Wastewater treatment system and wastewater treatment method

Abstract

To provide a wastewater treatment system and a wastewater treatment method which perform chemical treatment of wastewater by a generally simple configuration even if the treatment is performed as a pre-stage of biological treatment.SOLUTION: A wastewater treatment system comprises a wastewater flow path, chemical treatment agent supply means, detection means, and control means, where the detection means detects the presence of a subject to be treated in wastewater flowing in one portion of the wastewater flow path, the chemical treatment agent supply means supplies a chemical treatment agent into the other portion of the wastewater flow path, and the control means controls supply of the chemical treatment agent by the chemical treatment agent supply means on the basis of a signal from the detection means.SELECTED DRAWING: Figure 1

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 that flows through drainage channels attached to drainage facilities (water-related 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 cause 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 to nitric acid and then 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 biological treatment takes time. If the treated water is filtered without sufficient biological treatment, the quality, odor, and color of the treated water may not be maintained. This can cause discomfort to users and damage to equipment, especially in circulating water treatment systems.

[0004] The main nitrogen compound in domestic wastewater is ammonia nitrogen, which is generated from human waste. In addition to biological treatment, chemical treatment using an oxidizing agent such as sodium hypochlorite is known as a treatment for 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] Japanese Patent Application Laid-Open No. 2001-225085 [Non-patent literature]

[0006] [Non-Patent Document 1] "Chemical denitrification method for wastewater containing nitrogen compounds," retrieved 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 going through nitric acid.

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

[0010] As the inventors of the present invention have conducted extensive research to solve the above problems, they have come up with the idea of ​​chemically treating the wastewater containing the materials to be treated before or while the wastewater flows through the wastewater flow path, thereby eliminating the need for a reaction tank. They then thought that if the materials to be treated in the wastewater flowing through the wastewater flow path were brought into contact with a chemical treating agent at an earlier timing, it would be possible to efficiently perform chemical treatment of the materials and subsequent biological treatment, while maintaining a simple overall configuration.

[0011] Based on this idea, the inventors have, through repeated trial and error, succeeded in creating a wastewater treatment system and method that solves the problems of the present invention, the system and method comprising a wastewater flow path, a chemical treatment agent supply means, a detection means, and a control means as basic elements. 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 comprises a drainage flow path, a chemical treatment agent supplying means, a detecting means, and a control means, the detection means detects the presence of the substance to be treated in the wastewater flowing through one portion of the wastewater flow path, the chemical treatment agent supply means supplies a chemical treatment agent to the other portion of the drainage channel; and The control means controls the supply of the chemical treating agent by the chemical treating agent supply means based on the 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 detects the presence of the substance 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, as well as the amount of microorganisms in the wastewater, and the presence of inorganic and organic matter. [4] A detection step in which a detection means detects the presence of a substance to be treated in wastewater flowing through one portion of the wastewater flow path; a chemical processing agent supplying step of supplying a chemical processing agent to the other portion of the drainage channel by a chemical processing agent supplying means based on a signal from the detection means; A wastewater treatment method comprising: [Effects of the Invention]

[0013] According to the present invention, the presence of a substance to be treated in wastewater flowing through a wastewater flow path can be detected early and a chemical treatment agent can be supplied to the wastewater flow path in a timely manner, thereby enabling the substance to be treated in the wastewater flowing through the wastewater flow path to be subjected to chemical treatment at an earlier timing. As a result, the wastewater treatment system of one aspect of the present invention does not need to include a reaction tank separate from the wastewater flow path, and can efficiently subject the substance to chemical treatment while having a simple overall configuration.

[0014] According to the present invention, the wastewater flowing through the drainage channel can be chemically treated, thereby reducing the load on a biological treatment tank that may be installed downstream. For example, a wastewater treatment system according to one embodiment of the present invention can be applied to drainage channels attached to drainage facilities in washrooms, toilets, bathrooms, laundry rooms, kitchens, etc., to treat domestic wastewater discharged from these channels, thereby oxidizing, decomposing, and reducing ammonia nitrogen in the domestic wastewater. This is expected to enable efficient microbial nitrification / denitrification treatment of the domestic wastewater sent to the biological treatment tank. As a result, the present invention allows for appropriate chemical and biological treatment of wastewater. Furthermore, the present invention allows for earlier decomposition of pollutants, thereby avoiding damage, contamination, and clogging of the drainage channel and maintaining the drainage channel in a clean state.

[0015] For example, in large-scale water treatment systems, the amount of water retained in the treatment tank is large, so the quality of the influent and the amount of treated outflow have little impact on the efficiency of wastewater treatment in the treatment tank. However, in small-scale circulating water treatment systems, the smaller the system, the less water must be retained in the treatment tank, so the quality of the influent and the amount of treated outflow have a significant impact on treatment efficiency. In particular, when small-scale circulating water treatment systems are applied to the treatment of household wastewater, the type, physical and chemical properties, and amount of treated material vary greatly depending on the source of wastewater, such as the washroom, toilet, bathroom, kitchen, or laundry room, which significantly affects the wastewater treatment efficiency. Furthermore, if a large amount of wastewater containing surfactant components, such as bath water or laundry water, enters the treatment tank at once, there is a risk of foaming and overflow during the treatment process. Therefore, by installing a wastewater treatment system according to one embodiment of the present invention upstream of a small-scale circulating water treatment system, the wastewater can be decomposed to a degree that reduces the treatment load in the downstream stage, thereby suppressing large 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 conventional water treatment systems, allowing purified water to be supplied immediately upon user request. Therefore, according to the present invention, the burden of biological treatment in the downstream water treatment system is reduced, and wastewater can be purified and reclaimed in a shorter time than usual. [Brief explanation of the drawings]

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

[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. Furthermore, 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," and "include" mean that elements other than those explicitly stated as included may be added (same meaning as "comprise at least"), but also encompass "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, elements that are less relevant to the present invention are omitted. Note that the direction indicated by the arrow UP (→UP) shown as appropriate in each drawing is the upward direction in the vertical direction.

[0021] [Summary of the Invention] According to one aspect of the present invention, a wastewater treatment system is provided. The wastewater treatment system includes, as basic elements, a wastewater flow path, a chemical treatment agent supplying means, a detection means, and a control means. When a substance to be treated is detected in wastewater flowing through one portion of the wastewater flow path, the chemical treatment agent supplying means supplies a chemical treatment agent to the other portion of the wastewater flow path, thereby chemically treating and decomposing the substance to be treated. The one portion and the other portion of the wastewater flow path may be arranged such that one portion is located downstream and the other portion is located upstream, or vice versa. A combination of these may also be used. That is, a detection means may be provided at one portion of the wastewater flow path, and a chemical treatment agent may be supplied to the other portion, and a detection means may be provided at the other portion, and a chemical treatment agent may be supplied to the one portion. This configuration allows for supplemental supply of chemical treatment agent to the downstream portion when it is detected that the supply of chemical treatment agent at the upstream portion is insufficient.

[0022] The presence or absence of a substance to be treated in the wastewater flowing through one portion of the wastewater flow path is detected by a detection means. When the detection means detects the presence of a substance to be treated, it sends a signal to a control means. Upon receiving the signal from the detection means, the control means controls the chemical treatment agent supply means to supply a chemical treatment agent into the other portion of the wastewater flow path.

[0023] As a result, the substances to be treated in the wastewater flowing through the wastewater flow path are decomposed by chemical treatment at an earlier timing, thereby reducing the concentration of the substances to be treated in the wastewater. As a result, for example, a biological treatment tank installed downstream of a wastewater treatment system is not heavily burdened by the wastewater received from the wastewater treatment system, and the biological treatment of the wastewater can be carried out efficiently. Furthermore, by detecting the substances to be treated in the wastewater flow path and supplying a chemical treatment agent from a location further upstream, the substances to be treated can be decomposed, for example, in a wastewater storage tank or drainage pipe installed downstream of the wastewater flow path.

[0024] [Wastewater treatment system] A wastewater treatment system according to one aspect of the present invention includes a wastewater flow path, a chemical treatment agent supplying means, a detecting means, and a controlling means.

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

[0026] The drain pipe 10 is configured to allow drainage water brought from outside the system to pass through. That is, the drain pipe 10 has a hollow structure. The material, diameter, length, etc. of the drain pipe 10 are not particularly limited as long as they can allow drainage water to pass through.

[0027] 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, tap water, etc. Specific examples of wastewater include human waste, bath water, kitchen wastewater, laundry wastewater, etc.

[0028] In the drain pipe 10, wastewater flows from the upstream side to the downstream side. As shown in the figure, the drain pipe 10 is configured so that an upstream section 12 provided on the upstream side stores wastewater 11. A chemical treatment agent is supplied to the upstream section 12 from chemical treatment agent supply means 20. In this way, the drainage flow path may be configured so that a section to which the chemical treatment agent is supplied, such as the upstream section 12, receives and / or stores wastewater. Furthermore, the drainage flow path may have either some or multiple sections with different diameters, or a uniform diameter overall.

[0029] The drain pipe 10 has a downstream section 13 on the downstream side. A detection section 30 is provided in the downstream section 13 to detect the state of water quality in the downstream section 13. In the drain pipe 10, the upstream section 12 and the downstream section 13 may be located apart from each other, and the distance between them is not particularly limited, but considering the time lag between the detection of water quality in the downstream section 13 and the supply of a chemical treatment agent in the upstream section 12, it is preferable that the distance be short, and it is more preferable that the upstream section 12 and the downstream section 13 are close to or adjacent to each other.

[0030] 1, the upstream end of the drain pipe 10 is shown as the upstream portion 12, but the upstream end of the drain flow path may be connected to drainage equipment in a washroom, toilet, bathroom, laundry room, kitchen, etc. That is, the upstream end of the drain pipe 10 may be connected to drainage equipment in a washroom, toilet, bathroom, laundry room, kitchen, etc., such as a toilet, bathtub, washing machine, sink, and associated equipment such as a drain, drain trap, or catch basin.

[0031] In Figure 1, the drain pipe 10 is connected at its downstream end to a biological treatment tank 60. In this way, it is preferable that the drainage flow path be connected to the biological treatment tank at its downstream end, but it may or may not be connected to something else, such as a water tank. A water tank or a biological treatment tank into which wastewater can flow in and out may be included in the concept of a drainage flow path in this invention.

[0032] The chemical treatment agent supplying means 20 is configured to be able to supply a chemical treatment agent into the wastewater 11 in the upstream portion 12 of the drainage pipe 10.

[0033] The chemical treating agent supplied from the chemical treating agent supply means 20 may be any agent capable of decomposing the target material and is appropriately selected depending on the type of target material contained in the wastewater 11. For example, if the target material is a substance that decomposes when oxidized, the chemical treating agent is preferably an oxidizing agent. Examples of oxidizing agents include hypochlorous acid and its salts, chlorous acid, chloric acid, perchloric acid, halogens such as chlorine, ozone, and hydrogen peroxide. The chemical treating 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 treating agent is an oxidizing agent, the target material may be inorganic substances such as nitrogen compounds such as ammonia nitrogen, urea, ammonia, uric acid, and oxalic acid; sulfur compounds, oils, metabolites from the human body or pets, hydrocarbon compounds, proteins, urinary sugar, dietary fiber, pulp, cellulose, synthetic fibers, surfactants, and other chemicals. Similarly, when the material to be treated is a substance that decomposes upon reduction, an acidic substance, a basic substance, a substance that is difficult to decompose, or the like, the chemical treating agent may be a reducing agent, a neutralizing agent, a radical agent, a chelating agent, or the like, 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.

[0034] As a more specific example, when the wastewater 11 is human waste such as urine and feces, the material to be treated contains a large amount of ammonia nitrogen, and therefore the chemical treatment agent is preferably hypochlorous acid or an aqueous solution of its sodium salt.

[0035] There are no particular limitations on the method of supplying the chemical treatment agent for the chemical treatment agent supply means 20, as long as it is configured to supply the chemical treatment agent to the upstream section 12 of the drainage pipe 10. The chemical treatment agent supply means 20 is equipped with a chemical treatment agent discharge function such as a motor or pump, and can thereby 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 chemical treatment agent, to the wastewater 11 in the upstream section 12 of the drainage pipe 10.

[0036] The detection means 30 is configured to be able to detect the presence of a substance to be treated in the wastewater 11. The detection means 30 is attached to the pipe wall in the downstream portion 13 of the drainage pipe 10. The physical quantities detected by the detection means 30 are not particularly limited, and examples 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 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 be a device having a detection probe such as an electrode.

[0037] The detection means 30 may or may not have a detection unit (detection probe) in contact with the wastewater 11. For example, the detection probe may be installed so that it is in contact with the wastewater 11, i.e., inside the drain pipe 10. In this case, the detection means 30 may be a contact sensor such as a pyroelectric sensor or piezoelectric element, an infrared sensor, an ultrasonic sensor, a microwave sensor, a millimeter wave sensor, an optical sensor, or the like. The detection means 30 may also detect the presence of physical quantities such as light or vibration generated by the wastewater, or may detect the absence of such physical quantities due to their reduction or disappearance. The detection of the presence of the object to be treated by the detection means 30 may be either continuous or intermittent.

[0038] The control means 40 is configured to receive the signal from the detection means 30 continuously or intermittently 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 the functional configuration of the control means 40 is illustrated in Figure 2. However, if the control means 40 emits a signal only when the detection means 30 detects the presence or absence of a substance to be treated in the wastewater 11, the control means 40 may not have part or all of the memory unit and 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 able to acquire a signal from the detection means 30 and to issue a command to the chemical treatment agent supply means 20. Based on the signal from the detection means 30, the processing unit 410 determines whether or not a substance to be treated is present in the wastewater 11 by comparing the signal with an index value 421, a past signal history 422, etc., or by using a determination program 423, etc.

[0042] The memory unit 420 is configured with a storage device and stores an index value 421, a past signal history 422, a determination 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 determination result from the processing unit 410, etc. The determination program 423 functions to cause the processing unit 410 to determine the presence of an object to be processed based on the signal from the detection means 30 and the index value 421 and / or the signal history 422.

[0043] The input / output unit 430 is configured to be able to transmit a signal from the detection means 30 to the processing unit 410 and to be able to transmit a command to the chemical processing agent supplying means 20 based on the determination result of the processing unit 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, chemical processing agent supply means 20, and detection means 30 may be independently connected by wire, or may be connected wirelessly with or without a router or the like. The control means 40, chemical processing agent supply means 20, and detection means 30 are preferably physically separated from one another, but two or all three of these may be integrated as long as they perform their respective functions. For example, the control means 40 may be present as part of the structure that constitutes the chemical processing agent supply means 20.

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

[0047] The signal received by the control means 40 may be either qualitative or quantitative. If 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 depending on the magnitude of the signal. Even if 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 depending on 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 the signal from the detection means 30. For example, when the detection means 30 sends a signal indicating that the presence of a substance 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.

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

[0050] In a wastewater treatment system, the wastewater flow path may be anything that allows water to pass through, and the concept includes, for example, a drainage basin having a wastewater inlet / outlet, a wastewater adjustment tank, a biological treatment tank, and even a water pump, etc. The wastewater treatment system may include other components in addition to the wastewater flow path, chemical treatment agent supply means, detection means, and control means.

[0051] The biological treatment tank 60 illustrated in Fig. 1 is configured to be able to receive wastewater 11 flowing out from the drain pipe 10. The biological treatment tank 60 purifies the received wastewater 11 by subjecting it to biological treatment, for example, nitrification-denitrification treatment by microorganisms. The microorganisms may be aerobic microorganisms, anaerobic microorganisms, or a combination thereof.

[0052] The biological treatment tank 60 may hold a mixture of aerobic 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.

[0053] In FIG. 1, the drainage pipe 10 and the biological treatment tank 60 are continuously connected, but for example, a water storage tank or another treatment tank may be provided between them.

[0054] An example of a method for wastewater treatment using the wastewater treatment system 1 will be described with reference to the flowchart shown in FIG.

[0055] As illustrated in FIG. 3, wastewater 11 is caused to flow from the upstream side to the downstream side of drainage pipe 10 (S101). Next, detection means 30 detects the material to be treated in wastewater 11 flowing through downstream section 13 of drainage pipe 10 (S102). Detection means 30 sends the detection result as a signal to control means 40 (S103). Control means 40 determines the presence of the material to be treated in wastewater 11 based on the signal received from detection means 30 (S104). However, detection means 30 may be configured not to send any signal to control means 40 if it does not detect a physical quantity equal to or greater than a predetermined threshold.

[0056] If the determination result indicates that a substance to be treated is present in the wastewater 11, the control means 40 issues a command to the chemical treatment agent supply means 20 to supply the chemical treatment agent (S105A). For example, the discharge mechanism in the chemical treatment agent supply means 20 is activated, specifically, an electric pump is energized to operate it. This causes the chemical treatment agent supply means 20 to supply the chemical treatment agent toward the upstream portion 12 of the drainage pipe 10 (S106A). Note that if the chemical treatment agent supply means 20 has already supplied the chemical treatment agent, it continues to supply the chemical treatment agent.

[0057] On the other hand, if the determination result shows that no material to be treated is present in the wastewater 11, the control means 40 issues a command to the chemical treatment agent supply means 20 to stop supplying the chemical treatment agent (S105B). For example, the operation of the discharge mechanism in the chemical treatment agent supply means 20 is stopped, specifically, the power supply to the electric pump is cut off. This causes the chemical treatment agent supply means 20 to stop supplying the chemical treatment agent to the upstream portion 12 of the drainage pipe 10 (S106B). Note that if the chemical treatment agent supply means 20 is not supplying the chemical treatment agent, the supply of the chemical treatment agent remains stopped.

[0058] After the chemical treatment agent has been supplied (S106A), the wastewater treatment system 1 is preferably controlled to stop the supply of 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.

[0059] 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 are 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.

[0060] [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 explained with reference to FIG.

[0061] The system toilet 100 comprises a toilet bowl 112 integrally formed at the upstream end of a drain pipe 110, a hypochlorous acid supply means 120 corresponding to the chemical treatment agent supply means, an optical sensor 130 corresponding to the detection means, and a control means 140. The system toilet 100 further comprises a biological treatment tank 160 connected to the drain pipe 110.

[0062] A user 170 can relieve himself / herself by sitting on a toilet seat 114, which is the seat surface of the toilet bowl 1120. The excrement from the user 170, namely, human waste, is collected in a drainage 111 in the toilet bowl 112.

[0063] In the system toilet 100, when a user 170 has finished using the toilet, they flush the toilet bowl 112, causing wastewater 111 containing human waste to flow from the upstream side to the downstream side of the drain pipe 110. An optical sensor 130 disposed in the downstream portion 113 of the drain pipe 110 detects changes in turbidity, color, etc. that indicate the presence of human waste in the wastewater 111, and transmits a signal to the control means 140. Based on the signal from the optical sensor 130, the control means 140 controls the hypochlorous acid supply means 120 to supply hypochlorous acid into the toilet bowl 112.

[0064] The supply of hypochlorous acid by the hypochlorous acid supply means 120 is performed intermittently or continuously, preferably immediately after the optical sensor 130 detects a change in turbidity or the like that indicates the presence of human waste in the wastewater 111. Furthermore, the supply may continue for a while even after the optical sensor 130 no longer detects a change in turbidity or the like, for example, for several seconds to several tens of seconds after the detection has stopped.

[0065] When hypochlorous acid is supplied to wastewater 111 containing human waste, nitrogen compounds and ammonia nitrogen in the human waste are oxidized and decomposed, and the wastewater 111 can be subjected to biological treatment without placing an excessive load on the downstream biological treatment tank 160. As a result, efficient biological treatment is achieved in the biological treatment tank 160, and the overall wastewater treatment efficiency can be improved.

[0066] [Application of wastewater treatment systems] According to one aspect of the present invention, a wastewater treatment system detects the presence of a substance to be treated in wastewater flowing through one portion of a wastewater flow path and supplies a chemical treatment agent to the other portion of the wastewater flow path in a timely manner, thereby chemically treating the substance to be treated in the wastewater flowing through the wastewater flow path. Because such a wastewater treatment system can be simply configured, it can be applied to, for example, an autonomous circulation type water purification system, preferably a small-scale autonomous circulation type water purification system.

[0067] Therefore, a specific preferred embodiment of the wastewater treatment system of one aspect of the present invention is an autonomous circulation type water purification device incorporating the wastewater treatment system of one aspect of the present invention.

[0068] [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 detects the presence of a substance to be treated in wastewater flowing through one part of a wastewater flow path, and a chemical treatment agent supply step in which a chemical treatment agent supply means supplies a chemical treatment agent to the other part of the wastewater flow path based on a signal from the detection means.

[0069] The chemical treating agent supply step is preferably carried out automatically using a control means, but may also be carried out manually by visually checking a signal from the detection means. The wastewater treatment method of one aspect of the present invention is preferably realized by the wastewater treatment system of one aspect of the present invention. [Industrial Applicability]

[0070] The wastewater treatment system of one embodiment of the present invention has a simple overall configuration and is capable of chemically treating wastewater, and therefore can be used for treating wastewater where both chemical and biological treatment are desired. The wastewater treatment system of 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-sustaining circulation water purification devices. [Explanation of symbols]

[0071] 1. Wastewater treatment system 10 Drain pipe 11 Drainage 12 Upper reaches 13 Downstream 20 Chemical treatment agent supply means 30 Detection means 40 Control Means 410 Processing section 420 Storage section 421 index value 422 Signal History 423 Judgment Program 430 Input / output section 440 Bus 60 Biological treatment tank

Claims

1. A wastewater treatment system comprising: The system comprises a drainage flow path, a chemical treatment agent supplying means, a detecting means, and a control means, the detection means detects the presence of the substance to be treated in the wastewater flowing through one portion of the wastewater flow path, the chemical treatment agent supply means supplies a chemical treatment agent to the other portion of the drainage channel; and The control means controls the supply of the chemical treating agent by the chemical treating agent supply means based on the signal from the detection means.

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

3. 3. The wastewater treatment system according to claim 1, wherein the detection means 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, and the presence of inorganic and organic matter in the wastewater.

4. a detection step in which a detection means detects the presence of a substance to be treated in wastewater flowing through one portion of the wastewater flow path; a chemical processing agent supplying step of supplying a chemical processing agent to the other portion of the drainage channel by a chemical processing agent supplying means based on a signal from the detection means; A wastewater treatment method comprising:

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