Wastewater treatment system and wastewater treatment method

Abstract

An object of the present invention is to provide a wastewater treatment system and a wastewater treatment method which perform chemical treatment of wastewater with an overall simple configuration, even when the chemical treatment is performed as a preliminary step to biological treatment. [Solution] The above-mentioned object can be achieved by a wastewater treatment system or the like comprising wastewater storage means, chemical treatment agent supplying means, detection means, and control means, wherein the detection means predicts or detects the presence of a substance to be treated in the wastewater stored in the wastewater storage means, the chemical treatment agent supplying means supplies a chemical treatment agent into the wastewater, and the control means controls the supply of the chemical treatment agent by the chemical treatment agent supplying means based on a signal from the detection means.

Description

[Technical field]

[0001] The present invention relates to a wastewater treatment system and a wastewater treatment method for treating wastewater. [Background technology]

[0002] Domestic wastewater discharged from drainage facilities such as washrooms, toilets, bathrooms, laundry rooms, and kitchens contains nitrogen and phosphorus compounds, and their discharge can lead to river pollution, etc. Of these, nitrogen compounds are found in large amounts in domestic wastewater and serve as a nutrient source for microorganisms, which can lead to the problem of eutrophication in closed water areas.

[0003] Biological treatment using nitrification / denitrification is used to treat nitrogen compounds in domestic wastewater. Through biological treatment, nitrogen compounds are converted into nitric acid and released into the atmosphere as nitrogen gas. However, when wastewater contains a large amount of nitrogen compounds or when the concentration of nitrogen compounds in the wastewater is high, the nitrification / denitrification reaction in the biological treatment takes time, and if filtration is performed without sufficient biological treatment, the water quality, odor, and color of the treated water cannot be guaranteed. In particular, in the case of circulating water treatment, problems such as discomfort to users and damage to facilities may occur.

[0004] The main nitrogen compound in domestic wastewater is ammonia nitrogen, which originates from human wastewater. In addition to biological treatment, chemical treatment using an oxidizing agent such as sodium hypochlorite is known as a method for treating ammonia nitrogen (see, for example, Patent Document 1 and Non-Patent Document 1). With such chemical treatment, ammonia nitrogen can be released into the atmosphere as nitrogen gas without passing through nitric acid. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2001-225085 A [Non-patent literature]

[0006] [Non-Patent Document 1] "Chemical denitrification method for wastewater containing nitrogen compounds", retrieved on February 9, 2024, [URL]https: / / www.city.yokohama.lg.jp / kurashi / machizukuri-kankyo / kasen-gesuido / gesuido / shori / sokutei / chosa / koudosyori.files / 0146_20180827.pdf Summary of the Invention [Problem to be solved by the invention]

[0007] As described in Patent Document 1 and Non-Patent Document 1, by using a chemical treatment method that uses an oxidizing agent, ammonia nitrogen can be released into the atmosphere as nitrogen gas without passing through nitric acid.

[0008] However, as described in Patent Document 1, when a chemical treatment method utilizing an oxidizing agent is performed using a reaction tank (chemical treatment tank), a problem arises in that the configuration of the entire wastewater treatment system becomes complicated because a chemical treatment tank must be provided in addition to the biological treatment tank.

[0009] Therefore, the problem that the present invention aims to solve is to provide a wastewater treatment system and a wastewater treatment method that perform chemical treatment with an overall simple configuration, even when the chemical treatment is carried out as a preliminary step to biological treatment. [Means for solving the problem]

[0010] The inventors of the present invention, while carrying out intensive research to solve the above problems, came up with the idea of ​​chemically treating the materials to be treated just before or just after the wastewater containing the materials to be subjected to chemical treatment in order to omit the installation of a reaction tank. They then thought that if the materials to be treated in the received wastewater were directly brought into contact with a chemical treating agent, it would be possible to efficiently perform chemical treatment of the materials to be treated and subsequent biological treatment, while maintaining an overall simple configuration.

[0011] Based on this idea, the inventors have repeated trial and error and have succeeded in creating a wastewater treatment system and method that solves the problems of the present invention, the basic elements of which are wastewater storage means, chemical treatment agent supply means, detection means and control means. The present invention has been completed based on the idea and successful examples first conceived by the inventors.

[0012] That is, according to each aspect of the present invention, the following embodiments are provided. [1] A wastewater treatment system comprising: The system includes a wastewater collection means, a chemical treatment agent supply means, a detection means, and a control means, The detection means predicts or detects the presence of the substance to be treated in the wastewater stored in the wastewater storage means, The chemical treatment agent supplying means supplies a chemical treatment agent into the wastewater; and The control means controls the supply of the chemical treating agent by the chemical treating agent supply means based on a signal from the detection means. [2] The wastewater treatment system according to [1], wherein the chemical treatment agent is an oxidizing agent. [3] The wastewater treatment system according to [1] or [2], wherein the detection means predicts the presence of the material to be treated based on a source of the material to be treated, or detects the presence of the material to be treated based on at least one state of the wastewater selected from the group consisting of the water pressure, water volume, water level, water temperature, pH, electrical conductivity, odor, color, and turbidity of the wastewater, and the amount of microorganisms, inorganic matter, and the presence of organic matter in the wastewater. [4] A detection step in which a detection means predicts or detects the presence of the substance to be treated in the wastewater stored in the wastewater storage means; a chemical treatment agent supplying step of supplying a chemical treatment agent to the wastewater by a chemical treatment agent supplying means based on a signal from the detection means; A wastewater treatment method comprising: Effect of the Invention

[0013] According to the present invention, by predicting or detecting the presence of the material to be treated in the wastewater stored in the wastewater storage means and supplying a chemical treatment agent to the wastewater storage means in a timely manner, the material to be treated can be subjected to chemical treatment immediately after the wastewater is stored in the wastewater storage means. As a result, the wastewater treatment system of one aspect of the present invention does not need to be provided with a reaction tank separate from the wastewater storage means, and can efficiently subject the material to chemical treatment while having a simple overall configuration.

[0014] According to the present invention, since the material to be treated in the wastewater can be chemically treated, the load on the biological treatment tank that may be installed in the downstream can be reduced. For example, the wastewater treatment system according to one embodiment of the present invention can be applied to drainage facilities in washrooms, toilets, bathrooms, laundry rooms, kitchens, etc., to treat domestic wastewater discharged from these facilities, thereby oxidizing and decomposing and reducing the ammonia nitrogen in the domestic wastewater. This is expected to efficiently perform nitrification and denitrification reaction treatment by microorganisms on the domestic wastewater sent to the biological treatment tank. As a result, according to the present invention, the chemical and biological treatment of the wastewater can be appropriately performed. Furthermore, according to the present invention, the material to be treated, which is a pollutant, can be decomposed earlier, thereby avoiding damage, dirt, clogging, etc. of the wastewater storage means and the drain pipe, and the wastewater storage means and the drain pipe can be maintained in a clean state.

[0015] For example, in the case of a large-scale water treatment system, the amount of water retained in the treatment tank is large, so the quality of the inflow water and the amount of outflow water after treatment have little effect on the efficiency of wastewater treatment in the treatment tank. However, in the case of a small-scale circulating water treatment system, the smaller the system, the less water must be retained in the treatment tank, so the quality of the inflow water and the amount of outflow water after treatment have a large effect on the treatment efficiency. In particular, when a small-scale circulating water treatment system is applied to the treatment of household wastewater, the type, physical and chemical properties, and amount of the material to be treated vary greatly depending on the source of the wastewater, such as the washroom, toilet, bathroom, kitchen, and laundry room, and this greatly affects the treatment efficiency of the wastewater. In addition, a large amount of wastewater containing surfactant components, such as bath water and laundry water, may enter the treatment tank at once, and may foam and overflow during the treatment process. Therefore, by installing a wastewater treatment system according to one embodiment of the present invention in the upstream of a small-scale circulating water treatment system, the wastewater is decomposed to a degree that reduces the treatment load in the downstream, thereby suppressing significant fluctuations in the quality of the wastewater flowing into the small-scale circulating water treatment system and keeping it within a certain range, which is expected to maintain the treatment efficiency of the small-scale circulating water treatment system. Furthermore, by maintaining the treatment efficiency of the small-scale circulating water treatment system, it is possible to treat the wastewater at a faster rate than a normal water treatment system, and to supply purified water immediately upon request of the user. Therefore, according to the present invention, the burden of biological treatment on the water treatment system installed in the downstream can be reduced, and wastewater can be purified and regenerated in a shorter time than usual. [Brief description of the drawings]

[0016] [Figure 1] FIG. 1 is a schematic configuration diagram showing a wastewater treatment system 1 according to one embodiment of the wastewater treatment system. [Diagram 2] FIG. 2 is a block diagram showing the functional configuration of the control means 40. As shown in FIG. [Diagram 3] FIG. 3 is a flow chart showing the process of wastewater treatment performed by the wastewater treatment system 1. As shown in FIG. [Figure 4] FIG. 4 is a schematic diagram showing a system toilet 100 according to one embodiment of a wastewater treatment system. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0017] Each aspect of the present invention will be described in detail below, but the present invention can take various forms as long as it achieves its object.

[0018] Unless otherwise specified, each term in this specification is used in the sense commonly used by those skilled in the art of water treatment and the like, and should not be construed as having an unduly limiting meaning. In addition, the speculations and theories made in this specification are based on the inventors' knowledge and experience to date, and therefore the present invention is not limited solely to such speculations and theories.

[0019] "Comprise, contain, include" means that elements other than those explicitly stated to be included can be added (same meaning as "comprise at least"), but also encompasses "consist of" and "essentially consist of." That is, "comprise" can mean including the explicitly stated elements and any one or more elements, consisting of the explicitly stated elements, or essentially consisting of the explicitly stated elements. "Have" is synonymous with "include." Elements include parts, means, ingredients, steps, conditions, parameters, and other limitations. "And / or" means any one or any or all combinations of two or more of the associated listed items.

[0020] Each aspect of the present invention will be described with reference to the drawings. In each drawing, items that are less relevant to the present invention are omitted. Note that the direction indicated by the arrow UP (→UP) shown appropriately in each drawing is the upward vertical direction.

[0021] [Summary of the Invention] According to one aspect of the present invention, there is provided a wastewater treatment system comprising, as basic elements, wastewater storage means, chemical treatment agent supply means, detection means, and control means. The wastewater treatment system supplies a chemical treatment agent from the chemical treatment agent supply means immediately before or immediately after a material to be treated is supplied into the wastewater storage means together with wastewater, and treats the material to be treated by chemical treatment to decompose it.

[0022] The detection means detects whether or not a material to be treated is being supplied to the wastewater contained in the wastewater storage means, or whether or not the material to be treated has been supplied. When the detection means detects that the material to be treated is being supplied or that the material to be treated has been supplied, it sends a signal to the control means. The control means, having received the signal from the detection means, controls the chemical treatment agent supplying means to supply a chemical treatment agent to the wastewater contained in the wastewater storage means.

[0023] As a result, even if the wastewater contained in the wastewater storage means contains materials to be treated, the materials are instantly decomposed by chemical treatment, and the concentration of the materials in the wastewater is reduced. As a result, for example, a biological treatment tank provided downstream of the wastewater treatment system is not heavily loaded by the wastewater received from the wastewater treatment system, and the biological treatment of the wastewater can be efficiently carried out.

[0024] [Wastewater treatment system] A wastewater treatment system according to one aspect of the present invention includes wastewater containing means, chemical treatment agent supplying means, detection means, and control means.

[0025] A specific embodiment of the wastewater treatment system will be described with reference to FIG. The wastewater treatment system 1 includes wastewater storage means 10, chemical treatment agent supply means 20, detection means 30, and control means 40. For the sake of convenience, Fig. 1 illustrates wastewater 11 stored in the wastewater storage means 10, a drain pipe 50 extending from a drain outlet 12 of the wastewater storage means 10, and a biological treatment tank 60 connected to the drain pipe 50.

[0026] The wastewater collection means 10 can collect wastewater brought from outside the system. Examples of wastewater include, but are not limited to, domestic wastewater discharged from washrooms, toilets, kitchens, bathrooms, laundry rooms, etc., urban wastewater, commercial facility wastewater, agricultural wastewater, industrial wastewater, sewage, rainwater, surface water, seawater, and tap water. Specific examples of wastewater include human waste, bath water, kitchen wastewater, and laundry wastewater.

[0027] The drainage storage means 10 is configured to have a structure with an open upper end. By adopting such a configuration, the drainage storage means 10 can easily receive drainage from outside the system. However, the drainage storage means 10 may be configured to have a closed or semi-closed upper end as long as it is configured to be able to receive drainage from outside the system. In other words, the drainage storage means 10 may be a sealed or semi-sealed one that has a water inlet for receiving drainage from outside the system and a drain outlet for sending drainage to outside the system. The drainage storage means 10 may be drainage equipment and associated equipment in a washroom, toilet, bathroom, laundry room, kitchen, etc., such as, but is not limited to, a drain drain, a drain trap, a drain basin, etc.

[0028] The wastewater collecting means 10 has a recess 13 that is recessed on the lower end side. By providing the recess 13, the chemical treating agent from the chemical treating agent supplying means 20 is supplied to the wastewater 11 at the recess 13, thereby reducing the amount of wastewater 11 that comes into contact with the chemical treating agent. As a result, the number of times that the materials to be treated in the wastewater 11 come into contact with the chemical treating agent increases, making the chemical treatment more efficient and promoting decomposition of the materials to be treated. However, as long as chemical treatment using the chemical treating agent can be realized, the wastewater collecting means 10 may be configured so that the lower end side has a structure without a recess, i.e., a flat planar structure.

[0029] As described above, the smaller the amount of wastewater 11 stored in the wastewater storage means 10, the smaller the amount of chemical treatment agent required to decompose the substances to be treated. Therefore, the wastewater storage means 10 may be controlled to reduce the amount of wastewater 11 stored therein before the chemical treatment agent is supplied.

[0030] The chemical treatment agent supplying means 20 is configured to be able to supply a chemical treatment agent into the wastewater 11 contained in the wastewater containing means 10.

[0031] The chemical treatment agent supplied from the chemical treatment agent supply means 20 may be any agent capable of decomposing the material to be treated, and is appropriately selected according to the type of material contained in the wastewater 11. For example, when the material to be treated is a substance that has the property of being decomposed by oxidation, the chemical treatment agent is preferably an oxidizing agent. Examples of the oxidizing agent include hypochlorous acid and its salts, chlorous acid, chloric acid, perchloric acid, halogens such as chlorine, ozone, and hydrogen peroxide. The chemical treatment agent may be, for example, an oxidizing agent dissolved in water, or may be electrolyzed water obtained by electrolyzing tap water or the like. When the chemical treatment agent is an oxidizing agent, examples of the material to be treated include inorganic substances such as nitrogen compounds such as ammonia nitrogen, urea, ammonia, uric acid, and oxalic acid; organic substances such as sulfur compounds, oils, metabolites from the human body and pets, hydrocarbon compounds, proteins, uric sugar, dietary fiber, pulp, cellulose, chemical fibers, and chemicals such as surfactants. Similarly, when the object to be treated is a substance that has the property of being reduced and decomposed, an acidic substance, a basic substance, a substance that is difficult to decompose, etc., the chemical treating agent may be a reducing agent, a neutralizing agent, a radical agent, a chelating agent, etc., depending on the substance. For example, the neutralizing agent includes not only the neutralization of inorganic or organic substances, but also the neutralization of decomposition products of inorganic or organic substances. Examples of the neutralizing agent include commonly used neutralizing agents such as sodium hydroxide.

[0032] As a more specific example, when the wastewater 11 is human waste such as urine and feces, since the material to be treated contains a large amount of ammonia nitrogen, it is preferable that the chemical treatment agent be hypochlorous acid or an aqueous solution of its sodium salt.

[0033] There are no particular limitations on the method of supplying the chemical treatment agent, provided that the chemical treatment agent supplying means 20 has a structure for supplying the chemical treatment agent to the wastewater collection means 10. The chemical treatment agent supplying means 20 has a function of discharging the chemical treatment agent, such as a motor or a pump, and can supply the chemical treatment agent in the form of a solid, powder, granules, liquid, suspension, foam, mist, or the like, preferably a liquid or mist, to the wastewater 11 stored in the wastewater collection means 10.

[0034] The detection means 30 is configured to be able to detect the presence of the object to be treated in the wastewater 11. The detection means 30 is provided on the right side surface of the recess 13 in the wastewater storage means 10. The physical quantity detected by the detection means 30 is not particularly limited, and examples thereof include the water pressure, water volume, water level, water temperature, pH, electrical conductivity, odor, color, turbidity, etc. of the wastewater 11. The detection means 30 may also detect the amount of microorganisms in the wastewater 11. The detection means 30 detects these physical quantities or changes therein, converts the obtained detected quantities into appropriate signals, and inputs them to the control means 40. The detection means 30 is preferably, for example, one of various sensors that transmits the detected quantities to the control means 40 as electrical signals. The detection means 30 may also be a device having a detection probe such as an electrode.

[0035] The detection means 30 may be mounted so as to be non-contact with the wastewater 11. In this case, the detection means 30 may be a pyroelectric sensor, a microwave sensor, or the like.

[0036] The detection means 30 may be configured to detect the presence of a source of wastewater containing the material to be treated, such as a person discharging human waste, and to predict the presence of the material to be treated in the wastewater 11. In this case, the detection means 30 may be, for example, a human sensor, specifically, a contact type human sensor such as a tact switch or a piezoelectric element, an infrared sensor, an ultrasonic sensor, a microwave sensor, a millimeter wave sensor, or the like. The detection means 30 may detect the presence of a physical quantity such as light or vibration generated, such as sensing the opening and closing of the lid of the wastewater storage means 10, or may detect the absence of a physical quantity due to the reduction or disappearance of these.

[0037] The detection means 30 may predict and detect the presence of the object to be treated either continuously or intermittently.

[0038] The control means 40 is configured to continuously or intermittently receive the signal from the detection means 30 as an input value, and to be able to control the supply of the chemical treatment agent by the chemical treatment agent supply means 20 based on the signal.

[0039] The control means 40 preferably has a processing unit that determines whether or not a substance to be treated is present in the wastewater 11 based on a signal from the detection means 30. As a specific embodiment of the control means 40 having a processing unit, a block diagram showing a functional configuration of the control means 40 is illustrated in Fig. 2. However, in the case where the control means 40 emits a signal only when the detection means 30 predicts or detects the presence or absence of a substance to be treated in the wastewater 11, the control means 40 may not have a memory unit and a part or all of the processing unit.

[0040] 2, the control means 40 includes a processing unit 410, a storage unit 420, and an input / output unit 430. The control means 40 may further include a display unit. Each component is connected to each other via a bus 440 so as to be able to communicate with each other.

[0041] The processing unit 410 is configured to be capable of acquiring a signal from the detection means 30 and to be capable of issuing commands to the chemical processing agent supplying means 20. Based on the signal from the detection means 30, the processing unit 410 judges whether or not a substance to be treated is present in the wastewater 11 by checking the signal against an index value 421, a past signal history 422, or the like, or by using a judgment program 423, or the like.

[0042] The memory unit 420 is composed of a storage device, and stores an index value 421, a past signal history 422, a judgment program 423, etc. The memory unit 420 may store a signal from the detection means 30 that has just been acquired by the control means 40, an output value that is a judgment result from the processing unit 410, etc. The judgment program 423 functions to cause the processing unit 410 to judge the presence of a processed object based on the signal from the detection means 30 and the index value 421 and / or the signal history 422.

[0043] The input / output section 430 is configured to be capable of transmitting a signal from the detection means 30 to the processing section 410 and to be capable of transmitting a command to the chemical processing agent supplying means 20 based on the result of the determination by the processing section 410 .

[0044] Examples of the control means 40 include a control circuit, a microcontroller, a single board computer, a personal computer (notebook PC, desktop PC), a tablet terminal, and a smartphone.

[0045] The control means 40, the chemical processing agent supplying means 20 and the detection means 30 may be connected independently by wires, or may be connected wirelessly with or without a router or the like. The control means 40, the chemical processing agent supplying means 20 and the detection means 30 are preferably physically separated from each other, but two or all three of these means may be integrally configured as long as they perform their respective functions. For example, the control means 40 may be present as part of the structure that configures the chemical processing agent supplying means 20.

[0046] The control means 40 may turn the chemical treatment agent supplying means 20 to an ON state based on a signal emitted by the detection means 30, or may turn the chemical treatment agent supplying means 20 to an OFF state based on a signal emitted by the detection means 30. The chemical treatment agent supplying means 20 supplies the chemical treatment agent to the wastewater 11 when in the ON state, and stops the supply of the chemical treatment agent when in the OFF state.

[0047] The signal received by the control means 40 may be either qualitative or quantitative. When the signal received by the control means 40 is quantitative, the amount of chemical processing agent supplied by the chemical processing agent supply means 20 may be adjusted according to the magnitude of the signal. Even when the signal received by the control means 40 is qualitative, the amount of chemical processing agent supplied by the chemical processing agent supply means 20 may be adjusted according to the length of time the signal is input, etc.

[0048] The control means 40 may immediately or delayedly control the supply of the chemical treatment agent by the chemical treatment agent supply means 20 based on a signal from the detection means 30. For example, when the detection means 30 sends a signal indicating that the presence of the object to be treated in the wastewater 11 has been detected, it is preferable to immediately control the supply of the chemical treatment agent by the chemical treatment agent supply means 20. When the detection means 30 sends a signal indicating that the presence of the object to be treated in the wastewater 11 has been predicted, it is preferable to delayedly control the supply of the chemical treatment agent by the chemical treatment agent supply means 20. However, in this case, the chemical treatment agent supply means 20 may be controlled to supply the chemical treatment agent before, preferably immediately before, the object to be treated is input.

[0049] The control of the chemical processing agent supplying means 20 by the control means 40 may be performed based on a signal from the detection means 30 using AI (Artificial Intelligence) or the like.

[0050] In addition to the wastewater containment means, chemical treatment agent supply means, detection means and control means, the wastewater treatment system may include other components, such as a wastewater pipe 50 and a biological treatment tank 60, as illustrated in FIG.

[0051] The drain pipe 50 is configured to allow the drainage water 11 stored in the drainage water storing means 10 to pass through. The material, diameter, length, etc. of the drain pipe 50 are not particularly limited as long as the drainage water 11 can pass through it.

[0052] The biological treatment tank 60 is configured to be able to receive the wastewater 11 stored in the wastewater storage means 10 via the drain pipe 50. The biological treatment tank 60 purifies the received wastewater 11 by subjecting it to biological treatment, for example, nitrification / denitrification reaction treatment by microorganisms. The microorganisms may be aerobic microorganisms, anaerobic microorganisms, or a combination of these.

[0053] The biological treatment tank 60 may hold a mixture of aerobic microorganisms and / or anaerobic microorganisms, may have both an aerobic area and an anaerobic area, or may be a multi-tank tank with separate aerobic and anaerobic tanks. When the biological treatment tank 60 is a multi-tank tank, it can be structured to have two or more tanks by providing a partition such as a permeable membrane that allows water to pass through but not microorganisms.

[0054] In FIG. 1, the drain pipe 50 and the biological treatment tank 60 are continuously connected, but for example, a water storage tank or a separate treatment tank may be provided between them.

[0055] An example of a method of wastewater treatment by the wastewater treatment system 1 will be described with reference to the flowchart shown in FIG.

[0056] As illustrated in Fig. 3, the wastewater collection means 10 receives wastewater 11 from outside the system (S101). Next, the detection means 30 detects the object to be treated in the wastewater 11 received by the wastewater collection means 10 (S102). The detection means 30 sends the detection result as a signal to the control means 40 (S103). The control means 40 determines the presence of the object to be treated in the wastewater 11 based on the signal received from the detection means 30 (S104). However, the detection means 30 may be set not to send any signal to the control means 40 if it does not detect a physical quantity equal to or greater than a predetermined threshold value.

[0057] If the determination result indicates that the object to be treated is present in the wastewater 11, the control means 40 issues a command to the chemical treating agent supplying means 20 to supply the chemical treating agent (S105A). For example, the discharge mechanism in the chemical treating agent supplying means 20 is operated, specifically, the electric pump is energized to operate. This causes the chemical treating agent supplying means 20 to supply the chemical treating agent to the wastewater 11 (S106A). Note that if the chemical treating agent supplying means 20 has already supplied the chemical treating agent, it continues to supply the chemical treating agent.

[0058] On the other hand, if the determination result shows that no object to be treated is present in the wastewater 11, the control means 40 issues a command to the chemical processing agent supplying means 20 to stop supplying the chemical processing agent (S105B). For example, the operation of the discharge mechanism in the chemical processing agent supplying means 20 is stopped, specifically, the power supply to the electric pump is cut off. This causes the chemical processing agent supplying means 20 to stop supplying the chemical processing agent to the wastewater 11 (S106B). Note that if the chemical processing agent supplying means 20 is not supplying the chemical processing agent, the supply of the chemical processing agent is continued to be stopped.

[0059] After supplying the chemical treatment agent (S106A), the wastewater treatment system 1 is preferably controlled so as to stop supplying the chemical treatment agent or to supply the chemical treatment agent again by detecting the presence of the object to be treated in the wastewater 11 intermittently or continuously using the detection means 30, or after a predetermined time has elapsed.

[0060] By carrying out such a wastewater treatment method using the wastewater treatment system 1, the materials to be treated in the wastewater 11 flowing through the drainage pipe 10 can be subjected to chemical treatment and decomposed, and as a result, the wastewater 11 can be made into wastewater that is easily decomposable for biological treatment.

[0061] [Specific embodiment of wastewater treatment system] A specific embodiment of the wastewater treatment system is a system toilet. An example of the system toilet will be described with reference to FIG.

[0062] The system toilet 100 comprises a toilet bowl 110 which corresponds to the wastewater storage means, a hypochlorous acid supply means 120 which corresponds to the chemical treatment agent supply means, a human presence sensor 130 which corresponds to the detection means, and a control means 140. The system toilet 100 further comprises a drain pipe 150 extending from a drain outlet 112 of the toilet bowl 110, and a biological treatment tank 160 connected to the drain pipe 150.

[0063] In the toilet bowl 110, wastewater 111 accumulates in a recess 113. A user 170 can relieve himself / herself by sitting on a toilet seat 114, which is a seating surface. Human waste, which is excrement from the user 170, accumulates in the drainage 111 in the recess 113.

[0064] In the system toilet 100, when the human presence sensor 130 detects a user 170, it predicts that human waste will be added to the wastewater 111 and transmits a signal to the control means 140. Based on the signal from the human presence sensor 130, the control means 140 controls the hypochlorous acid supply means 120 to supply hypochlorous acid into the wastewater 111. The human presence sensor 130 may be a sensor that detects the excretion of human waste by the user 170, or a sensor that detects the opening and closing of the lid of the system toilet 100.

[0065] The timing of the supply of hypochlorous acid by the hypochlorous acid supply means 120 may be immediately after the human sensor 130 senses the user 170, or several seconds after the sensing, for example, during the time when the user 170 is urinating or after the time until urination is completely finished. However, considering the mixing efficiency of urine and hypochlorous acid, it is preferable that it is immediately after the human sensor 130 senses the user 170. Further, the system toilet 100 may predict that urine is added to the wastewater 111 when the lid of the toilet bowl 110 is opened, and supply hypochlorous acid to the wastewater 111 in advance before the user 170 excretes urine, and / or hypochlorous acid may be additionally supplied after excretion is finished. For example, the system toilet 100 may be controlled such that when the lid of the toilet bowl 110 is opened, hypochlorous acid is supplied to the wastewater 111, then the user 170 excretes urine, and then hypochlorous acid is additionally supplied to the wastewater 111 again after excretion is finished.

[0066] Also, from the viewpoint of the mixing efficiency of urine and hypochlorous acid, it is preferable that the amount of the wastewater 111 stored in the recess 113 is small. Therefore, the control means 140 may control the system toilet 100 to reduce the amount of the wastewater 111, for example, by discharging a part of the wastewater 111 stored in the recess 113 immediately after the human sensor 130 senses the user 170.

[0067] After the user 170 finishes urinating, the human sensor 130 may sense this, and washing water may be automatically flowed into the toilet bowl 110 by the control means 140 or other control means, or regardless of the sensing state of the human sensor 130, the user 170 may manually flow washing water into the toilet bowl 110.

[0068] When hypochlorous acid is supplied to the wastewater 111 containing urine, nitrogen compounds and ammonia nitrogen in the urine are oxidized and decomposed, and the wastewater 111 can be subjected to biological treatment without imposing an excessive load on the subsequent biological treatment tank 160. As a result, efficient biological treatment in the biological treatment tank 160 can be achieved, and the overall wastewater treatment efficiency can be improved.

[0069] [Application of wastewater treatment system] According to the wastewater treatment system of one aspect of the present invention, the presence of the object to be treated in the wastewater stored in the wastewater storage means is predicted or detected, and a chemical treatment agent is supplied to the wastewater storage means in a timely manner, so that the object to be treated can be subjected to chemical treatment immediately after it is stored in the wastewater storage means. Since such a wastewater treatment system can be simply configured, it can be applied to, for example, an autonomous circulation type water purification device, preferably a small-scale autonomous circulation type water purification device.

[0070] Therefore, a specific preferred embodiment of the wastewater treatment system of the present invention is an autonomous circulation type water purification device incorporating the wastewater treatment system of the present invention.

[0071] [Another aspect of the present invention] Another aspect of the present invention is a wastewater treatment method, which includes a detection step in which a detection means predicts or detects the presence of a substance to be treated in the wastewater stored in the wastewater storage means, and a chemical treatment agent supply step in which a chemical treatment agent supply means supplies a chemical treatment agent to the wastewater based on a signal from the detection means.

[0072] The chemical treating agent supply step is preferably performed automatically using a control means, but may be performed manually by visually checking a signal from the detection means, etc. The wastewater treatment method according to one aspect of the present invention is preferably realized by the wastewater treatment system according to one aspect of the present invention. [Industrial Applicability]

[0073] The wastewater treatment system according to one embodiment of the present invention has an overall simple configuration and is capable of chemically treating wastewater, and is therefore applicable to wastewater treatment in which both chemical and biological treatment are desired. The wastewater treatment system according to one embodiment of the present invention can be used in drainage facilities such as washrooms, toilets, bathrooms, laundry rooms, and kitchens, and can also be used in self-circulating water purification devices. [Explanation of symbols]

[0074] 1 Wastewater treatment system 10. Drainage containment means 11 Drainage 12 Drain 13 Recess 20 Chemical treatment agent supply means 30 Detection Method 40 Control Means 410 Processing section 420 Storage section 421 Index value 422 Signal History 423 Judgment Program 430 Input / output section 440 Bus 50 Drain pipe 60 Biological treatment tank

Claims

1. A wastewater treatment system comprising: The system comprises a wastewater storage means, a chemical treatment agent supply means, a detection means, a control means, and a biological treatment tank; The detection means predicts or detects the presence of the substance to be treated in the wastewater stored in the wastewater storage means, The chemical treatment agent supplying means supplies a chemical treatment agent into the wastewater stored in the wastewater storage means, The control means controls the supply of the chemical treatment agent by the chemical treatment agent supply means based on the signal from the detection means, so that the wastewater stored in the wastewater storage means is easily decomposable for biological treatment when the presence of the substance to be treated is predicted or detected, and the supply of the chemical treatment agent by the chemical treatment agent supply means is not controlled when the absence of the substance to be treated is predicted or detected, The biological treatment tank of the wastewater treatment system subjects the wastewater received from the wastewater storage means to biological treatment to regenerate it into purified water.

2. The wastewater treatment system of claim 1 , wherein the chemical treatment agent is an oxidizing agent.

3. The wastewater treatment system according to claim 1 or 2, wherein the detection means predicts the presence of the material to be treated based on a source of the material to be treated, or detects the presence of the material to be treated based on at least one state of the wastewater selected from the group consisting of water pressure, water volume, water level, water temperature, pH, electrical conductivity, odor, color, and turbidity of the wastewater, and the amount of microorganisms, inorganic matter, and the presence of organic matter in the wastewater.

4. A detection step in which a detection means predicts or detects the presence of the substance to be treated in the wastewater stored in the wastewater storage means; a chemical treatment agent supplying step for supplying a chemical treatment agent to the wastewater stored in the wastewater storage means by a chemical treatment agent supplying means when the presence of a substance to be treated is predicted or detected based on a signal from the detection means, so that the wastewater stored in the wastewater storage means is easily decomposable for biological treatment, and for not supplying a chemical treatment agent to the wastewater stored in the wastewater storage means by the chemical treatment agent supplying means when the absence of a substance to be treated is predicted or detected; a biological treatment step of subjecting the wastewater received from the wastewater storage means to biological treatment to regenerate it into purified water; A wastewater treatment method comprising:

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