Water quality evaluation equipment, water quality evaluation methods, water treatment systems, operation control devices.

Abstract

One of the objectives of the present invention is to provide a water quality evaluation device and a water quality evaluation method that can appropriately grasp fluctuations in the water quality of treated water without any time delay in understanding the water quality of the treated water, and regardless of the skill level of the workers. [Solution] To solve the above problems, we provide a water quality evaluation device and a water quality evaluation method using this device, comprising an imaging unit that images the water to be treated, and a determination unit that determines the water quality of the water to be treated based on the information acquired by the imaging unit, wherein the imaging unit is capable of acquiring information on optical characteristics related to a preset specific wavelength band. [Effects] This invention allows for the rapid and appropriate assessment of the water quality of treated water without relying on conventional methods such as water sampling or subjective judgment by workers. Furthermore, it reduces the frequency of maintenance required for the equipment used for monitoring the water quality of treated water, enabling low-cost and stable operation.

Description

Technical Field

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[0001] The present invention relates to a water quality evaluation apparatus and a water quality evaluation method. Further, the present invention relates to a water treatment system including the water quality evaluation apparatus and an operation control apparatus for the water treatment system.

Background Art

[0002] In the operation of facilities related to water treatment such as sewage treatment plants, wastewater treatment plants, and water purification plants (hereinafter also referred to as "water treatment systems"), a water quality monitoring system for monitoring the water quality of the water to be treated introduced into the water treatment system is used.

[0003] For example, in Patent Document 1, as a technique related to water quality monitoring of a water treatment system, a water sampling device for collecting a sample water to be monitored, a pretreatment device for continuously removing turbidity in the sample water collected by this water sampling device, a water quality measuring instrument (biosensor) for continuously detecting harmful substances in the sample water pretreated by this pretreatment device, and during periodic calibration of this water quality measuring instrument, an operation control device for stopping the operation of the water sampling device, stopping the flow of the sample water to the water quality measuring instrument, and controlling to wash the pretreatment device or the water quality measuring instrument are provided. A water quality monitoring system and a water quality monitoring method using this water quality monitoring system are described. Also, Patent Document 1 describes that a water quality monitoring system is installed in a grit chamber of a sewage treatment plant and continuous operation is performed while automatically maintaining and automatically cleaning.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] As shown in Patent Document 1, automation has been implemented for monitoring the water quality of water to be treated in a water treatment system. However, water quality monitoring that involves sampling (collecting) the water to be treated requires a considerable amount of time to determine the water quality, making it difficult to quickly and appropriately grasp fluctuations in the water quality of the water to be treated introduced into the water treatment system. Furthermore, as shown in Patent Document 1, methods of directly contacting the water to be treated with a water quality measuring instrument (such as a biosensor) in water quality monitoring require maintenance such as periodic cleaning of the water quality measuring instrument. As a result, even if water quality monitoring is performed, there is a problem in that it does not sufficiently contribute to maintaining the stable operation of the water treatment system (maintaining treatment performance, saving energy). Furthermore, one common maintenance method for the stable operation of water treatment systems is to rely on visual inspections by workers and judgments based on their experience. However, since maintenance based on worker judgment requires the accumulation of experience by the workers themselves, there are challenges in terms of training and securing skilled workers.

[0006] The object of the present invention is to provide a water quality evaluation device and a water quality evaluation method that can appropriately grasp fluctuations in the water quality of treated water without any time delay in grasping the water quality of the treated water, regardless of the skill level of the workers, and to provide a water treatment system equipped with this water quality evaluation device that can smoothly perform maintenance and management related to its operation, as well as an operation control device for the water treatment system. [Means for solving the problem]

[0007] As a result of diligent study on the above-mentioned problems, the inventors of the present invention have found that by using information obtained based on specific measurement techniques to understand the water quality of treated water, it is possible to make quick and appropriate judgments regardless of the skill level of the workers, and in particular, it is possible to appropriately understand rapid changes in water quality, thus completing the present invention. In other words, the present invention relates to the following water quality evaluation device, water quality evaluation method, water treatment system, and operation control device for the water treatment system (hereinafter also simply referred to as the "operation control device").

[0008] The water quality evaluation device of the present invention, which solves the above problems, is characterized by comprising a determination unit that determines the water quality of the water to be treated based on information relating to the optical characteristics of a predetermined specific wavelength band as information obtained from the water to be treated. As a result of diligent research, the inventors have found that by performing measurements based on a measurement technology that enables the acquisition of information on the optical properties of water to be treated in a specific wavelength band, it becomes possible to acquire information on the water quality of the water to be treated without contact with the water, and at the same time, it becomes easier to make quick and continuous judgments regarding the water quality of the water to be treated. The water quality evaluation device of the present invention is based on the above-mentioned findings and can quickly and appropriately grasp the water quality of treated water without relying on conventional water quality monitoring involving water sampling or subjective judgment by workers, and can particularly appropriately grasp rapid changes in water quality. Furthermore, the water quality evaluation device of the present invention enables non-contact measurement of the treated water, thereby reducing the frequency of maintenance in the maintenance and management of the device for monitoring the water quality of the treated water, and enabling low-cost and stable operation.

[0009] Furthermore, one embodiment of the water quality evaluation device of the present invention is characterized by further comprising an imaging unit for acquiring information. This feature makes it possible to easily perform non-contact measurements of the treated water when acquiring information about its water quality. Furthermore, it becomes easier to link the operation of acquiring information about the optical properties of the treated water in a specific wavelength range with the operation of determining the water quality based on this information. In other words, it becomes easier to acquire and update the information necessary to determine the water quality of the treated water.

[0010] Furthermore, one embodiment of the water quality evaluation device of the present invention is characterized in that the water quality of the treated water to be judged in the judgment unit is at least one selected from organic matter concentration, inorganic nitrogen compound concentration, and foreign matter contamination. This feature allows for the detection of changes in the water quality of treated water using criteria similar to, or even better than, those used in conventional water quality monitoring involving water sampling or subjective judgments by workers.

[0011] Furthermore, one embodiment of the water quality evaluation device of the present invention is characterized by having an output unit that outputs the judgment result from the judgment unit to an external source. This feature allows workers to quickly and accurately grasp information regarding the water quality of the treated water, making it easier to take appropriate action as needed. Furthermore, applying this water quality evaluation device to a water treatment system can significantly contribute to the stable operation and maintenance of the water treatment system.

[0012] The present invention, which solves the above problems, is characterized by comprising a determination step in which the water quality of the water to be treated is determined based on information regarding the optical properties related to a predetermined specific wavelength band, as information obtained from the water to be treated. The present invention provides a water quality evaluation method that enables the acquisition of information regarding the optical properties of treated water in a specific wavelength band by performing measurements based on measurement technology. This method allows for the acquisition of information regarding the water quality of treated water without contact with the treated water, and is based on the inventors' findings that it facilitates rapid and continuous judgment regarding the water quality of treated water. This method allows for rapid and appropriate assessment of the water quality of treated water without relying on conventional water quality monitoring involving water sampling or subjective judgment by workers, and is particularly effective in appropriately detecting rapid changes in water quality.

[0013] The water treatment system of the present invention, which solves the above problems, comprises the above-described water quality evaluation device and a processing unit for treating the water to be treated, wherein the water quality evaluation device uses information obtained from the water to be treated introduced to the upstream and / or downstream side of the processing unit. This feature allows for the accurate detection of water quality fluctuations regardless of the operator's skill level, and enables rapid detection of water quality fluctuations, particularly at specific points within the treatment area. This facilitates smoother maintenance and management of the water treatment system and optimizes its continuous operation.

[0014] Furthermore, one embodiment of the water treatment system of the present invention is characterized by comprising a control unit that controls the processing of the processing unit based on the evaluation results obtained by the water quality evaluation device described above. This feature allows for quick and efficient operation of the water treatment system, including maintenance and continued operation, by appropriately understanding fluctuations in the water quality of the treated water and performing operational control related to adjusting various parameters that affect the treatment efficiency in the processing unit.

[0015] Furthermore, in one embodiment of the water treatment system of the present invention, the water to be treated is sewage, the treatment area includes a grit tank and a disinfection tank, and the water quality evaluation device is characterized by using information obtained from the water to be treated introduced into the grit tank and / or disinfection tank. This feature allows for rapid monitoring of water quality fluctuations in the sedimentation tank (the upstreammost part of the wastewater treatment system) and the disinfection tank (the downstreammost part), thereby facilitating smoother maintenance and management of the water treatment system and optimizing its continued operation.

[0016] The operation control device of the present invention, which solves the above problems, is characterized by performing operation control of a water treatment system that includes the above-described water quality evaluation device and a processing unit that performs treatment of the water to be treated based on the evaluation results obtained by the water quality evaluation device. This feature eliminates the time delay in understanding the water quality of the treated water, and regardless of the skill level of the workers, it becomes possible to appropriately grasp fluctuations in the water quality of the treated water and quickly perform operational control that affects the treatment efficiency of the processing unit in the water treatment system. In particular, by applying this to existing water treatment systems, it becomes possible to streamline maintenance and management related to the operation of water treatment systems and optimize continuous operation.

[0017] Furthermore, in one embodiment of the operation control device of the present invention, when one or more of the evaluation results obtained by the water quality evaluation device described above, namely organic matter concentration, inorganic nitrogen compound concentration, and solid matter concentration, fall outside the threshold, the device performs at least one of the following controls: control of increasing or decreasing the aeration amount and / or the amount of returned sludge in the processing unit, or control of discharging / stopping the discharge of treated water that has undergone treatment by the processing unit. This feature allows for the rapid and appropriate assessment of water quality fluctuations in treated water using a water quality evaluation device. By using the concentration of specific substances as a parameter, it becomes possible to control operations related to improving the treatment efficiency of treated water in the processing unit of the water treatment system, as well as control the timing of treated water discharge. This streamlines the maintenance and management of the water treatment system and reduces the time required for optimization during continuous operation. In particular, applying this to existing water treatment systems makes it even easier to streamline maintenance and management and optimize during continuous operation of the water treatment system. [Effects of the Invention]

[0018] According to the present invention, with regard to water treatment technology, it is possible to provide a water quality evaluation device and a water quality evaluation method that can appropriately grasp fluctuations in the water quality of treated water without any time delay in understanding the water quality of the treated water, and regardless of the skill level of the workers.

[0019] Further, according to the present invention, regarding a water treatment system for treating treated water and an operation control device for the water treatment system, by applying the above-described water quality evaluation device, there is no time delay in grasping the water quality of the treated water, and regardless of the skill level of the operator, it is possible to appropriately grasp the water quality variation of the treated water and smoothly perform maintenance management related to operation. It becomes possible to provide a water treatment system and an operation control device for the water treatment system.

Brief Description of the Drawings

[0020] [Figure 1] It is a schematic explanatory diagram showing the structure of the water quality evaluation device in an embodiment of the present invention. [Figure 2] It is a schematic diagram showing information acquired by the imaging unit of the water quality evaluation device in an embodiment of the present invention. [Figure 3] It is an image diagram showing an example of analysis (calculation) related to water quality evaluation by the water quality evaluation device in an embodiment of the present invention. [Figure 4] It is a graph showing an example of water quality evaluation by the water quality evaluation device in an embodiment of the present invention. [Figure 5] It is a schematic explanatory diagram showing the structure of the water treatment system and the operation control device in an embodiment of the present invention.

Mode for Carrying Out the Invention

[0021] The water quality evaluation device, water quality evaluation method, water treatment system, and operation control device of the present invention are used in water treatment. More specifically, the water quality evaluation device and water quality evaluation method of the present invention are used to grasp the water quality of the treated water to be subjected to water treatment. Further, the water treatment system and operation control device of the present invention use the water quality evaluation device of the present invention to grasp the water quality of the treated water to be subjected to water treatment, and to smooth the maintenance management related to the operation of the water treatment system, which is a facility equipped with a treatment unit for treating the treated water, and to optimize the operation continuation.

[0022] Examples of water to be treated for evaluation and treatment in this invention include sewage, wastewater, sludge-containing water, river water, ocean water, and groundwater. A preferred example of the water to be evaluated and treated in this invention is sewage. Sewage is constantly generated and has adverse effects on the environment, making it difficult to shut down sewage treatment plants, which are water treatment systems that process sewage. Therefore, there is a strong need to quickly and accurately grasp the water quality of the water to be treated, and to ensure stable operation and maintenance of the water treatment system, regardless of the skill level of the workers, and in an energy-saving and manpower-saving manner. In this regard, the water quality evaluation device, water quality evaluation method, water treatment system, and operation control device of the present invention demonstrate their effects remarkably.

[0023] Hereinafter, embodiments of the water quality evaluation apparatus, water quality evaluation method, water treatment system, and operation control device according to the present invention will be described in detail with reference to the drawings. Note that the water quality evaluation method of the present invention will be replaced by the following description of the structure and operation of the water quality evaluation apparatus. Furthermore, the water quality evaluation apparatus, water quality evaluation method, water treatment system, and operation control device described in the embodiments are merely illustrative examples used to illustrate the water quality evaluation apparatus, water quality evaluation method, water treatment system, and operation control device according to the present invention, and are not limited thereto.

[0024] [Water quality evaluation equipment and water quality evaluation method] First, embodiments of the water quality evaluation apparatus and water quality evaluation method of the present invention will be described by illustrating them. Figure 1 is a schematic diagram illustrating the structure of a water quality evaluation device in an embodiment of the present invention. As shown in Figure 1, the water quality evaluation device 1 according to this embodiment comprises an imaging unit 2 and a judgment unit 3. In Figure 1, the dashed arrows indicate connections that allow for the input and output of information (data). The following describes the various components of the water quality evaluation device 1 of this embodiment.

[0025] The imaging unit 2 is for performing an imaging step to capture images of the water to be treated. In addition, the imaging unit 2 is capable of acquiring information from the water to be treated regarding its optical characteristics in a preset specific wavelength band. In other words, the imaging unit 2 performs measurements to acquire information regarding the water quality of the water to be treated. The water to be treated that is measured by the imaging unit 2 can be any water to be treated that is used for water treatment, and specifically, it can be any water to be treated that is introduced into the processing unit 200 in the water treatment system 100 described later.

[0026] In this case, it is preferable that the imaging unit 2 acquires information regarding the water quality of the water to be treated introduced into the processing unit 200 of the water treatment system 100, so-called in-situ observation, without the operation of sampling water. Furthermore, as will be described later, it is preferable that the water to be treated, introduced to the upstream and / or downstream side of the processing unit 200 in the water treatment system 100, be the target of measurement by the imaging unit 2. This makes it easier to quickly and appropriately grasp the water quality of the water to be treated and to smoothly perform appropriate operation control (maintenance) based on the findings when applying the water quality evaluation device 1 of this embodiment to the water treatment system 100 described later.

[0027] The imaging unit 2 of this embodiment only needs to be capable of imaging the water to be treated and acquiring information regarding the optical properties related to a specific wavelength band that has been set in advance. Here, information regarding optical properties refers to information related to the reflection, absorption, and transmission of light of the object being measured (in this embodiment, the water to be treated). For example, the intensity distribution (spectrum) of light resulting from the reflection, absorption, and transmission of light to the object being measured is a suitable example.

[0028] A specific example of the imaging unit 2 in this embodiment is, for example, one that performs measurements based on spectral imaging technology. Spectral imaging technology involves acquiring location information of a measurement target, spectrally analyzing the reflected or transmitted light from the target, collecting the intensity distribution (spectrum) of light at specific wavelengths, and combining the information related to the measurement location with the spectral information at that location to create an image. Depending on the number of wavelengths used (the so-called number of bands), it is classified into multispectral imaging (several to several dozen bands, no continuity of wavelengths) and hyperspectral imaging (several dozen or more bands, continuous wavelength range). Furthermore, techniques that use wavelengths specifically tailored to detect a target substance or object in the measurement target are called target spectral imaging.

[0029] In this embodiment, a suitable instrument for performing measurements based on spectral imaging technology is one that includes a camera (imaging means) to which spectral imaging technology is applied, and which can easily acquire measurement results as image data. More specifically, examples include hyperspectral cameras, multispectral cameras, and target spectral cameras. Measurement based on spectral imaging technology using a camera (imaging means) makes it possible to obtain information from the object being measured without contact. Therefore, it facilitates continuous measurement of the treated water, which is the object being measured, and also reduces the frequency of maintenance (cleaning, etc.) of the imaging unit 2, thus offering the advantage of easy maintenance of the device. In this embodiment, it is particularly preferable to use a target spectral camera as the imaging unit 2. A target spectral camera has a more limited wavelength range (number of wavelengths used for measurement) than a hyperspectral camera; in other words, its functionality is simpler than that of a hyperspectral camera. This makes it possible to quickly acquire information on the water quality of the treated water and to reduce the cost of the imaging unit 2.

[0030] The inventors have found that by performing measurements on the water to be treated in water treatment using an imaging unit 2 based on spectral imaging technology, it is possible to obtain response results (image data) corresponding to the water quality of the water to be treated. Here, "water quality of the water to be treated" in this invention refers to information that can serve as a guideline for determining whether or not a situation requiring special attention has arisen in the water treatment process (operation of the water treatment system) for the water to be treated. In particular, since the water quality evaluation device 1 of this embodiment performs measurements based on spectral imaging technology as the imaging unit 2, it can serve as a guideline for information that is difficult to discern by visual inspection by workers, imaging means that obtain only two-dimensional information (image data) in the visible light region, such as a digital camera (RGB camera), or imaging means that obtain only two-dimensional information (image data) using infrared light, such as an infrared camera. More specifically, examples include the concentration of organic matter and inorganic nitrogen compounds dissolved in the water to be treated, and the presence or absence of foreign matter contamination (metals, oil, etc.) in the water to be treated.

[0031] Figure 2 is a schematic diagram illustrating the information that can be obtained by performing measurements on the treated water based on spectral imaging technology (measurements by the imaging unit 2). Figure 2A is a schematic graph showing the optical properties of substances related to the water quality of the treated water, Figure 2B is a schematic diagram showing the measurement range by the imaging unit 2, and Figure 2C is a schematic graph showing the measurement results (optical properties) by the imaging unit 2. Here, in Figure 2, organic matter dissolved in the treated water and foreign matter mixed in the treated water are used as examples of substances related to the water quality of the treated water, but the explanation is not limited to these.

[0032] Various substances contained in the treated water (organic matter, inorganic nitrogen compounds, foreign matter (metals, oil, etc.)) have different light reflection / absorption bands and light transmittances than the main component of the treated water (H2O), and the response results according to the individual optical properties appear as spectra. As an example, Figure 2A schematically shows a graph showing the optical properties (absorption properties) of substances A and B (both organic matter) and substance C (foreign matter (oil)) related to the water quality of the treated water, with the horizontal axis being wavelength and the vertical axis being relative absorptivity (unit: %). In this case, by setting the wavelength at which the information regarding the optical properties (relative absorptivity in Figure 2) reaches its maximum value (maximum value) for each substance (substance A: λ1, substance B: λ2, substance C: λ3) to a specific wavelength band pre-set in the imaging unit 2, it becomes possible to acquire information related to substances related to the water quality of the treated water.

[0033] Then, as shown in Figure 2B, information regarding the optical characteristics related to a specific wavelength band is acquired within the imaging area of ​​the imaging unit 2. Figure 2C schematically shows graphs of the optical characteristics (absorption characteristics) obtained at each of the three measurement locations ((a) to (c)) in Figure 2B, with the horizontal axis representing wavelength and the vertical axis representing relative absorptivity (unit: %). In this case, if the amounts of substances A, B, and C differ at each measurement location shown in Figure 2B, the measurement results (spectrums) obtained at each measurement location will differ, as shown in Figure 2C. The wavelengths (λ1, λ2, λ3) shown in Figure 2C are wavelengths that show the response results according to the optical properties of each substance, as shown in Figure 2A. From the information (spectrum) related to the optical properties (relative absorptivity) at these wavelengths, it is possible to obtain information about the extent to which substances A to C are present at each measurement location. Furthermore, the information obtained at this time may be presented in the form of image data, showing the absolute values ​​or height differences of the analyzed values ​​using known analysis methods (such as analysis software attached to the equipment or commercially available analysis software). In other words, the information obtained from the imaging unit 2 makes it possible to quickly and accurately determine the water quality of the treated water, which was extremely difficult to determine in conventional maintenance methods such as visual inspection by workers, without requiring any operations related to water sampling.

[0034] The judgment unit 3 is for performing a judgment step to determine the water quality of the water to be treated. More specifically, the judgment unit 3 performs a judgment step to determine the water quality of the water to be treated based on the information (image data, etc.) obtained by the imaging unit 2 described above. The determination unit 3 is connected to the imaging unit 2 so that it can input and output information from the imaging unit 2. This connection may be made directly by wiring or the like, or it may be made indirectly via communication technology such as wireless communication.

[0035] As shown in Figure 2, the information obtained by the imaging unit 2 shows a high correlation with information related to the water quality of the treated water. Therefore, the judgment unit 3 makes a judgment regarding the water quality of the treated water measured at that time, based on this correlation and the information obtained by the imaging unit 2. Here, "judgment regarding the water quality of the treated water" corresponds to "water quality evaluation of the treated water," or in other words, the judgment unit 3 can be said to perform a water quality evaluation of the object measured by the imaging unit 2 (the treated water).

[0036] The decision unit 3 may include a step (step 1) of acquiring information obtained by the imaging unit 2, and a step (step 2) of converting the acquired information into a format that allows for understanding the relationship with information related to the water quality of the treated water. Furthermore, it is preferable that the decision unit 3 is followed by an output unit 4 that performs a step (step 3) of outputting a decision result (water quality evaluation result) related to the water quality of the treated water based on the converted information (data) obtained by the decision unit 3. Furthermore, while the judgment unit 3 may include manual operation by an operator, it is preferable to use a computing device that has data input / output functions for acquiring information related to process 1, creates a program for proceeding with the subsequent process 2, and executes it using a processor such as a CPU. This makes it easier to perform operations related to the judgment of the water quality to be treated accurately and quickly.

[0037] Each step in the decision-making unit 3 will be explained below. Furthermore, the explanation of the process in the determination unit 3 is merely an example of an embodiment and is not limited thereto.

[0038] First, as step 1, the step of acquiring information obtained by the imaging unit 2 is sufficient if it involves collecting measurement results (data) for the object to be measured (water to be treated), as described above. At this time, the timing of data collection may be continuous or at predetermined intervals. Conventional methods for assessing the water quality of treated water, involving visual inspection and water sampling by workers, were based on the results of measurements (judgments) taken at most a few times a day. In contrast, the water quality evaluation device 1 of this embodiment uses an imaging unit 2 that can acquire information quickly and appropriately, making it easy to increase the frequency of information input to the judgment unit 3, and enabling rapid assessment of the water quality of treated water. This makes it possible to appropriately grasp even rapid changes in the water quality of treated water.

[0039] Next, in step 2, the process of converting the acquired information into a form in which the relationship with information related to the water quality of the treated water can be understood can be described as follows: first, information relating to the correlation between the information obtained by the imaging unit 2 (image data, etc.) and the information related to the water quality of the treated water is acquired, and based on this correlation information, calculations are performed to convert the information collected in step 1 (image data from the imaging unit 2, etc.) into information related to the water quality of the treated water. Furthermore, there are no particular limitations on the means for obtaining information in advance regarding the correlation between the information obtained by the imaging unit 2 and the information related to the water quality of the treated water. For example, regarding the correlation between the information obtained by the imaging unit 2 (image data) and the information related to the water quality of the treated water, one could use a computing device that prepares multiple training data (for example, information regarding the optical properties related to a specific wavelength band of a substance related to the water quality of the treated water (information as shown in Figure 2A), and the correlation between optical properties (response results) and the amount of substance present), and generates and executes a machine learning program (learning model) based on this training data. Alternatively, one could use a computing device that automatically generates and executes a predictive model that predicts the correlation between the information obtained by the imaging unit 2 and the information related to the water quality of the treated water based on this training data and learning model.

[0040] A specific example of the decision unit 3 that carries out step 2 is shown in Figure 1, in which a calculation means 3a and a data storage means 3b are provided within the decision unit 3, and the data storage means 3b stores previously acquired information (information relating to the correlation between information obtained by the imaging unit 2 and information related to the water quality of the water to be treated). In this case, step 2 involves inputting the information collected from the imaging unit 2 (image data, etc.) and the information stored in the data storage means 3b into the calculation means 3a, and the calculation means 3a converts the information obtained by the imaging unit 2 into information related to the water quality of the water to be treated.

[0041] In this case, the information related to the water quality of the treated water that is converted by the calculation means 3a represents the characteristics of the water quality of the treated water that are judged (understood) by the judgment unit 3. Here, the water quality of the treated water judged by the judgment unit 3 is preferably at least one selected from organic matter concentration, inorganic nitrogen compound concentration, and foreign matter contamination. This makes it possible to grasp the fluctuations in the water quality of the treated water with judgment criteria similar to, or even better than, those of conventional water quality monitoring involving water sampling or subjective judgment by workers. In other words, the information handled by the calculation means 3a in this embodiment is preferably at least one selected from organic matter concentration, inorganic nitrogen compound concentration, and foreign matter contamination, and as for inorganic nitrogen compound concentration, information related to ammonia concentration is a particularly preferred example. Furthermore, regarding foreign matter contamination, information related to the presence or absence of metals and liquids other than water (such as oil) is included, as well as information related to solid matter concentration.

[0042] The information related to the water quality of the water to be treated, which is converted by the calculation means 3a, can be converted (calculated) from the information obtained by the imaging unit 2, and should directly or indirectly represent the characteristics of the water quality of the water to be treated as described above. Specific examples of information related to the water quality of the water to be treated include organic matter concentration and inorganic nitrogen compound concentration, which can be determined based on the information stored in the data storage means 3b (learning model / prediction model), as well as detection of foreign matter contamination (detection of metals, oil, etc.). In addition, analysis values ​​related to the information acquired by the imaging unit 2 can be used to determine the presence or absence of regions with large differences from the surroundings (exceeding a threshold), and the presence of such regions indicates the occurrence of foreign matter contamination.

[0043] Then, based on the information converted in step 2 of the judgment unit 3, it is preferable to perform a step (step 3) in which a judgment result regarding the water quality of the water to be treated is output. In step 3, the information obtained in step 2 may be output externally as is, but considering the convenience of information use at the output destination, it is preferable to make a judgment regarding the water quality of the water to be treated (whether it is in a good state where no changes or additions to the treatment content are necessary, or whether some kind of action (changes or additions to the treatment content) is necessary), and output the judgment result.

[0044] As a specific example of the means for carrying out step 3, as shown in Figure 1, an output unit 4 is provided after the judgment unit 3, connected so that the results of the calculation means 3a and the information stored in the data storage means 3b can be input, and the judgment result regarding the water quality of the treated water is output externally. In this case, regarding the handling of information in the output unit 4, as described above, the result of the calculation means 3a may be output directly to the outside, but it is preferable to perform calculations regarding the water quality of the treated water from the result of the calculation means 3a and the information stored in the data storage means 3b. Examples of the calculations at this time include obtaining information representing good or bad quality of the treated water (such as a numerical threshold) from the information stored in the data storage means 3b and performing a comparative calculation by comparing it with the result of the calculation means 3a.

[0045] Furthermore, in step 3, when outputting the judgment result regarding the water quality of the treated water, a display means such as a monitor is provided as the output unit 4, and the content of the judgment result is notified to the worker using strings of characters, symbols, etc. via this display means, and notification may also be given by sound or light. In addition, the output unit 4 may issue notifications and alarms, including instructions to workers, based on the judgment results from the judgment unit 3. Specific examples of notification and alarm activation by the output unit 4 include, for example, if the judgment unit 3 determines that foreign matter (oil contamination) has occurred in the treated water, the output unit 4 will display a message indicating that an oil boom should be installed along with the judgment result. Another example is if one or more of the organic matter concentration, inorganic nitrogen compound concentration, or solid matter concentration in the treated water exceeds the concentration assumed (set) for processing in the processing unit 200, the output unit 4 will display a message indicating that unexpected treated water is flowing in. Alternatively, if one or more of the organic matter concentration, inorganic nitrogen compound concentration, or solid matter concentration in the treated water exceeds the discharge standard value, the output unit 4 will display a message indicating that there is a possibility of treated water discharge exceeding the specified limit.

[0046] Furthermore, the content displayed by the display means provided as the output unit 4 is not limited to the content of the judgment result in the judgment unit 3 or instructions for the worker. For example, it may also display information that can be obtained by performing measurements by the imaging unit 2 (the information shown in Figure 2A above) or information obtained in the analysis (calculation) process related to water quality evaluation performed by the judgment unit 3 (the information shown in Figures 3 and 4 described later). This allows the worker to refer not only to the judgment result and instructions based on the judgment result, but also to the information leading up to that judgment, enabling them to perform the work more accurately.

[0047] Furthermore, the judgment results regarding the water quality of the treated water obtained in step 3 (output data from output unit 4) may also be input to the data storage means 3b and used as learning data for forming learning models and prediction models within the data storage means 3b. Furthermore, in order to suppress the decrease in the accuracy of the judgment in the judgment unit 3, a program may be executed periodically or as needed to compare the judgment result regarding the water quality of the treated water from the output unit 4 with the information in the data storage means 3b, and to automatically reshape (reconstruct) the learning model and prediction model.

[0048] Below, we will provide a more detailed explanation of an example of the analysis (calculation) related to water quality evaluation performed by the judgment unit 3 in the water quality evaluation device 1 of this embodiment, based on Figure 3. Here, Figure 3 is an illustrative diagram showing an example of the analysis (calculation) related to water quality evaluation by the water quality evaluation device 1 in this embodiment. Figure 3A is an illustrative diagram showing the distribution of analysis values ​​in the imaging area by the imaging unit 2, and Figure 3B is a schematic representation of the distribution of analysis values ​​in Figure 3A as a histogram.

[0049] First, the information acquired by the imaging unit 2 includes the optical response results in each wavelength band within the imaging area (for example, the wavelength at which the relative absorption rate is at its maximum value (maximum value) for each substance related to the water quality of the treated water (λ1 to λ3 for substances A to C shown in Figure 2)) as measured values. Based on these measured values, the calculation means 3a in the judgment unit 3 derives analytical values ​​for each pixel within the imaging area through known statistical processing. The analytical values ​​derived at this time can be obtained as images (analysis results R1, R2) relating to the distribution of analytical values ​​in the imaging area of ​​the imaging unit 2, as shown in Figure 3A. In Figure 3A, the larger the absolute value of the analytical value, the darker the color (darker color). Furthermore, the analysis results R1 and R2 shown in Figure 3A are conceptual diagrams when dewatered cakes with different moisture content are measured, and the moisture content of analysis result R1 is higher than the moisture content of analysis result R2. Here, obtaining the analysis results R1 and R2 shown in Figure 3A is equivalent to obtaining information related to the solid content in the treated water. Comparing the analysis results R1 and R2 in Figure 3A, we can see that analysis result R1 is represented by a darker color and contains a relatively larger number of analysis values. In other words, Figure 3A qualitatively shows that differences in the water content of the measurement target within the imaging area affect the distribution of analysis values.

[0050] Figure 3B schematically represents a histogram in which the analysis values ​​for analysis results R1 and R2 shown in Figure 3A are plotted on the horizontal axis, and the number of pixels in which these analysis values ​​appear (number of pixels) is plotted on the vertical axis. As shown in Figure 3B, by representing the analysis values ​​for analysis results R1 and R2 as a histogram, it becomes possible to numerically evaluate the difference between analysis results R1 and R2. Furthermore, based on this histogram, the mean and standard deviation of the analytical values ​​within the imaging area under certain conditions are calculated, and a statistical judgment is made (a so-called t-test) to determine whether there is a significant difference between the mean and standard deviation of the analytical values ​​obtained within the imaging area under different conditions. This allows us to demonstrate that the derived analytical values ​​are effective in determining the water quality of the treated water.

[0051] An example of using the derived analytical values ​​(average values ​​of the analytical values) to make a judgment regarding the water quality of the treated water will be explained based on Figure 4. Here, Figure 4 is a graph showing an example of water quality evaluation by the water quality evaluation device in an embodiment of the present invention, and when the object of measurement is a dewatered cake, it shows the correlation between the average value of the analysis obtained by the judgment unit 3 and the information related to the water quality of the treated water (moisture content of the object of measurement). More specifically, Figure 4 shows two graphs: one with the average value of the analysis in the imaging region on the vertical axis and the amount of coagulant added to the target sample on the horizontal axis (hereinafter referred to as "Graph 1"), and another with the water content of the target sample on the vertical axis and the amount of coagulant added to the target sample on the horizontal axis (hereinafter referred to as "Graph 2"). The scale (numerical values ​​and intervals) on the horizontal axis is the same for both Graph 1 and Graph 2.

[0052] As shown in Figure 4, both the average value of the analytical values ​​in the imaging region and the water content of the measured object fluctuate according to the amount of coagulant added to the measured object, and their fluctuation trends are consistent. In other words, by deriving the average value of the analytical values ​​in the imaging region, it is possible to qualitatively evaluate the water content of the measured object. Therefore, in this embodiment, the water quality evaluation device 1 undergoes an analysis (calculation) process based on Figures 3 and 4 as one of the analyses (calculations) related to water quality evaluation performed by the judgment unit 3, making it possible to quickly and appropriately make a judgment (water quality evaluation) regarding the water quality of the treated water.

[0053] Another example of using the derived analytical values ​​(average values ​​of the analytical values) to make a judgment regarding the water quality of the treated water is to pre-measure using the water quality evaluation device 1 with conditions that could serve as a threshold for the water quality of the treated water (for example, aqueous solutions with organic matter concentrations or inorganic nitrogen compound concentrations that can be considered to be of poor water quality in the treated water), and then treat the analytical values ​​(average values ​​of the analytical values) obtained through the analysis (calculation) process based on Figure 3 described above as information related to the threshold (in other words, information related to an index of the limit value that can be accepted as the water quality of the treated water) as information to be stored in the data storage means 3b. Then, by deriving the analytical values ​​(average values ​​of the analytical values) of the measured target and comparing them with the information stored in the data storage means 3b (information set as the threshold), it becomes possible to make a judgment (water quality evaluation) regarding the water quality of the treated water quickly and appropriately.

[0054] As described above, the water quality evaluation device of this embodiment is based on the findings that, as a result of diligent research by the inventors, it is possible to obtain information on the water quality of the water to be treated in water treatment without contact with the water by performing measurements based on measurement technology that enables imaging of the water to be treated and acquisition of information on the optical properties related to a specific wavelength band. This allows for a rapid and appropriate understanding of the water quality of the water to be treated without relying on conventional water quality monitoring involving water sampling or subjective judgment by workers, and in particular, it is possible to appropriately understand rapid changes in water quality. Furthermore, by performing non-contact measurements of the treated water, the water quality evaluation device of the present invention reduces the frequency of maintenance required for the maintenance and management of the device related to water quality monitoring of the treated water, enabling low-cost and stable operation.

[0055] In this embodiment, the water quality evaluation device only needs to include at least a judgment unit 3, to which information regarding the optical characteristics related to a predetermined specific wavelength band is input as information acquired from the water to be treated, and to enable the acquisition (calculation) of a judgment result regarding the water quality of the water to be treated. It is not essential to include an imaging unit 2. However, from the viewpoint of enabling easy non-contact measurement of the water to be treated when acquiring information regarding the water quality of the water to be treated, and making it easy to link the operation of acquiring information regarding the optical characteristics related to a specific wavelength band from the water to be treated with the operation of understanding the water quality of the water to be treated based on this information, it is preferable to include an imaging unit 2 in addition to the judgment unit 3, as shown in Figure 1. This makes it easy to acquire and update the information necessary to understand the water quality of the water to be treated, and makes it easy to appropriately understand the water quality of the water to be treated.

[0056] Furthermore, the water quality evaluation device of this embodiment can quickly and appropriately grasp fluctuations in the water quality of treated water, and is suitable for use in various water treatment technologies. Below, as an example of applying the water quality evaluation device of this embodiment, embodiments relating to a water treatment system and an operation control device for the water treatment system will be described exemplified.

[0057] [Water treatment system] Figure 5 is a schematic diagram illustrating the structure of a water treatment system in an embodiment of the present invention. The water treatment system 100 of this embodiment is equipped with various facilities related to water treatment, and as shown in Figure 5, it includes a water quality evaluation device 1 and a processing unit 200 that processes the water to be treated. Furthermore, in the water treatment system 100 of this embodiment, the processing unit 200 refers to the entire facility involved in the water treatment of the water to be treated. For example, as shown in Figure 5, it may include a grit chamber 210, primary sedimentation tank 220, reaction tank 230, final sedimentation tank 240, and disinfection tank 250, which are general-purpose facilities for sewage treatment plants. In Figure 5, the white arrows indicate the direction of movement (transfer) of the treated water, and the dashed-dotted arrows indicate connections that enable input / output of information (data) or operational (drive) control of each piece of equipment. The following describes the various components of the water treatment system 100 of this embodiment.

[0058] First, regarding the water quality evaluation device 1 provided in the water treatment system 100 of this embodiment, the same device as the water quality evaluation device 1 described above can be used, and a description of its configuration will be omitted.

[0059] Here, Figure 5 shows a configuration in which multiple imaging units 2 are provided in the water quality evaluation device 1, and measurements are taken on the treated water introduced to the upstream and downstream sides of the processing unit 200. Regarding the water to be treated in the water treatment system 100, the information on the water quality of the water to be treated obtained by the water quality evaluation device 1 is useful in making decisions regarding changes to the operation of the processing unit 200 (operating procedures of each piece of equipment, etc.). In particular, the information on the water quality of the water to be treated at the upstream and / or downstream end of the processing unit 200 is of great importance in making decisions regarding the direction of operation of the entire processing unit 200 or a part of it (decisions regarding the necessity of maintaining or changing treatment conditions). More specifically, for example, by quickly and accurately grasping information regarding the water quality of the water to be treated at the upstream end of the processing unit 200, it becomes possible to promptly take appropriate measures regarding the treatment conditions in the processing unit 200 thereafter. Also, for example, by quickly and accurately grasping information regarding the water quality of the water to be treated at the downstream end of the processing unit 200, it becomes possible to grasp whether the treated water (treated water) treated in the processing unit 200 is in a state suitable for discharge outside the system before discharge, and to promptly take appropriate measures as needed. In other words, there is no time delay in grasping the water quality of the water to be treated, and fluctuations in the water quality of the water to be treated can be appropriately grasped regardless of the skill level of the workers. In particular, by quickly grasping water quality fluctuations at specific locations within the processing unit 200, it becomes possible to streamline maintenance and management related to the operation of the water treatment system 100 and optimize its continued operation. On the other hand, the water quality evaluation device 1 provided in the water treatment system 100 of this embodiment only needs to include at least one imaging unit 2, and is not limited to what is shown in Figure 5. For example, considering initial costs and operating costs, any one of the imaging units 2 shown in Figure 5 may be omitted.

[0060] The following describes the various components of the processing unit 200 in the water treatment system 100 of this embodiment, illustrating them with examples. In the following description, the water to be treated is assumed to be sewage, and the processing unit 200 is assumed to be equipped with facilities commonly used in sewage treatment plants, as shown in Figure 5, but it is not limited to this.

[0061] The sedimentation basin 210 is the upstream facility in the processing unit 200, and is where the treated water is separated from the sludge and sand. The specific structure of the grit chamber 210 is not particularly limited, but for example, as shown in Figure 5, a tank body that contains the water to be treated and performs a separation operation from the sludge and sand is provided with a line L1 for introducing the water to be treated and a line L2 for transferring the water to the next stage (primary sedimentation tank 220) after the separation operation, and a transfer pump P is provided on line L2. In this case, the transfer pump P on line L2 may be controlled by a control unit 20, which will be described later, to control the amount of water to be treated transferred from the grit chamber 210 to the primary sedimentation tank 220. Although not shown in Figure 5, the sedimentation tank 210 may also be equipped with facilities for separating and recovering sediment and sand (such as screens and sand lifters).

[0062] Furthermore, as shown in Figure 5, the sedimentation tank 210 is equipped with the imaging unit 2 of the water quality evaluation device 1. As described above, the sedimentation tank 210 is located at the upstream end of the processing unit 200, and by quickly and accurately obtaining information on the water quality of the water to be treated at this location, it becomes possible to promptly take appropriate measures regarding the treatment conditions in the processing unit 200 thereafter. In particular, the retention time of treated water in the grit chamber 210, which is commonly used in sewage treatment plants, is generally much shorter than in other treatment areas 200. With conventional methods, it has been difficult to accurately obtain information on the water quality of the treated water at this location without delay. On the other hand, by using the water quality evaluation device 1 of this embodiment, it is possible to grasp the water quality of the treated water in the grit chamber 210 without any delay, and to appropriately grasp fluctuations in the water quality of the treated water regardless of the skill level of the workers.

[0063] The primary sedimentation tank 220 receives the water to be treated from the grit tank 210 via line L2, and is used to separate and settle the heavier suspended solids (sludge) from this water. The specific structure of the primary sedimentation tank 220 is not particularly limited, but it is preferable to provide, for example, a tank body that contains the water to be treated from the grit tank 210 via line L2, a line L3 that transfers the water to be treated after the sedimentation and separation operation to the next stage (reaction tank 230), and a mechanism for recovering and discharging the sludge that has settled at the bottom of the tank body.

[0064] The reaction tank 230 is for performing biological treatment on the water to be treated from the primary sedimentation tank 220. In this embodiment, a suitable example of the reaction tank 230 is one that performs biological treatment (aerobic treatment) under aerobic conditions to decompose organic matter in the water to be treated. The specific structure of the reaction tank 230 is not particularly limited, but for example, as shown in Figure 5, it may include a tank body that contains the water to be treated from the primary sedimentation tank 220 via line L3, an aeration means 231 (such as a diffuser) for efficiently carrying out aerobic treatment, and line L4 for transferring the water to be treated in the tank body to the next stage (final sedimentation tank 240). In this case, the blower B in the aeration means 231 may be controlled by the control unit 20, which will be described later, and control the amount of aeration in the reaction tank 230. Furthermore, Figure 5 illustrates a configuration in which an aeration means 231 is provided as a means to carry out aerobic treatment in the reaction tank 230, but the system is not limited to this. For example, instead of the aeration means 231, a stirring means equipped with stirring blades may be provided to stir the water to be treated, thereby creating aerobic conditions in the reaction tank 230 and carrying out aerobic treatment. Alternatively, the reaction tank 230 may consist of multiple tank bodies, each equipped with either an aeration means 231 or a stirring means, arranged in parallel. When a stirring means other than the aeration means 231 is used, the control target of the control unit 20, which will be described later, may be the drive motor that drives the stirring means (stirring blades, etc.).

[0065] The final sedimentation tank 240 is used to separate and precipitate microbial flocs (sludge) generated in the reaction tank 230 from the treated water from the reaction tank 230. The specific structure of the final sedimentation tank 240 is not particularly limited, but for example, it may include a tank body that contains the water to be treated from the reaction tank 230 via line L4, a line L5 that transfers the water to be treated after the sedimentation and separation operation to the next stage (disinfection tank 250), and a sludge return means 241 that returns a portion of the sludge that has settled at the bottom of the tank body to the reaction tank 230. In this case, a return pump 242 may be provided as the sludge return means 241 on the line L6 connecting the final sedimentation tank 240 and the reaction tank 230, and this return pump 242 may be controlled by the control unit 20 described later, and the amount of sludge returned to the reaction tank 230 may be controlled.

[0066] The disinfection tank 250 is the downstream equipment in the processing unit 200, and disinfectant solutions such as sodium hypochlorite are injected into the water to be treated from the final sedimentation tank 240 to perform sterilization. The specific structure of the disinfection tank 250 is not particularly limited, but for example, as shown in Figure 5, it may include a tank body that contains the water to be treated from the final sedimentation tank 240 via line L5, and line L7 that discharges the water to be treated after the disinfection operation as treated water outside the system. Although not shown in Figure 5, the disinfection tank 250 shall also be equipped with equipment for injecting disinfectant solution.

[0067] In this case, it is preferable to provide a flow path switching means 260 in line L7 as a means for performing operations related to the discharge / stopping of treated water. The flow path switching means 260 can be any means that stops all or part of the discharge of treated water from the disinfection tank 250 through line L7, or returns or stores the treated water to the disinfection tank 250 or other processing units 200. For example, this could be done by providing an openable / closable gate (valve) on line L7, or by providing piping (e.g., lines L8 and L9) that branches off from line L7 and connects to any facility in the processing unit 200 for returning or storing treated water. In this case, it is preferable that the drive and operation of the flow path switching means 260 be controlled by the control unit 20, which will be described later. For example, a suitable example of a flow path switching means 260 is to use an openable / closable gate (valve) on line L7 that can be opened and closed in response to an externally input signal, or to provide a switching valve (electric valve, electric three-way valve, etc.) at the connection point between the piping branching off from line L7 and line L7 that enables switching of the flow path in response to an externally input signal.

[0068] As examples of piping related to the flow path switching means 260, line L8, which branches off from line L7 and connects to the upstream side of the reaction tank 230, and line L9, which branches off from line L7 and connects to the upstream side of the primary sedimentation tank 220, are given, but the piping is not limited to these. In this case, the primary sedimentation tank 220 connected to line L9 may be an operational primary sedimentation tank 220 or a deactivated primary sedimentation tank 220. When line L9 is connected to an operational primary sedimentation tank 220, the treated water is used for further treatment within the processing unit 200 system from the primary sedimentation tank 220. On the other hand, when line L9 is connected to a deactivated primary sedimentation tank 220, the treated water can be temporarily stored without affecting the water treatment process proceeding within the processing unit 200 system. Therefore, if the amount of treated water transferred via line L9 does not affect the processing capacity (processing efficiency) of the primary sedimentation tank 220 (the amount of treated water transferred is small), it is preferable to return the treated water to the operational primary sedimentation tank 220. On the other hand, if the amount of treated water transferred via line L9 affects the processing capacity (processing efficiency) of the primary sedimentation tank 220 (the amount of treated water transferred is large), it is preferable to transfer the treated water to a deactivated primary sedimentation tank 220 and temporarily store it in a state separate from the water treatment process proceeding within the processing unit 200 system.

[0069] Furthermore, as shown in Figure 5, the disinfection tank 250 is equipped with the imaging unit 2 of the water quality evaluation device 1. As described above, the disinfection tank 250 is located at the downstream end of the processing unit 200, and by quickly and accurately obtaining information on the water quality of the water to be treated at this location, it is possible to determine whether the water to be treated (treated water) treated in the processing unit 200 is in a state suitable for discharge outside the system before discharge, and to promptly take appropriate action as needed. In particular, the retention time of treated water in the disinfection tank 250, which is commonly used in sewage treatment plants, is generally much shorter than that of other treatment areas 200, similar to the sedimentation tank 210 described above. Therefore, it has been difficult to obtain accurate information regarding the water quality of the treated water at this location without delay using conventional methods. On the other hand, by using the water quality evaluation device 1 of this embodiment, it is possible to grasp the water quality of the treated water in the disinfection tank 250 without any delay, and to appropriately grasp fluctuations in the water quality of the treated water regardless of the skill level of the workers.

[0070] The water treatment system 100 of this embodiment includes a control unit 20 that controls the processing of the processing unit 200 based on the evaluation results obtained by the water quality evaluation device 1 described above. More specifically, the water treatment system 100 of this embodiment preferably includes a control unit 20 that controls at least one of the following, based on the information regarding the water quality of the water to be treated obtained from the water quality evaluation device 1 described above, which have a significant impact on the water quality of the water to be treated: the amount of water to be treated transferred in the processing unit 200, the amount of aeration by the aeration means 231 in the reaction tank 230, the amount of sludge returned from the final sedimentation tank 240 to the reaction tank 230, and operations related to the discharge / stopping of treated water after processing by the processing unit 200. By performing operation control via the control unit 20, the water treatment system 100 of this embodiment can appropriately grasp fluctuations in the water quality of the water to be treated and quickly perform operation control related to adjusting various parameters that affect the processing efficiency of the processing unit 200, thereby facilitating smooth maintenance and management of the operation of the water treatment system 100 or facilitating optimization during continuous operation of the water treatment system 100.

[0071] In this embodiment, the control unit 20 only needs to be capable of controlling at least one of the following: the amount of water to be treated transferred in the processing unit 200, the amount of aeration by the aeration means 231 in the reaction tank 230, the amount of sludge returned from the final sedimentation tank 240 to the reaction tank 230, and operations related to the discharge / stopping of treated water after treatment by the processing unit 200. In other words, among the equipment and mechanisms provided in the water treatment system 100, the equipment and mechanisms to be controlled only need to be capable of controlling at least one of the following: the amount of water to be treated transferred in the processing unit 200, the amount of aeration by the aeration means 231 in the reaction tank 230, the amount of sludge returned from the final sedimentation tank 240 to the reaction tank 230, and operations related to the discharge / stopping of treated water after treatment by the processing unit 200. Furthermore, a suitable example of the amount of water to be treated transferred within the processing unit 200, which is controlled by the control unit 20, is the amount of water transferred from the sedimentation tank 210 to the primary sedimentation tank 220. This allows the amount of water to be treated transferred to the processing unit 200 beyond the sedimentation tank 210 to be controlled based on the judgment results of the water quality evaluation device 1, making it easier to optimize responses related to the operation of the processing unit 200 (such as changes in treatment content). Furthermore, if a stirring means is provided in place of the aeration means 231 in the reaction tank 230, the amount of drive of the stirring means (the amount of rotation of the stirring blades) is controlled by the control unit 20 instead of the amount of aeration in the reaction tank 230.

[0072] Specific examples of controls controlled by the control unit 20 in this embodiment include, as shown in Figure 5, the drive control of the transfer pump P provided on line L2 connecting the grit tank 210 and the primary sedimentation tank 220, the drive control of the blower B related to the aeration means 231 in the reaction tank 230, the drive control of the return pump 242 provided on line L6 as a sludge return means 241 from the final sedimentation tank 240 to the reaction tank 230, and the control of flow path switching by the flow path switching means 260 related to the discharge of treated water from the disinfection tank 250 via line L7.

[0073] An example of the operation control in the control unit 20 of this embodiment is the control of increasing or decreasing the aeration amount and / or the amount of returned sludge in the processing unit 200, or the control of discharging / stopping the discharge of treated water that has been treated by the processing unit 200, when one or more of the organic matter concentration, inorganic nitrogen compound concentration, and solid matter concentration are found to be outside the threshold as measured by the water quality evaluation device 1. More specifically, if the water quality evaluation device 1 determines that one or more of the organic matter concentration, inorganic nitrogen compound concentration, and solid matter concentration exceed a threshold, and the water quality of the treated water is judged to be poor, the control unit 20 of this embodiment will perform operational control related to the driving of the blower B and return pump 242 to increase the aeration amount of the aeration means 231 in the reaction tank 230, or to increase the amount of sludge returned from the final sedimentation tank 240 to the reaction tank 230. In addition, regarding the discharge of treated water from the disinfection tank 250 via line L7, the control unit 20 will perform operational control related to the switching of the flow path by the flow path switching means 260 to stop all or part of the discharge, or to return or store the treated water to the disinfection tank 250 or other processing units 200. This makes it possible to streamline maintenance and management of the operation of the water treatment system 100 and reduce the time required for optimization during continuous operation by using the concentration of specific substances as a parameter among the water quality fluctuations of the treated water that can be quickly and appropriately grasped by the water quality evaluation device 1, and by performing at least one control related to operations that improve the treatment efficiency of the treated water in the processing unit 200 of the water treatment system 100, or controls related to the timing of discharge of treated water.

[0074] The operation control by the control unit 20 described above may include manual operation by an operator, but from the viewpoint of reducing the workload of the operator, it is preferable to make it capable of automatic control. Specifically, the control unit 20 can be automated by using a computing device that executes a program on a CPU or other processor to run a program necessary for sending control signals related to at least one of the following operations: acquiring information from the water quality evaluation device 1 (acquiring judgment results related to the water quality of the water to be treated), the amount of water to be treated transferred in the processing unit 200, the amount of aeration by the aeration means 231 in the reaction tank 230, the amount of sludge returned from the final sedimentation tank 240 to the reaction tank 230, and operations related to the discharge / stopping of treated water from the disinfection tank 250 via line L7.

[0075] Furthermore, when operating (maintaining) the water treatment system 100 based on the judgment results obtained from the water quality evaluation device 1, in addition to the operation control of each piece of equipment related to the processing unit 200 by the control unit 20, response means may also be provided in response to notifications and alarms, including instructions to workers, output from the output unit 4 of the water quality evaluation device 1. Specifically, if the water quality evaluation device 1 determines that foreign matter (oil contamination) has occurred in the sedimentation tank 210 or disinfection tank 250, the output unit 4 will issue an alert to install an oil fence, and components and equipment (oil fence, chemical injection means, etc.) for removing foreign matter (oil) will be placed in the downstream equipment (primary sedimentation tank 220) of the sedimentation tank 210. In addition, if the water quality evaluation device 1 determines that foreign matter (oil contamination) has occurred in the sedimentation tank 210 or disinfection tank 250, operations related to stopping the discharge of treated water, returning it to the processing unit 200, or storing it may also be performed in conjunction with the placement of the oil fence, etc.

[0076] [Operation control device for water treatment systems] Furthermore, the control unit 20 of this embodiment may be combined with the water quality evaluation device 1 described above to form an operation control device 10 independent of the water treatment system 100. This operation control device 10 can be applied to existing water treatment systems equipped with equipment and mechanisms that adjust at least one of the following: the amount of water to be treated transferred in the processing unit 200, the amount of aeration by the aeration means 231 in the reaction tank 230, the amount of sludge returned from the final sedimentation tank 240 to the reaction tank 230, and operations related to the discharge / stopping of treated water after treatment by the processing unit 200. As a result, even in existing water treatment systems, there is no time delay in understanding the water quality of the water to be treated, and regardless of the skill level of the workers, it is possible to quickly perform operation control related to the treatment efficiency of the processing unit 200 in the water treatment system 100 after appropriately understanding fluctuations in the water quality of the water to be treated. More specifically, by applying the operation control device 10 of this embodiment to a water treatment system 100 equipped with a processing unit 200, it becomes possible to control the operation of at least one of the following: the amount of water to be treated transferred in the processing unit 200, the amount of aeration by the aeration means 231 in the reaction tank 230, the amount of sludge returned from the final sedimentation tank 240 to the reaction tank 230, and operations related to the discharge / stopping of discharge of treated water after treatment by the processing unit 200. This makes it possible to smoothly perform maintenance and management related to the operation of the water treatment system.

[0077] Furthermore, as described in the explanation relating to the control unit 20, it is preferable that the operation control device 10 of this embodiment performs at least one control, such as controlling the increase or decrease of the aeration amount and / or the amount of returned sludge in the processing unit 200, or controlling the discharge / stop of discharge of treated water that has undergone treatment by the processing unit 200, when one or more of the evaluation results obtained by the water quality evaluation device 1 described above, such as organic matter concentration, inorganic nitrogen compound concentration, and solid matter concentration, fall outside the threshold. As a result, the operation control device 10 can use the concentration of a specific substance as a parameter among the water quality fluctuations of the treated water that can be quickly and appropriately grasped by the water quality evaluation device 1, and can perform at least one control related to operations that improve the treatment efficiency of the treated water in the processing unit 200 of the water treatment system 100, or control related to the timing of discharge of treated water. This makes it possible to streamline the maintenance and management of the operation of the water treatment system 100 and shorten the time required for optimization in continuous operation. In particular, by applying the operation control device 10 of this embodiment to an existing water treatment system, it becomes even easier to streamline the maintenance and management of the operation of the water treatment system and optimize in continuous operation.

[0078] As described above, the water treatment system and the operation control device of the water treatment system of this embodiment can grasp changes in the water quality of the water to be treated without any time delay in grasping the water quality, and can appropriately grasp changes in the water quality of the water to be treated regardless of the skill level of the workers. In particular, by quickly grasping changes in water quality at specific locations within the processing unit, it is possible to streamline maintenance and management related to the operation of the water treatment system and optimize the continuation of operation. Furthermore, the water treatment system and the operation control device for the water treatment system of this embodiment are particularly suitable for use in the treatment of water to be treated, such as sewage, which is constantly generated and for which it is difficult to stop the operation of the equipment involved in the treatment.

[0079] The embodiments described above are merely examples of a water quality evaluation device, a water quality evaluation method, a water treatment system, and an operation control device. The water quality evaluation device, water quality evaluation method, water treatment system, and operation control device according to the present invention are not limited to the embodiments described above, and the water quality evaluation device, water quality evaluation method, water treatment system, and operation control device according to the embodiments described above may be modified without changing the gist of the claims. [Industrial applicability]

[0080] The water quality evaluation apparatus and water quality evaluation method of the present invention are suitably used for the rapid and appropriate acquisition of information regarding the water quality of treated water. Furthermore, the water treatment system and the operation control device for the water treatment system of the present invention are suitably used in various water treatment technologies, particularly in sewage treatment technologies. [Explanation of Symbols]

[0081] 1 Water quality evaluation device, 2 Imaging unit, 3 Judgment unit, 3a Calculation means, 3b Data storage means, 4 Output unit, 10 Operation control device (of the water treatment system), 20 Control unit, 100 Water treatment system, 200 Processing unit, 210 Grit tank, 220 Primary sedimentation tank, 230 Reaction tank, 231 Aeration means, 240 Final sedimentation tank, 241 Sludge return means, 242 Return pump, 250 Disinfection tank, 260 Flow path switching means, L1~L9 lines, B Blower, P Transfer pump

Claims

1. A water quality evaluation device characterized by having a determination unit that determines the water quality of the water to be treated based on information regarding the optical properties related to a predetermined specific wavelength band, which is obtained from the water to be treated.

2. The water quality evaluation apparatus according to claim 1, further comprising an imaging unit for acquiring the aforementioned information.

3. The water quality evaluation apparatus according to claim 1, characterized in that the water quality of the treated water to be determined by the determination unit is at least one selected from organic matter concentration, inorganic nitrogen compound concentration, and foreign matter contamination.

4. The water quality evaluation apparatus according to claim 1, further comprising an output unit for outputting the judgment result from the judgment unit to an external source.

5. A water quality evaluation method characterized by comprising a judgment step that determines the water quality of the water to be treated based on information regarding the optical properties related to a predetermined specific wavelength band, which is obtained from the water to be treated.

6. A water quality evaluation apparatus according to any one of claims 1 to 4, It comprises a processing unit for treating the water to be treated, A water treatment system characterized in that the water quality evaluation device uses information obtained from the water to be treated, which is introduced to the upstream and / or downstream side of the processing unit.

7. The water treatment system according to claim 6, further comprising a control unit that controls the processing of the processing unit based on the evaluation results obtained by the water quality evaluation device.

8. The water to be treated is sewage, The aforementioned processing unit includes a sedimentation tank and a disinfection tank. The water treatment system according to claim 6, characterized in that the water quality evaluation device uses information obtained from the water to be treated introduced into the sedimentation tank and / or disinfection tank.

9. A water quality evaluation apparatus according to any one of claims 1 to 4, An operation control device characterized by performing operation control of a water treatment system equipped with a processing unit for treating water to be treated, based on evaluation results obtained by the aforementioned water quality evaluation device.

10. The operation control device according to claim 9, characterized in that when one or more of the evaluation results obtained by the water quality evaluation device fall below a threshold value among organic matter concentration, inorganic nitrogen compound concentration, and solid matter concentration, at least one of the following controls is performed: control of increasing or decreasing the aeration amount and / or the amount of returned sludge in the processing unit, or control of discharging / stopping the discharge of treated water that has undergone treatment by the processing unit.

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