Water treatment device, program, method, and system

Abstract

To more effectively decolorize water in a water treatment device that generates circulating water. [Solution] The water treatment device of this embodiment comprises a sensor that measures the water quality of the water passing through, a valve that selectively sends the water whose quality has been measured to the first flow path, the second flow path, or the third flow path, a chemical treatment module that performs chemical treatment on the water supplied from the first flow path, a physical treatment module that performs physical treatment on the water supplied from the second flow path, and a control unit that controls the opening and closing of the valve based on the sensing results of the sensor, and performs treatment in at least one of the chemical treatment module and the physical treatment module for a predetermined period of time, after which the water is sent out from the third flow path.

Description

[Technical Field]

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

[0002] Patent Document 1 describes a technology in which wastewater is subjected to a predetermined treatment in a flow path between a solid / liquid separation tank and a water tank, thereby making it reusable. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2021-184988 Summary of the Invention [Problem to be solved by the invention]

[0004] Patent Document 1 describes decolorization, but does not mention effective decolorization.

[0005] An object of the present disclosure is to more effectively decolorize water in a water treatment device that generates circulating water. [Means for solving the problem]

[0006] The water treatment device of this embodiment includes a sensor that measures the water quality of the water passing through, a valve that selectively sends the water whose quality has been measured to the first flow path, the second flow path, or the third flow path, a chemical treatment module that performs chemical treatment on the water supplied from the first flow path, a physical treatment module that performs physical treatment on the water supplied from the second flow path, and a control unit that controls the opening and closing of the valve based on the sensing results of the sensor, and performs treatment in at least one of the chemical treatment module and the physical treatment module for a predetermined period of time, after which the water is sent out from the third flow path. [Effects of the Invention]

[0007] According to the present disclosure, in a water treatment device that generates circulating water, water can be more effectively decolorized. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a diagram showing the overall configuration of an example of a water treatment device 1. FIG. [Figure 2] FIG. 2 is a block diagram showing an example of the configuration of a decolorization processing unit 40. [Figure 3] 10 is a flowchart showing an example of the operation of the control unit 50 when the decolorization processing unit 40 performs the decolorization processing. [Figure 4] FIG. 2 is a block diagram showing an example of the configuration of a decolorization processing unit 40. [Figure 5] FIG. 2 is a block diagram showing an example of the configuration of a decolorization processing unit 40. [Figure 6] FIG. 2 is a block diagram showing an example of the configuration of a decolorization processing unit 40. [Figure 7] FIG. 2 is a block diagram showing an example of the configuration of a decolorization processing unit 40. [Figure 8] FIG. 2 is a block diagram showing the basic hardware configuration of a computer 90. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. In all drawings describing the embodiments, common components are designated by the same reference numerals, and repeated description will be omitted. Note that the following embodiments do not unduly limit the content of the present disclosure described in the claims. Furthermore, not all components shown in the embodiments are necessarily essential components of the present disclosure. Furthermore, each drawing is a schematic diagram and is not necessarily a precise illustration.

[0010] In the following description, a "processor" refers to one or more processors. The at least one processor is typically a microprocessor such as a CPU (Central Processing Unit), but may also be another type of processor such as a GPU (Graphics Processing Unit). The at least one processor may be single-core or multi-core.

[0011] Furthermore, the at least one processor may be a processor in the broad sense, such as a hardware circuit (for example, a field-programmable gate array (FPGA) or an application-specific integrated circuit (ASIC)) that performs part or all of the processing.

[0012] In the following explanation, information that produces an output for an input may be described using expressions such as "xxx table," but this information may be data of any structure, or may be a learning model such as a neural network that produces an output for an input. Therefore, an "xxx table" may be referred to as "xxx information."

[0013] Furthermore, in the following description, the configuration of each table is an example, and one table may be divided into two or more tables, or all or part of two or more tables may be one table.

[0014] In addition, in the following explanation, processing may be described using the "program" as the subject, but since a program is executed by a processor to perform specified processing while appropriately using a memory unit and / or an interface unit, etc., the subject of the processing may also be the processor (or a device such as a controller that has that processor).

[0015] The program may be installed in a device such as a computer, or may be stored in, for example, a program distribution server or a computer-readable (e.g., non-transitory) recording medium. Also, in the following description, two or more programs may be realized as one program, or one program may be realized as two or more programs.

[0016] Furthermore, in the following description, identification numbers are used as identification information for various objects, but other types of identification information (for example, identifiers including alphabetic characters or symbols) may also be used.

[0017] In addition, in the following description, when describing elements of the same type without distinguishing between them, reference symbols (or common symbols among the reference symbols) may be used, and when describing elements of the same type with distinction between them, the identification numbers (or reference symbols) of the elements may be used.

[0018] In the following description, the control lines and information lines are those that are considered necessary for the description, and do not necessarily represent all the control lines and information lines in the product. All components may be interconnected.

[0019] Each information processing device is configured by a computer having an arithmetic unit and a storage unit. The basic hardware configuration of the computer and the basic functional configuration of the computer realized by the hardware configuration will be described later.

[0020] <1. Overview> The water treatment device according to this embodiment is a device for circulating and regenerating wastewater discharged from a consumer (hereinafter simply referred to as wastewater). The regenerated water can be used for daily life purposes such as flushing toilets, baths, showers, laundry, and dishwashing. The regenerated water may also be used as drinking water. In other words, the water treatment device is a small-sized circulating water treatment device.

[0021] The decolorization treatment unit according to this embodiment is, for example, a device for decolorizing treated wastewater in a water treatment device. The decolorization treatment unit includes multiple types of decolorization treatment modules and a sensor for sensing predetermined values related to water quality. The decolorization treatment unit sets a combination and treatment order of the decolorization treatment modules based on the sensing results of the water circulating in the water treatment device. The decolorization treatment unit decolorizes the circulating water using the decolorization treatment modules in the set combination and treatment order.

[0022] <2. Overall structure> The overall configuration of a water treatment device 1 according to this embodiment will be described. Fig. 1 is a diagram showing the overall configuration of an example of a water treatment device 1. Fig. 1 shows an example in which the water treatment device 1 is used in a circulation toilet 100.

[0023] The circulating toilet 100 according to this embodiment is used, for example, as a toilet in a residence, vacation home, mountain hut, temporary housing, or mobile home built in an area where water supply and sewage systems are not available, such as a mountainous region. The circulating toilet 100 is also used, for example, as a temporary toilet installed at an outdoor event venue, a construction site, or a disaster evacuation shelter. By using the circulating toilet 100, wastewater can be treated and reused as circulating water, so the toilet can be used even in areas where water supply and sewage systems are not available.

[0024] The water treatment device 1 according to this embodiment can be used in applications other than the recycling toilet 100. The water treatment device 1 may be used, for example, to reclaim wastewater used in a kitchen, a washroom (laundry), a bathroom, etc. In this case, for example, a filtration unit, a UV sterilization unit, etc. may be installed in the water treatment device 1 between the final-stage water tank and the actual water use by the consumer. The filtration unit may be realized by physical filtration such as a reverse osmosis membrane, a nanofiltration membrane, an ultrafiltration membrane, or a microfiltration membrane, or by biological filtration or chemical filtration such as zeolite or ion exchange resin. The filtration unit may also be realized by an activated carbon filter that combines physical filtration and chemical filtration. The UV sterilization unit sterilizes the water. In addition, in the water treatment device 1, toilet wastewater and wastewater used in a kitchen, washroom (laundry), bathroom, etc. may be treated in different treatment systems.

[0025] As shown in FIG. 1, the water treatment device 1 is connected to a toilet bowl 2 via multiple drain pipes. The water treatment device 1 includes a wastewater adjustment tank 10, a biological treatment tank 20, a treated water storage tank 30, and a decolorization treatment unit 40. The wastewater adjustment tank 10, the biological treatment tank 20, the treated water storage tank 30, and the decolorization treatment unit 40 are connected via multiple drain pipes to allow water to be transported between the components. Each of the multiple drain pipes is provided with a pump, and the operation of each pump is controlled so that the water level in the destination tank remains within a predetermined range and so that constant, continuous operation is achieved as much as possible. Note that FIG. 1 is merely an example, and the water treatment device 1 may have other configurations. For example, the wastewater adjustment tank 10, the biological treatment tank 20, and the treated water storage tank 30 may be included in a single module that performs a series of processes. Furthermore, at least some of the pumps in the water treatment device 1 are not required, and water may be transported using other physical phenomena, such as gravity, overflow, or the siphon principle. The biological treatment tank 20 may also be omitted.

[0026] 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. The water treatment device 1 also includes, for example, a sensor unit for detecting various physical properties in the wastewater adjustment tank 10, the biological treatment tank 20, the treated water storage tank 30, the decolorization treatment unit 40, or pipes connected to these.

[0027] <3. Drainage adjustment tank 10> The wastewater adjustment tank 10 is placed downstream of the toilet 2 and temporarily stores the wastewater discharged from the toilet 2. For example, a pulverizing pressure pump may be installed in the toilet 2. The pulverizing pressure pump pulverizes waste and other matter contained in the wastewater and sends the pulverized waste to the wastewater adjustment tank 10 together with the wastewater.

[0028] The wastewater adjustment tank 10 is provided with a blower 11. The blower 11 continuously or intermittently sends air into the interior of the wastewater adjustment tank 10. The air sent out from the blower 11 agitates the wastewater stored inside the wastewater adjustment tank 10. A pump 66 is installed between the wastewater adjustment tank 10 and the biological treatment tank 20. The pump 66 sends the wastewater stored in the wastewater adjustment tank 10 to the biological treatment tank 20.

[0029] A measuring instrument 12 is installed in or near the wastewater adjustment tank 10 to measure the quality of the wastewater flowing into the wastewater adjustment tank 10. Specifically, the measuring instrument 12 is installed, for example, in the flow path before the wastewater adjustment tank 10, in the inlet of the wastewater adjustment tank 10, in a space inside the wastewater adjustment tank 10, or in the wastewater inside the wastewater adjustment tank 10. The measuring instrument 12 measures, for example, the electrical conductivity of the wastewater. The measuring instrument 12 transmits the EC value as the measurement result to the control unit 50.

[0030] <4. Biological treatment tank 20> An example of the configuration of the biological treatment tank 20 will be described. The biological treatment tank 20 uses microorganisms to decompose organic compounds contained in the wastewater discharged from the wastewater adjustment tank 10. The biological treatment tank 20 also performs biological denitrification, which removes nitrogen compounds through the action of microorganisms. Biological denitrification uses a combination of aerobic bacteria and facultative anaerobic bacteria to decompose nitrogen and carbon compounds in the wastewater. Biological denitrification includes a nitrification process carried out in an aerobic environment and a denitrification process carried out in an anaerobic environment.

[0031] In the nitrification process, nitrogen components in wastewater are oxidized to nitrite or nitrate by nitrifying bacteria. Nitrifying bacteria are a type of aerobic bacteria that require the presence of sufficient dissolved oxygen in the tank.

[0032] In the denitrification process, the water nitrified in the nitrification process is placed under anaerobic conditions without dissolved oxygen, and anaerobic respiration by denitrifying bacteria is utilized to reduce nitrite and nitrate to nitrogen gas.

[0033] The biological treatment tank 20 is formed, for example, as a single tank, and the nitrification process and the denitrification process are carried out in this single tank. The biological treatment tank 20 is equipped with an agitator 23, a membrane filtration unit 25, a blower 26, and a blower 27. The agitator 23 is realized, for example, by a mixer with agitating blades. The agitator 23 agitates the mixed liquid by rotating the agitating blades, for example, at a timing based on the control of the control unit 50, thereby promoting contact between the microorganisms contained in the mixed liquid and organic matter, etc. In this way, the agitator 23 is driven in the denitrification process.

[0034] The membrane filtration unit 25 is realized by, for example, at least one of an MF (microfiltration membrane), an UF (ultrafiltration membrane), an NF (nanofiltration membrane), a ceramic filter, and a metal membrane. The membrane filtration unit 25 filters the biologically treated water to produce treated water. A pump 67 is installed between the biological treatment tank 20 and the decolorization treatment unit 40. The pump 67 sends the treated water filtered by the membrane filtration unit 25 to the decolorization treatment unit 40.

[0035] The blower 26 supplies air (or oxygen) into the inside of the biological treatment tank 20, for example, at a timing based on the control of the control unit 50. The air supplied from the blower 26 maintains aerobic circulation in the nitrification process.

[0036] 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.

[0037] 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 provides hydrogen to other substances in the biological treatment tank 20 to reduce them, and is itself dehydrogenated and oxidized. The hydrogen donor may be, for example, an alcohol such as methanol or ethanol, or a sugar such as glucose.

[0038] Although FIG. 1 shows a case where the biological treatment tank 20 is formed as a single tank, the configuration of the biological treatment tank 20 is not limited to this. The biological treatment tank 20 may not be a single tank, but may include an anoxic tank and an aerobic tank. The anoxic tank is located upstream of the aerobic tank 22. Facultative anaerobic bacteria are present in the mixed liquor in the anoxic tank. A denitrification process is mainly carried out in the anoxic tank. Aerobic bacteria are present in the mixed liquor in the aerobic tank. A nitrification process is mainly carried out in the aerobic tank.

[0039] <5. Bleaching Processing Unit 40> An example of the configuration of the decolorization treatment unit 40 will be described. FIG. 2 is a block diagram showing an example of the configuration of the decolorization treatment unit 40. The decolorization treatment unit 40 performs decolorization treatment on water supplied from the biological treatment tank 20. The decolorization treatment unit 40 shown in FIG. 2 includes an intermediate tank 41, a sensor 42, solenoid valves 431 to 433, a filtration module 44, and an ozone treatment module 45. Pumps are installed between each component as needed. The locations where the pumps are installed and the number of pumps installed can be adjusted as needed. Therefore, they are not shown in FIG. 2.

[0040] The intermediate tank 41 is a tank that holds water supplied from the biological treatment tank 20. The intermediate tank 41 is also a tank that holds water that has passed through the filtration module 44. The intermediate tank 41 is also a tank that holds water that has passed through the ozone treatment module 45. The water held in the intermediate tank 41 is sent from the intermediate tank 41 to the valve group 43 via the sensor 42 by the control unit 50 driving the pump at a predetermined timing. The predetermined timing is, for example, as follows. - When the specified time arrives - When a specified period of time has elapsed since the pump was first started The timing when the water level measured by the water level meter installed inside the intermediate tank 41 reaches a predetermined value.

[0041] In the intermediate tank 41, for example, water is sucked from a deep portion, and the sucked water is sent from the intermediate tank 41 to the valve group 43 via the sensor 42.

[0042] The sensor 42 is a sensor that measures water quality. The sensor 42 is realized by, for example, an optical sensor or an electrical conductivity meter. More specifically, the optical sensor is a turbidity meter, a colorimeter, a transparency meter (which may also be called an opacity meter), or the like. The sensor 42 transmits the measured sensing value to the control unit 50. The sensing value may be an actual measurement value, a measurement value based on the actual measurement value, or an index based on the actual measurement value. For example, an evaluation index that combines turbidity and color may be called opacity.

[0043] The valve group 43 includes solenoid valves 431 to 433. The opening and closing of the solenoid valves 431 to 433 is controlled by instructions from the control unit 50. The solenoid valve 431 is connected to the ozone treatment module 45. When the solenoid valve 431 is set to the "open" state by instructions from the control unit 50, the water supplied to the valve group 43 is supplied to the ozone treatment module 45 via the solenoid valve 431. The solenoid valve 432 is connected to the filtration module 44. When the solenoid valve 432 is set to the "open" state by instructions from the control unit 50, the water supplied to the valve group 43 is supplied to the filtration module 44 via the solenoid valve 432. The solenoid valve 433 is connected to a flow path leading to the treated water storage tank 30. When the solenoid valve 433 is set to the "open" state by instructions from the control unit 50, the water supplied to the valve group 43 is supplied to the flow path leading to the treated water storage tank 30 via the solenoid valve 433. A pump 68 is installed between the decolorization treatment unit 40 and the treated water storage tank 30. The pump 68 sends the treated water decolorized in the decolorization treatment unit 40 to the treated water storage tank 30. The valve group 43 may be a plurality of three-way switching valves. Alternatively, it may be a single switching valve that can be switched in multiple directions.

[0044] The filtration module 44 removes, for example, water pollutants from the supplied water. The filtration module 44 is an example of a decolorization treatment module using physical treatment. Physical treatment is, for example, treatment that applies a physical action to water. The filtration module 44 may also be referred to as a physical treatment module. The filtration module 44 is realized, for example, by a filter medium or the like. Specifically, the filtration module 44 includes, for example, an activated carbon filter. Treatment using an activated carbon filter is both a physical treatment and a chemical treatment. In this embodiment, treatment using an activated carbon filter is described as a physical treatment. The filtration module 44 may be, for example, a combination of an activated carbon filter and a thread-wound filter, or a combination of an activated carbon filter and another filter (for example, a sediment filter, a microfiltration (MF) membrane, an ultrafiltration (UF) membrane, a nanofiltration (NF) membrane, a ceramic filter, an ion exchange filter, a metal membrane, etc.). In the case of a combination of an activated carbon filter and another filter, for example, the other filter is disposed upstream of the activated carbon filter. The water that passes through the filtration module 44 is delivered to the intermediate tank 41 .

[0045] The ozone treatment module 45 decolorizes, sterilizes, and deodorizes the supplied water using ozone gas. The ozone treatment module 45 is an example of a chemical decolorization treatment module. More specifically, the ozone treatment module 45 is a module that uses an advanced oxidation method among chemical treatments. Chemical treatment, for example, involves applying a chemical action to water. Examples of chemical treatments include chemical coagulation and sedimentation, advanced oxidation, and ion exchange. In this embodiment, advanced oxidation is preferred. The ozone treatment module 45 is implemented, for example, by an ozone tank. The ozone tank is a tank filled with ozone gas generated by a specific method. Ozone gas can be generated by, for example, a discharge method (silent discharge method), an electrolysis method (water electrolysis cell method), or an ultraviolet method (mercury UV lamp method or mercury-free UV lamp (excimer lamp) method). The water supplied to the ozone treatment module 45 is poured into the ozone tank from below and exposed to ozone gas, which has strong oxidizing power, inside the ozone tank. The water poured into the ozone tank is discharged from a discharge port located at a predetermined height in the ozone tank. The water discharged from the ozone tank is sent to the intermediate tank 41.

[0046] <6. Control unit 50> The control unit 50 controls the overall operation of the water treatment device 1. Specifically, the control unit 50 controls the water decolorization treatment in the decolorization treatment unit 40, for example.

[0047] The control unit 50 appropriately sets the processing time in the decolorization treatment module and the sensing value to be reached according to the level of the sensing value (chromaticity) acquired by the sensor 42 so as to optimize the total processing time of the entire decolorization treatment. Note that chromaticity may be replaced with other indicators. Optimizing the total processing time means, for example, shortening the total processing time as much as possible. The total processing time is set so as not to exceed, for example, the processing cycle set in the biological treatment tank 20. The processing time in a specific decolorization treatment module may include, for example, a minimum processing time required to maintain the decolorization treatment at a minimum, a maximum processing time representing the limit of the decolorization treatment that can be maintained, or a combination of these. The sensing value to be reached may be, for example, an absolute value or a relative value. If it is a relative value, for example, the rate of change of the sensing value may be set.

[0048] For example, if the chromaticity is lower than a predetermined value, the control unit 50 sets the processing time and the sensing value to be reached for only the filtration module 44. That is, the control unit 50 performs the bleaching process using only the filtration module 44. Alternatively, if the chromaticity is higher than a predetermined value, the control unit 50 sets the processing time and the sensing value to be reached for the ozone treatment module 45, and then sets the processing time and the sensing value to be reached for the filtration module 44. That is, the control unit 50 performs the bleaching process using the ozone treatment module 45 until the chromaticity falls within a predetermined range, and then performs the bleaching process using the filtration module 44 until the chromaticity falls to a predetermined low level. The control unit 50 may proceed to the next bleaching module after the predetermined processing time has elapsed, even if the sensing value to be reached has not been reached. Alternatively, the control unit 50 may proceed to the next bleaching module even if the predetermined processing time has not elapsed if the effect of the current bleaching module is weak (for example, if the rate of change in chromaticity reduction becomes small). The control unit 50 may also monitor the rate of change of the sensing value for each repeated treatment in one bleaching treatment module and adjust the next bleaching treatment based on the trend of the rate of change. That is, for example, if the rate of change of chromaticity is small even after repeated treatment in the ozone treatment module 45, the control unit 50 may transition to treatment in the filtration module 44.

[0049] The control unit 50, for example, refers to a preset processing table and sets the processing time for a specific bleaching processing module and the sensing value to be reached. Note that the setting of the processing time for a specific bleaching processing module and the sensing value to be reached is not limited to referring to a processing table, and other methods can also be used. For example, a trained model may be used in which the sensing value is used as input and the processing time for a specific bleaching processing module and the sensing value to be reached are trained as correct output data.

[0050] The control unit 50 controls the pumps and electromagnetic valves 431 to 433 so as to supply water to the selected decolorization treatment module, for example.

[0051] Specifically, for example, when supplying water to the filtration module 44, the control unit 50 issues an instruction to the solenoid valve 432 to open and an instruction to the solenoid valves 431 and 433 to close. The control unit 50 also controls the pump to supply water to the filtration module 44 at a predetermined flow rate. The control unit 50 may control the flow rate by adjusting the opening degree or opening / closing speed of the solenoid valve 432. The control unit 50 controls the pump and the solenoid valves 431 to 433 to maintain the supply of water to the filtration module 44 until the sensing value reaches a predetermined value. The control unit 50 also controls the pump and the solenoid valves 431 to 433 to maintain the supply of water to the filtration module 44 until the maximum treatment time has elapsed, even if the sensing value does not reach the predetermined value. The control unit 50 also controls the pump and the solenoid valves 431 to 433 to maintain the supply of water to the filtration module 44 for at least the minimum treatment time. The control unit 50 may, for example, combine at least two of these control requirements.

[0052] Furthermore, for example, when supplying water to the ozone treatment module 45, the control unit 50 issues an instruction to the solenoid valve 431 to open and an instruction to the solenoid valves 432 and 433 to close. The control unit 50 also controls the pump to supply water to the ozone treatment module 45 at a predetermined flow rate. The control unit 50 may control the flow rate by adjusting the opening degree or opening / closing speed of the solenoid valve 431. For example, the control unit 50 controls the pump and the solenoid valves 431 to 433 to maintain the supply of water to the ozone treatment module 45 until the sensing value reaches a predetermined value. For example, the control unit 50 controls the pump and the solenoid valves 431 to 433 to maintain the supply of water to the ozone treatment module 45 until the maximum treatment time has elapsed, even if the sensing value does not reach the predetermined value. For example, the control unit 50 also controls the pump and the solenoid valves 431 to 433 to maintain the supply of water to the ozone treatment module 45 for at least the minimum treatment time. For example, the control unit 50 may combine at least two of these control requirements.

[0053] Furthermore, for example, when supplying water to a flow path leading to the treated water storage tank 30, the control unit 50 issues an instruction to open the solenoid valve 433 and an instruction to close the solenoid valves 431 and 432. The control unit 50 also controls the pump so as to send water to the treated water storage tank 30 at a predetermined flow rate. The control unit 50 may control the flow rate by adjusting the opening degree or opening / closing speed of the solenoid valve 433. When the decolorization treatment using the filtration module 44 and the ozone treatment module 45 is completed, the control unit 50 controls the pump and the solenoid valves 431 to 433 so as to discharge water into the treated water storage tank 30.

[0054] <7. Treated Water Storage Tank 30> The treated water storage tank 30 is a tank that stores treated water obtained by biologically treating wastewater. That is, the treated water storage tank 30 stores treated water to be supplied to the toilet 2. In other words, the treated water storage tank 30 stores treated water that has been decolorized in the decolorization treatment unit 40. The treated water storage tank 30 is connected to a pipe 41 that leads to the toilet 2.

[0055] A pump 63 provided in the pipe 41 supplies treated water for flushing 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 pump 63 may be driven in response to an instruction from the user or in response to detection of use of the toilet 2. Furthermore, if it is expected that the recycling toilet 100 will not be used for an extended period of time, the pump 63 may be driven at predetermined intervals.

[0056] 8. Operation of the Decolorization Processing Unit 40 The bleaching process in the bleaching unit 40 will be described in detail below.

[0057] 3 is a flowchart illustrating an example of the operation of the control unit 50 when the decolorization processing unit 40 performs a decolorization process. In FIG. 3, the operation of the control unit 50 is described when the decolorization process is performed by the filtration module 44 after the decolorization process by the ozone processing module 45. However, the process of the decolorization processing unit 40 is not limited to this. For example, only the decolorization process by the filtration module 44 may be performed, or the decolorization process by the filtration module 44 and the decolorization process by the ozone processing module 45 may be performed, followed by the decolorization process by the filtration module 44, which may be repeated.

[0058] Furthermore, Figure 3 illustrates the operation of the control unit 50 when decolorization processing is performed by the filtration module 44 after decolorization processing is performed by the ozone treatment module 45, but before the decolorization processing by the ozone treatment module 45, a process may be performed to push out the remaining water remaining in the ozone tank of the ozone treatment module 45 from the previous batch into the intermediate tank 41.

[0059] In step S11, the control unit 50 causes the decolorization treatment unit 40 to perform decolorization treatment using the ozone treatment module 45. Specifically, the control unit 50 opens a valve to supply water treated in the biological treatment tank 20 to the intermediate tank 41. When the water in the intermediate tank 41 exceeds a predetermined value, the control unit 50 closes the valve, opens the solenoid valve 431, and closes the solenoid valves 432 and 433, causing the water flowing into the intermediate tank 41 to circulate between the ozone treatment module 45 and the intermediate tank 41. The control unit 50 controls, for example, the opening and closing speed of the solenoid valve 431 so that the flow rate of the circulated water becomes a predetermined value.

[0060] In step S12, the control unit 50 determines whether the requirements for ending the decolorization treatment by the ozone treatment module 45 have been met. Specifically, the control unit 50 determines whether circulation between the intermediate tank 41 and the ozone treatment module 45 has been maintained for, for example, a first time threshold or longer. In other words, the control unit 50 determines whether a minimum treatment time has elapsed since the decolorization treatment by the ozone treatment module 45 began. If the time for which circulation has continued has not reached the first time threshold, the control unit 50 continues the treatment.

[0061] If the time during which the cycle continues has exceeded the first time threshold, the control unit 50 determines whether the value of the sensor 42 has become equal to or less than the first sensing threshold. More specifically, if the sensing value output from the sensor 42 is chromaticity, the control unit 50 determines, for example, whether the chromaticity has decreased to the first sensing threshold. If the value of the sensor 42 is equal to or less than the first sensing threshold, the control unit 50 proceeds to step S13.

[0062] If the value of the sensor 42 exceeds the first sensing threshold, the control unit 50 determines, for example, whether the maintenance of circulation between the intermediate tank 41 and the ozone treatment module 45 has reached a second time threshold. That is, the control unit 50 determines whether the maximum treatment time has elapsed since the start of the decolorization treatment by the ozone treatment module 45. If the time during which the circulation has continued has reached the second time threshold, the control unit 50 shifts the process to step S13 even if the value of the sensor 42 exceeds the first sensing threshold. If the time during which the circulation has continued has not reached the second time threshold and the value of the sensor 42 exceeds the first sensing threshold, the control unit 50 continues the decolorization treatment by the ozone treatment module 45.

[0063] In step S13, the control unit 50 causes the decolorization processing unit 40 to perform decolorization processing using the filtration module 44. Specifically, the control unit 50 opens the solenoid valve 432 and closes the solenoid valves 431 and 433, and circulates the water stored in the intermediate tank 41 between the filtration module 44 and the intermediate tank 41. The control unit 50 controls, for example, the opening and closing speed of the solenoid valve 432 so that the flow rate of the circulating water becomes a predetermined value.

[0064] In step S14, the control unit 50 determines whether the conditions for ending the bleaching treatment by the filtration module 44 have been met. Specifically, the control unit 50 determines whether circulation between the intermediate tank 41 and the filtration module 44 has been maintained for, for example, a third time threshold or longer. In other words, the control unit 50 determines whether a minimum treatment time has elapsed since the bleaching treatment by the filtration module 44 began. The third time threshold is, for example, shorter than the first time threshold. If the time for which circulation has continued has not reached the third time threshold, the control unit 50 continues the treatment.

[0065] If the time during which the cycle continues has exceeded the third time threshold, the control unit 50 determines whether the value of the sensor 42 has become equal to or less than the second sensing threshold. More specifically, if the sensing value output from the sensor 42 is chromaticity, the control unit 50 determines, for example, whether the chromaticity has decreased to the second sensing threshold. If the value of the sensor 42 is equal to or less than the second sensing threshold, the control unit 50 proceeds to step S15. The second sensing threshold is, for example, lower than the first sensing threshold.

[0066] If the value of the sensor 42 exceeds the second sensing threshold, the control unit 50 determines, for example, whether the maintenance of circulation between the intermediate tank 41 and the filtration module 44 has reached a fourth time threshold. That is, the control unit 50 determines whether the maximum processing time has elapsed since the start of the bleaching process by the filtration module 44. The fourth time threshold is, for example, shorter than the second time threshold. If the duration of the circulation reaches the fourth time threshold, the control unit 50 proceeds to step S15 even if the value of the sensor 42 exceeds the second sensing threshold. If the duration of the circulation has not reached the fourth time threshold and the value of the sensor 42 exceeds the second sensing threshold, the control unit 50 continues the bleaching process by the filtration module 44.

[0067] In step S15, the control unit 50 sends the water that has been decolorized to the treated water storage tank 30. Specifically, the control unit 50 opens the solenoid valve 433, closes the solenoid valves 431 and 432, and sends the water stored in the intermediate tank 41 to the treated water storage tank 30.

[0068] As described above, the decolorization treatment unit 40 of the above embodiment comprises a sensor 42 that measures the water quality of the treated water, a valve 43 that selectively sends the treated water, whose quality has been measured, to the first flow path, the second flow path, or the third flow path, a chemical treatment module (ozone treatment module 45) that performs chemical treatment on the water supplied from the first flow path, a physical treatment module (filtration module 44) that performs physical treatment on the water supplied from the second flow path, and a control unit 50 that controls the opening and closing of the valve 43 based on the sensing results of the sensor 42, and performs treatment in at least one of the chemical treatment module and the physical treatment module for a predetermined period of time, after which the water is sent out from the third flow path.

[0069] If the order of decolorization treatment modules is fixed, for example, with the ozone treatment module installed after the filtration module, the activated carbon filter in the filtration module will be heavily loaded, potentially shortening its replacement lifespan. Furthermore, because most chromatic components are removed by the activated carbon filter, the decolorization effect of ozone cannot be determined. Furthermore, because the water passes through the filtration module before the ozone treatment module, clogging of the activated carbon filter reduces the flow rate in the circulation line. The decolorization treatment unit 40 of this embodiment can decolorize water while distributing the load on each decolorization treatment module by switching the combination and order of the decolorization treatment modules (chemical treatment module and physical treatment module) according to the water quality (color) and varying the treatment time using the decolorization treatment module. Furthermore, it can extend the lifespan of each decolorization treatment module.

[0070] Therefore, the decolorization treatment unit 40 according to this embodiment can more effectively decolorize water in a water treatment apparatus that generates circulating water, and can also contribute to streamlining the entire water treatment process.

[0071] In the above embodiment, the control unit 50 performs circulation in at least one of the chemical treatment module and the physical treatment module based on the sensing result of the sensor 42. This allows the bleaching unit 40 to perform the bleaching treatment more effectively.

[0072] <9. Variations> In the above embodiment, the decolorizing processing unit 40 is described as having the components shown in Fig. 2. However, the components of the decolorizing processing unit 40 are not limited to those shown in Fig. 2. Modified examples of the decolorizing processing unit 40 are shown below. Note that the configurations of the decolorizing processing unit 40 shown below may be combined with each other.

[0073] 9.1. First Modification of the Decolorization Processing Unit 40 FIG. 4 is a block diagram showing an example of the configuration of the decolorization treatment unit 40. The decolorization treatment unit 40 performs decolorization treatment on water supplied from the biological treatment tank 20. Specifically, the decolorization treatment unit 40 performs, for example, decolorization treatment using a filtration module 44, decolorization treatment using an ozone treatment module 45, and decolorization treatment using a supply unit 46 on the water supplied from the biological treatment tank 20. The decolorization treatment unit 40 shown in FIG. 4 includes an intermediate tank 41, a sensor 42, a supply unit 46, solenoid valves 431 to 433, a filtration module 44, and an ozone treatment module 45. The supply unit 46 may be referred to as a chlorine treatment module and is an example of a decolorization treatment module using a chemical treatment. The supply unit 46 is also an example of a decolorization treatment module using an advanced oxidation method, which is a type of chemical treatment.

[0074] The supply unit 46 supplies (adds) chlorine to the intermediate tank 41, for example. Specifically, the supply unit 46 includes a chlorine tank and a chlorine pump. The chlorine tank is a tank for storing hypochlorous acid water. The hypochlorous acid water is generated, for example, by dissolving hypochlorous acid tablets in water supplied to the chlorine tank. Alternatively, the hypochlorous acid water may be generated by dissolving salt in water supplied to the chlorine tank and electrolyzing the saline solution. Note that an electrolysis unit that electrolyzes saline solution to generate hypochlorous acid water may be separately provided downstream of the chlorine tank. Alternatively, the supply unit 46 may add hydrogen peroxide water.

[0075] The chlorine pump is disposed downstream of the chlorine tank. The chlorine pump is operated under the control of the control unit 50, and adds hypochlorous acid water stored in the chlorine tank to the water stored in the intermediate tank 41. This allows the supply unit 46 to supply hypochlorous acid water to the intermediate tank 41 in an amount and at a timing controlled by the control unit 50, for example, to decolorize iron contained in the water. Furthermore, the supply unit 46 can decolorize the water with chlorine, for example, as a final step in the water quality treatment.

[0076] The control unit 50 controls the supply unit 46 at a predetermined timing to cause the supply unit 46 to supply hypochlorous acid water to the intermediate tank 41. The predetermined timing is, for example, as follows. During the decolorization process by the filtration module 44, when a predetermined measurement (color, water level, etc.) is performed When a predetermined time has elapsed during the decolorization process by the filtration module 44 When a predetermined measurement is performed during decolorization treatment using the ozone treatment module 45 When the specified time is reached during decolorization treatment by the ozone treatment module 45 When the specified bleaching process is completed When the residual chlorine concentration in the treated water storage tank 30 reaches a predetermined value

[0077] The control unit 50 controls the supply unit 46 to supply a predetermined amount of hypochlorous acid water to the intermediate tank 41. The predetermined amount is, for example, as follows. Pre-set amount Amount calculated based on the residual chlorine concentration in the treated water storage tank 30 Amount calculated based on sensing value

[0078] The specific operation of the control unit 50 will be described with reference to Fig. 3. In step S11 shown in Fig. 3, the control unit 50 opens a valve to supply water treated in the biological treatment tank 20 to the intermediate tank 41. When the water in the intermediate tank 41 exceeds a predetermined value, the control unit 50 opens the solenoid valve 431 and closes the solenoid valves 432 and 433 to circulate the water flowing into the intermediate tank 41 between the ozone treatment module 45 and the intermediate tank 41. When the water in the intermediate tank 41 exceeds the predetermined value, the control unit 50 drives the chlorine pump to add a preset first amount of hypochlorous acid water to the intermediate tank 41.

[0079] In step S14, the control unit 50 determines whether or not the requirements for terminating the decolorization treatment by the filtration module 44 have been met. If the requirements for terminating the decolorization treatment by the filtration module 44 have been met, before performing the process of step S15, the control unit 50 drives the chlorine pump to add a preset second amount of hypochlorous acid water to the intermediate tank 41. The second amount is, for example, less than the first amount.

[0080] 9.2. Modification 2 of the Decolorization Processing Unit 40 FIG. 5 is a block diagram showing an example of the configuration of the decolorization treatment unit 40. The decolorization treatment unit 40 performs decolorization treatment on water supplied from the biological treatment tank 20. Specifically, the decolorization treatment unit 40 performs, for example, decolorization treatment using a filtration module 44, decolorization treatment using an ozone treatment module 45, and decolorization treatment using a UV sterilization unit 47 on the water supplied from the biological treatment tank 20. The decolorization treatment unit 40 shown in FIG. 4 includes an intermediate tank 41, a sensor 42, a UV sterilization unit 47, solenoid valves 431 to 433, a filtration module 44, and an ozone treatment module 45. The UV sterilization unit 47 may be referred to as a UV treatment module and is an example of a decolorization treatment module using a chemical treatment. The ozone treatment module 45 is an example of a decolorization treatment module using an advanced oxidation method, among chemical treatments.

[0081] The UV sterilization unit 47 is disposed between the intermediate tank 41 and the sensor 42. The UV sterilization unit 47 irradiates the water discharged from the intermediate tank 41 with ultraviolet light to sterilize the water. The water that has passed through the UV sterilization unit 47 passes through the sensor 42. The UV sterilization unit 47 is operated under the control of the control unit 50, and by irradiating the water discharged from the intermediate tank 41 with ultraviolet light, it is possible to decolorize the water with ultraviolet light, for example, as the final step in water quality treatment.

[0082] At a predetermined timing, the control unit 50 controls the UV sterilization unit 47 to irradiate ultraviolet light from the UV sterilization unit 47. The predetermined timing is, for example, as follows. When a predetermined measurement is performed during the decolorization process by the filtration module 44 When a predetermined time has elapsed during the decolorization process by the filtration module 44 When a predetermined measurement is performed during decolorization treatment using the ozone treatment module 45 When the specified time is reached during decolorization treatment by the ozone treatment module 45 When the specified bleaching process is completed

[0083] The control unit 50 controls the UV sterilization unit 47 to irradiate with ultraviolet light for a predetermined time. The predetermined time is, for example, as follows. Pre-set time Amount calculated based on sensing value

[0084] The specific operation of the control unit 50 will be described with reference to FIG. 3. In step S11 shown in FIG. 3, the control unit 50 opens a valve to supply water treated in the biological treatment tank 20 to the intermediate tank 41. When the water in the intermediate tank 41 exceeds a predetermined value, the control unit 50 opens the solenoid valve 431 and closes the solenoid valves 432 and 433 to circulate the water flowing into the intermediate tank 41 between the ozone treatment module 45 and the intermediate tank 41. The control unit 50 controls, for example, the opening and closing speed of the solenoid valve 431 so that the flow rate of the circulated water becomes a predetermined value. When the water in the intermediate tank 41 exceeds the predetermined value, the control unit 50 activates the UV lamp to irradiate ultraviolet light onto the water discharged from the intermediate tank 41. The control unit 50 turns off the UV lamp when a preset time has elapsed since the UV lamp was activated.

[0085] In step S15, the control unit 50 sends the water for which the decolorization process has been completed to the treated water storage tank 30. Specifically, the control unit 50 opens the solenoid valve 433, closes the solenoid valves 431 and 432, and sends the water stored in the intermediate tank 41 to the treated water storage tank 30. After controlling the valve group 43, the control unit 50 drives the UV lamp to irradiate ultraviolet rays onto the water sent from the intermediate tank 41. When a predetermined time has elapsed since the UV lamp was driven, the control unit 50 stops the UV lamp.

[0086] 9.3. Third Modification of the Decolorization Processing Unit 40 6 is a block diagram showing an example of the configuration of the decolorization treatment unit 40. The decolorization treatment unit 40 performs decolorization treatment on water supplied from the biological treatment tank 20. Specifically, the decolorization treatment unit 40 does not include, for example, an intermediate tank 41, and does not store water supplied from the biological treatment tank 20, but performs decolorization treatment continuously. The decolorization treatment unit 40 shown in FIG. 6 includes a backflow valve 49, an electromagnetic valve 48, a sensor 42, electromagnetic valves 431 to 433, a filtration module 44, and an ozone treatment module 45.

[0087] The backflow valve 49 is installed in the flow path leading to the biological treatment tank 20. Water supplied from the biological treatment tank 20 is supplied to the sensor 42 via the backflow valve 49. The backflow valve 49 prevents water from flowing back from the decolorization treatment unit 40 to the biological treatment tank 20.

[0088] The opening and closing of the solenoid valve 48 is controlled by instructions from the control unit 50. The solenoid valve 48 is connected to a flow path leading to the sensor 42, a flow path leading to the filtration module 44, and a flow path leading to the ozone treatment module 45. For example, in response to instructions from the control unit 50, the solenoid valve 48 opens or closes the flow path leading to the sensor 42, the flow path leading to the filtration module 44, and the flow path leading to the ozone treatment module 45.

[0089] The control unit 50 controls, for example, the pump, the electromagnetic valves 431 to 433, and the electromagnetic valve 48 so as to supply water to the set decolorization treatment module.

[0090] Specifically, for example, when supplying water to the filtration module 44, the control unit 50 instructs the solenoid valve 48 to open the flow path leading to the sensor 42 and the flow path leading to the filtration module 44 and close the flow path leading to the ozone treatment module 45. The control unit 50 also instructs the solenoid valve 432 to open and the solenoid valves 431 and 433 to close. The control unit 50 also controls the pump to supply water to the filtration module 44 at a predetermined flow rate. The control unit 50 may control the flow rate by adjusting the opening degree or opening / closing speed of the solenoid valves 48 and 432. The control unit 50 controls the pump, the solenoid valves 431 to 433, and the solenoid valve 48 to maintain the supply of water to the filtration module 44 until the sensing value reaches a predetermined value. The control unit 50 also controls the pump, the solenoid valves 431 to 433, and the solenoid valve 48 to maintain the supply of water to the filtration module 44 until the maximum treatment time has elapsed, even if the sensing value does not reach the predetermined value. Furthermore, the control unit 50 controls the pump, the solenoid valves 431 to 433, and the solenoid valve 48 so as to maintain the supply of water to the filtration module 44 for at least the minimum treatment time. The control unit 50 may, for example, combine at least two of these control requirements.

[0091] Furthermore, for example, when supplying water to the ozone treatment module 45, the control unit 50 instructs the solenoid valve 48 to open the flow path leading to the sensor 42 and the flow path leading to the ozone treatment module 45 and to close the flow path leading to the filtration module 44. The control unit 50 also instructs the solenoid valve 431 to open and the solenoid valves 432 and 433 to close. The control unit 50 also controls the pump to supply water to the ozone treatment module 45 at a predetermined flow rate. The control unit 50 may control the flow rate by adjusting the opening degree or opening / closing speed of the solenoid valves 48 and 431. For example, the control unit 50 controls the pump, the solenoid valves 431 to 433, and the solenoid valve 48 to maintain the supply of water to the ozone treatment module 45 until the sensing value reaches a predetermined value. Furthermore, the control unit 50 controls the pump, the solenoid valves 431-433, and the solenoid valve 48 to maintain the supply of water to the ozone treatment module 45 until the maximum treatment time has elapsed, even if the sensing value has not reached a predetermined value. Furthermore, the control unit 50 controls the pump, the solenoid valves 431-433, and the solenoid valve 48 to maintain the supply of water to the ozone treatment module 45 for at least the minimum treatment time. The control unit 50 may combine at least two of these control requirements, for example.

[0092] Furthermore, for example, when supplying water to a flow path leading to the treated water storage tank 30, the control unit 50 instructs the solenoid valve 48 to open the flow path leading to the sensor 42 and the flow path leading to one of the modules that was performing treatment immediately before, and to close the flow path leading to the other module. The control unit 50 also instructs the solenoid valve 433 to open and the solenoid valves 431 and 432 to close. The control unit 50 also controls the pump to send water to the treated water storage tank 30 at a predetermined flow rate. The control unit 50 may also control the flow rate by adjusting the opening degree or opening / closing speed of the solenoid valves 48 and 433. When the decolorization treatment using the filtration module 44 and the ozone treatment module 45 is completed, the control unit 50 controls the pump, the solenoid valves 431 to 433, and the solenoid valve 48 to discharge water into the treated water storage tank 30.

[0093] The specific operation of the control unit 50 will be described with reference to FIG. 3. In step S11 shown in FIG. 3, the control unit 50 causes the decolorization treatment unit 40 to perform decolorization treatment using the ozone treatment module 45. Specifically, the control unit 50 instructs the solenoid valve 48 to open the flow path leading to the sensor 42 and the flow path leading to the ozone treatment module 45 and to close the flow path leading to the filtration module 44. The control unit 50 also instructs the solenoid valve 431 to open and the solenoid valves 432 and 433 to close. In this way, the control unit 50 circulates the water treated in the biological treatment tank 20 so that it is continuously treated in the ozone treatment module 45. The control unit 50 controls, for example, the opening and closing speeds of the solenoid valves 48 and 431 so that the flow rate of the circulating water becomes a predetermined value.

[0094] In step S13, the control unit 50 causes the decolorization treatment unit 40 to perform decolorization treatment using the filtration module 44. Specifically, the control unit 50 instructs the solenoid valve 48 to open the flow path leading to the sensor 42 and the flow path leading to the filtration module 44 and to close the flow path leading to the ozone treatment module 45. The control unit 50 also instructs the solenoid valve 432 to open and the solenoid valves 431 and 433 to close. As a result, the control unit 50 circulates the water treated in the biological treatment tank 20 and the water treated in the ozone treatment module 45 so that they are continuously treated in the filtration module 44. The control unit 50 controls, for example, the opening and closing speeds of the solenoid valves 48 and 432 so that the flow rate of the circulated water becomes a predetermined value.

[0095] In step S15, the control unit 50 sends the water for which the decolorization treatment has been completed to the treated water storage tank 30. Specifically, the control unit 50 instructs the solenoid valve 48 to open the flow path leading to the sensor 42 and the flow path leading to the filtration module 44, and to close the flow path leading to the ozone treatment module 45. The control unit 50 also opens the solenoid valve 433 and closes the solenoid valves 431 and 432, and sends the water treated in the filtration module 44 to the treated water storage tank 30. The control unit 50 may close the valve installed between the biological treatment tank 20 and the decolorization treatment unit 40 while the water is being sent to the treated water storage tank 30.

[0096] The control unit 50 may determine whether to perform a bleaching process in the filtration module 44 or in the ozone treatment module 45, depending on the sensing value of the sensor 42. For example, if the sensing value is equal to or greater than a predetermined value, the control unit 50 performs a bleaching process in the ozone treatment module 45 for a predetermined time, and then performs a bleaching process in the filtration module 44 for a predetermined time. If the sensing value does not become less than the predetermined value after the bleaching process in the filtration module 44 for the predetermined time, the control unit 50 may perform a bleaching process in the ozone treatment module 45 again. Furthermore, if the sensing value is less than the predetermined value, for example, the control unit 50 does not perform a bleaching process in the ozone treatment module 45 for a predetermined time, but performs a bleaching process in the filtration module 44 for a predetermined time.

[0097] 9.4. Fourth Modification of the Decolorization Processing Unit 40 FIG. 7 is a block diagram showing an example of the configuration of the decolorization treatment unit 40. The decolorization treatment unit 40 performs decolorization treatment on water supplied from the biological treatment tank 20. Specifically, the decolorization treatment unit 40 does not include, for example, an intermediate tank 41, and does not store water supplied from the biological treatment tank 20, but performs decolorization treatment continuously. The decolorization treatment unit 40 also performs decolorization treatment on water stored in the treated water storage tank 30. The decolorization treatment unit 40 shown in FIG. 7 includes a check valve 49, a check valve 410, a solenoid valve 48, a sensor 42, solenoid valves 431 to 433, a filtration module 44, and an ozone treatment module 45. The decolorization treatment unit 40 is connected to a first flow path that delivers water to the treated water storage tank 30 and a second flow path that delivers water stored in the treated water storage tank 30 to the decolorization treatment unit 40. Pumps, for example, are installed in both the first and second flow paths.

[0098] The backflow valve 410 is installed in a flow path connecting the sensor 42 and the valve group 43. Water that has passed through the sensor 42 is supplied to the valve group 43 via the backflow valve 410. The backflow valve 410 prevents water from flowing back from the valve group 43 to the sensor 42.

[0099] The control unit 50 controls, for example, the pump, the electromagnetic valves 431 to 433, and the electromagnetic valve 48 so as to supply water to the set decolorization treatment module.

[0100] Specifically, for example, when water stored in the treated water storage tank 30 is to be supplied to the filtration module 44, the control unit 50 instructs the solenoid valve 48 to open the flow path leading to the sensor 42 and the flow path leading to the filtration module 44 and to close the flow path leading to the ozone treatment module 45. The control unit 50 also instructs the solenoid valve 432 to open and the solenoid valves 431 and 433 to close. The control unit 50 also controls the pump to supply water to the filtration module 44 at a predetermined flow rate. The control unit 50 may control the flow rate by adjusting the opening degree or opening / closing speed of the solenoid valves 48 and 432. For example, the control unit 50 controls the pump, the solenoid valves 431 to 433, and the solenoid valve 48 to maintain the supply of water to the filtration module 44 until the sensing value reaches a predetermined value. Furthermore, the control unit 50 controls the pump, the solenoid valves 431-433, and the solenoid valve 48 to maintain the supply of water to the filtration module 44 until the maximum treatment time has elapsed, even if the sensing value has not reached a predetermined value. Furthermore, the control unit 50 controls the pump, the solenoid valves 431-433, and the solenoid valve 48 to maintain the supply of water to the filtration module 44 for at least the minimum treatment time. The control unit 50 may combine at least two of these control requirements, for example.

[0101] Furthermore, for example, when water stored in the treated water storage tank 30 is supplied to the ozone treatment module 45, the control unit 50 instructs the solenoid valve 48 to open the flow path leading to the sensor 42 and the flow path leading to the ozone treatment module 45 and to close the flow path leading to the filtration module 44. The control unit 50 also instructs the solenoid valve 431 to open and the solenoid valves 432 and 433 to close. The control unit 50 also controls the pump to supply water to the ozone treatment module 45 at a predetermined flow rate. The control unit 50 may control the flow rate by adjusting the opening degree or opening / closing speed of the solenoid valves 48 and 431. The control unit 50 controls the pump, the solenoid valves 431 to 433, and the solenoid valve 48 to maintain the supply of water to the ozone treatment module 45 until the sensing value reaches a predetermined value. Furthermore, the control unit 50 controls the pump, the solenoid valves 431-433, and the solenoid valve 48 to maintain the supply of water to the ozone treatment module 45 until the maximum treatment time has elapsed, even if the sensing value has not reached a predetermined value. Furthermore, the control unit 50 controls the pump, the solenoid valves 431-433, and the solenoid valve 48 to maintain the supply of water to the ozone treatment module 45 for at least the minimum treatment time. The control unit 50 may combine at least two of these control requirements, for example.

[0102] Furthermore, for example, when supplying water to a flow path leading to the treated water storage tank 30, the control unit 50 instructs the solenoid valve 48 to open the flow path leading to the sensor 42 and the flow path leading to one of the modules that was performing treatment immediately before, and to close the flow path leading to the other module. The control unit 50 also instructs the solenoid valve 433 to open and the solenoid valves 431 and 432 to close. The control unit 50 also controls the pump to send water to the treated water storage tank 30 at a predetermined flow rate. The control unit 50 may also control the flow rate by adjusting the opening degree or opening / closing speed of the solenoid valves 48 and 433. When the decolorization treatment using the filtration module 44 and the ozone treatment module 45 is completed, the control unit 50 controls the pump, the solenoid valves 431 to 433, and the solenoid valve 48 to discharge water into the treated water storage tank 30.

[0103] The specific operation of the control unit 50 when performing a decolorization treatment on the water stored in the treated water storage tank 30 will be described with reference to FIG. 3. In step S11 shown in FIG. 3, the control unit 50 causes the decolorization treatment unit 40 to perform a decolorization treatment using the ozone treatment module 45. Specifically, the control unit 50 closes the valves installed between the decolorization treatment unit 40 and the biological treatment tank 20. The control unit 50 instructs the solenoid valve 48 to open the flow path leading to the sensor 42 and the flow path leading to the ozone treatment module 45 and to close the flow path leading to the filtration module 44. The control unit 50 instructs the solenoid valve 431 to open and the solenoid valves 432 and 433 to close. As a result, the control unit 50 circulates the water stored in the treated water storage tank 30 so that it is continuously treated by the ozone treatment module 45. The control unit 50 controls, for example, the opening and closing speeds of the solenoid valves 48 and 431 so that the flow rate of the circulated water becomes a predetermined value.

[0104] In step S13, the control unit 50 causes the decolorization treatment unit 40 to perform decolorization treatment using the filtration module 44. Specifically, the control unit 50 instructs the solenoid valve 48 to open the flow path leading to the sensor 42 and the flow path leading to the filtration module 44 and to close the flow path leading to the ozone treatment module 45. The control unit 50 also instructs the solenoid valve 432 to open and the solenoid valves 431 and 433 to close. As a result, the control unit 50 circulates the water treated in the biological treatment tank 20 and the water treated in the ozone treatment module 45 so that they are continuously treated in the filtration module 44. The control unit 50 controls, for example, the opening and closing speeds of the solenoid valves 48 and 432 so that the flow rate of the circulated water becomes a predetermined value.

[0105] In step S15, the control unit 50 sends the water for which the decolorization treatment has been completed to the treated water storage tank 30. Specifically, the control unit 50 instructs the solenoid valve 48 to open the flow path leading to the sensor 42 and the flow path leading to the filtration module 44, and to close the flow path leading to the ozone treatment module 45. The control unit 50 also opens the solenoid valve 433 and closes the solenoid valves 431 and 432, and sends the water treated in the filtration module 44 to the treated water storage tank 30. When the delivery of the water to the treated water storage tank 30 is completed, the control unit 50 opens the valve.

[0106] The control unit 50 may determine whether to perform decolorization treatment in the filtration module 44 or in the ozone treatment module 45, depending on the sensing value of a predetermined sensor installed in the treated water storage tank 30. For example, if the chromaticity is equal to or greater than a predetermined value, the control unit 50 performs decolorization treatment in the ozone treatment module 45 for a predetermined time, and then performs decolorization treatment in the filtration module 44 for a predetermined time. If the chromaticity does not become less than the predetermined value after the decolorization treatment in the filtration module 44 for the predetermined time, the control unit 50 may perform decolorization treatment in the ozone treatment module 45 again. Furthermore, if the chromaticity is less than the predetermined value, for example, the control unit 50 does not perform decolorization treatment in the ozone treatment module 45 for a predetermined time, but performs decolorization treatment in the filtration module 44 for a predetermined time.

[0107] <9.5. Control parameter settings> In the above embodiment, a case has been described in which the treatment time in the decolorization treatment module is set according to the level of the sensing value (chromaticity) acquired by the sensor 42. The treatment time in the decolorization treatment module is not limited to being based on sensing. The treatment time in the decolorization treatment module may be set, for example, based on the amount of treated water produced in the water treatment device 1. The amount of treated water produced in the water treatment device 1 may be determined, for example, from the water level of the treated water stored in the treated water storage tank 30, or may be determined by a flow meter installed in the decolorization treatment unit 40.

[0108] For example, the control unit 50 increases the treatment time in the decolorization treatment module when the water level measured by a water level gauge installed in the treated water storage tank 30 exceeds a predetermined value. If a sufficient amount of treated water is stored in the treated water storage tank 30, there is little need to urgently produce treated water. Therefore, decolorization of the water may be prioritized over production of treated water. The treatment time to be increased may be the time for decolorization treatment by the filtration module 44, the time for decolorization treatment by the ozone treatment module 45, or the time for both decolorization treatments.

[0109] Furthermore, for example, the control unit 50 increases the treatment time in the decolorization treatment module based on the water level measured by a water level gauge installed in the treated water storage tank 30 and the chromaticity measured by the sensor 42. Specifically, for example, when the water level in the treated water storage tank 30 exceeds a predetermined value and the chromaticity measured by the sensor 42 exceeds a predetermined value, the control unit 50 prioritizes decolorization over the production of treated water and increases the treatment time in the decolorization treatment module.

[0110] The treatment time in the decolorization treatment module may also be set based on, for example, water usage statistics. The water usage statistics indicate, for example, what a consumer uses treated water for at a given time on a given day. In other words, by referring to the water usage statistics, it is possible to understand how the treated water stored in the treated water storage tank 30 is used. If it is clear from the water usage statistics that water usage is low during a given time period, the control unit 50 increases the treatment time in the decolorization treatment module during that time period.

[0111] Furthermore, for example, the control unit 50 increases the treatment time in the decolorization treatment module based on the statistical values of water usage and the water level measured by a water level gauge installed in the treated water storage tank 30. Specifically, for example, if the water level in the treated water storage tank 30 exceeds a predetermined value when the water demand is below a predetermined value, the control unit 50 prioritizes decolorization over the production of treated water and increases the treatment time in the decolorization treatment module.

[0112] Furthermore, for example, the control unit 50 increases the treatment time in the decolorization treatment module based on the water usage statistics, the water level measured by a water level gauge installed in the treated water storage tank 30, and the chromaticity measured by the sensor 42. Specifically, for example, if the water level in the treated water storage tank 30 exceeds a predetermined value when the water demand is less than a predetermined value, and the chromaticity measured by the sensor 42 exceeds a predetermined value, the control unit 50 prioritizes decolorization over the production of treated water, and increases the treatment time in the decolorization treatment module.

[0113] Furthermore, for example, when the water demand is equal to or greater than a predetermined value but the water level in the treated water storage tank 30 is less than a predetermined value, and the chromaticity measured by the sensor 42 exceeds a predetermined value, that is, when there is a high need to quickly perform decolorization, the control unit 50 may extend the time for the decolorization treatment by the filtration module 44 and shorten the time for the decolorization treatment by the ozone treatment module 45. Because the decolorization treatment by the filtration module 44 reduces the chromaticity of water more quickly than the decolorization treatment by the ozone treatment module 45, it is possible to obtain decolorized water more quickly than usual.

[0114] Conversely, for example, when the water demand is below a predetermined value and the water level in the treated water storage tank 30 is equal to or greater than a predetermined value, if the chromaticity measured by the sensor 42 exceeds a predetermined value, i.e., if there is little need to urgently perform decolorization, the decolorization time by the ozone treatment module 45 may be extended and the decolorization time by the filtration module 44 may be shortened. This makes it possible to extend the life of the activated carbon in the filtration module 44.

[0115] Furthermore, the sensing value to be reached in the decolorization treatment module is not limited to one based on sensing. The sensing value to be reached may be set, for example, based on the amount of treated water generated by the water treatment device 1. For example, the control unit 50 lowers the sensing value to be reached when the water level measured by a water level gauge installed in the treated water storage tank 30 exceeds a predetermined value. When a sufficient amount of treated water is stored in the treated water storage tank 30, there is little need to urgently generate treated water. Therefore, the priority of decolorization of water may be increased over the generation of treated water. The sensing value to be reached may be lowered for the decolorization treatment by the filtration module 44, the decolorization treatment by the ozone treatment module 45, or both.

[0116] Furthermore, for example, the control unit 50 lowers the sensing value that should be reached in the decolorization treatment module based on the water level measured by a water level gauge installed in the treated water storage tank 30 and the chromaticity measured by the sensor 42. Specifically, for example, when the water level in the treated water storage tank 30 exceeds a predetermined value and the chromaticity measured by the sensor 42 exceeds a predetermined value, the control unit 50 prioritizes the decolorization treatment over the production of treated water and lowers the sensing value that should be reached in the decolorization treatment module.

[0117] The sensing value to be reached in the bleaching treatment module may also be set based on, for example, statistical values of water usage. If it is clear from the statistical values of water usage that water usage is low during a certain time period, the control unit 50 lowers the sensing value to be reached in the bleaching treatment module during that time period.

[0118] Furthermore, for example, the control unit 50 lowers the sensing value that should be reached in the decolorization treatment module based on the statistical value of water usage and the water level measured by a water level gauge installed in the treated water storage tank 30. Specifically, for example, if the water level in the treated water storage tank 30 exceeds a predetermined value when the water demand is below a predetermined value, the control unit 50 prioritizes decolorization over the production of treated water and lowers the sensing value that should be reached in the decolorization treatment module.

[0119] Furthermore, for example, the control unit 50 lowers the sensing value that should be reached in the decolorization treatment module based on the water usage statistics, the water level measured by a water level gauge installed in the treated water storage tank 30, and the chromaticity measured by the sensor 42. Specifically, for example, if the water level in the treated water storage tank 30 exceeds a predetermined value when the water demand is less than a predetermined value and the chromaticity measured by the sensor 42 exceeds a predetermined value, the control unit 50 prioritizes decolorization over the production of treated water and lowers the sensing value that should be reached in the decolorization treatment module.

[0120] Furthermore, for example, when the water demand is equal to or greater than a predetermined value but the water level in the treated water storage tank 30 is below a predetermined value, and the chromaticity measured by the sensor 42 exceeds a predetermined value, that is, when there is a high need to quickly perform decolorization, the control unit 50 may raise the threshold for the decolorization treatment by the ozone treatment module 45 and quickly switch to the decolorization treatment by the filtration module 44. The decolorization treatment by the filtration module 44 reduces the chromaticity of water more quickly than the decolorization treatment by the ozone treatment module 45, so it is possible to obtain decolorized water more quickly than usual.

[0121] Conversely, for example, when the water demand is below a predetermined value and the water level in the treated water storage tank 30 is equal to or greater than a predetermined value, if the chromaticity measured by the sensor 42 exceeds a predetermined value, i.e., if there is little need to urgently perform decolorization, the threshold for decolorization treatment by the ozone treatment module 45 may be lowered to delay the transition to decolorization treatment by the filtration module 44. This makes it possible to extend the life of the activated carbon in the filtration module 44.

[0122] <9.6. Use of Sensing Values> The activated carbon filter included in the filtration module 44 needs to be replaced depending on the number of times it is used. By monitoring the sensed value by the sensor 42, the control unit 50 can grasp the effectiveness of the decolorization process from the sensed value. By monitoring the transition of the sensed value by the sensor 42, the control unit 50 may be configured to issue a notification that it is time to replace the activated carbon filter if it detects a deviation from the sensed value when the activated carbon filter is operating normally. In other words, the control unit 50 can indicate when it is time to perform maintenance on the filtration module 44.

[0123] <9.7. Other Modifications> In the above embodiment, the filtration module 44 is described as an example of one type, but the filtration module 44 of the decolorization processing unit 40 according to this embodiment is not limited to one type. The decolorization processing unit 40 may have multiple types of filtration modules equipped with different types of filters. In this case, the control unit 50 determines, for example, which type of filtration module to use for processing, based on the installed filters. The control unit 50 also determines, for example, the order in which the filtration modules should be used for processing, based on the installed filters. In the decolorization processing unit 40, water is supplied to the multiple types of filtration modules via, for example, valves controlled by the control unit 50.

[0124] In the above embodiment, the ozone treatment module 45 is described as an example of one type. However, the ozone treatment module 45 included in the decolorization processing unit 40 according to this embodiment is not limited to one type. The decolorization processing unit 40 may include multiple types of ozone treatment modules with different types of methods. In this case, the control unit 50 determines, for example, which type of ozone treatment module to use for treatment, based on the effect of the ozone treatment. The control unit 50 also determines, for example, the order in which the ozone treatment modules should be used for treatment, based on the effect of the ozone treatment. In the decolorization processing unit 40, water is supplied to the multiple types of ozone treatment modules via valves controlled by the control unit 50.

[0125] In the above embodiment, a case has been described in which treatment by the ozone treatment module 45 is followed by treatment by the filtration module 44. The combination of decolorization treatment modules, the treatment time, and the sensing value to be achieved may differ depending on the target water. For example, the combination of decolorization treatment modules, the treatment time, and the sensing value to be achieved may differ depending on whether the water is used for toilet flushing, bathing, showering, laundry, dishwashing, etc. In this case, default settings may be determined depending on the target water.

[0126] <Basic computer hardware configuration> 8 is a block diagram showing the basic hardware configuration of a computer 90. The computer 90 includes at least a processor 901, a main memory device 902, an auxiliary memory device 903, and a communication IF 991 (interface), which are electrically connected to one another by a communication bus 921.

[0127] The processor 901 is hardware for executing an instruction set written in a program, and is composed of an arithmetic unit, registers, peripheral circuits, and the like.

[0128] The main storage device 902 is for temporarily storing programs, data to be processed by the programs, etc. For example, it is a volatile memory such as a DRAM (Dynamic Random Access Memory).

[0129] The auxiliary storage device 903 is a storage device for saving data and programs, such as a flash memory, a hard disk drive (HDD), a magneto-optical disk, a CD-ROM, a DVD-ROM, or a semiconductor memory.

[0130] The communication IF 991 is an interface for inputting and outputting signals for communicating with other computers via a network using wired or wireless communication standards. The network is composed of the Internet, a LAN, various mobile communication systems constructed by wireless base stations, etc. For example, the network includes 3G, 4G, and 5G mobile communication systems, LTE (Long Term Evolution), and wireless networks (e.g., Wi-Fi (registered trademark)) that can connect to the Internet via a predetermined access point. In the case of a wireless connection, communication protocols include, for example, Z-Wave (registered trademark), ZigBee (registered trademark), and Bluetooth (registered trademark). In the case of a wired connection, the network also includes a direct connection using a USB (Universal Serial Bus) cable, etc.

[0131] It should be noted that the computer 90 can be virtually realized by distributing all or part of each hardware configuration across multiple computers 90 and interconnecting them via a network. In this way, the computer 90 is a concept that includes not only a computer 90 housed in a single housing or case, but also a virtualized computer system.

[0132] <Basic functional configuration of computer 90> The following describes the functional configuration of a computer realized by the basic hardware configuration (FIG. 8) of the computer 90. The computer includes at least the functional units of a control unit, a storage unit, and a communication unit.

[0133] The functional units of the computer 90 can also be realized by distributing all or part of the functional units among multiple computers 90 interconnected via a network. The computer 90 is a concept that includes not only a single computer 90 but also a virtualized computer system.

[0134] The control unit is realized by the processor 901 reading out various programs stored in the auxiliary storage device 903, expanding them in the main storage device 902, and executing processing in accordance with the programs. The control unit can realize functional units that perform various types of information processing depending on the type of program. In this way, the computer is realized as an information processing device that performs information processing.

[0135] The storage unit is realized by a main storage device 902 and an auxiliary storage device 903. The storage unit stores data, various programs, and various databases. Furthermore, the processor 901 can allocate a storage area corresponding to the storage unit in the main storage device 902 or the auxiliary storage device 903 in accordance with the programs. Furthermore, the control unit can cause the processor 901 to execute processes for adding, updating, and deleting data stored in the storage unit in accordance with the various programs.

[0136] A database refers to a relational database, which manages data sets called masters and tables in a tabular format structurally defined by rows and columns, by relating them to each other. In a database, a table is called a table, a master, a column in a table is called a column, and a row in a table is called a record. In a relational database, relationships between tables and masters can be set and associated. Typically, each table and each master has a column set as a primary key to uniquely identify a record, but setting a primary key to a column is not essential. The control unit can cause the processor 901 to add, delete, or update records in specific tables and masters stored in the storage unit according to various programs. Furthermore, by storing data, various programs, and various databases in the storage unit, it can be considered that the information processing device and information processing system according to the present disclosure have been manufactured.

[0137] Note that the databases and masters in this disclosure may include any data structure in which information is structurally defined (such as a list, dictionary, associative array, or object). The data structure also includes data that can be considered as a data structure by combining data with functions, classes, methods, etc. written in any programming language.

[0138] The communication unit is realized by the communication IF 991. The communication unit realizes a function of communicating with other computers 90 via a network. The communication unit can receive information transmitted from other computers 90 and input the information to the control unit. The control unit can cause the processor 901 to execute information processing on the received information in accordance with various programs. In addition, the communication unit can transmit information output from the control unit to other computers 90.

[0139] Furthermore, the above-described configurations, functions, processing units, processing means, etc. may be partially or entirely implemented in hardware, for example, by designing them as integrated circuits. The present invention can also be realized by software program code that implements the functions of the embodiments. In this case, a storage medium on which the program code is recorded is provided to a computer, and a processor included in the computer reads the program code stored in the storage medium. In this case, the program code itself read from the storage medium implements the functions of the above-described embodiments, and the program code itself and the storage medium on which it is stored constitute the present invention. Examples of storage media for providing such program code include flexible disks, CD-ROMs, DVD-ROMs, hard disks, SSDs, optical disks, magneto-optical disks, CD-Rs, magnetic tape, non-volatile memory cards, and ROMs.

[0140] Furthermore, the program code that realizes the functions described in this embodiment can be implemented in a wide range of program or script languages, such as assembler, C / C++, perl, Shell, PHP, and Java (registered trademark).

[0141] Furthermore, the program code of the software that realizes the functions of the embodiments may be distributed via a network and stored in a storage means such as a computer's hard disk or memory, or in a storage medium such as a CD-RW or CD-R, and the processor of the computer may read and execute the program code stored in the storage means or storage medium.

[0142] The functions performed by the components described herein may be implemented in circuitry or processing circuitry, including general-purpose processors, application-specific processors, integrated circuits, ASICs (Application Specific Integrated Circuits), a CPU (a Central Processing Unit), conventional circuits, and / or combinations thereof, programmed to perform the described functions. A processor includes transistors and other circuits and is considered to be circuitry or processing circuitry. A processor may also be a programmed processor that executes programs stored in memory. In this specification, a circuitry, unit, or means is hardware that is programmed to realize or performs the described functions, which may be any hardware disclosed herein or any hardware known to be programmed to realize or perform the described functions. If the hardware is a processor considered to be a type of circuitry, the circuitry, means, or unit is a combination of the hardware and software used to configure the hardware and / or processor.

[0143] Although several embodiments of the present disclosure have been described above, these embodiments can be embodied in various other forms, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. These embodiments and modifications are intended to be included in the scope of the inventions and their equivalents as defined in the claims, as well as in the scope and spirit of the inventions.

[0144] (Addendum) The matters described in the above embodiments will be supplemented below.

[0145] (Appendix 1) A water treatment device comprising: a sensor that measures the water quality of the water passing through; a valve that selectively sends the water whose quality has been measured to a first flow path, a second flow path, or a third flow path; a chemical treatment module that performs chemical treatment on the water supplied from the first flow path; a physical treatment module that performs physical treatment on the water supplied from the second flow path; and a control unit that controls the opening and closing of the valve based on the sensing results of the sensor, and performs treatment in at least one of the chemical treatment module and the physical treatment module for a predetermined period of time, and then sends the water out from the third flow path. (Appendix 2) The water treatment device according to claim 1, wherein the control unit performs circulation in at least one of the chemical treatment module and the physical treatment module based on a sensing result from the sensor. (Appendix 3) The water treatment device according to (Supplementary Note 1) or (Supplementary Note 2), wherein the chemical treatment module is a treatment module that utilizes an advanced oxidation method. (Appendix 4) The water treatment device according to any one of (Supplementary Note 1) to (Supplementary Note 3), wherein there are a plurality of types of chemical treatment modules and a plurality of types of physical treatment modules. (Appendix 5) A water treatment device described in any one of (Appendix 1) to (Appendix 4), wherein the control unit sets the treatment time using the chemical treatment module, the treatment time using the physical treatment module, or the treatment time using both of these, depending on the amount of treated water, the sensing results from the sensor, or a combination of these. (Appendix 6) The water treatment device according to claim 5, wherein the control unit sets the treatment time using the chemical treatment module, the treatment time using the physical treatment module, or the treatment time using both of these modules, also in accordance with statistical values of water usage. (Appendix 7) The control unit sets a threshold value for the sensing result in the chemical treatment module, a threshold value for the sensing result in the physical treatment module, or a threshold value for the sensing result in both of these, depending on the amount of treated water, the sensing result by the sensor, or a combination thereof (water treatment device described in Appendix 5). (Appendix 8) The control unit sets the processing time using the chemical treatment module, the processing time using the physical treatment module, or the processing time using both of these, also based on the statistical values of water usage, and sets a threshold value for the sensing results in the chemical treatment module, a threshold value for the sensing results in the physical treatment module, or a threshold value for the sensing results in both of these (water treatment device described in Appendix 7). (Appendix 9) The water treatment device according to any one of (Supplementary Note 1) to (Supplementary Note 8), wherein the control unit indicates a timing for maintenance of the physical treatment module based on a transition of a sensing result by the sensor. (Appendix 10) A program executed in a water treatment device having a processor and a memory, the water treatment device having a sensor that measures the water quality of water passing through, a valve that selectively sends the water whose quality has been measured to a first flow path, a second flow path, or a third flow path, a chemical treatment module that performs chemical treatment on the water supplied from the first flow path, and a physical treatment module that performs physical treatment on the water supplied from the second flow path, the program causing the processor to control the opening and closing of the valve based on the treatment time in the chemical treatment module, the treatment time in the physical treatment module, and sensing results from the sensor, and to execute a step of sending water from the third flow path after performing treatment in at least one of the chemical treatment module and the physical treatment module. (Appendix 11) A method performed by a water treatment device having a processor and memory, the water treatment device having a sensor that measures the water quality of water passing through, a valve that selectively sends the water whose quality has been measured to a first flow path, a second flow path, or a third flow path, a chemical treatment module that performs chemical treatment on the water supplied from the first flow path, and a physical treatment module that performs physical treatment on the water supplied from the second flow path, the processor controls the opening and closing of the valve based on the treatment time in the chemical treatment module, the treatment time in the physical treatment module, and the sensing results of the sensor, and performs a step of sending out the water from the third flow path after performing treatment in at least one of the chemical treatment module and the physical treatment module. (Appendix 12) A system comprising: a sensor that measures the water quality of the water passing through; a valve that selectively sends the water whose quality has been measured to a first flow path, a second flow path, or a third flow path; a chemical treatment module that performs chemical treatment on the water supplied from the first flow path; a physical treatment module that performs physical treatment on the water supplied from the second flow path; and a control unit that controls the opening and closing of the valve based on the treatment time in the chemical module, the treatment time in the physical treatment module, and the sensing results of the sensor, and sends the water out from the third flow path after treatment in at least one of the chemical treatment module and the physical treatment module. [Explanation of symbols]

[0146] 1...Water treatment equipment 10…Drainage adjustment tank 20...Biological treatment tank 30...Treated water storage tank 40...Decolorization processing section 50...Control unit 100...Circulating toilet

Claims

1. a sensor for measuring the quality of the water passing through; a valve that selectively sends the water whose quality has been measured to the first flow path, the second flow path, or the third flow path; a chemical treatment module that performs decolorization by chemical treatment on the water supplied from the first flow path; a physical treatment module that performs decolorization by physical treatment on the water supplied from the second flow path; a control unit that controls opening and closing of the valve based on the sensing result of the sensor, and sends out water from the third flow path after performing treatment in at least one of the chemical treatment module and the physical treatment module for a predetermined time; A water treatment device comprising:

2. The water treatment device according to claim 1 , wherein the control unit carries out circulation in at least one of the chemical treatment module and the physical treatment module based on the sensing result of the sensor.

3. 2. The water treatment device according to claim 1, wherein the chemical treatment module is a treatment module that utilizes an advanced oxidation process.

4. The water treatment device according to claim 1 , wherein there are a plurality of types of the chemical treatment module and a plurality of types of the physical treatment module.

5. The water treatment device according to claim 1, wherein the control unit sets the treatment time using the chemical treatment module, the treatment time using the physical treatment module, or the treatment time using both of these, depending on the amount of treated water, the sensing results by the sensor, or a combination of these.

6. The water treatment device according to claim 5 , wherein the control unit sets the treatment time by the chemical treatment module, the treatment time by the physical treatment module, or the treatment time using both of them, also in accordance with a statistical value of water usage.

7. The water treatment device described in claim 5, wherein the control unit sets a threshold value for the sensing result in the chemical treatment module, a threshold value for the sensing result in the physical treatment module, or a threshold value for the sensing result in both of these, depending on the amount of treated water, the sensing result by the sensor, or a combination thereof.

8. The water treatment device described in claim 7, wherein the control unit sets the treatment time using the chemical treatment module, the treatment time using the physical treatment module, or a treatment time using both of these, also based on water usage statistics, and sets a threshold value for the sensing result in the chemical treatment module, a threshold value for the sensing result in the physical treatment module, or a threshold value for the sensing result in both of these.

9. The water treatment device according to claim 1 , wherein the control unit indicates a maintenance timing for the physical treatment module based on a transition of the sensing result by the sensor.

10. A program executed in a water treatment device having a processor and a memory, The water treatment device comprises: a sensor for measuring the quality of the water passing through; a valve that selectively sends the water whose quality has been measured to the first flow path, the second flow path, or the third flow path; a chemical treatment module that performs decolorization by chemical treatment on the water supplied from the first flow path; a physical treatment module that performs decolorization by physical treatment on the water supplied from the second flow path; Equipped with The program causes the processor to: A program that controls the opening and closing of the valve based on the sensing results of the sensor, and executes a step of discharging water from the third flow path after performing processing in at least one of the chemical treatment module and the physical treatment module for a predetermined period of time.

11. 1. A method performed by a water treatment device comprising a processor and a memory, the method comprising: The water treatment device comprises: a sensor for measuring the quality of the water passing through; a valve that selectively sends the water whose quality has been measured to the first flow path, the second flow path, or the third flow path; a chemical treatment module that performs decolorization by chemical treatment on the water supplied from the first flow path; a physical treatment module that performs decolorization by physical treatment on the water supplied from the second flow path; Equipped with The processor: A method for controlling the opening and closing of the valve based on the sensing results of the sensor, and performing a step of discharging water from the third flow path after performing processing in at least one of the chemical treatment module and the physical treatment module for a predetermined period of time.

12. a sensor for measuring the quality of the water passing through; a valve that selectively sends the water whose quality has been measured to the first flow path, the second flow path, or the third flow path; a chemical treatment module that performs decolorization by chemical treatment on the water supplied from the first flow path; a physical treatment module that performs decolorization by physical treatment on the water supplied from the second flow path; a control unit that controls opening and closing of the valve based on the sensing result of the sensor, and sends out water from the third flow path after performing treatment in at least one of the chemical treatment module and the physical treatment module for a predetermined time; A system comprising:

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