least one energetic / electrochemical parameter is generated from the measured data recorded over an evaluation period of at least 30 days, in particular from measured data relating to cell-internal resistance components and / or from voltage, capacitance, current, power and / or electrical charge measured data.Use of a metrological microbial electrochemical technology unit (11) of a metrological device (10) for generating at least one energetic / electrochemical parameter when collecting measurement data over an evaluation period of at least 30 days, wherein the metrological microbial electrochemical technology unit (11) has at least one active ceramic (12.2) arranged between the cathodic region (12b) and the fluid to be examined, wherein at least one measurement value is correlated with at least one process parameter (P SB) based on the collected measurement data, in particular with respect to the chemical / biological oxygen requirement (COD / BOD) and / or a carbon consumption rate and / or substance fractions of volatile fatty acids, wherein the generation of the at least one energetic / electrochemical parameter from measurement data with respect to cell-internal resistance components and / or voltage, capacity, current, Power and / or electrical charge measurement data is carried out, wherein the generation of the at least one energetic / electrochemical parameter is carried out on the basis of modulation, in particular pulse modulation of the external electrical load resistance; wherein the metrological microbial electrochemical technology unit (11) is used in the implementation of at least one sensor system from the following group: floor sensor system, water sensor system, waste water sensor system in general, aquaristics sensor system, channel sensor system, sensor system in the inflow upstream of sewage treatment plants or individual process stages, sensor system in the outflow downstream of sewage treatment plants, in particular in the region of so-called prefluxers or downstream of individual process stages, sensor system in at least one process activation stage of a water treatment process, sensor system for detecting photosynthetic processes, sensor system for industrial and plant sewage treatment plants, groundwater sensor system.A system with platform functionality, configured for data correlation and evaluation and reproduction, in particular via a graphical user interface, for providing at least one mobile usable monitoring function for at least one user, in particular with respect to approximation / position in each case relating to a single one of a plurality of measurement points, at which measurement points in each case at least one metrological device according to one of claims 1 to 26 is implemented for generating at least one energetic / electrochemical parameter from measurement data based on bioelectrochemical processes.

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