194 results about "Bioelectrochemistry" patented technology

The invention relates to a bioelectrochemical sensor used for detecting hydrogen peroxide and a manufacturing method of the bioelectrochemical sensor. The novel bioelectrochemical sensor is a sensor with a three-electrode system, wherein the counter electrode is a platinum electrode, the reference electrode is saturated calomel electrode and the working electrode is gold electrode. The sensor is based on orientation combination of a polypeptide horse radish peroxidase with characteristic sequence, the promotion effect of the polypeptide horse radish peroxidase on the activity of the enzyme and the characteristic of high sensitivity of electrochemical detection methods. The sensitivity of hydrogen peroxide sensors is effectively improved and satisfactory results are obtained.

A microbial electrochemical filter and a method for using same to remove iron, manganese and ammonia nitrogen from underground water, which belong to the technical field of wastewater treatment. The filter and the method solve the problem of existing biological filters having poorer operation performance and stability under oligotrophic conditions. The microbial electrochemical filter comprises a cylinder (1), an electrochemical system, and a filter column (4), wherein the electrochemical system and the filter column (4) are arranged in the cylinder (1); the electrochemical system is arranged above the filter column (4); the filter column (4) consists of a carrier, a surface of which is covered with a biological film; and a water outlet (8) is provided in a lower portion of a side wall of the cylinder (1), and an overflow port is provided in an upper portion of the side wall of the cylinder (1). In the method, by means of an electro-oxidation process, some pollutants are removed before entering a filter column (4), thus reducing the bioremoval pressure in the filter column (4); the abundance and carbon sequestration capability of autotrophic microbes in a biological filter are enhanced by means of an electrochemical system, thereby providing an additional carbon source and an additional electron acceptor for the autotrophic biological filter, and prompting the growth and metabolism of biological communities; and the microbial electrochemical filter provides conditions for the growth of heterotrophic iron-manganese oxidizing flora, and achieves the generation and coverage of more iron-manganese active oxide films on the surfaces of filter materials.

The invention relates to a coal chemical wastewater treatment device with nano-catalysis coupled with bioelectrochemistry. The invention belongs to the technical field of coal chemical wastewater treatment. The device comprises a pretreatment area, a bioelectrochemical treatment area, a catalyst recovery area and a clear water area which are connected in sequence, a nano Fe3O4 / TiO2 composite catalyst filling layer and a microporous aeration device are arranged in the pretreatment area; a biological anode region of the biological electrochemical treatment region adopts a graphene modified carbon brush, and a biological cathode region of the biological electrochemical treatment region adopts a sulfur-doped carbon felt; and the catalyst recovery area adopts a high-gradient permanent magnetic roller and is matched with a pulse backwashing system. The treatment cost of each ton of water is reduced to 25-35 yuan, and the cycle life of the catalyst is gt; the time is 200 times; the sulfur can be reused in a desulfurization process of a sewage treatment plant, so that the medicament cost is reduced; the carbon emission is reduced by 60%; the COD removal rate is not less than 95%, the total phenol removal rate is not less than 98%, and the total nitrogen removal rate is not less than 90%; energy consumption is reduced by 40% compared with a traditional electrochemical method, and the catalyst recovery rate is gt; 95%.

The invention relates to the technical field of sewage treatment equipment, in particular to an electrolytic biological filter system for rapid treatment of overflow pollution and an operation method, a bioelectrochemical system is coupled with a biological aerated filter to form the electrolytic biological filter system for rapid treatment of overflow pollution; the rapid electron transfer characteristic of a bioelectrochemical system is fully utilized, the denitrification rate of the biological aerated filter is improved, the treatment time can be greatly shortened under the same denitrification requirement, and the effect of rapidly treating overflow pollution in emergency is achieved.

The invention belongs to the technical field of wastewater treatment and recycling, and relates to a low-pressure ultrafiltration sewage treatment method and device based on bioelectrochemical enhancement and application. The treatment device consists of a water inlet tank, a constant water level water tank, a cathode, a resistor, a membrane assembly, a biological filter cake layer, a pre-filtering layer-anode, an ultrafiltration membrane, a water collecting device, a data acquisition module and a computer. The treatment device is used for treating effluent of a secondary sedimentation tank of a sewage plant and tail water of livestock and poultry breeding wastewater; on the basis of retaining nitrogen and phosphorus resources, deep removal of heavy metals and antibiotics is realized, propagation of resistance genes is inhibited, and safe reuse of nitrogen and phosphorus resources in effluent of sewage plants and tail water of livestock and poultry breeding wastewater can be realized. In the invention, low-pressure ultrafiltration adopts transmembrane pressure difference generated by gravitational potential energy to realize continuous flow filtration, coupled bioelectrochemistry utilizes electric energy generated by biodegradation of organic matters to realize reduction of heavy metals and deep removal of reinforced antibiotics, and the method has the advantages of greenness, low carbon and sustainability.

The invention relates to the technical field of semiconductors, in particular to a graphene electrode-based monomolecular chain pH sensor and a preparation method thereof, the pH sensor comprises a graphene source terminal electrode, a monomolecular chain and a graphene drain terminal electrode which are sequentially connected through amido bonds; the monomolecular chain comprises a starting unit, a monomolecular polymer and a terminating unit which are connected in sequence, the starting unit and the terminating unit are selected from aniline or phenylenediamine, the monomolecular polymer is formed by electrochemical polymerization of monomer molecules, the monomer molecules are selected from aniline or aniline derivatives, and the polymerization process of the monomer molecules is controllable through an electrochemical polymerization method; the static electrode is combined with the dynamic assembly, so that the performance optimization of the pH sensor can be realized; meanwhile, according to the electrochemical polymerization method, the number of monomer molecules can be flexibly adjusted in the dynamic assembly process, the size adaptability of a single molecular chain and the static graphene electrode is remarkably improved, and therefore the connection success rate is increased.

The invention belongs to the technical field of new energy materials and bioelectrochemistry, and particularly relates to an iron-based multi-metal sulfide composite carbon anode material and a preparation method of the iron-based multi-metal sulfide composite carbon anode material. The preparation method is simple in process flow, convenient to operate, easy for large-scale production, wide in raw material source, low in cost and environment-friendly, and can be used for preparing the three-dimensional porous carbon matrix which is formed by foaming and carbonizing polyvinylpyrrolidone and is provided with interconnected carbon nanosheets. Through reasonable composition design and structural regulation, and optimization of metal ratio and vulcanization conditions, accurate regulation of material performance can be realized, electrochemical performance and biocompatibility are significantly improved, electricity generation performance and operation stability of a microbial fuel cell are improved, and good industrial application prospects are achieved.

The invention describes the coupling of an anaerobic biological system (110) with a bioelectrochemical system (120) in order to intensify the operation of the anaerobic system and recover the ammoniacal nitrogen contained in a digestate (3). The invention determines at least one operating parameter of an evaporation extraction system drawing off volatile organic matter from a liquid medium as a function of a value of a characteristic ratio of the mixture of this volatile organic matter with the digestate (3), this ratio being representative of an amount of biodegradable organic matter relative to an amount of ammonium ions. The value of this ratio is determined as a function (bi) of a target yield of ammonium ions extracted from the bioelectrochemical treatment system or of a target concentration of ammonium ions separated by this system, and (bii) of the value of at least one parameter representative of the capacity of the electrochemical treatment system to separate the ammonium ions and of at least one quality parameter of the digestate.

The invention relates to a microbial electrode online monitoring system and method based on multi-modal fusion and a self-repairing mechanism, and belongs to the technical field of environmental monitoring and bioelectrochemistry. Aiming at the problems of high cost, weak anti-interference capability, poor long-term stability, difficulty in precise decoupling of multi-parameter coupling and the like in the existing microbial electrode monitoring technology, the method comprises the following steps: synchronously acquiring multi-modal signals of a dual-wavelength differential near infrared spectrum and an electrochemical impedance spectrum; a front decoupling mechanism based on equivalent circuit fitting and reinforcement learning is combined to clearly distinguish change sources of charge transfer resistance and diffusion resistance; performing deep fusion on the decoupled features by using a convolutional neural network, and outputting a microbial activity score and a metabolite concentration; and a self-repairing electrode material and a closed-loop feedback control mechanism are introduced, and repairing is automatically triggered when electrode performance degradation is monitored. According to the invention, low-cost, high-precision and strong-anti-interference long-term stable in-situ monitoring of the microbial electrode is realized.

The utility model relates to the technical field of sewage treatment equipment, in particular to an electrolytic biological filter system for rapid treatment of overflow pollution, which comprises a bioelectrochemical system and a biological aerated filter system, the bioelectrochemical system comprises a tank body I, a biological anode and a biological cathode are arranged in the tank body I, and the biological anode and the biological cathode are arranged in the tank body II. The biological anode and the biological cathode are connected to a power supply, the biological aerated filter system comprises a tank body II, sewage treated by the tank body I enters the tank body II, an aeration device, a filtering device and a clear water outlet device are arranged in the tank body II, and the biological electrochemical system is coupled with the biological aerated filter through the aeration device, the filtering device and the clear water outlet device. The electrolytic biological filter system for rapidly treating overflow pollution is formed, the rapid electron transfer characteristic of a bioelectrochemical system is fully utilized, the denitrification rate of the biological aerated filter is increased, the treatment time can be greatly shortened under the same denitrification requirement, and the effect of rapidly treating overflow pollution in emergency is achieved.

The present invention relates to a bioelectrochemical device for treating soy sauce wastewater and a preparation method thereof. The bioelectrochemical device comprises an anode chamber and a cathode chamber, wherein a columnar anode is disposed at the center of the anode chamber; a columnar cathode is disposed at the center of the cathode chamber; the space between the columnar anode and the anode chamber is filled with a modified conductive oxidizing filler; electroactive bacteria grow on the columnar anode and the modified conductive oxidizing filler, and the modified conductive oxidizing filler is metal-doped activated carbon. The metal-doped activated carbon is formed by mixing the activated carbon with a mixed solution of zinc sulfate and potassium sulfate, adsorbing the zinc sulfate and potassium sulfate onto the activated carbon, and then calcining the activated carbon to form corresponding metal oxides on the surface of the activated carbon. Due to the introduction of metallic potassium and metallic zinc, the metallic potassium and metallic zinc have electronic interaction and synergistic effects, thereby improving electronic conductivity and promoting degradation treatment of the soy sauce wastewater.

The invention relates to a process for degrading one or more hydrocarbon compounds in an aqueous solution. The one or more hydrocarbons comprise at least one of phenol, methyl phenyl ketone and methyl phenyl methanol. The degradation process is carried out in two or more continuously operating bioelectrochemical cells, thereby defining at least one upstream bioelectrochemical cell and one downstream bioelectrochemical cell, and the applied voltage of each bioelectrochemical cell is different. The bioelectrochemical cell includes a microbial culture. The one or more hydrocarbon compounds are converted at the anode to produce carbon dioxide, protons, and optional degradation products. At the cathode, the carbon dioxide and / or optional degradation products react with the protons to produce methane. A treated aqueous solution having a reduced content of the one or more hydrocarbon compounds is thus obtained.

The invention discloses a method for removing heavy metals in sludge, and belongs to the field of environmental protection technology and solid waste recycling. The method comprises the following steps: adding a bioleaching bacteria solution and a nutritive salt solution into dewatered sludge, and adjusting the pH value to form mixed slurry; applying an asymmetric alternating-current electric field to the mixed slurry to perform biological-electrochemical coupling treatment, and performing solid-liquid separation on the treated slurry to respectively obtain purified sludge and leachate containing heavy metals. By utilizing polarization inhibition and oscillation mass transfer effects of the asymmetric alternating-current electric field, the removal efficiency of the bioleaching on the heavy metals in the sludge, especially the organic combined state and residual state heavy metals, is remarkably enhanced, and the method has the outstanding advantages of short treatment period, low energy consumption, no electrode polarization and high heavy metal removal rate.

The application discloses a biological electrochemical auxiliary sulfur conversion promoting sulfur-based denitrification and sulfate emission reduction method and belongs to the field of water treatment. ‑ Nitrogen-containing wastewater enters an elemental sulfur denitrification system, and NO3 0 is reduced to N2 by sulfur autotrophic denitrifying bacteria, and elemental sulfur (S 2‑ ) is converted into SO4 2‑ . Effluent enters a cathode chamber of an electrochemical auxiliary sulfate reduction system, and hydrogen autotrophic sulfate reducing bacteria utilize cathode hydrogen production to reduce SO4 ‑ to HS 2‑ , and meanwhile, alkalinity produced by cathode hydrogen production neutralizes acidity produced in the denitrification process in the elemental sulfur denitrification system. ‑ HS 2‑ / supernatant is returned to the elemental sulfur denitrification system to react with S 0 to generate polysulfide (S n 2‑ ), S n 2‑ , which is used as an efficient electron donor to participate in denitrification, thereby significantly improving denitrification efficiency. The application does not need to add an organic carbon source, sludge production is small, high-concentration nitrogen-containing wastewater is efficiently treated, and the content of sulfate in effluent is simultaneously reduced, thereby realizing sulfur resource recycling, and the application is an economic and environment-friendly autotrophic denitrification method.

The invention relates to a device for extracting ammonium ions (8) from a digestate resulting from a treatment of an enrichment liquid made of biodegradable material and comprising: - a bio-electrochemical treatment unit (12) receiving a first volume of digestate and a second volume of enrichment liquid, - a unit (40) for acquiring a value of at least one parameter representative of a value of at least one quality parameter of the digestate, and of a value of at least one quality parameter of the enrichment liquid, - a unit (44) for determining a value of a ratio of a mixture representative of an amount of biodegradable organic material relative to an amount of ammonium ions, - a unit (48) for determining a mixing ratio of the digestate and of the enrichment liquid depending on the value of the ratio characteristic of a mixture, - a control unit (52) configured to obtain it.

The invention describes the coupling of a digester (110) with a bioelectrochemical system (120) in order to intensify the operation of the digester and recover the ammoniacal nitrogen contained in the digestate (3). The invention determines at least one operating parameter of the digester as a function of a value of a characteristic ratio of the digestate (3) or of the liquid fraction (3a) thereof, representative of an amount of biodegradable organic matter relative to an amount of ammonium ions. The value of this ratio is determined as a function (bi) of a target yield of ammonium ions extracted from the bioelectrochemical treatment system or of a target concentration of separated ammonium ions present in the bioelectrochemical treatment system, and (bii) of the value of at least one operating parameter of the bioelectrochemical treatment system representative of the capacity of the electrochemical treatment system to separate the ammonium ions and of the value of at least one quality parameter of the digestate or of the liquid fraction thereof.

The invention belongs to the technical field of heavy metal contaminated soil bioremediation, and particularly relates to a method for remediating heavy metal contaminated soil through a Fe3C-N-S composite modified electrode enhanced bioelectrochemical system. Graphene oxide, an iron source, a nitrogen source and a sulfur source serve as raw materials, a Fe3C-N-S composite material is prepared through high-temperature calcination, then the Fe3C-N-S composite material is compounded with sodium alginate (SA) hydrogel, the surface of a graphite rod is coated with the composite material, a Fe3C-N-S composite modified electrode is constructed through a CaCl2 cross-linking and freeze-drying technology, then the modified electrode is coupled with a graphite cathode, and the composite material is obtained. And the acidophilic thiobacillus ferrooxidans is combined to construct a bioelectrochemical system, so that the synergistic and efficient leaching of the heavy metals in the soil is realized. The conductivity, biocompatibility and corrosion resistance of the electrode can be remarkably improved, the problems that mass transfer is difficult and microorganism loading is unstable in BES remediation are solved, and a breakthrough technical scheme is provided for green and efficient remediation of heavy metal contaminated soil.

The invention relates to a bioelectrochemical method for efficiently removing fluorine and degrading perfluorinated compounds and application of the bioelectrochemical method, and belongs to the technical field of pollutant treatment. According to the method disclosed by the invention, the sulfate reducing flora (SRB) which takes Clostridiumsensuricto as a main dominant bacterium (the relative abundance is 46.06%) is enriched. The SRB rapidly grows on the surface of the cathode by using electrons provided by the cathode, and ferrous sulfide with conductivity is synthesized on the surface of the cathode, so that the resistance is further reduced, and electron transfer between the SRB and the cathode is promoted. The reacted cathode forms a biological membrane with Tissierella (the relative abundance is 41.32%) as a main dominant bacterium, and compared with an electrochemical method without a biological membrane, the bioelectrochemical method has the advantage that the degradation rate and the defluorination rate of perfluorinated compounds are remarkably improved. In addition, by optimizing the composition of the electrolyte, the degradation rate and the defluorination rate can be further improved, and the defluorination rate can reach 90% or above.

In some embodiments of the present disclosure, there is provided a bioelectrochemical sensor for measuring analyte or substrate molecule (signal) concentration in which the current (response) is insensitive to oxygen, does not require media or sensing product molecule species, including low sensitivity to interferents, and can be used to measure the concentration of an analyte or substrate molecule (signal). And includes high operational stability in both steady state response amplitude and response time.

The invention discloses a device for noninvasive regulation and control of a blood brain barrier in a non-invasive pulsed electric field. The device comprises a high-voltage pulse generator, a plurality of treatment electrodes and a fixing device. The connection tightness of endothelial cells is adjusted through a high-voltage short-pulse electric field, local regulation and control of the brain area are achieved in combination with electrode design, pulse parameters are flexibly adjusted to balance the effect and damage, and a new non-invasive physical treatment means is provided for assisting drug cross-blood-brain-barrier delivery. Compared with focused ultrasound, the multi-mechanism synergistic effect (electroporation effect and bioelectrochemical effect) is utilized instead of depending on the mechanical effect of exogenous microbubbles, so that the safety risk is remarkably reduced. The system has the advantages of noninvasiveness, safety and space flexibility, and can be opened for a long time. The non-invasive electrode is used for delivering instantaneous high-voltage electric pulses, which is different from conventional low-voltage long-time electric stimulation.

This invention discloses a bioelectrochemical denitrification system using a slow-release carbon source as the anode fuel, belonging to the field of microbial fuel cell technology. It comprises an anode chamber, a cathode chamber, an anode, a cathode, wires, and a separating membrane between the anode and cathode chambers. Electrochemically active microorganisms grow on the anode in the anode chamber, and anaerobic fermentation bacteria are present in the solution. An electrolyte and hydrogel particles with slow-release carbon function are added to the anode chamber. Electrochemically active denitrifying bacteria grow on the cathode in the cathode chamber. The hydrogel-released carbon serves as the solid fuel at the anode, providing a continuous electron donor to the cathode. Simultaneously, the selective permeation membrane controls the transmembrane transport of small organic molecules to the cathode, providing a carbon source for the denitrifying bacteria. The combined supply of electrons and carbon enhances denitrification by the denitrifying microorganisms at the cathode. This system is suitable for enhanced denitrification of polluted water bodies with low C / N ratios.

An electroactive bio-carrier module and a sewage treatment device using same are provided, which relate to the field of bioelectrochemistry and sewage treatment. The electroactive bio-carrier module is composed of an anode module and a cathode module made of a conductive material. The anode module is formed by connecting carbon fiber brushes in series and is of a vertically ring type structure; the cathode module is formed by connecting stainless steel meshes in series; the stainless steel meshes are in a folded horizontal stacked design; the anode and cathode modules are connected through an external lead wire to form a circuit. Surfaces of the anode and cathode modules can both enrich microorganisms, biofilms are formed on the surfaces. The electrode module is arranged in an up-flow type sewage treatment device and is used as an electroactive bio-carrier, to form a hybrid sewage treatment device with a built-in electroactive bio-carrier.

Provided is a bioelectrochemical sensor for measuring a target substance which at least comprises: a working electrode which comprises a biosensing molecule, which can catalyze or bind to the target substance, and a reference electrode which comprises a bioreference molecule which harbors a redox species which can be electrochemically accessible to the reference electrode, thereby giving a specific redox potential but lacks a catalytic activity or binding ability to the target substance.

The invention describes the coupling of a digester (110) with a bioelectrochemical system (120) to intensify the operation of the digester and recover the ammoniacal nitrogen contained in the digestate (3). The invention determines at least one operating parameter of the digester as a function of a value of a ratio characteristic of the digestate (3) or its liquid fraction (3a), representative of a quantity of biodegradable organic matter relative to a quantity of ammonium ions.The value of this ratio is determined based on (bi) a target yield of ammonium ions extracted from the bioelectrochemical treatment system or a target concentration of separated ammonium ions present in the bioelectrochemical treatment system, and (bii) the value of at least one operating parameter of the bioelectrochemical treatment system representative of the electrochemical treatment system's capacity to separate ammonium ions, and the value of at least one quality parameter of the digestate or its liquid fraction. (Shorthand figure: Figure 1.)

A system for noninvasive regulation and control of blood brain barrier permeability through a transcranial pulsed electric field comprises a high-voltage pulse generator and a plurality of treatment electrodes. The connection tightness of endothelial cells is adjusted through a high-voltage short-pulse electric field, local regulation and control of the brain area are achieved in combination with electrode design, pulse parameters are flexibly adjusted to balance the effect and damage, and a new non-invasive physical treatment means is provided for assisting drug cross-blood-brain-barrier delivery. Compared with focused ultrasound, the multi-mechanism synergistic effect (electroporation effect and bioelectrochemical effect) is utilized instead of depending on the mechanical effect of exogenous microbubbles, so that the safety risk is remarkably reduced. The method has the advantages of noninvasiveness, high efficiency and safety, and can achieve a multi-mechanism synergistic effect. The non-invasive electrode is used for delivering instantaneous high-voltage electric pulses, which is different from conventional low-voltage long-time electric stimulation.

The invention discloses a carbon-felt-based Ni-coated UiO-66 / GO catalytic electrode, a preparation method and application of the carbon-felt-based Ni-coated UiO-66 / GO catalytic electrode, and a product containing the carbon-felt-based Ni-coated UiO-66 / GO catalytic electrode, and belongs to the technical field of sewage purification and wastewater resource utilization. Comprising the following steps: jointly loading Ni-coated UiO-66 and graphene oxide on a carbon felt by utilizing hydrothermal synthesis to prepare the carbon felt-based Ni-coated UiO-66 / GO catalytic electrode, wherein the molar ratio of a nickel source to a zirconium source in the Ni-coated UiO-66 is 1: 3. The carbon felt-based Ni-coated UiO-66 / GO catalytic electrode (Ni-coated UiO-66 / GO-CF) prepared by the preparation method disclosed by the invention is applied to a stacked bioelectrochemical system as a cathode material, and has an obvious promotion effect on an oxidation-reduction reaction of the electrode; the method is used for treating heavy metal wastewater discharged in a printed circuit board electroplating process, and typical heavy metal elements can be completely removed basically.

The present application relates to the organic wastewater and greenhouse gas carbon dioxide resource utilization, biological energy and biological electrochemical engineering cross technical field, disclose a kind of system and method for preparing middle chain fatty acid and sustainable aviation fuel in cooperation, system with organic wastewater as carbon source and electron donor, short-chain organic acid is converted into middle chain fatty acid by anaerobic microorganism carbon chain extension reaction, and is separated in situ by liquid membrane extraction and enriched;Enriched product is introduced into microbial electrosynthesis reactor, and further carbon chain extension is carried out by anode Kolbe electrolysis catalysis, and C10-C14 sustainable aviation fuel is prepared;Carbon dioxide is used as carbon source in cathode, and is converted into acetic acid by microbial catalysis, and carbon chain extension is carried out again by co-fermentation with organic wastewater.The present application realizes the synergic integration of organic wastewater treatment, carbon dioxide resource utilization and high value-added fuel preparation, and has high resource utilization degree, high carbon utilization efficiency and significant environmental benefits.

A bio-electrochemical electrode current control system for improving the performance of bio-electrochemical systems is provided. The system comprises at least a pair of bio- electrochemical electrodes disposed inside a vessel of a bio-electrochemical system. The bio- electrochemical electrodes have a large surface area in contact with an operating fluid disposed in the vessel. An electric power source is operatively connected to each pair of the at least a pair of bio-electrochemical electrodes such that in operation the bio- electrochemical electrodes of each pair of the at least a pair of bio-electrochemical electrodes have a polarity corresponding to one anode and one cathode. A polarity switching circuitry is interposed between the electric power source and each pair of the at least a pair of bio- electrochemical electrodes for simultaneously switching the polarity of the bio- electrochemical electrodes of each pair of the at least a pair of bio-electrochemical electrodes. A processor is operatively connected to the polarity switching circuitry. The processor is adapted for controlling the polarity switch such that the polarity is repeatedly switched after elapse of a preset switching time interval greater than about one second. In operation, the operating fluid is bio-electrochemically processed while the electric current is provided to each pair of the at least a pair of bio-electrochemical electrodes such that the polarity of the bio-electrochemical electrodes of each pair of the at least a pair of bio- electrochemical electrodes is repeatedly switched.

The invention relates to a microbial community optimization method for carbon dioxide reduction of a microbial electrochemical system, which is used for modifying a microbial community through a synthetic biological technology to improve the reduction capacity of the microbial community to carbon dioxide and optimizing the operation parameters of the microbial electrochemical system to improve the electron transfer efficiency. The invention also provides a microbial electrochemical system using the method, which can efficiently convert carbon dioxide into useful chemicals.

The invention discloses a semi-closed-loop microbial electrochemical device and method for purifying water and sediment, the semi-closed-loop microbial electrochemical device comprises a bacteria-algae coexistence SBR reactor, a direct current power supply, an anode and a cathode, the anode is arranged on the surface layer of the sediment and is connected with the anode of the direct current power supply through a wire, the cathode is placed in the bacteria-algae coexistence SBR reactor, and the direct current power supply is connected with the anode of the direct current power supply through a wire. A water inlet of the bacteria-algae coexistence SBR reactor is communicated with river leakage sewage through a pipeline, so that the sewage can enter the bacteria-algae coexistence SBR reactor, and a water outlet of the bacteria-algae coexistence SBR reactor extends to the vicinity of the anode through a pipeline, so that water treated by the bacteria-algae coexistence SBR reactor is discharged to the vicinity of the anode. According to the semi-closed-loop microbial electrochemical device and method, pollutants in low-concentration sewage can be effectively degraded, in-situ treatment can be synchronously carried out on bottom mud, and an effective solution is provided for river sewage leakage.