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 a wastewater flow path, a chemical treatment agent supplying means, a detection means, and a control means, wherein the detection means detects the presence of a substance to be treated 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, 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 that flows through drainage channels attached to drainage facilities (water-related facilities) such as washrooms, toilets, bathrooms, laundry rooms, and kitchens contains nitrogen compounds and phosphorus compounds, and the discharge of these compounds 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 before or while the wastewater containing the materials flows through the wastewater flow path in order to eliminate 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 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 a wastewater flow path, a chemical treatment agent supplying means, a detection means and a 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 drainage flow path, a chemical treatment agent supplying means, a detection means, and a control means, The detection means detects the presence of the object to be treated in the 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 drainage flow path; 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 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 flow path by a chemical processing 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, the presence of the material to be treated in the wastewater flowing through the wastewater flow path can be detected at an early stage and a chemical treatment agent can be supplied to the wastewater flow path in a timely manner, so that the material to be treated in the wastewater flowing through the wastewater flow path can 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 have a reaction tank separate from the wastewater flow path, 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 flowing through the drainage flow path can be chemically treated, the load on the biological treatment tank that can 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 a drainage flow path attached to drainage facilities in a washroom, toilet, bathroom, laundry room, kitchen, etc., and the domestic wastewater discharged from these can be treated, and the ammonia nitrogen in the domestic wastewater can be oxidized, decomposed, and reduced. This is expected to efficiently perform nitrification / 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 treatment 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, so that damage, dirt, clogging, etc. of the drainage flow path can be avoided, and the drainage flow path 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, a wastewater treatment system is provided. The wastewater treatment system includes a wastewater flow path, a chemical treatment agent supplying means, a detection means, and a control means as basic elements. When a substance to be treated is detected in wastewater flowing through one portion of the wastewater flow path, the chemical treatment agent is supplied from the chemical treatment agent supplying means to the other portion of the wastewater flow path, and the substance to be treated is subjected to chemical treatment and decomposed, thereby performing wastewater treatment. The one portion and the other portion in the wastewater flow path may be in either a rear stage (downstream side) or a front stage (upstream side), or vice versa. These may also be combined. That is, a detection means may be provided in 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 in the other portion, and a chemical treatment agent may be supplied to the one portion. With such a configuration, when it is detected that the supply of the chemical treatment agent in the upstream portion is insufficient, the chemical treatment agent can be additionally supplied to the downstream portion.

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

[0023] As a result, the materials to be treated in the wastewater flowing through the drainage flow path are decomposed by chemical treatment at an earlier timing, so the concentration of the materials to be treated in the wastewater is reduced. As a result, for example, a biological treatment tank installed at the rear 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 carried out efficiently. In addition, by detecting the materials to be treated in the drainage flow path and supplying a chemical treatment agent from a more upstream location, the materials to be treated can be decomposed, for example, in a wastewater storage tank or drainage pipe installed at the rear of the drainage 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 detection means, and a control 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 supplying means 20, a detecting means 30, and a controlling means 40. For the sake of 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 the drainage water can pass through it.

[0027] Examples of wastewater include, but are not limited to, wastewater from households, cities, commercial facilities, agricultural facilities, industrial facilities, etc., discharged from washrooms, toilets, kitchens, bathrooms, laundry rooms, etc., wastewater, 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 such 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 a chemical treatment agent supplying means 20. In this manner, the drainage flow path may be configured such that a section to which the chemical treatment agent is supplied, such as the upstream section 12, receives wastewater and / or stores the wastewater. Furthermore, the drainage flow path may have either a part or a plurality of 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 is short, and it is more preferable that the upstream section 12 and the downstream section 13 are close to each other 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 bowl, bathtub, washing machine, sink, and equipment associated with these, such as a drain drain, drain trap, and drain pit.

[0031] In Fig. 1, the drain pipe 10 is connected to a biological treatment tank 60 at its downstream end. In this way, it is preferable that the drainage flow path is 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 drainage can flow in and out may be included in the concept of the drainage flow path in the present 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 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.

[0034] 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.

[0035] There are no particular limitations on the method of supplying the chemical treatment agent, as long as the chemical treatment agent supplying means 20 has a structure for supplying the chemical treatment agent to the upstream section 12 of the drainage pipe 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 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 the material to be treated in the wastewater 11. The detection means 30 is attached to the pipe wall in the downstream portion 13 of the drain pipe 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.

[0037] The detection means 30 may or may not have a detection unit (detection probe) in contact with the wastewater 11, but may be installed, for example, so that the detection probe 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 a 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 detect the presence of a physical quantity such as light or vibration generated by the wastewater, or may detect the absence of a physical quantity due to the reduction or disappearance of these. 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 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 the 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 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 unit 430 is configured to be capable of transmitting a signal from the detection means 30 to the processing unit 410 and to be capable of transmitting 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, 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 with a delay 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 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.

[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 the 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] 1 is configured to be capable of receiving wastewater 11 flowing out from a drain pipe 10. 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 thereof.

[0052] 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.

[0053] In FIG. 1, the drain 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 of wastewater treatment by 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 the drain pipe 10 (S101). Next, the detection means 30 detects the object to be treated in the wastewater 11 flowing in the downstream section 13 of the drain pipe 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.

[0056] 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 treatment agent supplying means 20 to supply the chemical treatment agent (S105A). For example, the discharge mechanism in the chemical treatment agent supplying means 20 is operated, specifically, the electric pump is energized to operate. This causes the chemical treatment agent supplying 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 supplying 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 object to be treated is present in the wastewater 11, the control means 40 issues a command to the chemical treatment agent supplying means 20 to stop supplying the chemical treatment agent (S105B). For example, the operation of the discharge mechanism in the chemical treatment agent supplying means 20 is stopped, specifically, the power supply to the electric pump is cut off. This causes the chemical treatment agent supplying 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 supplying means 20 is not supplying the chemical treatment agent, the supply of the chemical treatment agent is continued to be stopped.

[0058] 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.

[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 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.

[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 described with reference to FIG.

[0061] The system toilet 100 comprises a toilet bowl 112 integrally constructed at the upstream end of a drain pipe 110, a hypochlorous acid supply means 120 corresponding to a chemical treatment agent supply means, an optical sensor 130 corresponding to a 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. Human waste, which is excrement from the user 170, 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, flushing water is poured into 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., which 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 hypochlorous acid supply 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. In addition, the above supply may be continued 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 is no longer detected.

[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 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 flowing through one part of the wastewater flow path is detected, and the object to be treated in the wastewater flowing through the wastewater flow path is subjected to chemical treatment by supplying a chemical treatment agent to the other part of the wastewater flow path in a timely manner. 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.

[0067] 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.

[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 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]

[0070] 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]

[0071] 1 Wastewater treatment system 10 Drain pipe 11 Drainage 12 Upper reaches 13 Downstream 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 60 Biological treatment tank

Claims

1. A wastewater treatment system comprising: The system includes a drainage flow path, a chemical treatment agent supplying means, a detection means, a control means, and a biological treatment tank, The detection means detects the presence of the object to be treated in the 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 drainage flow path; The control means controls the supply of the chemical treatment agent by the chemical treatment agent supply means based on a signal from the detection means, so that the wastewater flowing through one portion of the wastewater flow path is easily decomposable for biological treatment when the presence of the substance to be treated is detected, and so that the chemical treatment agent is not supplied to the other portion of the wastewater flow path when the absence of the substance to be treated is detected, and The biological treatment tank of the wastewater treatment system subjects the wastewater received from one portion of the wastewater flow path 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. 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 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 detects the presence of a substance to be treated in wastewater flowing through one portion of a wastewater flow path; a chemical treatment agent supplying step in which, based on a signal from the detection means, when the presence of the substance to be treated is detected, a chemical treatment agent is supplied to the other portion of the drainage flow path by a chemical treatment agent supplying means so that the wastewater flowing through one portion of the drainage flow path is easily decomposable for biological treatment, and when the absence of the substance to be treated is detected, the chemical treatment agent is not supplied to the other portion of the drainage flow path; a biological treatment step of subjecting the wastewater received from one portion of the wastewater flow path to biological treatment to regenerate it into purified water; A wastewater treatment method comprising:

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