Biological treatment system, biological treatment device, water purification system, biological treatment method, and water purification method

Abstract

To provide a biological treatment system, a biological treatment apparatus, a water purification system, a biological treatment method and a water purification method that are excellent in the efficiency and stability of biological treatment.SOLUTION: A biological treatment system comprises: a tank 1 containing a mixture of an object to be biologically treated and microorganisms; a monitoring unit 2 that monitors an index of a microbial concentration of the mixture; an adjustment unit 3 that adjusts the microbial concentration of the mixture; and a control unit 4 that controls the adjustment unit based on monitoring results of the index of the microbial concentration.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present disclosure relates to a biological treatment system, a biological treatment device, a water purification system, a biological treatment method, and a water purification method. [Background technology]

[0002] Systems for purifying wastewater using microorganisms are being applied in a variety of fields. For example, Patent Document 1 describes a circulating flush toilet that is equipped with a mechanism for purifying wastewater discharged from a flush toilet and circulating the sewage to the flush toilet bowl.

[0003] The circulating flush toilet described in Patent Document 1 has a biological treatment system that decomposes organic matter in wastewater and performs nitrification and denitrification treatment, a filtration tank that separates the biologically treated water that has been biologically treated in the biological treatment system into solid and liquid, and a decolorization tank that decolorizes the filtrate that has been separated into solid and liquid in the filtration tank, and reuses the treated water that has been decolorized in the decolorization tank as flush water for the flush toilet. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2004-132037 A Summary of the Invention [Problem to be solved by the invention]

[0005] In recent years, with the diversification of lifestyles and living environments, water purification systems using microorganisms are increasingly being introduced into relatively small facilities such as houses. In such small-scale water purification systems, the amount and timing of wastewater supplied to the biological treatment system tend to be irregular. In addition, because the capacity of the biological treatment system is small, the conditions inside the biological treatment system tend to fluctuate depending on the amount and timing of the wastewater supplied. The fluctuations in the environment inside the biological treatment system may cause a decrease in the biological treatment capacity of the microorganisms, leading to a decrease in treatment efficiency. In particular, in circulating water treatment systems, a small amount of water needs to be biologically treated to achieve a water quality that meets the needs of users, and a decrease in treatment efficiency is a major problem. Therefore, an object of the present disclosure is to provide a biological treatment system, a biological treatment device, a water purification system, a biological treatment method, and a water purification method that are excellent in biological treatment efficiency and stability. [Means for solving the problem]

[0006] Means for solving the above problems include the following embodiments. <1> A tank for accommodating a mixture of a material to be biologically treated and microorganisms; a monitoring unit for monitoring an indication of a microbial concentration of the mixture; A regulator for regulating the microbial concentration of the mixture; A control unit that controls the adjustment unit based on the monitoring results of the indicator of the microbial concentration. <2> The adjusting unit has a function of supplying a nutrient source for microorganisms to the mixture. <1> The biological treatment system according to claim 1. <3> The adjustment unit has a function of supplying ozone to the mixture. <1> The biological treatment system according to claim 1. <4> A tank for accommodating a mixture of a material to be biologically treated and microorganisms; a monitoring unit for monitoring an indication of a microbial concentration of the mixture; A regulator for regulating the microbial concentration of the mixture; A control unit that controls the adjustment unit based on a monitoring result of the index of microbial concentration. <5> <1> ~ <3> The biological treatment system according to any one of claims 1 to 5, <4> A water purification system comprising the biological treatment device according to claim 1. <6> A step of monitoring an indicator of a microbial concentration of a mixture contained in a tank containing a mixture of a target material for biological treatment and microorganisms; adjusting the microbial concentration of the mixture; A biological treatment method, wherein the adjustment of the microbial concentration is controlled based on a monitoring result of an indicator of the microbial concentration. <7> The indicator of microbial concentration includes at least one selected from the group consisting of MLSS and OUR; <6> The biological treatment method according to claim 1. <8> <6> A water purification method comprising a step of carrying out the biological treatment method described in claim 1. Effect of the Invention

[0007] According to the present disclosure, a biological treatment system, a biological treatment device, a water purification system, a biological treatment method, and a water purification method that are excellent in biological treatment efficiency and stability are provided. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is a conceptual diagram showing an example of a configuration of a biological treatment system. [Diagram 2] FIG. 2 is a conceptual diagram showing an example of the configuration of a control unit. [Diagram 3] FIG. 13 is a diagram showing an example of a process in which a control unit determines an instruction to an adjustment unit based on a monitoring result received from a monitoring unit. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] In the present disclosure, a numerical range indicated using "~" indicates a range that includes the numerical values ​​before and after "~" as the minimum and maximum values, respectively. In the numerical ranges described in stages in this disclosure, the upper or lower limit value described in a certain numerical range may be replaced by the upper or lower limit value of another numerical range described in stages, or may be replaced by a value shown in the examples.

[0010] <Biological treatment system> The biological treatment system of the present disclosure includes: A tank for accommodating a mixture of a material to be biologically treated and microorganisms; a monitoring unit for monitoring an indication of a microbial concentration of the mixture; A regulator for regulating the microbial concentration of the mixture; and a control unit that controls the adjustment unit based on the monitoring results of the index of microbial concentration.

[0011] The treatment efficiency of a biological treatment system is affected by the quantitative balance between the material to be treated and the microorganisms. For example, if the amount of material to be treated is too small compared to the amount of microorganisms, the microorganisms that use the material to be treated as a nutrient source will die out, reducing the treatment capacity of the biological treatment system. On the other hand, if the amount of material to be treated is too large compared to the amount of microorganisms, the amount of material that cannot be treated by the microorganisms will increase. As a result, there are cases where the material supplied to the biological treatment system is not treated at the specified pace. Therefore, in order to carry out biological treatment stably and efficiently, it is effective to reduce fluctuations in the quantitative balance between the target of biological treatment and the microorganisms. In particular, the smaller the scale of a biological treatment system, the greater the fluctuations in the amount of material supplied and the water quality. Therefore, the smaller the scale of the biological treatment system, the greater the significance of taking measures to ensure stable and efficient biological treatment. The biological treatment system of the present disclosure has a daily treatment capacity of 1,000 m 3 It is particularly useful for very small scale applications such as:

[0012] One method for reducing the fluctuation in the quantitative balance between the material to be treated and the microorganisms is to level out the amount and timing of the material to be treated to be supplied to the biological treatment system. However, depending on the capacity and usage pattern of the biological treatment system, it may be difficult to level out the amount and timing of the material to be treated.

[0013] The biological treatment system of the present disclosure is equipped with a mechanism consisting of a monitoring unit, an adjusting unit, and a control unit, and is therefore capable of controlling the microbial concentration in the tank with a desired degree of accuracy, thereby enabling stable biological treatment to be carried out even when there are large fluctuations in the supply amount and timing of the material to be treated.

[0014] Fig. 1 is a schematic diagram of a biological treatment system according to the present disclosure, in which devices typically provided in a biological treatment system, such as an aeration device, an agitator, and a pump, are omitted. The biological treatment system shown in FIG. 1 includes a tank 1 for accommodating a mixture of a material to be biologically treated and microorganisms, A monitoring unit 2 that monitors an indicator of the microbial concentration of the mixture; Adjustment units 3a and 3b for adjusting the microbial concentration of the mixture; and a control unit 4 that controls the adjustment unit based on the monitoring results of the microbial concentration index. The adjusting unit 3a has a function of increasing the microbial concentration of the mixture, for example, a nutrient source supplying device that supplies organic nutrient sources to the tank. The adjustment unit 3b has a function of reducing the microbial concentration of the mixture, for example, an ozone generator that supplies ozone to the tank.

[0015] The monitoring unit 2 monitors an indicator of the microbial concentration of the mixture in the tank, and transmits the monitoring result to the control unit 4 by a signal transmission means 11. The control unit 4 transmits a command to the drive device 5a or 5b of the adjustment unit 3a or 3b by a signal transmission means 12a or 12b. When the driving device 5a receives a command from the control unit 4, the adjustment unit 3a introduces organic nutrient sources into the tank. When the driving device 5b receives a command from the control unit 4, the adjustment unit 3b supplies ozone into the tank.

[0016] The configuration shown in FIG. 1 is an example conceptually showing the configuration of a biological treatment system, and the specific configuration of the present disclosure is not limited to the configuration shown in FIG. For example, a plurality of monitoring units 2 may be provided in the tank 1. In addition, the adjustment unit 3 may have only one function of increasing or decreasing the microbial concentration of the mixture, or may have both functions.

[0017] The biological treatment systems of the present disclosure may or may not be separate entities. When the biological treatment system is an independent object, it may be in a movable state. For example, it may be in a state where it can be transported to a predetermined location and used during camping, disaster evacuation, etc. In addition, the biological treatment system of the present disclosure may be a module (a standardized structural unit that facilitates recombination) that constitutes a water treatment system. An example of a biological treatment system that is not an independent object is one that is incorporated as part of a structure or an object other than a structure. Examples of objects other than buildings include, but are not limited to, automobiles, trains, ships, aircraft, trailer houses, etc.

[0018] (tank) The tank of the biological treatment system of the present disclosure may be a container of a desired size. The material of the container is not particularly limited and may be selected from resins, metals, ceramics, and the like. The upper limit of the amount of the mixture contained in the tank is not particularly limited and can be selected depending on the application of the biological treatment system. For example, the upper limit of the amount of the mixture contained in the tank may be any of 10,000 liters, 5,000 liters, 1,000 liters, 500 liters, 300 liters, 150 liters, and 50 liters. The lower limit of the amount of the mixture contained in the tank is not particularly limited and can be set depending on the method of use of the biological treatment system, etc. From the viewpoint of performing effective biological treatment, the lower limit of the amount of the mixture contained in the tank may be 10 liters.

[0019] The mixture contained in the tank contains at least a target of biological treatment and microorganisms. The object of biological treatment may contain liquid and solid components, or may contain only liquid components. The target of biological treatment contained in the mixture is not particularly limited. Examples include domestic wastewater discharged from homes and small settlements such as toilets, kitchens, and bathrooms, urban wastewater, commercial facility wastewater, agricultural wastewater, and industrial wastewater. The type of microorganism contained in the mixture is not particularly limited. For example, the microorganism may be either aerobic bacteria or anaerobic bacteria, or a combination thereof. Specific examples of the microorganisms contained in the mixture include nitrifying bacteria, yeast, Escherichia coli, denitrifying bacteria, phosphorus-depleting bacteria, and denitrifying phosphorus-accumulating bacteria.

[0020] (Monitoring Department) The biological treatment system of the present disclosure includes a monitoring unit that monitors an indicator of the microbial concentration of the mixture. The indicator of the microbial concentration to be monitored by the monitoring unit is not particularly limited. Specific examples of the indicator of the microbial concentration include MLSS (activated sludge suspended solids), OUR (oxygen consumption rate), MLVSS (activated sludge organic suspended solids), SS (suspended solids), SV (activated sludge settling rate), BOD (biochemical oxygen demand), COD (chemical oxygen demand), TOC (total organic carbon), turbidity, and dissolved oxygen concentration (DO). In the present disclosure, the "indicator of microbial concentration" includes the microbial concentration of the mixture itself and information that indirectly contributes to understanding the microbial concentration. The indicator of microbial concentration may be an actual measured value or a converted value such as an index or rate of change. The indicator of the microbial concentration to be monitored may be one type alone or a combination of two or more types.

[0021] From the viewpoint of accurately evaluating the microbial concentration of a mixture, it is preferable that the indicator of the microbial concentration includes the actual measured value (absolute value) of the MLSS concentration, or the rate of change calculated from the relative change in the MLSS concentration. The means for monitoring the MLSS concentration is not particularly limited, and known devices can be used.

[0022] Indicators of microbial concentration may include OUR. Aerobic microorganisms consume oxygen to decompose organic matter contained in a mixture, so the microbial concentration of a mixture can be indirectly determined by the actual measured value (absolute value) of OUR, or by the trend or rate of change. The means for measuring OUR is not particularly limited, and known devices can be used.

[0023] The monitoring of the indicator of microbial concentration by the monitoring unit may be performed continuously or intermittently. When the monitoring unit intermittently monitors the indicator of the microbial concentration, the length of the period during which monitoring is not performed is not particularly limited, and may be selected from the range of one hour to one week, for example.

[0024] The monitoring portion may be fully automatic or a combination of automatic and manual monitoring of the microbial concentration indicator. In a case where the microbial concentration index is monitored completely automatically, a device having a function for automatically monitoring the microbial concentration index may be used. In addition, the microbial concentration index may be automatically monitored at a frequency and timing set based on learned data learned from the usage tendency of the biological treatment system of the present disclosure. In a case where the monitoring of the indicator of the microbial concentration is performed by a combination of automatic and manual means, the monitoring unit itself does not perform the monitoring, but notifies an operator that the indicator of the microbial concentration should be monitored.

[0025] (Adjustment part) The biological treatment system of the present disclosure includes a regulator that regulates the microbial concentration of the mixture. The adjustment of the microbial concentration of the mixture by the adjustment section includes increasing the microbial concentration of the mixture and decreasing the microbial concentration of the mixture. By increasing the microbial concentration of the mixture when it falls below the lower limit of the set range and decreasing the microbial concentration when it exceeds the upper limit of the set range, the microbial concentration of the mixture can be kept within an appropriate range, thereby achieving stable biological treatment.

[0026] A specific example of a procedure for increasing the concentration of microorganisms is adding a nutrient source for the microorganisms to the mixture. By providing the mixture with a nutrient source for the microorganisms, the death of the microorganisms can be inhibited and the viability can be restored. The type of nutrient source for the microorganisms added to the mixture is not particularly limited as long as it is an organic matter that the microorganisms can decompose. From the viewpoint of immediate effect, organic matter with a small molecular weight, such as alcohols such as ethanol, sugars, etc., is preferred.

[0027] A specific example of an operation for reducing the microbial concentration in the control device is supplying ozone to the mixture. By supplying ozone to the mixture, microorganisms that come into contact with the ozone are killed, and the condition in which there are an excessive number of microorganisms can be eliminated. In addition, ozone can be supplied to a portion of the mixture depending on how the ozone generator is installed. Therefore, the amount of microorganisms to be killed can be controlled with greater precision than when the aeration of the biological treatment system is stopped to kill microorganisms due to lack of oxygen.

[0028] The adjustment of the microbial concentration by the adjustment unit may be performed continuously or intermittently. When the adjustment unit adjusts the microbial concentration intermittently, the length of the period during which adjustment is not performed is not particularly limited, and may be selected, for example, from the range of one hour to one week.

[0029] The control unit may be a fully automatic unit for controlling the addition of nutrients to the microorganisms or a combination of automatic and manual control. In a case where the addition of the nutrient source for the microorganisms is performed completely automatically, a device having a function of automatically adding the nutrient source to the tank may be used. In addition, the nutrient source for the microorganisms may be automatically added at a frequency and timing set based on learned data learned from the usage tendency of the biological treatment system of the present disclosure. In the case where the addition of nutrient sources for microorganisms is performed by a combination of automatic and manual methods, the adjustment unit itself does not add nutrient sources, but notifies the operator that organic matter should be added.

[0030] (Control unit) The biological treatment system of the present disclosure includes a control unit that controls the adjustment unit based on the monitoring results of the microbial concentration index.

[0031] The control unit, for example, controls the adjustment unit to increase the microbial concentration when the value of the index of the microbial concentration monitored by the monitoring unit falls below the lower limit of the set range, and controls the adjustment unit to decrease the microbial concentration when the value of the index of the microbial concentration monitored by the monitoring unit exceeds the upper limit of the set range.

[0032] The control unit may be a device having a calculation function such as a computer, etc. Figure 2 is a conceptual diagram showing an example of the configuration of the control unit. The control unit 4 shown in Fig. 2 is composed of a CPU, a RAM, a ROM, and a non-volatile memory. In the control unit 4, the CPU reads out a program from the ROM, loads it into the RAM, and executes the process of the program. The program is provided to the control unit via a non-volatile memory such as a CD, a DVD, or a USB memory. Alternatively, the program may be provided to the control unit via a network.

[0033] The control unit 4 shown in FIG. 2 is connected to the sensors included in the monitoring unit 2, and to the nutrient source input device and ozone generator included in the adjustment unit 3. The control unit 4 shown in Fig. 2 is further connected to a temperature monitoring device that monitors the temperature of the mixture, and is also connected to pumps and blowers via a relay (a device that switches on / off). The temperature monitoring device is not particularly limited, and known means such as a thermometer, an infrared sensor, a radiation thermometer, a thermograph, a thermistor, etc. can be used. The temperature monitoring device may be of either a contact type or a non-contact type. The temperature monitoring device, pumps, and blowers may be controlled by a system different from the control unit 4.

[0034] The information input to the control unit may be only the value of the index of microbial concentration, or a combination of the value of the index of microbial concentration and other information. Other information to be combined with the value of the microbial concentration indicator may include information on the amount of the mixture, temperature, pH, outside air temperature, and the pattern in which the material to be treated is fed into the biological treatment system. As information on the pattern in which the subject of biological treatment is supplied to the biological treatment system, for example, if the supply amount of the subject of biological treatment changes regularly in a certain cycle, the pattern of this change may be input to the control unit. Examples of patterns of change include behavioral patterns of users of the biological treatment system, wastewater patterns according to the target users and user scale, and patterns of water quality changes.

[0035] The information input to the control unit may include information obtained by machine learning. For example, the output data obtained by inputting the microbial concentration index and other information as described above into the trained model may be input to the control unit. Examples of the output data obtained from the trained model include the rate of change of the microbial concentration and a predicted value of the microbial concentration after a predetermined time.

[0036] The control unit may have a function of improving the control accuracy while using data related to past control as learning data. That is, the control unit may have a function of generating a trained model (machine learning function). The machine learning function is achieved, for example, by a learning data storage unit, a learning unit, and a learned model storage unit. The learning unit reads out the learning data stored in the learning data storage unit. The learning unit then generates a trained model by training a predetermined machine learning model using a supervised machine learning algorithm based on the read out learning data. The trained model storage unit stores the trained model generated by the learning unit.

[0037] FIG. 3 shows an example of a process in which the control unit determines an instruction to the adjustment unit based on the monitoring result received from the monitoring unit. In the example shown in FIG. 3, first, the monitoring result R of the microbial concentration index received from the monitoring unit is input to the arithmetic processing unit of the control unit (step S1). Next, the control unit determines whether the monitoring result R is below the lower limit of the set range (step S2). If the monitoring result R is below the lower limit of the set range, the control unit determines a command to increase the microbial concentration (step S3). Next, the control unit determines whether the monitoring result R exceeds the upper limit of the set range (step S4). If the monitoring result R exceeds the upper limit of the set range, the control unit determines a command to reduce the microbial concentration (step S5). If the monitoring result R is not below the lower limit of the set range and is not above the upper limit, the control unit decides to maintain the microbial concentration. That is, the control unit may continue to monitor the microbial concentration together with the monitoring unit without issuing a command to the adjustment unit (step S6).

[0038] The setting range when the control unit makes the determination is not particularly limited and can be set arbitrarily. For example, when the indicator of the microbial concentration is the concentration of MLSS, it may be set within the range of 1000 mg / L to 3000 mg / L. The set range when the control unit makes the determination may be constant or may vary.

[0039] (aeration device) The biological treatment system of the present disclosure may include an aeration device that supplies air to the tank containing the mixture. By supplying air to the tank containing the mixture, the oxygen necessary for the activity and survival of microorganisms is ensured, and the decrease in activity and death of the microorganisms can be suppressed. The amount of air supplied by the air diffuser is not particularly limited and can be set according to the amount of biological targets and microorganisms contained in the mixture. The location of the air diffuser is not particularly limited as long as it can supply air to the tank containing the mixture. For example, the air diffuser may be installed at the bottom of the tank.

[0040] The air diffuser may provide a continuous or intermittent supply of air to a vessel containing the mixture. An example of a case in which the air diffuser intermittently supplies air to a tank containing a mixture is when the supply of air is switched on and off to alternate between periods of time that promote microbial activity (such as nitrification reactions) and periods of time that promote microbial activity such as denitrification reactions under anaerobic conditions. Alternatively, when the biological treatment system is used frequently, air may be supplied to promote microbial activity and proliferation, and when the biological treatment system is used infrequently, the air supply may be stopped to suppress microbial activity.

[0041] (Mixing device) The biological treatment system of the present disclosure may be provided with an agitation function for agitating the mixture. Agitating the mixture promotes contact between the target of biological treatment and the microorganisms, improving the efficiency of the biological treatment.

[0042] The structure of the stirring device is not particularly limited. For example, the stirring device may be one that stirs by rotating a stirrer or one that stirs by supplying air. The location where the stirring device is installed is not particularly limited as long as it is a location where the mixture outside the frame can be stirred. For example, the stirring device may be installed at the bottom of the tank.

[0043] (Filter) The biological treatment system may include a filter to filter the mixture. By providing the biological treatment system with a filter, for example, it is possible to separate the microorganisms in the mixture from the target matter after biological treatment when the mixture after biological treatment is removed from the biological treatment system.

[0044] The structure of the filter is not particularly limited, and may be, for example, a porous body or an assembly of hollow fibers.

[0045] (Other devices) If necessary, the biological treatment system may include devices other than those described above. For example, the biological treatment system may include devices for obtaining information other than an indicator of microbial concentration. Specific examples of information other than the indicator of microbial concentration include the ammonia concentration, nitrite concentration, nitrate concentration, dissolved oxygen concentration, organic matter concentration, pH, and temperature of the mixture. Information other than the indicator of microbial concentration may be transmitted to the control unit together with the monitoring result of the indicator of microbial concentration, or may be transmitted to a device other than the control unit.

[0046] <Biological treatment equipment> The biological treatment device of the present disclosure includes: A tank for accommodating a mixture of a material to be biologically treated and microorganisms; a monitoring unit for monitoring an indication of a microbial concentration of the mixture; A regulator for regulating the microbial concentration of the mixture; and a control unit that controls the adjustment unit based on the monitoring result of the indicator of the microbial concentration.

[0047] The details and preferred aspects of the biological treatment device of the present disclosure may be similar to the details and preferred aspects of the biological treatment system of the present disclosure. In other words, for details and preferred aspects of the biological treatment device of the present disclosure, reference can be made to the description of the biological treatment system above by replacing "biological treatment system" with "biological treatment device."

[0048] <Water purification system> The water purification system of the present disclosure includes the above-described biological treatment system or biological treatment device. The water purification system may be composed of only a biological treatment system or a biological treatment device, or may include a biological treatment system or a biological treatment device and a mechanism other than the biological treatment system. Specific examples of mechanisms other than biological treatment systems or biological treatment devices include tanks for separating solid and liquid components contained in the target of biological treatment, tanks for separating the microorganisms contained in the target after biological treatment from the target after biological treatment, and tanks for storing the target after biological treatment.

[0049] A tank for separating solid and liquid components contained in a material to be biologically treated maintains good efficiency of the biological treatment in the biological treatment system, for example, by adjusting the concentration of organic matter contained in the material to be supplied to the biological treatment system. Methods for separating solid and liquid components contained in the material include a method of precipitating the solid components and a method of passing the solid components through a filter. The biological treatment system or biological treatment device may have a function of separating solid components and liquid components contained in the subject of biological treatment.

[0050] The tank for separating the microorganisms contained in the biologically treated target from the biologically treated target, for example, prevents the microorganisms from flowing out of the water purification system together with the biologically treated target. Methods for separating the microorganisms contained in the target from the biologically treated target include a method of precipitating the microorganisms and a method of passing the microorganisms through a filter. The biological treatment system or biological treatment device may have a function of separating the treated object from microorganisms contained in the treated object after biological treatment.

[0051] The tank for storing the biologically treated object adjusts the timing for releasing the biologically treated object, for example. The biological treatment system may have a function of storing the target material after biological treatment.

[0052] The water purification system may include a mechanism for decolorizing the target material after biological treatment. Mechanisms for decolorizing the target material after biological treatment include ozone generators, activated carbon, etc. The mechanism for decolorizing the biologically treated object may be provided, for example, in a tank for storing the biologically treated object.

[0053] The water purification system may include a mechanism for disinfecting the target after biological treatment. For example, the system may include a mechanism for adding chemicals such as chlorine to the target after biological treatment, a mechanism for treating the target with ozone, etc. The mechanism for disinfecting the object after biological treatment may be provided, for example, in a tank for storing the object after biological treatment.

[0054] The water purification system may include a mechanism for adding microorganisms or a nutrient source for microorganisms to the subject of biological treatment.

[0055] The water purification system may include a mechanism for purifying the target matter after biological treatment. By purifying the target material after biological treatment, the impurity content of the target material after biological treatment can be reduced to a desired standard. The type of mechanism for purifying the target material after biological treatment is not particularly limited, and can be selected according to the use of the target material after biological treatment, the required purity, etc. Specific examples include reverse osmosis membranes (RO membranes), ultrafiltration membranes (UF membranes), microfiltration membranes (MF membranes), activated carbon, etc. The water purification system may include a tank for storing the material purified by the mechanism.

[0056] Water purification systems are available as either circulating or non-circulating. In the present disclosure, a water purification system being of a circulating type means that all or a part of the target material to be biologically treated is returned to the source of the target material to be biologically treated. A specific example of a circulating water purification system is a system that biologically treats wastewater from household facilities such as kitchens, bathrooms, and toilets, and then reuses the treated wastewater as flush water for flushing toilets (circulating flush toilets).

[0057] <Biological treatment method> The biological treatment method of the present disclosure includes: A step of monitoring an indicator of a microbial concentration of a mixture contained in a tank containing a mixture of a target material for biological treatment and microorganisms; adjusting the microbial concentration of the mixture; This is a biological treatment method in which the adjustment of the microbial concentration is controlled based on the monitoring results of an indicator of the microbial concentration.

[0058] According to the biological treatment method of the present disclosure, the microbial concentration in a tank that contains a mixture of a biological treatment target and microorganisms can be controlled with a desired degree of accuracy, and therefore efficient and stable biological treatment can be carried out even when there are large fluctuations in the supply amount and supply timing of the biological treatment target.

[0059] The method of carrying out the biological treatment method of the present disclosure is not particularly limited. For example, the method may be carried out using the biological treatment system or biological treatment device of the present disclosure. In this case, the details and preferred aspects of carrying out the biological treatment method are the same as the details and preferred aspects of carrying out the biological treatment system of the present disclosure.

[0060] <Water purification method> The water purification method of the present disclosure is a water purification method including a step of carrying out the above-described biological treatment method of the present disclosure.

[0061] The water purification method may include a step of separating solid and liquid components contained in the target of biological treatment. Examples of methods for separating solid and liquid components contained in the target include a method of precipitating solid components and a method of passing the solid components through a filter.

[0062] The water purification method may include a step of separating the microorganisms contained in the target material after biological treatment from the target material after biological treatment. Methods for separating the microorganisms contained in the target material from the target material after biological treatment include a method of precipitating the microorganisms and a method of passing the microorganisms through a filter.

[0063] The water purification method may include a step of storing the target material after biological treatment.

[0064] The water purification method may include a step of decolorizing the biologically treated object. Examples of the method for decolorizing the biologically treated object include a method of supplying ozone to the biologically treated object, and a method of contacting the biologically treated object with activated carbon.

[0065] The water purification method may include a step of disinfecting the target object after the biological treatment. For example, the method may include a step of adding a chemical such as chlorine to the target object after the biological treatment, a step of supplying ozone, or the like.

[0066] The water purification method may include a mechanism for adding microorganisms or a nutrient source for microorganisms to the subject of biological treatment.

[0067] Water purification methods can be utilized both in a circulating and non-circulating manner. Specific examples of circulating water purification methods include biological treatment of wastewater from household facilities such as kitchens, bathrooms, and toilets, and then reusing the treated wastewater as flush water for flushing toilets. [Explanation of symbols]

[0068] 1: Tank 2: Monitoring department 3a, 3b: Adjustment section 4: Control unit 5a, 5b: Drive unit 11, 12a, 12b: Signal transmission means

Claims

1. A tank for accommodating a mixture of a material to be biologically treated and microorganisms; a monitoring unit for monitoring an indication of a microbial concentration of the mixture; A regulator for regulating the microbial concentration of the mixture; A control unit that controls the adjustment unit based on a monitoring result of the index of the microbial concentration, The indicator of microbial concentration includes OUR, Daily processing capacity is 1,000m ３ is as follows: The adjustment unit has a function of supplying a nutrient source for microorganisms to the mixture and a function of supplying ozone to the mixture. A circulating biological treatment system.

2. A tank for accommodating a mixture of a material to be biologically treated and microorganisms; a monitoring unit for monitoring an indication of a microbial concentration of the mixture; A regulator for regulating the microbial concentration of the mixture; A control unit that controls the adjustment unit based on a monitoring result of the index of the microbial concentration, The indicator of microbial concentration includes OUR, Daily processing capacity is 1,000m ３ is as follows: The adjustment unit has a function of supplying a nutrient source for microorganisms to the mixture and a function of supplying ozone to the mixture. A circulating biological treatment device.

3. A water purification system comprising the biological treatment system according to claim 1 or the biological treatment device according to claim 2.

4. A step of monitoring an indicator of a microbial concentration of a mixture contained in a tank containing a mixture of a target material for biological treatment and microorganisms; adjusting the microbial concentration of the mixture; The adjustment of the microbial concentration is controlled based on the monitoring result of the indicator of the microbial concentration; The indicator of microbial concentration includes OUR, Daily processing capacity is 1,000m ３ is as follows: Regulating the concentration of the microorganisms includes providing a nutrient source for the microorganisms to the mixture and providing ozone to the mixture. A circulating biological treatment method.

5. A water purification method comprising a step of carrying out the biological treatment method according to claim 4.

6. A tank for accommodating a mixture of a material to be biologically treated and microorganisms; a monitoring unit for monitoring an indication of a microbial concentration of the mixture; A regulator for regulating the microbial concentration of the mixture; A control unit that controls the adjustment unit based on a monitoring result of the index of the microbial concentration, The indicator of microbial concentration includes OUR, Daily processing capacity is 1,000m ３ is as follows: A biological treatment system, wherein the adjustment unit has a function of supplying a nutrient source for microorganisms to the mixture and a function of supplying ozone to the mixture, and the nutrient source includes at least one of alcohols or sugars.

7. A tank for accommodating a mixture of a material to be biologically treated and microorganisms; a monitoring unit for monitoring an indication of a microbial concentration of the mixture; A regulator for regulating the microbial concentration of the mixture; A control unit that controls the adjustment unit based on a monitoring result of the index of the microbial concentration, The indicator of microbial concentration includes OUR, Daily processing capacity is 1,000m ３ is as follows: The adjustment unit has a function of supplying a nutrient source for microorganisms to the mixture and a function of supplying ozone to the mixture, and the nutrient source includes at least one of alcohols and sugars.

8. A step of monitoring an indicator of a microbial concentration of a mixture contained in a tank containing a mixture of a subject of biological treatment and microorganisms; adjusting the microbial concentration of the mixture; The adjustment of the microbial concentration is controlled based on the monitoring result of the indicator of the microbial concentration; The indicator of microbial concentration includes OUR, Daily processing capacity is 1,000m ３ is as follows: The biological treatment method, wherein the adjustment includes supplying a nutrient source for microorganisms to the mixture and supplying ozone to the mixture, the nutrient source including at least one of alcohols or sugars.

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