Water treatment apparatus, method, program, and system

Abstract

To provide a single tank-type nitrification-denitrification treatment capable of efficient nitrification-denitrification under an environment where the water quality of supplied target water changes.SOLUTION: A water treatment apparatus of this embodiment includes a wastewater control tank for reserving wastewater, first measurement means for measuring the water quality of wastewater flowing into the wastewater control tank, a biological treatment tank capable of switching processing on wastewater supplied from the wastewater control tank by switching ON / OFF of aeration, and control means for controlling aeration time in treatment based on a measurement result of the first measurement means.SELECTED DRAWING: Figure 4

Description

Technical Field

[0001] The present disclosure relates to a water treatment apparatus, method, program, and system.

Background Art

[0002] Patent Document 1 describes a method for treating nitrogen-containing wastewater by an intermittent aeration method capable of efficiently removing nitrogen from nitrogen-containing wastewater such as secondary treated sewage water, leachate from landfill sites, rivers, manure, and industrial wastewater.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In Patent Document 1, the pH change in the reaction tank where intermittent aeration treatment is performed is continuously measured with a pH meter, the end of the nitrification reaction is detected from the inflection point, and the nitrification time, which is the time from the start of nitrification until the inflection point appears, is calculated. From this nitrification time and the previously determined nitrification rate, the raw water nitrogen concentration is estimated. The raw water flow rate is controlled to keep the nitrogen load in the reaction tank constant based on this raw water nitrogen concentration.

[0005] However, Patent Document 1 assumes efficient nitrogen removal from nitrogen-containing wastewater such as secondary treated sewage water, leachate from landfill sites, rivers, manure, and industrial wastewater. That is, Patent Document 1 assumes efficient nitrogen removal from sludge that has been homogenized to some extent, and does not assume operation in an environment where the quality of the water to be treated fluctuates.

[0006] An object of the present disclosure is to provide a single-tank nitrification and denitrification treatment capable of efficiently performing nitrification and denitrification in an environment where the quality of the water to be treated supplied fluctuates.

Means for Solving the Problem

[0007] The water treatment apparatus of the present embodiment includes a drainage adjustment tank for storing drainage, a first measurement means for measuring the water quality of the drainage flowing into the drainage adjustment tank, a biological treatment tank capable of switching the treatment for the drainage supplied from the drainage adjustment tank by switching on / off of aeration, and a control means for controlling the aeration time in the treatment based on the measurement result of the first measurement means.

Effect of the Invention

[0008] According to the present disclosure, it is possible to provide a single-tank nitrification and denitrification treatment capable of efficiently performing nitrification and denitrification in an environment where the water quality of the supplied water to be treated fluctuates.

Brief Description of the Drawings

[0009]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Best Mode for Carrying Out the Invention

[0010] (First Embodiment) Hereinafter, the first embodiment will be described in detail with reference to the drawings. In the drawings for explaining the embodiments, the same components are generally denoted by the same reference numerals, and the repeated description thereof will be omitted.

[0011] <1. Outline> The water treatment apparatus according to the present embodiment is, for example, an apparatus for circulating and regenerating wastewater (hereinafter simply referred to as wastewater) discharged from a consumer. The regenerated water can be used as domestic water for, for example, toilet flushing, bathing, showering, washing, dishwashing, etc. Further, the regenerated water may be used as drinking water. That is, the water treatment apparatus is a small-sized circulation type water treatment apparatus.

[0012] The water treatment apparatus includes, for example, a treatment tank module in which a wastewater adjustment tank, a biological treatment tank, and a treated water storage tank for treating and purifying wastewater (domestic wastewater, sewage, etc.) discharged from a consumer are compactly integrated. In the biological treatment tank, a one-tank type nitrification and denitrification treatment in which nitrification treatment and denitrification treatment are switched at a predetermined time ratio is carried out. The water treatment apparatus monitors the input of urine into the wastewater adjustment tank, and sets the time of nitrification treatment and denitrification treatment according to the monitoring result. Further, the water treatment apparatus adjusts the amount of the hydrogen donor added when switching from nitrification treatment to denitrification treatment according to the monitoring result.

[0013] <2. Overall Configuration> The overall configuration of the water treatment apparatus 1 according to the present embodiment will be described. FIG. 1 is an overall configuration diagram of an example of the water treatment apparatus 1. FIG. 1 shows an example in which the water treatment apparatus 1 is used in a circulation type toilet 100.

[0014] The circulating toilet 100 according to this embodiment is used, for example, as a toilet for a residence, a villa, a mountain hut, a temporary housing, or a mobile home built in an area where water supply and sewerage facilities are not well - developed, such as a mountainous area. Also, the circulating toilet 100 is used, for example, as a toilet temporarily installed at an outdoor event venue, a construction site, or an evacuation shelter during a disaster. By using the circulating toilet 100, it becomes possible to treat the wastewater and reuse it as recycled water, so that the toilet can be used even without well - equipped water supply and sewerage facilities.

[0015] Note that the water treatment device 1 according to this embodiment can be used other than in the circulating toilet 100. The water treatment device 1 may be used, for example, for the regeneration of wastewater used in a kitchen, a washing area (for laundry), a bathroom, etc. At this time, for example, in the water treatment device 1, a filtration unit, a UV sterilization unit, etc. may be installed between the final - stage water tank and the actual use of water by the consumer. The filtration unit is realized, for example, by physical filtration such as reverse osmosis membranes, nanofiltration membranes, ultrafiltration membranes, microfiltration membranes, etc., as well as chemical filtration such as biological filtration, activated carbon, zeolite, ion - exchange resins, etc. The UV sterilization unit sterilizes the water. Also, in the water treatment device 1, the toilet wastewater and the wastewater used in the kitchen, the washing area (for laundry), the bathroom, etc. may be treated in different treatment systems.

[0016] As shown in FIG. 1, the water treatment device 1 is connected to the toilet bowl 2 of the toilet by a plurality of drain pipes. The water treatment device 1 includes a drainage adjustment tank 10, a biological treatment tank 20, a treated water storage tank 30, and an ozone generator 40. The drainage adjustment tank 10, the biological treatment tank 20, and the treated water storage tank 30 are connected by a plurality of drain pipes so that water can be sent between predetermined tanks. A pump is provided in each of the plurality of drain pipes, and the driving of each pump is controlled so that the water level in the tank to which the pump sends water is within a predetermined range and, as much as possible, a quantitative continuous operation is achieved. Note that FIG. 1 is merely an example, and the water treatment device 1 may have other configurations. For example, the drainage adjustment tank 10, the biological treatment tank 20, and the treated water storage tank 30 may be included in one module that performs a series of processes. Also, at least some of the pumps in the water treatment device 1 are not essential, and liquid may be sent using other physical phenomena such as gravity, overflow, and the principle of siphon.

[0017] The water treatment device 1 includes a control unit 50. The control unit 50 controls, for example, the components included in the water treatment device 1. Also, the water treatment device 1 includes, for example, a sensor unit for detecting various physical properties in the drainage adjustment tank 10, the biological treatment tank 20, the treated water storage tank 30, or pipes connected thereto.

[0018] <3. Drainage Adjustment Tank 10> The drainage adjustment tank 10 is disposed downstream of the toilet bowl 2 and temporarily stores the drainage discharged from the toilet bowl 2. For example, a pulverizing and pumping pump may be installed in the toilet bowl 2. The pulverizing and pumping pump pulverizes the dirt and the like contained in the drainage and sends the pulverized dirt together with the drainage to the drainage adjustment tank 10.

[0019] A blower 11 is provided in the drainage adjustment tank 10. The blower 11 continuously or intermittently sends air into the drainage adjustment tank 10. The air sent from the blower 11 stirs the drainage stored inside the drainage adjustment tank 10. A pump 66 is installed between the drainage adjustment tank 10 and the biological treatment tank 20. The pump 66 sends the drainage stored in the drainage adjustment tank 10 to the biological treatment tank 20.

[0020] Inside the drainage adjustment tank 10 or in the vicinity of the drainage adjustment tank 10, a measuring instrument 12 for measuring the quality of the drainage flowing into the drainage adjustment tank 10 is installed. Specifically, for example, the measuring instrument 12 is installed in the flow path in front of the drainage adjustment tank 10, the inlet of the drainage adjustment tank 10, the void portion inside the drainage adjustment tank 10, or the drainage in the drainage adjustment tank 10. The measuring instrument 12 measures, for example, the electrical conductivity of the drainage. The measuring instrument 12 transmits the EC value as the measurement result to the control unit 50.

[0021] <4. Biological treatment tank 20> An example of the configuration of the biological treatment tank 20 will be described. The biological treatment tank 20 decomposes the organic compounds contained in the drainage discharged from the drainage adjustment tank 10 by using microorganisms. In addition, in the biological treatment tank 20, biological denitrification for removing nitrogen compounds by the action of microorganisms is performed. In biological denitrification, aerobic bacteria and facultative anaerobic bacteria are combined to decompose nitrogen compounds and carbon compounds in the drainage. Biological denitrification includes a nitrification process performed under aerobic conditions and a denitrification process performed under anoxic conditions.

[0022] In the nitrification process, nitrifying bacteria oxidize the nitrogen component in the drainage to nitrous acid or nitric acid. Nitrifying bacteria are a type of aerobic bacteria that require the presence of sufficient dissolved oxygen in the tank.

[0023] In the denitrification process, the water nitrified in the nitrification process is placed under anaerobic conditions without dissolved oxygen, and nitrous acid and nitric acid are reduced to nitrogen gas by using anaerobic respiration by denitrifying bacteria.

[0024] The biological treatment tank 20 is formed of, for example, a single tank, and the nitrification process and the denitrification process are carried out in the single tank. A stirrer 23, a membrane filtration unit 25, a blower 26, and a blower 27 are installed in the biological treatment tank 20. The stirrer 23 is realized by, for example, a mixer having stirring blades. The stirrer 23 rotates the stirring blades at a timing based on the control of the control unit 50, for example, to stir the mixed liquid and promote the contact between the microorganisms and organic substances contained in the mixed liquid. Thereby, the stirrer 23 is driven in the denitrification process.

[0025] The membrane filtration unit 25 is realized by, for example, at least any one of MF (microfiltration membrane), UF (ultrafiltration membrane), NF (nanofiltration membrane), ceramic filter, and metal membrane. The membrane filtration unit 25 filters the biologically treated water to obtain treated water. A pump 67 is installed between the biological treatment tank 20 and the treated water storage tank 30. The pump 67 sends the treated water filtered by the membrane filtration unit 25 to the treated water storage tank 30.

[0026] The blower 26 supplies air (or oxygen) into the biological treatment tank 20, for example, at a timing based on the control of the control unit 50. The aerobic circulation in the nitrification process is maintained by the air supplied from the blower 26.

[0027] The blower 27 is installed, for example, below the membrane filtration unit 25. The blower 27 supplies air (or oxygen) to the membrane filtration unit 25, for example, at a timing based on the control of the control unit 50. The membrane filtration unit 25 is cleaned by the air supplied from the blower 27.

[0028] A supply unit 80 is installed in the biological treatment tank 20. The supply unit 80 supplies a hydrogen donor to the biological treatment tank 20, for example, at a timing based on the control of the control unit 50. The hydrogen donor is a substance that gives hydrogen to other substances in the biological treatment tank 20 to reduce them, and is dehydrogenated and oxidized itself. The hydrogen donor may be, for example, an alcohol such as methanol and ethanol, or a saccharide such as glucose.

[0029] The biological treatment tank 20, the stirrer 23, the membrane filtration unit 25, the blower 26, the blower 27, and the supply unit 80 may be referred to as forming the biological treatment module 3.

[0030] <5. Control Unit 50> The control unit 50 controls the operation of the entire water treatment apparatus 1. Specifically, for example, the control unit 50 controls biological denitrification in the biological treatment tank 20. For example, the control unit 50 sets the cycles of the nitrification process and the denitrification process based on the EC value of the wastewater flowing into the wastewater adjustment tank 10. Hereinafter, the cycle of the nitrification process is referred to as the aeration cycle, and the cycle of the denitrification process is referred to as the anoxic cycle.

[0031] More specifically, for example, when starting up the water treatment apparatus 1, the control unit 50 determines whether the EC value measured by the measuring instrument 12 is equal to or greater than a predetermined threshold value, for example, 1000 μS / cm. When the control unit 50 is equal to or greater than the threshold value, it is considered that the water use includes night soil drainage. The control unit 50 counts the number of times an EC value equal to or greater than the threshold value is measured during a series of steps related to biological denitrification performed in the biological treatment tank 20. In the present embodiment, a series of steps related to biological denitrification includes, for example, an input step, a nitrification step, a denitrification step, and a withdrawal step. The input step is a step of inputting wastewater into the biological treatment tank 20. The withdrawal step is a step of withdrawing the treated water biologically treated from the biological treatment tank 20.

[0032] Also, for example, after the water treatment apparatus 1 reaches a steady operation state, the control unit 50 may determine whether the difference between the EC value measured by the measuring instrument 12 and the EC value measured for the treated water withdrawn from the biological treatment tank 20 is equal to or greater than a predetermined threshold value, for example, 1000 μS / cm. When the control unit 50 is equal to or greater than the threshold value, it is considered that the water use includes night soil drainage. When the purification of water by circulation is repeated, the EC value of the reclaimed water changes to a high value. Therefore, by taking the difference between the EC value of the wastewater input into the wastewater adjustment tank 10 and the EC value of the reclaimed water, it becomes possible to detect with high accuracy that night soil drainage has been input. The control unit 50 counts the number of times a difference value equal to or greater than the threshold value is measured during a series of steps related to biological denitrification performed in the biological treatment tank 20.

[0033] Note that the treated water drawn from the biological treatment tank 20 can be paraphrased as, for example, the treated water after treatment in the biological treatment tank 20, and can be the water in the path from the biological treatment tank 20 to the toilet 2 after passing through the membrane filtration unit 25 of the biological treatment tank 20. If possible, it is desirable that the water be the water in the path from the treated water storage tank 30 to the toilet 2. The EC value of the treated water drawn from the biological treatment tank 20 is measured by a measuring instrument 28 installed, for example, in the flow path from the biological treatment tank 20 to the treated water storage tank 30, inside the treated water storage tank 30, the flow path from the treated water storage tank 30 to the toilet 2, and the like.

[0034] Based on the count value counted during the previous series of steps, the control unit 50 sets the aeration cycle and the anoxic cycle in the next series of steps. For example, based on the count value, the control unit 50 sets values so that the aeration cycle and the anoxic cycle maintain a predetermined ratio. Specifically, for example, based on the count value, the control unit 50 sets values so that the aeration cycle and the anoxic cycle maintain a ratio of 3:1. The predetermined ratio is, for example, a ratio that has been determined through prior experiments to enable stable biological denitrification operation. For example, if the aeration cycle:anoxic cycle = 3:1, it is known that stable biological denitrification can be achieved. Also, depending on the environment, it can vary, such as aeration cycle:anoxic cycle = 1:3. The optimal ratio according to the environment is set, and the treatment in this embodiment is carried out.

[0035] That is, when the count value is greater than or equal to the first count value, the control unit 50 sets the aeration cycle to 3 hours and the anoxic cycle to 1 hour. Also, when the count value is greater than or equal to the second count value and less than the first count value, the control unit 50 sets the aeration cycle to 1 hour and the anoxic cycle to 20 minutes. Further, when the count value is greater than or equal to the third count value and less than the second count value, the control unit 50 sets the aeration cycle to 30 minutes and the anoxic cycle to 10 minutes. Note that the values of the aeration cycle and the anoxic cycle are just examples, and they may be longer than (3 hours, 1 hour) or shorter than (30 minutes, 10 minutes). In addition to the count value, the control unit 50 may also consider the flow rate of the wastewater supplied from the wastewater adjustment tank 10 to the biological treatment tank 20 measured by the flow meter, and determine the lengths of the aeration cycle and the anoxic cycle so as to maintain an optimal ratio according to the environment.

[0036] Also, when the count value counted during the previous series of steps is 0, the control unit 50 sets the aeration cycle to 0 minutes and the anoxic cycle to 0 minutes. As a result, the series of steps will not include the aeration cycle and the anoxic cycle, but only the charging step and the drawing step. Consequently, there is no need for unnecessary aeration, and power can be saved. In addition, the consumption due to the addition of the hydrogen donor can be suppressed, and the time cycle required for the series of wastewater treatment steps can be shortened.

[0037] In the above description, the control unit 50 sets the aeration cycle and the anoxic cycle in the next series of steps based on the count value counted during the previous series of steps. However, the control unit 50 may set the aeration cycle in the next series of steps based on the count value counted during the previous series of steps, and then set the anoxic cycle based on the set aeration cycle.

[0038] Based on the count value counted during the previous series of steps, the control unit 50 sets the amount of hydrogen donor to be input from the supply unit 80 in the next series of steps. Note that the control unit 50 may determine the amount of hydrogen donor in consideration of, in addition to the count value, the drainage volume of the drainage water supplied from the drainage adjustment tank 10 to the biological treatment tank 20 measured by the flow meter. For example, the control unit 50 determines the amount of hydrogen donor by multiplying the ratio of the measured drainage volume to the predetermined drainage volume. The drainage volume of the drainage water supplied from the drainage adjustment tank 10 to the biological treatment tank 20 may be calculated based on the volume of the treated water withdrawn from the biological treatment tank 20.

[0039] Based on the set aeration cycle and anoxic cycle, the control unit 50 controls, for example, the pump 66, pump 67, agitator 23, blower 26, blower 27, and supply unit 80. Also, the control unit 50 controls the supply unit 80 based on the set amount of hydrogen donor.

[0040] Specifically, for example, in a series of steps, the control unit 50 controls the pump 66 to supply drainage water from the drainage adjustment tank 10 to the biological treatment tank 20. The control unit 50 drives the blower 26 to start aeration in the biological treatment tank 20 along with the input of the drainage water. When the control unit 50 inputs a predetermined amount of drainage water, it stops the pump 66. When the control unit 50 stops the input of the drainage water, it starts the aeration cycle. When a predetermined time has elapsed and the aeration cycle ends, the control unit 50 stops the blower 26. When the control unit 50 stops the blower 26, it simultaneously controls the supply unit 80 to supply the set amount of hydrogen donor to the biological treatment tank 20. When the control unit 50 stops the blower 26, it simultaneously drives the agitator 23. When the control unit 50 stops the blower 26, it starts the anoxic cycle. When a predetermined time has elapsed and the anoxic cycle ends, and the blower 27 is driven and the pump 67 is driven at the same time, the treated water is withdrawn from the biological treatment tank 20 while the treated water is filtered by the membrane filtration unit 25.

[0041] By supplying a hydrogen donor at the timing of starting the anaerobic cycle, for example, an anaerobic atmosphere without dissolved oxygen and a hydrogen donor necessary for reducing the oxygen molecules of nitrous acid and nitric acid will exist. Therefore, in the denitrification process, the reduction reaction of the oxygen molecules of nitrous acid and nitric acid is effectively promoted.

[0042] <6. Treated Water Storage Tank 30> The treated water storage tank 30 is a tank that stores the treated water obtained by biologically treating the wastewater. That is, the treated water storage tank 30 stores the treated water to be supplied to the toilet 2. In other words, the treated water storage tank 30 stores the treated water obtained by treating the wastewater in the biological treatment tank 20. A pipe 41 connected to the toilet 2 is connected to the treated water storage tank 30.

[0043] The pump 63 provided in the pipe 41 supplies the treated water for cleaning the toilet 2 to the toilet 2 through the pipe 41. The pump 63 is driven, for example, when the toilet 2 is used. The drive of the pump 63 may also be in response to an instruction from the user or in response to the detection of the use of the toilet 2. Further, when it is assumed that the circulation toilet 100 will not be used for a long period of time, the pump 63 may be driven at predetermined intervals.

[0044] The treated water storage tank 30 is supplied with, for example, ozone gas generated by the ozone generator 40. The ozone generator 40 supplies ozone gas into the treated water in the treated water storage tank 30, that is, into the liquid phase of the treated water storage tank 30. Note that the ozone generator 40 may supply ozone gas into the gas phase of the treated water storage tank 30.

[0045] The ozone gas generation method by the ozone generator 40 includes, for example, the discharge method (silent discharge method), the electrolysis method (water electrolysis cell method), the ultraviolet method (mercury UV lamp method, mercury-free UV lamp (excimer lamp) method), etc. The ultraviolet method (mercury-free UV lamp (excimer lamp) method) can generate ozone gas with few impurities without generating harmful nitrogen oxides from nitrogen present in the atmosphere during ozone gas generation. By generating ozone gas with few impurities, the operating time of the ozone generator 40 can be reduced, power consumption can be suppressed, and the ozone generator 40 can be made to have a longer lifespan. By generating ozone gas with few impurities, it is possible to miniaturize the water circulation system equipment and reduce the locations of deterioration and damage, which also leads to a reduction in the maintenance frequency.

[0046] In the treated water storage tank 30, the ozone gas decolorizes, sterilizes, and deodorizes the treated water (hereinafter referred to as ozone treatment) with its strong oxidizing power. Among the ozone gas supplied to the treated water, the surplus ozone gas (gas in the tank) that is not used for ozone treatment in the treated water fills the space formed at the upper part of the treated water storage tank 30 and is then supplied to the drainage adjustment tank 10 or / and the biological treatment tank 20 and can be reused. Thereby, for example, deodorization of the drainage adjustment tank 10, the biological treatment tank 20, and the treated water storage tank 30, sterilization of the water in the drainage adjustment tank 10, the biological treatment tank 20, and the treated water storage tank 30, decolorization of the water in the drainage adjustment tank 10, the biological treatment tank 20, and the treated water storage tank 30, etc. become possible.

[0047] In this embodiment, the concentration of the ozone gas supplied to the treated water storage tank 30 can be made lower than, for example, the concentration of the ozone gas supplied to the decolorization tank provided in existing water purification facilities. In existing water purification facilities, since the time for water to be stored in the decolorization tank (ozone treatment tank) is short, it is necessary to bring the ozone gas and water into contact in a short time. On the other hand, in this embodiment, since the treated water is stored in the treated water storage tank 30 for a long time, the ozone gas and the treated water will be in contact for a long time. Due to such a difference in storage time, the concentration of the ozone gas supplied to the treated water storage tank 30 may be lower than the concentration of the ozone gas supplied to the decolorization tank provided in existing water purification facilities.

[0048] <7. Operation of biological treatment tank 20> The operation during biological denitrification in the biological treatment tank 20 will be described in detail below.

[0049] (Setting of parameters related to biological denitrification) FIG. 2 is a flowchart showing an example of the operation of the control unit 50 when setting parameters related to biological denitrification. The control unit 50 performs the processes shown in FIG. 2, for example, during a series of steps related to biological denitrification.

[0050] In step S11, the control unit 50 acquires the EC value measured by the measuring instrument 12. Specifically, for example, the measuring instrument 12 measures the EC value of the wastewater supplied to the installed position at a predetermined cycle. The measuring instrument 12 transmits the measured EC value to the control unit 50.

[0051] In step S12, the control unit 50 measures a predetermined count value based on the EC value measured by the measuring instrument 12. Specifically, for example, after starting up the water treatment apparatus 1, until a predetermined period elapses or until a predetermined number of steps are performed, the control unit 50 counts the number of times the EC value measured by the measuring instrument 12 becomes equal to or greater than a predetermined threshold value, for example, 1000 μS / cm.

[0052] Also, for example, after a predetermined period has elapsed after starting up the water treatment apparatus 1 or after a predetermined number of steps have been performed, that is, after the water treatment apparatus 1 has entered a steady operation state, the control unit 50 counts the number of times the difference between the EC value measured by the measuring instrument 12 and the EC value measured for the treated water drawn from the biological treatment tank 20 becomes equal to or greater than a predetermined threshold value, for example, 1000 μS / cm. Note that it is not limited to the requirement that a predetermined period elapses or a predetermined number of steps are performed after starting up the water treatment apparatus 1, and for example, it may be a requirement that the EC value reaches a predetermined value.

[0053] In step S13, the control unit 50 determines whether a series of processes related to biological denitrification have ended. Specifically, for example, the control unit 50 determines whether the input process, nitrification process, denitrification process, and extraction process have ended. If not, the control unit 50 causes the process to shift to step S11 and repeats the operations of steps S11 to S13 until the series of processes ends. If it has ended, the control unit 50 causes the process to shift to step S14.

[0054] In step S14, the control unit 50 sets parameters related to biological denitrification based on the count value. Specifically, for example, the control unit 50 sets the aeration cycle and the anoxic cycle in the next series of processes based on the count value. Specifically, for example, when the count value is 0, the control unit 50 sets the aeration cycle to 0 minutes and the anoxic cycle to 0 minutes. When the count value is 1 or more, the control unit 50 sets values so that the aeration cycle and the anoxic cycle maintain a predetermined ratio, for example, 3:1, based on the count value.

[0055] Also, the control unit 50 sets the amount of hydrogen donor input from the supply unit 80 in the next series of processes based on the count value, for example. Specifically, for example, the control unit 50 sets the amount of hydrogen donor in the next series of processes to count value × n (ml) based on the count value.

[0056] (Control related to biological denitrification) FIG. 3 is a flowchart showing an example of the operation of the control unit 50 when executing control related to biological denitrification. The process shown in FIG. 3 represents, for example, the process of the control unit 50 in a series of processes related to biological denitrification.

[0057] FIG. 4 is a schematic diagram showing an example of a process related to biological denitrification. FIG. 5 is a schematic diagram showing another example of a process related to biological denitrification. In the examples shown in FIGS. 4 and 5, the timing of measurement of the treatment in the biological treatment tank 20 and the EC value is shown. In the example shown in FIG. 4, the aeration cycle is 3 hours and the anoxic cycle is 1 hour. In the example shown in FIG. 5, the aeration cycle and the anoxic cycle are 0 minutes.

[0058] In step S21, the control unit 50 starts the input of drainage and aeration into the biological treatment tank 20. Specifically, for example, the control unit 50 controls the pump 66 to supply the drainage from the drainage adjustment tank 10 to the biological treatment tank 20. The control unit 50 drives the blower 26 together with the input of the drainage to start the aeration in the biological treatment tank 20.

[0059] In step S22, when the control unit 50 inputs a predetermined amount of drainage, it stops the pump 66 and starts the aeration cycle. Specifically, the control unit 50 stops the pump 66 when a predetermined requirement is satisfied. The predetermined requirements include, for example, the following. · The water storage volume of the drainage adjustment tank 10 has reached the predetermined capacity · A predetermined amount of drainage has been supplied to the biological treatment tank 20 · The water storage volume of the biological treatment tank 20 has reached the predetermined capacity

[0060] When the control unit 50 stops the input of the drainage, it starts counting the aeration cycle set in the previous series of steps.

[0061] In step S23, when the aeration cycle ends, the control unit 50 stops the blower 26 and controls the supply unit 80. Specifically, for example, when 3 hours have elapsed since the start of the aeration cycle, the control unit 50 stops the blower 26. When the control unit 50 stops the blower 26, it simultaneously controls the supply unit 80 to add the amount of hydrogen donor set in the previous series of steps to the biological treatment tank 20.

[0062] When the aeration cycle ends, the control unit 50 starts an anoxic cycle and drives the agitator 23. Specifically, for example, when the aeration cycle ends, the control unit 50 starts counting the anoxic cycle set in the previous series of steps.

[0063] In step S24, when the anoxic cycle ends, the control unit 50 draws out the treated water from the biological treatment tank 20. Specifically, for example, when one hour has elapsed since the start of the anoxic cycle, the control unit 50 drives the pump 67 and draws out the treated water from the biological treatment tank 20 while filtering the treated water by the membrane filtration unit 25. When the control unit 50 drives the pump 67, it simultaneously drives the blower 27 to clean the membrane filtration unit 25.

[0064] FIG. 6 is a diagram showing the transitions of ORP (Oxidation-Reduction Potential), DO (Dissolved Oxygen), and pH when the aeration cycle is 3 hours and the anoxic cycle is 1 hour. In the example shown in FIG. 6, as shown in FIGS. 4 and 5, it represents the transitions of each value when the wastewater is continuously input, rather than when the wastewater is discontinuously input. In FIG. 6, the horizontal axis represents time (h), and the vertical axis represents ORP, DO, and pH. The measuring instruments for measuring ORP, DO, and pH are installed, for example, in the biological treatment tank 20. According to FIG. 6, it can be seen that even when the wastewater containing excrement is continuously input, stable biological denitrification can be expected in the biological treatment tank 20 by setting the aeration cycle to 3 hours and the anoxic cycle to 1 hour.

[0065] FIG. 7 is a diagram showing the changes in NPOC (Non-Purgeable Organic Carbon) and T-N (Total Nitrogen) when the aeration cycle is 3 hours and the anoxic cycle is 1 hour. In the example shown in FIG. 7, as shown in FIGS. 4 and 5, it represents the changes in each value when the wastewater is continuously input, rather than when the wastewater is discontinuously input. In FIG. 7, the horizontal axis represents time (h), and the vertical axis represents NPOC and T-N. NPOC is calculated based on, for example, TOC, and the measuring instrument for measuring TOC is installed, for example, in the biological treatment tank 20. T-N is calculated based on, for example, the EC value, and the measuring instrument for measuring the EC value is installed, for example, in the biological treatment tank 20. According to FIG. 7, even when the wastewater containing excrement is continuously input, it can be seen that by setting the aeration cycle to 3 hours and the anoxic cycle to 1 hour, the nitrogen component can be completely removed.

[0066] As described above, in the above embodiment, the water treatment apparatus 1 has a wastewater adjustment tank 10 for storing wastewater. The water treatment apparatus 1 has a first measuring means (measuring instrument 12) for measuring the quality of the wastewater flowing into the wastewater adjustment tank. The water treatment apparatus 1 has a one-tank type biological treatment tank 20 that switches between nitrification treatment and denitrification treatment for the wastewater supplied from the wastewater adjustment tank 10 by switching on / off the aeration. The water treatment apparatus 1 has a control means (control unit 50) for controlling the aeration time in the nitrification treatment based on the measurement result of the first measuring means 12. Thereby, the water treatment apparatus 1 can control the optimal aeration amount (including the aeration time) for the nitrification reaction in the one-tank type biological treatment tank 20 based on the quality of the wastewater input into the wastewater adjustment tank 10.

[0067] Therefore, according to the water treatment apparatus 1 according to the present embodiment, it is possible to provide a one-tank type nitrification and denitrification treatment capable of efficiently performing nitrification and denitrification in an environment where the quality of the water to be treated supplied fluctuates. Further, according to the water treatment apparatus 1, it is possible to suppress the power consumption by reducing the blower time. Further, according to the water treatment apparatus 1, since an optimal amount of hydrogen donor can be added according to the state of the wastewater, it is possible to suppress the consumption amount of the hydrogen donor.

[0068] Further, in the above embodiment, the control means 50 controls the aeration time based on the number of times the measured value measured by the first measurement means 12 is equal to or greater than the threshold value. Thereby, the water treatment apparatus 1 can switch between nitrification treatment and denitrification treatment with high precision.

[0069] Further, in the above embodiment, the control means 50 controls the aeration time based on the number of times the measured value measured by the first measurement means 12 is equal to or greater than the threshold value and the amount of the wastewater discharged from the wastewater adjustment tank 10 to the biological treatment tank 20. Thereby, the water treatment apparatus 1 can switch between nitrification treatment and denitrification treatment with higher precision.

[0070] Further, in the above embodiment, the water treatment apparatus 1 includes an input means (supply unit 80) for inputting a hydrogen donor into the biological treatment tank 20. The control means 50 sets the amount of the hydrogen donor based on the number of times the measured value measured by the first measurement means 12 is equal to or greater than the threshold value, and inputs the set amount of the hydrogen donor while switching off the aeration. By adding the hydrogen donor at the timing of switching off the aeration in this way, it becomes possible to immediately switch from an aerobic environment to an anaerobic state. Therefore, it becomes possible to instantaneously switch the environment as if the aerobic reaction and the anaerobic reaction are carried out in separate tanks.

[0071] Normally, after an aerobic environment, the air dissolved in the liquid cannot escape, so there has been a problem that the switch to an anaerobic state does not proceed, the treatment efficiency drops, or the treatment takes a long time. By adding the hydrogen donor at the timing of switching off the aeration, the environment in the tank immediately switches, so that efficient nitrification and denitrification are possible in a single biological treatment tank 20.

[0072] Further, the water treatment apparatus 1 can control the amount of the hydrogen donor suitable for switching the nitrification reaction to the denitrification reaction in the one-tank type biological treatment tank 20 based on the quality of the wastewater input into the wastewater adjustment tank 10.

[0073] Further, in the above embodiment, the water treatment apparatus 1 includes an input means 80 for inputting a hydrogen donor into the biological treatment tank 20. The control means 50 sets the amount of the hydrogen donor based on the number of times the measured value measured by the first measurement means 12 becomes equal to or greater than the threshold value and the amount of the wastewater discharged from the wastewater adjustment tank 10 to the biological treatment tank 20, and inputs the set amount of the hydrogen donor while switching off the aeration. Since the amount of the hydrogen donor is set based on the amount of the wastewater discharged from the wastewater adjustment tank 10 to the biological treatment tank 20, it becomes possible to set the usage amount of the hydrogen donor to a more appropriate amount, and it becomes possible to suppress the usage amount of the hydrogen donor.

[0074] Further, in the above embodiment, the water treatment apparatus 1 has a second measurement means 28 for measuring the quality of the treated water after treatment in the biological treatment tank 20. The control means 50 controls the aeration time based on the number of times the difference between the measured value measured by the first measurement means 12 and the measured value measured by the second measurement means 28 becomes equal to or greater than the threshold value. Thereby, even when the water is repeatedly circulated in the water treatment apparatus 1, the water treatment apparatus 1 can switch between nitrification treatment and denitrification treatment with high precision.

[0075] Further, in the above embodiment, the water treatment apparatus 1 has a second measurement means 28 for measuring the quality of the treated water after treatment in the biological treatment tank 20. The control means 50 controls the aeration time based on the number of times the difference between the measured value measured by the first measurement means 12 and the measured value measured by the second measurement means 28 becomes equal to or greater than the threshold value and the amount of the wastewater discharged from the wastewater adjustment tank 10 to the biological treatment tank 20. Thereby, even when the water is repeatedly circulated in the water treatment apparatus 1, the water treatment apparatus 1 can switch between nitrification treatment and denitrification treatment with higher precision.

[0076] In addition, in the above-described embodiment, the water treatment apparatus 1 includes an input means 80 for inputting a hydrogen donor into the biological treatment tank 20. The control means 50 sets the amount of the hydrogen donor based on the number of times the difference between the measured value measured by the first measurement means 12 and the measured value measured by the second measurement means becomes equal to or greater than a threshold value, and turns off the aeration and inputs the set amount of the hydrogen donor. By adding the hydrogen donor at the timing of switching off the aeration in this way, it becomes possible to immediately switch from an aerobic environment to an anaerobic state. Further, even when the water is repeatedly circulated in the water treatment apparatus 1, based on the water quality of the wastewater input into the wastewater adjustment tank 10, it is possible to control the amount of the hydrogen donor suitable for switching the nitrification reaction to the denitrification reaction in the one-tank biological treatment tank 20.

[0077] In addition, in the above-described embodiment, the water treatment apparatus 1 includes an input means 80 for inputting a hydrogen donor into the biological treatment tank 20. The control means 50 sets the amount of the hydrogen donor based on the number of times the difference between the measured value measured by the first measurement means 12 and the measured value measured by the second measurement means 28 becomes equal to or greater than a threshold value, and the amount of the wastewater supplied from the wastewater adjustment tank 10 to the biological treatment tank 20, turns off the aeration and inputs the set amount of the hydrogen donor. By adding the hydrogen donor at the timing of switching off the aeration in this way, it becomes possible to immediately switch from an aerobic environment to an anaerobic state. Further, even when the water is repeatedly circulated in the water treatment apparatus 1, since the amount of the hydrogen donor is set based also on the amount of the wastewater supplied from the wastewater adjustment tank 10 to the biological treatment tank 20, it becomes possible to set the usage amount of the hydrogen donor to a more appropriate amount in the one-tank biological treatment tank 20, and it becomes possible to suppress the usage amount of the hydrogen donor.

[0078] <Modification Example> In the above-described embodiment, the control unit 50 sets various parameters in the next series of steps based on the count value counted during the previous series of steps. However, the period for measuring the count is not limited to during the previous series of steps. For example, as shown in FIG. 5, depending on the previous count value, the aeration cycle and the anoxic cycle may become 0 minutes. In such a case, the period related to the series of steps becomes short, and the wastewater may not accumulate completely in the wastewater adjustment tank 10. Therefore, the following conditions may be set so that the wastewater is not introduced from the wastewater adjustment tank 10 into the biological treatment tank 20 until the conditions are satisfied. · That the wastewater adjustment tank 10 stores wastewater of a predetermined volume or more · That wastewater of a predetermined volume or more has been introduced into the wastewater adjustment tank 10

[0079] When the above conditions exist, for example, a water level gauge, a flow meter, or the like is installed in the wastewater adjustment tank 10.

[0080] The control unit 50 measures the count value, for example, after the input step, the nitrification step (0 minutes), the denitrification step (0 minutes), and the extraction step are completed, until at least one of the above conditions is satisfied. When the denitrification step (0 minutes) and the extraction step are completed and at least one of the above conditions is satisfied, the control unit 50 sets the parameters in the next series of steps based on the count value.

[0081] FIG. 8 is a flowchart showing another example of the operation of the control unit 50 when setting the parameters related to biological denitrification. In FIG. 8, the same numbers are assigned to the same processes as in FIG. 2.

[0082] In step S31, the control unit 50 determines whether or not a predetermined condition regarding the drainage of the drainage adjustment tank 10 is satisfied. Specifically, for example, the control unit 50 determines whether or not conditions such as that drainage of a predetermined volume or more is stored in the drainage adjustment tank 10, or that drainage of a predetermined volume or more has been introduced into the drainage adjustment tank 10 are satisfied. If the condition is not satisfied, the control unit 50 causes the process to proceed to step S32. If the condition is satisfied, the control unit 50 causes the process to proceed to step S14.

[0083] In step S32, the control unit 50 acquires the EC value measured by the measuring instrument 12, and measures a predetermined count value based on the acquired EC value. When the control unit 50 counts the number of times, it causes the process to proceed to step S31.

[0084] Further, in the above-described embodiment, the case where parameters related to biological denitrification are set with reference to the count value based on the EC value has been described. However, the setting of the parameters related to biological denitrification is not limited to referring only to the count value based on the EC value. For example, the control unit 50 may monitor the environment in the biological treatment tank 20 in the aeration cycle, and change the aeration cycle based on the monitoring result. Further, the control unit 50 may change the anoxic cycle based on the changed aeration cycle.

[0085] Specifically, for example, in the aeration cycle, the control unit 50 monitors the transition of DO, ORP, pH, T-N, NPOC, or at least any combination thereof in the biological treatment tank 20. When it is predicted that the nitrification treatment will end earlier than the set aeration cycle, the control unit 50 shortens the aeration cycle. The control unit 50 updates the anoxic cycle so that it becomes, for example, about 1 / 3 of the shortened aeration cycle. Further, the control unit 50 updates the addition amount of the hydrogen donor based on the shortened aeration cycle. By updating the parameters based on the environment in the biological treatment tank 20 in this way, it becomes possible to reflect the environment in the biological treatment tank 20 in real time in the control of biological denitrification. Therefore, the biological denitrification by the biological treatment tank 20 can be shortened in time, and it becomes possible to operate the biological denitrification in the biological treatment tank 20 more efficiently.

[0086] Further, the control unit 50 may monitor the concentration of carbon dioxide in the aeration cycle and update the aeration cycle so as to end the aeration cycle at the timing when it is estimated that the increase in the concentration of carbon dioxide stops. The control unit 50 updates the anoxic cycle based on the updated aeration cycle. Further, the control unit 50 updates the addition amount of the hydrogen donor based on the updated aeration cycle. Thereby, the biological denitrification by the biological treatment tank 20 can be shortened in time, and it becomes possible to operate the biological denitrification in the biological treatment tank 20 more efficiently.

[0087] Further, the control unit 50 monitors the T-N of the biological treatment tank 20 in the anoxic cycle, and when the T-N becomes equal to or less than a predetermined value, the control unit 50 may end the anoxic cycle and shift to the extraction process. Thereby, it becomes possible to shorten the time required for biological denitrification by the biological treatment tank 20.

[0088] In addition, in the above embodiment, the case where the supply unit 80 adds a hydrogen donor has been described as an example. However, the substance added from the supply unit 80 is not limited to a hydrogen donor. The supply unit 80 may add an organic substance. An organic substance is a compound supplied as a substrate for microorganisms in the biological treatment tank 20. When the circulation toilet 100 has not been used for a long time, the supply of wastewater containing organic substances to the biological treatment tank 20 is delayed. Therefore, the microorganisms in the biological treatment tank 20 may suffer from a shortage of substrates and die. To prevent this, it is necessary to supply an organic substance into the biological treatment tank 20. That is, by continuously supplying an organic substance to the biological treatment tank 20, it becomes possible to continuously supply a substrate to the facultative anaerobic bacteria present in the biological treatment tank 20. From the viewpoint of handleability, a fluid is desirable as the organic substance. Note that the fluid is not limited to a liquid and also includes a gel-like substance. Further, as the fluid, a low molecular structure is preferable, and for example, an organic compound having 3 or less carbon atoms is more preferable. This is because a compound having a low molecular structure with 3 or less carbon atoms has higher biodegradability.

[0089] The supply unit 80 may, for example, intermittently drip an organic substance into the biological treatment tank 20 continuously at a plurality of intervals, or may continuously drip an organic substance into the biological treatment tank 20 at a predetermined flow rate at all times. The supply amount of the organic substance from the supply unit 80 may be arbitrarily set. For example, the monthly supply amount of the organic substance may be set based on the amount of wastewater.

[0090] In addition, in the above embodiment, the case where the biological treatment module 3 includes the biological treatment tank 20, the stirrer 23, the membrane filtration unit 25, the blower 26, the blower 27, and the supply unit 80 has been described. However, the configuration of the biological treatment module 3 is not limited to this. The number of blowers included in the biological treatment module 3 may be one. That is, for example, the blower 27 may also serve as the blower 26. Further, the blower 26 may also serve as the blower 27.

[0091] <Basic Hardware Configuration of Computer> FIG. 9 is a block diagram showing the basic hardware configuration of computer 90. Computer 90 includes at least a processor 91, a main memory device 92, an auxiliary storage device 93, and a communication IF 99 (Interface). These are electrically connected to each other by a bus.

[0092] The processor 91 is hardware for executing an instruction set described in a program. The processor 91 is composed of an arithmetic unit, registers, peripheral circuits, and the like.

[0093] The main memory device 92 is for temporarily storing a program and data processed by the program and the like. For example, it is a volatile memory such as a DRAM (Dynamic Random Access Memory).

[0094] The auxiliary storage device 93 is a storage device for storing data and programs. For example, it includes a flash memory, an HDD (Hard Disc Drive), a magneto-optical disk, a CD-ROM, a DVD-ROM, a semiconductor memory, and the like.

[0095] The communication IF 99 is an interface for inputting and outputting signals for communicating with other computers via a network using a wired or wireless communication standard. The network is composed of various mobile communication systems constructed by the Internet, a LAN, a wireless base station, and the like. For example, the network includes 3G, 4G, 5G mobile communication systems, LTE (Long Term Evolution), a wireless network (e.g., Wi-Fi (registered trademark)) connectable to the Internet by a predetermined access point, and the like. When connecting wirelessly, communication protocols such as Z-Wave (registered trademark), ZigBee (registered trademark), Bluetooth (registered trademark), etc. are included. When connecting wired, the network also includes those directly connected by a USB (Universal Serial Bus) cable or the like.

[0096] Note that all or part of each hardware configuration can be provided in a distributed manner across a plurality of computers 90 and connected to each other via a network, thereby virtually realizing the computer 90. In this way, the computer 90 is a concept that includes not only a single housing or a computer 90 housed in a case, but also a virtualized computer system.

[0097] <Basic Functional Configuration of Computer 90> The functional configuration of the computer realized by the basic hardware configuration of the computer 90 shown in FIG. 9 will be described. The computer includes at least functional units of a control unit, a storage unit, and a communication unit.

[0098] Note that the functional units included in the computer 90 can also be realized by providing all or part of each functional unit in a distributed manner across a plurality of computers 90 interconnected by a network. The computer 90 is a concept that includes not only a single computer 90, but also a virtualized computer system.

[0099] The control unit is realized by the processor 91 reading out various programs stored in the auxiliary storage device 93 and expanding them in the main storage device 92, and executing processing according to the programs. The control unit can realize a functional unit that performs various information processes according to the type of program. Thereby, the computer is realized as an information processing device that performs information processing.

[0100] The storage unit is realized by the main storage device 92 and the auxiliary storage device 93. The storage unit stores data, various programs, and various databases. Also, the processor 91 can secure a storage area corresponding to the storage unit in the main storage device 92 or the auxiliary storage device 93 according to the program. Further, the control unit can cause the processor 91 to execute addition, update, and deletion processing of the data stored in the storage unit according to various programs.

[0101] A database refers to a relational database, which is used to manage a set of data called a tabular table structurally defined by rows and columns by associating them with each other. In a database, a table is called a table, a column of a table is called a column, and a row of a table is called a record. In a relational database, the relationships between tables can be set and associated. Normally, each table is set with a column that serves as a key for uniquely identifying a record, but setting a key for a column is not mandatory. The control unit can cause the processor 91 to add, delete, or update records in a specific table stored in the storage unit according to various programs.

[0102] The communication unit is realized by the communication IF99. The communication unit realizes the function of communicating with other computers 90 via a network. The communication unit can receive information transmitted from other computers 90 and input it to the control unit. The control unit can cause the processor 91 to perform information processing on the received information according to various programs. Also, the communication unit can transmit the information output from the control unit to other computers 90.

[0103] The functions realized by the components described in this specification may be implemented in circuitry or processing circuitry including a general-purpose processor, a specific-purpose processor, an integrated circuit, ASICs (Application Specific Integrated Circuits), a CPU (a Central Processing Unit), a conventional circuit, and / or a combination thereof, programmed to realize the described functions. A processor includes transistors and other circuits and is regarded as circuitry or processing circuitry. The processor may be a programmed processor that executes a program stored in a memory. In this specification, circuitry, units, and means are hardware programmed to implement the described functions, or hardware that executes them. The hardware may be any hardware disclosed in this specification, or any hardware known to be programmed or execute to implement the described functions. When the hardware is a processor regarded as a type of circuitry, the circuitry, means, or unit is a combination of hardware and software used to configure the hardware and / or the processor.

[0104] As described above, some embodiments of the present disclosure have been explained. However, these embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the gist of the invention. These embodiments and their modifications are to be included in the scope and gist of the invention, as well as in the invention described in the claims and the equivalent scope thereof.

[0105] <Supplementary Note> The matters described in each of the above embodiments are appended below. (Supplementary Note 1) A water treatment apparatus comprising a drainage adjustment tank for storing drainage, first measurement means for measuring the water quality of the drainage flowing into the drainage adjustment tank, a one-tank biological treatment tank for switching between nitrification treatment and denitrification treatment of the drainage supplied from the drainage adjustment tank by switching on / off aeration, and control means for controlling the aeration time in the nitrification treatment based on the measurement result of the first measurement means. (Supplementary Note 2) The control means controls the aeration time based on the number of times the measured value measured by the first measurement means is equal to or greater than a threshold value. The water treatment apparatus according to (Supplementary Note 1). (Supplementary Note 3) The control means controls the aeration time based on the number of times the measured value measured by the first measurement means is equal to or greater than a threshold value and the drainage volume of the drainage supplied from the drainage adjustment tank to the biological treatment tank. The water treatment apparatus according to (Supplementary Note 1). (Supplementary Note 4) An input means for inputting a hydrogen donor into the biological treatment tank, and the control means sets the amount of the hydrogen donor based on the number of times the measured value measured by the first measurement means is equal to or greater than the threshold value, and turns off the aeration and inputs the set amount of the hydrogen donor. The water treatment apparatus according to (Appendix 2) or (Appendix 3). (Appendix 5) An input means for inputting a hydrogen donor into the biological treatment tank, and the control means sets the amount of the hydrogen donor based on the number of times the measured value measured by the first measurement means is equal to or greater than the threshold value and the drainage volume of the drainage water supplied from the drainage adjustment tank to the biological treatment tank, and turns off the aeration and inputs the set amount of the hydrogen donor. The water treatment apparatus according to (Appendix 2) or (Appendix 3). (Appendix 6) Having a second measurement means for measuring the water quality of the treated water after treatment in the biological treatment tank, and the control means controls the aeration time based on the number of times the difference between the measured value measured by the first measurement means and the measured value measured by the second measurement means is equal to or greater than the threshold value. The water treatment apparatus according to (Appendix 1). (Appendix 7) Having a second measurement means for measuring the water quality of the treated water after treatment in the biological treatment tank, and the control means controls the aeration time based on the number of times the difference between the measured value measured by the first measurement means and the measured value measured by the second measurement means is equal to or greater than the threshold value and the drainage volume of the drainage water supplied from the drainage adjustment tank to the biological treatment tank. The water treatment apparatus according to (Appendix 1). (Appendix 8) An input means for inputting a hydrogen donor into the biological treatment tank, and the control means sets the amount of the hydrogen donor based on the number of times the difference between the measured value measured by the first measurement means and the measured value measured by the second measurement means is equal to or greater than the threshold value, and turns off the aeration and inputs the set amount of the hydrogen donor. The water treatment apparatus according to (Appendix 6) or (Appendix 7). (Appendix 9) A water treatment apparatus comprising an input means for inputting a hydrogen donor into a biological treatment tank, wherein the control means sets the amount of the hydrogen donor based on the number of times the difference between the measurement value measured by the first measurement means and the measurement value measured by the second measurement means is equal to or greater than a threshold value, and the amount of drainage of the drainage supplied from the drainage adjustment tank to the biological treatment tank, and switches off the aeration and inputs the set amount of the hydrogen donor. The water treatment apparatus according to (Appendix 6) or (Appendix 7). (Appendix 10) A method executed by a water treatment apparatus having a processor, the method comprising: a step of acquiring a measurement result of measuring the water quality of the drainage flowing into the drainage adjustment tank by the processor; a step of setting, based on the measurement result, the aeration time in the nitrification treatment in a one-tank biological treatment tank where the drainage is input from the drainage adjustment tank and the nitrification treatment and denitrification treatment for the drainage are switched and performed; and a step of switching the on / off of the aeration in the biological treatment tank based on the set aeration time. (Appendix 11) A system comprising a drainage adjustment tank for storing drainage, a first measurement means for measuring the water quality of the drainage flowing into the drainage adjustment tank, a one-tank biological treatment tank for switching between nitrification treatment and denitrification treatment for the drainage supplied from the drainage adjustment tank by switching the on / off of the aeration, and a control means for controlling the aeration time in the nitrification treatment based on the measurement result of the first measurement means. (Appendix 12) A program executed by a water treatment apparatus having a processor, the program causing the processor to perform a step of acquiring a measurement result of measuring the water quality of the drainage flowing into the drainage adjustment tank, a step of setting, based on the measurement result, the aeration time in the nitrification treatment in a one-tank biological treatment tank where the drainage is input from the drainage adjustment tank and the nitrification treatment and denitrification treatment for the drainage are switched and performed, and a step of switching the on / off of the aeration in the biological treatment tank based on the set aeration time.

Explanation of Reference Numerals

[0106] 1…Water treatment apparatus 10…Drainage adjustment tank 20…Biological treatment tank 30…Treated water storage tank 40…Ozone generator 50…Control unit 80…Supply unit 100…Circulating toilet

Claims

1. A drainage adjustment tank for storing drainage, First measuring means for measuring the water quality of the drainage flowing into the drainage adjustment tank, A biological treatment tank capable of switching the treatment for the drainage supplied from the drainage adjustment tank by switching on / off of aeration, Control means for controlling the aeration time in the treatment based on the measurement result of the first measuring means A water treatment apparatus comprising the same.

2. The water treatment apparatus according to claim 1, wherein the control means controls the aeration time based on the number of times the measured value measured by the first measuring means is equal to or greater than a threshold value.

3. The water treatment apparatus according to claim 1, wherein the control means controls the aeration time based on the number of times the measured value measured by the first measuring means is equal to or greater than a threshold value and the drainage volume of the drainage supplied from the drainage adjustment tank to the biological treatment tank.

4. Comprising an input means for inputting a hydrogen donor into the biological treatment tank, The water treatment apparatus according to claim 2 or 3, wherein the control means sets the amount of the hydrogen donor based on the number of times the measured value measured by the first measuring means is equal to or greater than a threshold value, and inputs the set amount of the hydrogen donor while switching off the aeration.

5. Comprising an input means for inputting a hydrogen donor into the biological treatment tank, The water treatment apparatus according to claim 2 or 3, wherein the control means sets the amount of the hydrogen donor based on the number of times the measured value measured by the first measuring means is equal to or greater than a threshold value and the drainage volume of the drainage supplied from the drainage adjustment tank to the biological treatment tank, and inputs the set amount of the hydrogen donor when the aeration is off.

6. Having second measuring means for measuring the water quality of the treated water after treatment in the biological treatment tank, The water treatment apparatus according to claim 1, wherein the control means controls the aeration time based on the number of times the difference between the measurement value measured by the first measurement means and the measurement value measured by the second measurement means becomes equal to or greater than a threshold value.

7. having second measurement means for measuring the quality of the treated water after treatment in the biological treatment tank, The water treatment apparatus according to claim 1, wherein the control means controls the aeration time based on the number of times the difference between the measurement value measured by the first measurement means and the measurement value measured by the second measurement means becomes equal to or greater than a threshold value and the amount of drainage discharged from the drainage adjustment tank to the biological treatment tank.

8. comprising input means for inputting a hydrogen donor into the biological treatment tank, The water treatment apparatus according to claim 6 or 7, wherein the control means sets the amount of the hydrogen donor based on the number of times the difference between the measurement value measured by the first measurement means and the measurement value measured by the second measurement means becomes equal to or greater than a threshold value, and inputs the set amount of the hydrogen donor when the aeration is off.

9. comprising input means for inputting a hydrogen donor into the biological treatment tank, The water treatment apparatus according to claim 6 or 7, wherein the control means sets the amount of the hydrogen donor based on the number of times the difference between the measurement value measured by the first measurement means and the measurement value measured by the second measurement means becomes equal to or greater than a threshold value and the amount of drainage discharged from the drainage adjustment tank to the biological treatment tank, and inputs the set amount of the hydrogen donor while switching off the aeration.

10. A method executed by a water treatment apparatus having a processor, the processor obtaining a measurement result of measuring the quality of drainage flowing into a drainage adjustment tank; setting, based on the measurement result, the time of aeration in the treatment in a biological treatment tank into which the drainage is introduced from the drainage adjustment tank and the treatment of the drainage is performed; switching on / off the aeration in the biological treatment tank based on the set aeration time A method of executing

11. A drainage adjustment tank for storing drainage, First measurement means for measuring the quality of the drainage flowing into the drainage adjustment tank, A single-tank biological treatment tank that performs treatment on the drainage supplied from the drainage adjustment tank by switching on / off aeration, Control means for controlling the aeration time in the treatment based on the measurement result of the first measurement means A system comprising

12. A program executed by a water treatment device having a processor, the program causing the processor to Obtain a measurement result of measuring the quality of the drainage flowing into the drainage adjustment tank, Set the aeration time in the nitrification treatment in a biological treatment tank into which the drainage is introduced from the drainage adjustment tank and in which nitrification treatment and denitrification treatment can be switched, based on the measurement result, Switch on / off the aeration in the biological treatment tank based on the set aeration time A program to be executed.

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