Wastewater treatment system and wastewater treatment method

Abstract

The purpose of the present invention is to provide a wastewater treatment system and a wastewater treatment method for efficiently performing wastewater treatment with a simple overall structure. The purpose is achieved by a wastewater treatment system or the like, the wastewater treatment system comprising: a drainage facility; a treatment tank having a detection means; and a control means. The detection means of the treatment tank predicts or detects the state of treated water in the treatment tank, and the control means controls, on the basis of a signal from the detection means of the treatment tank, the drainage facility so that the state of the treated water falls within a prescribed range.

Description

Wastewater treatment system and wastewater treatment method

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

[0002] Domestic wastewater discharged from 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 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 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] Ammonia nitrogen, which is generated from human wastewater, is a major nitrogen compound in domestic wastewater. Apart from 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). This chemical treatment allows ammonia nitrogen to be released into the atmosphere as nitrogen gas without passing through nitric acid.

[0005] Japanese Patent Application Laid-Open No. 2001-225085

[0006] "Chemical denitrification method for wastewater containing nitrogen compounds," retrieved February 9, 2024, [URL] https: / / www.city.yokohama.lg.jp / kurashii / machizukuri-kankyo / kasen-gesui-do / gesui-do / shorii / sokutei / chosa / koudosyori.files / 0146_20180827.pdf

[0007] As described in Patent Document 1 and Non-Patent Document 1, by using a chemical treatment method using 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 chemical treatment tank must be provided separately from the biological treatment tank, which creates a problem in that the overall configuration of the wastewater treatment system becomes complicated.

[0009] On the other hand, if the wastewater contains a small amount of nutrients for microorganisms, the efficiency of biological treatment in the biological treatment tank will decrease when the wastewater flows into the biological treatment tank. In other words, it is desirable for the wastewater to contain an appropriate amount of nutrients for microorganisms in order to ensure efficient biological treatment.

[0010] Therefore, an object of the present invention is to provide a wastewater treatment system and a wastewater treatment method that can efficiently treat wastewater while having a simple overall configuration.

[0011] As the inventors of the present invention conducted extensive research to solve the above problems, they came to the conclusion that if drainage equipment installed upstream that receives and treats wastewater and discharges wastewater is controlled to increase the amount of wastewater, decompose the materials to be treated in the wastewater, and supply the materials to be treated in the wastewater based on the state of the treated water in a treatment tank installed downstream, it may be possible to treat wastewater efficiently while maintaining an overall simple configuration.

[0012] Similarly, the inventors thought that if the treatment tank installed downstream was controlled based on the state of the wastewater in the drainage equipment installed upstream, or by combining these, it would be possible to efficiently treat wastewater while maintaining an overall simple configuration.

[0013] Based on this idea, the inventors have repeatedly tried and tested various methods to solve the problems of the present invention, and as a result, have succeeded in creating a wastewater treatment system and method whose basic elements are a wastewater treatment facility, a treatment tank, and a control means. The present invention has been completed based on the idea and successful examples first conceived by the inventors.

[0014] That is, according to each aspect of the present invention, the following embodiments are provided. [1-1] A wastewater treatment system comprising: a drainage facility, a treatment tank having a detection means, and a control means, wherein the detection means of the treatment tank predicts or detects the state of the treated water in the treatment tank, and the control means controls the drainage facility so that the state of the treated water falls within a predetermined range based on a signal from the detection means of the treatment tank. [1-2] A wastewater treatment system comprising: a drainage facility having a detection means, a treatment tank, and a control means, wherein the detection means of the drainage facility predicts or detects the state of the wastewater in the drainage facility, and the control means controls the treatment tank so that the state of the treated water in the treatment tank falls within a predetermined range based on a signal from the detection means of the drainage facility. [1-3] A wastewater treatment system comprising a drainage facility having a detection means, a treatment tank having a detection means, and a control means, wherein the detection means of the treatment tank predicts or detects the state of treated water in the treatment tank, the detection means of the drainage facility predicts or detects the state of wastewater in the drainage facility, and the control means controls the drainage facility based on a signal from the detection means of the treatment tank so that the state of the treated water falls within a predetermined range, and controls the treatment tank based on a signal from the detection means of the drainage facility so that the state of the treated water in the treatment tank falls within the predetermined range. [1-4] The wastewater treatment system according to item [1-1] or [1-3], wherein the control of the drainage facility is the supply of water to the drainage facility or the supply of a water treatment accelerator to the drainage facility. [1-5] The wastewater treatment system according to item [1-2] or [1-3], wherein the control of the treatment tank is the discharge of treated water from the treatment tank or the supply of water or a water treatment accelerator to the treatment tank. [1-6] The wastewater treatment system according to any one of items [1-1] to [1-3], wherein the water treatment promoter is a water treatment promoter that decomposes or neutralizes inorganic or organic substances, or a water treatment promoter that is a nutrient component or disinfectant component for microorganisms.[1-7] The wastewater treatment system according to item [1-1] or [1-3], wherein the detection means of the treatment tank predicts or detects at least one state of the treated water selected from the group consisting of water pressure, water volume, water level, water temperature, pH, electrical conductivity, odor, color, and turbidity of the treated water, as well as the amount of microorganisms in the treated water, and the presence of inorganic and organic matter. [1-8] The wastewater treatment system according to item [1-2] or [1-3], wherein the detection means of the wastewater treatment equipment predicts the state of the treated water based on a source of the material to be treated, or predicts or detects 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 presence of inorganic and organic matter in the wastewater. [1-9] A wastewater treatment method comprising: a detection step in which the detection means of the treatment tank detects the state of the treated water in the treatment tank; and a drainage equipment control step in which the drainage equipment is controlled based on a signal from the detection means of the treatment tank so that the state of the treated water falls within a predetermined range. [1-10] A wastewater treatment method comprising: a detection step in which a detection means of the drainage equipment predicts or detects the state of wastewater in the drainage equipment; and a treatment tank control step in which the treatment tank is controlled so that the state of the treated water in the treatment tank falls within a predetermined range based on a signal from the detection means of the drainage equipment. [1-11] A wastewater treatment method comprising: a detection step in which a detection means of the treatment tank detects the state of the treated water in the treatment tank; a detection step in which the detection means of the drainage equipment predicts or detects the state of the wastewater in the drainage equipment; a drainage equipment control step in which the drainage equipment is controlled so that the state of the treated water falls within a predetermined range based on a signal from the detection means of the treatment tank; and a treatment tank control step in which the treatment tank is controlled so that the state of the treated water in the treatment tank falls within a predetermined range based on a signal from the detection means of the drainage equipment. Furthermore, according to each aspect of the present invention, the following embodiments are provided.[2-1] A wastewater treatment system comprising a drainage facility having a water treatment promoter supply means, a biological treatment tank having a detection means, and a control means, wherein the biological treatment tank is capable of receiving wastewater discharged from the drainage facility, the detection means of the biological treatment tank predicts or detects the state of the treated water in the biological treatment tank, and the control means controls the drainage facility so that the water treatment promoter supply means supplies a water treatment promoter to the wastewater in the drainage facility based on a signal from the detection means of the biological treatment tank, and the state of the treated water in the biological treatment tank falls within a predetermined range. [2-2] A wastewater treatment system comprising a drainage facility having a water treatment promoter supply means and a detection means, a biological treatment tank having a detection means, and a control means, wherein the biological treatment tank is capable of receiving wastewater discharged from the drainage facility, the detection means of the biological treatment tank predicts or detects the state of treated water in the biological treatment tank, the detection means of the drainage facility predicts or detects the state of wastewater in the drainage facility, and the control means controls the drainage facility based on a signal from the detection means of the biological treatment tank to supply a water treatment promoter to the wastewater in the drainage facility so that the state of the treated water falls within a predetermined range, and controls the biological treatment tank based on the signal from the detection means of the drainage facility so that the state of the treated water in the biological treatment tank falls within a predetermined range. [2-3] The wastewater treatment system according to item [2-2], wherein the control of the biological treatment tank is the discharge of treated water from the biological treatment tank or the supply of water or a water treatment promoter to the biological treatment tank. [2-4] The wastewater treatment system according to any one of items [2-1] to [2-3], wherein the water treatment accelerator is a water treatment accelerator that decomposes or neutralizes inorganic or organic substances, or a water treatment accelerator that is a nutrient component or disinfectant component for microorganisms. [2-5] The wastewater treatment system according to any one of items [2-1] to [2-3], wherein the detection means of the biological treatment tank predicts or detects at least one state of the treated water selected from the group consisting of the water pressure, water volume, water level, water temperature, pH, electrical conductivity, odor, color, and turbidity of the treated water, and the amount of microorganisms, inorganic matter, and the presence of organic matter in the treated water.[2-6] The wastewater treatment system according to item [2-2], wherein the detection means of the wastewater treatment equipment predicts the state of the treated water based on the source of the material to be treated, or predicts or detects 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, turbidity, and the presence of inorganic and organic matter in the wastewater. [2-7] A wastewater treatment method comprising: a detection step in which the detection means of the biological treatment tank predicts or detects the state of the treated water in a biological treatment tank that can receive wastewater discharged from the wastewater treatment equipment; and a wastewater treatment equipment control step in which the water treatment promoter supply means of the wastewater treatment equipment supplies a water treatment promoter to the wastewater in the wastewater equipment based on a signal from the detection means of the biological treatment tank, and controls the wastewater treatment equipment so that the state of the treated water falls within a predetermined range. [2-8] A wastewater treatment method comprising: a detection step in which a detection means of the biological treatment tank detects the state of treated water in a biological treatment tank that is capable of receiving wastewater discharged from a wastewater treatment facility; a detection step in which a detection means of the wastewater treatment facility predicts or detects the state of wastewater in the wastewater treatment facility; a drainage facility control step in which a water treatment promoter supplying means of the wastewater treatment facility supplies a water treatment promoter to the wastewater in the wastewater treatment facility based on a signal from the detection means of the biological treatment tank, and controls the drainage facility so that the state of the treated water falls within a predetermined range; and a biological treatment tank control step in which the biological treatment tank is controlled based on a signal from the detection means of the drainage facility so that the state of the treated water in the biological treatment tank falls within a predetermined range. [2-9] A wastewater treatment system comprising: a drainage facility having a water treatment promoter supply means and a detection means; a biological treatment tank; and a control means, wherein the biological treatment tank is capable of receiving wastewater discharged from the drainage facility; the detection means of the drainage facility predicts or detects the state of the wastewater in the drainage facility; and the control means controls the biological treatment tank so that the water treatment promoter supply means supplies a water treatment promoter to the wastewater in the drainage facility based on a signal from the detection means of the drainage facility, and the state of the treated water in the biological treatment tank is within a predetermined range.[2-10] A wastewater treatment method comprising: a detection step in which a detection means of the wastewater treatment equipment predicts or detects the state of wastewater in the wastewater treatment equipment; and a biological treatment tank control step in which a water treatment promoter supplying means of the wastewater treatment equipment supplies a water treatment promoter to the wastewater in the wastewater treatment equipment based on a signal from the detection means of the wastewater treatment equipment, and controls the biological treatment tank so that the state of the treated water in the biological treatment tank, which is capable of receiving wastewater discharged from the wastewater treatment equipment, falls within a predetermined range.

[0015] According to the present invention, by predicting or detecting the state of treated water in the treatment tank and controlling the drainage equipment in a timely manner, and / or by predicting or detecting the state of wastewater in the drainage equipment and controlling the treatment tank in a timely manner, wastewater treatment in the treatment tank can be performed efficiently, thereby keeping the state of treated water in the treatment tank within a predetermined range. As a result, the wastewater treatment system of one aspect of the present invention can perform wastewater treatment efficiently despite its overall simple configuration.

[0016] According to the present invention, materials to be treated in wastewater can be decomposed more quickly, thereby reducing the load on the treatment tank installed downstream of the wastewater treatment facility. For example, if a wastewater treatment system according to one embodiment of the present invention is applied to the wastewater treatment facility and the downstream treatment tank in a washroom, toilet, bathroom, laundry room, kitchen, etc., it is possible to efficiently oxidize, decompose, and reduce ammonia nitrogen in domestic wastewater. This is expected to enable efficient microbial nitrification / denitrification treatment of the domestic wastewater sent to the wastewater treatment tank. As a result, the present invention allows for appropriate wastewater treatment. Furthermore, since the materials to be treated, which are pollutants, can be decomposed more quickly, damage, dirt, clogging, etc. of the wastewater treatment facility, the treatment tank, and the drainage pipes connected to them can be avoided, and these can be maintained in a clean state.

[0017] 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 influent and the amount of treated outflow have little impact 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 smaller the amount of water retained in the treatment tank must be, so the quality of the influent and the amount of treated outflow have a significant impact on 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 treated material vary greatly depending on the source of the wastewater, such as the washroom, toilet, bathroom, kitchen, or laundry room, which significantly affects the wastewater treatment efficiency. In addition, 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 overflowing during the treatment process. Therefore, by applying a wastewater treatment system according to one embodiment of the present invention to a small-scale circulating water treatment system, the wastewater in the wastewater treatment facility or discharged from the wastewater treatment facility can be decomposed to a degree that reduces the treatment load in the downstream treatment tank. This suppresses significant fluctuations in the quality of the wastewater flowing into the small-scale circulating water treatment system and keeps it within a certain range, thereby maintaining 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 on the wastewater treatment system can be reduced and wastewater can be purified and recycled in a shorter time than usual.

[0018] FIG. 1 is a schematic configuration diagram showing a wastewater treatment system 1 according to one embodiment of the wastewater treatment system. FIG. 2 is a block diagram showing the functional configuration of a control means 40 associated with the wastewater treatment system 1. FIG. 3 is a flowchart showing wastewater treatment performed by the wastewater treatment system 1. FIG. 4 is a schematic configuration diagram showing a wastewater treatment system 2 according to one embodiment of the wastewater treatment system. FIG. 5 is a block diagram showing the functional configuration of a control means 40 associated with the wastewater treatment system 2. FIG. 6 is a flowchart showing wastewater treatment performed by the wastewater treatment system 2. FIG. 7 is a schematic configuration diagram showing a system toilet 200 according to one embodiment of the wastewater treatment system. FIG. 8 is a schematic configuration diagram showing a system toilet 201 according to one embodiment of the wastewater treatment system.

[0019] 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.

[0020] 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.

[0021] "Comprise," "contain," and "include" mean that elements other than those explicitly stated to be included can 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 "comprise." Elements include parts, means, ingredients, steps, conditions, parameters, and other limitations. "And / or" means any one of the associated listed items, or any or all combinations of two or more.

[0022] 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.

[0023] [Summary of the Invention] According to one aspect of the present invention, a wastewater treatment system is provided. The wastewater treatment system of the present invention can be broadly divided into three aspects. The wastewater treatment system of the first aspect of the present invention basically comprises a drainage system, a treatment tank having a detection means, and a control means. The wastewater treatment system of the first aspect of the present invention predicts or detects the state of treated water in the treatment tank and controls the drainage system installed upstream of the treatment tank so that the state of the treated water falls within a predetermined range. The control of the drainage system may, for example, be controlled to supply water to the drainage system when the amount of treated material in the treated water is large, or to supply a water treatment promoter, which serves as a nutrient for microorganisms, to the drainage system when the amount of treated material in the treated water is small. The wastewater treatment system of the first aspect of the present invention comprises a treatment tank equipped with a detection means that predicts or detects the state of the treated water in the treatment tank using the detection means provided in the treatment tank, and a control means that controls the drainage system by supplying a water treatment promoter to the drainage system based on a signal from the detection means so that the state of the treated water in the treatment tank falls within a predetermined range. By adopting such a configuration for the wastewater treatment system of the first aspect of the present invention, the state of the treated water in the treatment tank can be predicted or detected and the drainage equipment can be controlled in a timely manner, thereby enabling efficient wastewater treatment in the treatment tank, thereby keeping the state of the treated water in the treatment tank within a predetermined range, and further enabling efficient wastewater treatment despite an overall simple configuration.

[0024] A wastewater treatment system according to a second aspect of the present invention includes, as its basic elements, a drainage facility having a detection means, a treatment tank, and a control means. The wastewater treatment system according to the second aspect of the present invention predicts or detects the state of wastewater in the drainage facility and controls the treatment tank, which is installed downstream of the drainage facility, so that the state of treated water in the treatment tank falls within a predetermined range. The treatment tank is controlled, for example, by discharging treated water into the treatment tank when the amount of wastewater to be treated is small, or by supplying a water treatment promoter, such as an oxidant, that decomposes the treated water into the treatment tank when the amount of wastewater to be treated is large, and / or by supplying water, such as clean water or treated water, to the treatment tank.

[0025] A wastewater treatment system according to a third aspect of the present invention combines the wastewater treatment system according to the first aspect of the present invention with the wastewater treatment system according to the second aspect of the present invention, and includes as its basic elements a drainage facility having a detection means, a treatment tank having a detection means, and a control means. The wastewater treatment system according to the third aspect of the present invention predicts or detects the state of the treated water in the treatment tank and the state of the wastewater in the drainage facility, and controls the drainage facility and the treatment tank so that the state of the treated water in the treatment tank falls within a predetermined range. The control of the treatment tank and the drainage facility is, for example, by controlling the drainage facility to supply water to the drainage facility when the amount of treated material in the treated water is large, and controlling the treatment tank to supply water or a water treatment promoter such as an oxidant that decomposes the treated material to the treatment tank. Furthermore, when the amount of treated material in the treated water is small, the treatment tank is controlled to discharge the treated water into the treatment tank, and controlling the drainage facility to supply a water treatment promoter that serves as a nutrient for microorganisms to the drainage facility.

[0026] The conditions of the treated water and wastewater are detected (or predicted) by detection means provided in the treatment tank and the wastewater equipment, respectively. When the detection means detects the conditions of the treated water and wastewater, i.e., the presence or absence of a substance to be treated, it sends a signal to the control means. The control means, upon receiving a signal from the detection means, controls the wastewater equipment if it receives a signal from the treatment tank, and controls the treatment tank if it receives a signal from the wastewater equipment.

[0027] As a result, fluctuations in the state of the treated water in the treatment tank can be suppressed, and the treatment tank is not placed under heavy load by the wastewater received from the drainage equipment, allowing for efficient wastewater treatment.

[0028] [Wastewater Treatment System of First Aspect] The wastewater treatment system of the first aspect of the present invention includes a drainage facility, a treatment tank having a detection means, and a control means.

[0029] A specific embodiment of the wastewater treatment system of the first embodiment will be described with reference to Fig. 1. The wastewater treatment system 1 includes a drainage facility 10, a treatment tank 60 having a detection means 30, and a control means 40. For convenience, Fig. 1 illustrates wastewater 11 contained in the drainage facility 10 and treated water 61 to be treated in the treatment tank 60.

[0030] The drainage equipment 10, also called plumbing equipment, is equipment configured to receive water from outside the system in a washroom, toilet, kitchen, bathroom, laundry room, etc., and discharge water (drainage) outside the system, and may be, for example, a toilet, sink, bathtub, washing machine, and associated equipment such as a drainage drain, drainage trap, and catch basin, but is not limited to these.

[0031] The drainage equipment 10 has a water treatment accelerator supply means 20 that supplies a water treatment accelerator to the wastewater 11 in the drainage equipment 10, and a drain pipe 50 that extends from the drain outlet 12 and connects to the treatment tank 60. That is, the drainage equipment 10 is composed of a main body that accommodates the wastewater 11, the water treatment accelerator supply means 20, and the drain pipe 50. The drainage equipment 10 has the water treatment accelerator supply means 20, and the control means 40 controls the water treatment accelerator supply means 20 to supply the water treatment accelerator to the wastewater 11 in the drainage equipment 10 based on a signal from the detection means 30 in the treatment tank 60.

[0032] The wastewater 11 may be any water that is received by the drainage system 10 and then discharged from the drainage system 10, and examples thereof 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.

[0033] The drainage equipment 10 is configured to have an open upper end. This configuration of the drainage equipment 10 allows it to easily receive water from outside the system. However, the drainage equipment 10 may also be configured with a closed or semi-closed upper end, as long as it is configured to be able to receive water from outside the system.

[0034] The drainage equipment 10 has a recess 13 at the lower end of the main body. A water treatment accelerator from the water treatment accelerator supply means 20 is supplied to the drainage water 11 in the recess 13, thereby reducing the amount of the drainage water 11 that comes into contact with the water treatment accelerator. As a result, if the water treatment accelerator is used for chemical treatment of the drainage water, such as with an oxidizing agent, the number of times the substances to be treated in the drainage water 11 come into contact with the water treatment accelerator increases, thereby making the chemical treatment more efficient and promoting the decomposition of the substances to be treated in the drainage water 11. However, as long as chemical treatment using the water treatment accelerator can be achieved, the drainage equipment 10 may be configured so that the lower end does not have a recess, i.e., has a flat, planar structure.

[0035] As described above, the smaller the amount of wastewater 11 stored in the drainage system 10, the smaller the amount of water treatment accelerator required to decompose the materials to be treated. Therefore, the drainage system 10 may be controlled to reduce the amount of wastewater 11 stored therein before the water treatment accelerator is supplied.

[0036] The water treatment accelerator supply means 20 of the drainage equipment 10 is configured to be able to supply a water treatment accelerator into the wastewater 11 that is contained in or discharged by the drainage equipment 10 .

[0037] The water treatment accelerator supplied from the water treatment accelerator supply means 20 may be any agent that promotes wastewater treatment in the treatment tank 60. Examples of such agents include those capable of decomposing the materials to be treated and those that serve as nutrients for microorganisms. The agent is selected appropriately depending on the condition of the treated water 61. For example, when the treated water 61 contains a large amount of materials that can be decomposed by oxidation, the water treatment accelerator 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 water treatment accelerator 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 water treatment accelerator is an oxidizing agent, the materials to be treated may include inorganic substances such as nitrogen compounds such as ammonia nitrogen, urea, ammonia, uric acid, and oxalic acid; and organic substances such as sulfur compounds, oils, metabolites from the human body and pets, hydrocarbon compounds, proteins, uric sugar, dietary fiber, pulp, cellulose, synthetic fibers, and chemicals such as surfactants. Similarly, when the material to be treated is a substance that decomposes upon reduction, an acidic substance, a basic substance, a persistent substance, or the like, the water treatment accelerator 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.

[0038] When the amount of material to be treated in the treated water 61 is small or almost nonexistent, the water treatment accelerator preferably serves as a nutrient for microorganisms. Nutrients for microorganisms can be anything that microorganisms can assimilate to grow or sustain themselves. Examples of such nutrients include carbon, nitrogen, phosphorus, and minerals, which are essential for microbial growth. Specific examples include alcohol, sugar, amino acids, and fatty acids. The water treatment accelerator may also be a disinfectant component for killing microorganisms. Disinfectant components include inorganic disinfectants such as hydrogen peroxide and hypochlorous acid, and organic disinfectants such as ethanol, regardless of their state, whether solid or liquid. Examples of when a disinfectant component is supplied include, but are not limited to, when biofilm formation in a wastewater treatment system, decay in a treatment tank, or the generation of foul odors is detected.

[0039] As a more specific example, if the wastewater 11 is human waste such as urine and feces, the treated water 61 will contain a large amount of ammonia nitrogen, and therefore the water treatment promoter is preferably hypochlorous acid or an aqueous solution of its sodium salt.

[0040] The water treatment promoter supplying means 20 is not particularly limited in terms of the method for supplying the water treatment promoter to the wastewater 11 in the drainage system 10. The water treatment promoter supplying means 20 is equipped with a water treatment promoter discharge function such as a motor or a pump, and can thereby supply the water treatment promoter in the form of a solid, powder, granules, liquid, suspension, foam, mist, or the like, preferably a liquid or mist, to the wastewater 11 contained in the drainage system 10. However, the water treatment promoter supplying means 20 may also be configured to be able to supply the water treatment promoter into the wastewater 11 discharged from the drainage system 10, for example, into the wastewater 11 flowing through the drain pipe 50. The water treatment promoter supplying means 20 may be one or more, depending on the type of water treatment promoter to be supplied.

[0041] The drain pipe 50 provided in the drainage equipment 10 is configured to allow the drainage water 11 accommodated in the main body of the drainage equipment 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 the drain pipe 50.

[0042] The drainage equipment 10 is controlled according to the state of the treated water 61, such as by starting and stopping the supply of water treatment accelerator by the water treatment accelerator supply means 20 and by starting and stopping the supply of water to the main body of the drainage equipment 10.

[0043] The treatment tank 60 having the detection means 30 is configured to receive the wastewater 11 discharged from the drainage equipment 10 and treat (wastewater treatment) the wastewater 11 to purify and / or regenerate it. The detection means 30 is configured to be able to predict or detect the state of the treated water 61 in the treatment tank 60. The detection means 30 may be provided in the treatment tank 60 so as to be able to predict or detect the state of the treated water 61 in the treatment tank 60.

[0044] The detection means 30 can detect the presence of a substance to be treated contained in the treated water 61. That is, the detection means 30 can detect, as a physical quantity, changes in water quality due to the presence of the substance to be treated in the treated water 61. The physical quantity detected by the detection means 30 is not particularly limited, and examples include the water pressure, water volume, water level, water temperature, pH, electrical conductivity, odor, color, and turbidity of the treated water 61. It may also be the amount of microorganisms in the wastewater 11. The detection means 30 detects these physical quantities or their changes, converts the detected quantities into appropriate signals, and inputs them to the control means 40. The detection means 30 may also emit a signal when it does not detect the physical quantity to be detected. The detection means 30 is preferably, for example, a sensor that transmits the detected quantity to the control means 40 as an electrical signal. The detection means 30 may be a device having a detection probe such as an electrode.

[0045] The detection means 30 may be provided so as not to come into contact with the treatment water 61. In this case, the detection means 30 may be a pyroelectric sensor, a microwave sensor, or the like.

[0046] The detection of the state of the treated water 61 by the detection means 30 may be either continuous or intermittent.

[0047] The wastewater treatment in the treatment tank 60 may be biological treatment, chemical treatment, or a combination of these, but biological treatment is preferred. The following description will be given assuming that the treatment tank 60 is a tank that performs biological treatment of the wastewater 11, i.e., a biological treatment tank.

[0048] The treatment tank 60 subjects the received wastewater 11 to biological treatment, for example, nitrification-denitrification treatment using microorganisms, thereby purifying the wastewater 11. The microorganisms may be aerobic microorganisms, anaerobic microorganisms, or a combination thereof.

[0049] The 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 treatment tank 60 is a multi-tank tank, it can be configured to have a two or more tank structure by providing a partition such as a permeable membrane that allows water to pass through but not the microorganisms.

[0050] In FIG. 1, the drain pipe 50 and the treatment tank 60 are continuously connected, but for example, a water storage tank or another treatment tank may be provided between them.

[0051] When the treatment tank 60 is a tank that performs chemical treatment of wastewater, the treatment tank 60 is configured so that an oxidizing agent can be supplied, for example.

[0052] The control means 40 is configured to receive signals continuously or intermittently as input values ​​from the detection means 30 provided in the treatment tank 60, and to be able to control the drainage equipment 10 based on the signals.

[0053] The control means 40 preferably has a processing unit that determines the state of the treated water 61 based on the 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 treated water 61, the control means 40 may not have a memory unit or part or all of the processing unit.

[0054] 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.

[0055] The processing unit 410 is configured to be able to acquire a signal from the detection means 30 and to issue commands to the drainage equipment 10. The processing unit 410 determines the state of the treated water 61 based on the signal from the detection means 30 by comparing it with an index value 421, a past signal history 422, etc., or by using a determination program 423, etc.

[0056] The memory unit 420 is configured with 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 state of the treated water 61 based on the signal from the detection means 30 and the index value 421 and / or the signal history 422.

[0057] 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 drainage equipment 10 based on the determination result of the processing unit 410.

[0058] 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.

[0059] The control means 40, the drainage equipment 10, and the detection means 30 may be independently connected by wire, or may be connected wirelessly with or without a router or the like. It is preferable that the control means 40, the drainage equipment 10, and the detection means 30 are physically separated from each other, but two or all three of these may be configured as an integrated unit 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 drainage equipment 10.

[0060] The control means 40 controls the drainage equipment 10 based on the signal emitted by the detection means 30 so that the state of the treated water 61 falls within a predetermined range. For example, if the amount of materials to be treated in the treated water 61 is high, the control means 40 controls the drainage equipment 10 to supply a water treatment promoter that promotes decomposition of the materials to the wastewater 11 in the drainage equipment 10 and / or to supply water to the main body of the drainage equipment 10. Furthermore, for example, if the amount of materials to be treated in the treated water 61 is low, the control means 40 controls the drainage equipment 10 to supply a water treatment promoter that serves as a nutrient for microorganisms to the wastewater 11 in the drainage equipment 10 and / or to discharge the wastewater 11 from the main body of the drainage equipment 10. Furthermore, for example, if the amount of materials to be treated in the treated water 61 is within a predetermined range, the control means 40 controls the drainage equipment 10 so that the water treatment promoter is not supplied.

[0061] 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 water treatment promoter supplied by the water treatment promoter supply means 20, the supply of water to the main body of the drainage equipment 10, the amount of wastewater discharged from the drainage equipment 10, etc. may be adjusted depending on the magnitude of the signal. Furthermore, even when the signal received by the control means 40 is qualitative, the amount of water treatment promoter supplied by the water treatment promoter supply means 20, the supply of water to the main body of the drainage equipment 10, the amount of wastewater discharged from the drainage equipment 10, etc. may be adjusted depending on the length of time the signal is input, etc.

[0062] The control means 40 may control the drainage equipment 10 immediately or with a delay based on the signal from the detection means 30. For example, when the detection means 30 sends a signal indicating that the treated water 61 is in a state where the amount of treated material is large or small, it is preferable to control the drainage equipment 10 immediately.

[0063] The control of the drainage equipment 10 by the control means 40 may be performed using AI (Artificial Intelligence) or the like based on a signal from the detection means 30. In control using a machine learning model that uses AI, algorithms used for learning and inference include, but are not limited to, unsupervised learning models such as k-means clustering and lazy learning algorithms such as k-nearest neighbors.

[0064] The state of the treated water 61 is preferably within a range that allows efficient wastewater treatment in the treatment tank 60. For this purpose, the treated water 61 preferably contains neither too much nor too little material to be treated; and / or, the material to be treated preferably contains an appropriate amount of nutrients for microorganisms and a small amount of components that inhibit the growth of or damage microorganisms.

[0065] 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.

[0066] 3 , the detection means 30 in the treatment tank 60 detects the state of the water 61 to be treated in the treatment tank 60, specifically, the amount of material to be treated (S101). Next, the detection means 30 sends a different signal to the control means 40 as the detection result depending on the state of the water 61 to be treated (S102). The control means 40 determines the state of the water 61 to be treated based on the signal received from the detection means 30 (S103). However, the detection means 30 may be configured not to send any signal to the control means 40 if it does not detect a physical quantity that deviates from a predetermined threshold range.

[0067] If the result of the determination is that the amount of the material to be treated in the treated water 61 is large or small, or if the amount of the material to be treated in the treated water 61 is neither large nor small, the drainage equipment 10 is controlled according to the result (S104).

[0068] If the amount of the material to be treated in the treated water 61 is high or low, the drainage equipment 10 is controlled accordingly so that the amount of the material to be treated in the treated water 61 falls within a predetermined range (S105A). For example, the discharge mechanism in the water treatment accelerator supply means 20 of the drainage equipment 10 is operated, specifically, by energizing the electric pump. This causes the water treatment accelerator supply means 20 to supply the water treatment accelerator toward the wastewater 11 in the drainage equipment 10. Note that if the water treatment accelerator supply means 20 is already supplying the water treatment accelerator, it continues to supply the water treatment accelerator.

[0069] On the other hand, if the amount of material to be treated in the treated water 61 is neither too much nor too little, the drainage equipment 10 is controlled so as to maintain the state of the treated water 61 (S105B). For example, the operation of the discharge mechanism in the water treatment promoter supply means 20 of the drainage equipment 10 is stopped, specifically, the power supply to the electric pump is cut off. This causes the water treatment promoter supply means 20 to stop supplying the water treatment promoter to the wastewater 11 in the drainage equipment 10. Note that if the water treatment promoter supply means 20 is not supplying the water treatment promoter, the supply of the water treatment promoter is continued to be stopped.

[0070] In the wastewater treatment system 1, after controlling the drainage equipment 10 (S105A), it is preferable to control the drainage equipment 10 to stop the supply of the water treatment promoter or to supply the water treatment promoter again by intermittently or continuously detecting the presence of the substance to be treated in the treated water 61 using the detection means 30, or after a predetermined time has elapsed.

[0071] The wastewater treatment system of the first aspect may include other components in addition to the drainage equipment, the treatment tank having the detection means, and the control means. For example, the wastewater treatment system of the first aspect may include a display means for displaying the state of the treated water. The control means may display the state of the treated water on the display means based on a signal from the detection means of the treatment tank, and a user of the drainage equipment may operate the drainage equipment by, for example, supplying a water treatment accelerator to the drainage equipment, supplying water to the main body of the drainage equipment, or increasing the amount of wastewater from the drainage equipment, thereby controlling the drainage equipment so that the state of the treated water falls within a predetermined range.

[0072] [Second Aspect of Wastewater Treatment System] The second aspect of the wastewater treatment system of the present invention includes a wastewater facility having a detection means, a treatment tank, and a control means.

[0073] A specific embodiment of the wastewater treatment system of the second embodiment will be described with reference to Fig. 4. In Fig. 4, reference numerals common to Fig. 1 are omitted. In the following, the wastewater treatment system of the second embodiment will be described, in principle, focusing on the parts that are different from the wastewater treatment system of the first embodiment, and a description of the parts that overlap with the wastewater treatment system of the first embodiment will be omitted.

[0074] The wastewater treatment system 100 includes a wastewater treatment facility 10 having a detection means 130, a treatment tank 60, and a control means 40. For convenience, Fig. 1 illustrates wastewater 11 contained in the wastewater treatment facility 10 and treated water 61 to be treated in the treatment tank 60.

[0075] The drainage equipment 10 has a detection means 130. In this way, the drainage equipment 110 has the detection means 130 that predicts or detects the state of the drainage water 11, the water treatment promoter supply means 20 that supplies a water treatment promoter to the drainage water 11 in the drainage equipment 10, and the drain pipe 50 that extends from the drain outlet 12 and connects to the treatment tank 60. In other words, the drainage equipment 10 is composed of a main body that accommodates the drainage water 11, the detection means 130, the water treatment promoter supply means 20, and the drain pipe 50.

[0076] The detection means 130 is configured to be able to predict or detect the state of the wastewater 11. The detection means 130 is able to detect the presence of a substance to be treated contained in the wastewater 11. In other words, the detection means 130 is able to detect, as a physical quantity, the water quality that changes due to the presence of the substance to be treated in the wastewater 11. The detection means 130 is provided on the right side surface of the recess 13 in the main body of the drainage equipment 10.

[0077] The basic configuration of the detection means 130 is the same as the detection means 30 of the wastewater treatment system 1. However, the detection means 130 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 predict the presence of the material to be treated in the wastewater 11. That is, the detection means 130 can predict the state of the wastewater 11 in the drainage equipment 10. In this case, the detection means 130 may be, for example, a human presence sensor, specifically, a contact-type human presence sensor such as a tactile switch or a piezoelectric element, an infrared sensor, an ultrasonic sensor, a microwave sensor, or a millimeter-wave sensor. Furthermore, the detection means 130 may detect the presence of a physical quantity, such as emitted light or vibration, such as when the lid of the drainage equipment 10 is opened or closed, or may detect the absence of a physical quantity due to the reduction or disappearance of such a physical quantity.

[0078] The detection means 130 may predict and detect the presence of an object to be treated either continuously or intermittently.

[0079] The control means 40 is configured to continuously or intermittently receive a signal from the detection means 130 provided in the drainage equipment 10 as an input value, and to be able to control the treatment tank 60 based on the signal.

[0080] The control means 40 preferably has a processing unit that determines the state of the treated water 61 based on a signal from the detection means 130. 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 5. In Figure 5, reference numerals that are common to Figure 2 have been omitted. However, if the control means 40 emits a signal only when the detection means 130 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 or part or all of the processing unit.

[0081] The processing unit 410 is configured to be able to acquire a signal from the detection means 130 and to be able to issue commands to the treatment tank 60. Furthermore, the input / output unit 430 is configured to be able to transmit a signal from the detection means 130 to the processing unit 410 and to be able to transmit a command to the treatment tank 60 based on the determination result of the processing unit 410. The processing unit 410 determines the state of the wastewater 11 based on the signal from the detection means 130 by comparing it with an index value 421, a past signal history 422, etc., or by using a determination program 423, etc.

[0082] The control means 40, treatment tank 60, and detection means 130 may be independently connected by wire, or may be connected wirelessly with or without a router or the like. It is preferable that the control means 40, treatment tank 60, and detection means 130 are physically separated from each other, but two or all three of these may be configured as an integrated unit 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 treatment tank 60.

[0083] The control means 40 controls the treatment tank 60 based on the signal emitted by the detection means 130 so that the state of the treated water 61 in the treatment tank 60 falls within a predetermined range. For example, if the amount of materials to be treated in the wastewater 11 is high, the control means 40 supplies a water treatment promoter that promotes decomposition of the materials in the treatment tank 60 and / or controls the treatment tank 60 to increase the amount of water received by the treatment tank 60. Furthermore, for example, if the amount of materials to be treated in the wastewater 11 is low, the control means 40 supplies a water treatment promoter that serves as a nutrient for microorganisms to the treated water 61 in the treatment tank 60 and / or controls the treatment tank 60 to discharge the treated water 61 from the treatment tank 60. Furthermore, for example, if the amount of materials to be treated in the treated water 61 falls within a predetermined range, the control means 40 controls the treatment tank 60 so that the water treatment promoter is not supplied.

[0084] The control means 40 may control the treatment tank 60 immediately or with a delay based on the signal from the detection means 130. For example, when the detection means 130 signals that the wastewater 11 has been detected as having a large or small amount of the material to be treated, it is preferable to control the treatment tank 60 immediately. On the other hand, when the detection means 130 signals that the wastewater 11 has been predicted as having a large or small amount of the material to be treated, it is preferable to control the treatment tank 60 with a delay. However, in this case, the treatment tank 60 may be controlled before, or preferably just before, the wastewater 11 reaches a large or small amount of the material to be treated so that the state of the treated water 61 in the treatment tank 60 falls within a predetermined range.

[0085] An example of a method for wastewater treatment using the wastewater treatment system 100 will be described with reference to the flowchart shown in FIG.

[0086] 6 , the detection means 130 of the drainage equipment 10 detects the state of the drainage 11 in the drainage equipment 10, specifically the amount of material to be treated (S201). Next, the detection means 130 sends a different signal to the control means 40 as the detection result depending on the state of the drainage 11 (S202). The control means 40 determines the state of the drainage 11 based on the signal received from the detection means 130 (S203). However, the detection means 130 may be configured not to send any signal to the control means 40 if it does not detect a physical quantity that deviates from a predetermined threshold range.

[0087] If the result of the determination is that the amount of material to be treated in the wastewater 11 is large or small, or if the amount of material to be treated in the wastewater 11 is neither large nor small, the treatment tank 60 is controlled accordingly (S204).

[0088] If the amount of the material to be treated in the wastewater 11 is large or small, the treatment tank 60 is controlled accordingly so that the amount of the material to be treated in the treated water 61 falls within a predetermined range (S205A). On the other hand, if the amount of the material to be treated in the wastewater 11 is neither large nor small, the treatment tank 60 is controlled so that the state of the treated water 61 is maintained (S205B).

[0089] In the wastewater treatment system 100, after controlling the treatment tank 60 (S205A), it is preferable to control the treatment tank 60 by intermittently or continuously detecting the presence of the material to be treated in the wastewater 11 using the detection means 130, or after a predetermined time has elapsed.

[0090] The wastewater treatment system of the second aspect may include other components in addition to the drainage equipment having the detection means, the treatment tank, and the control means, as in the wastewater treatment system of the first aspect.

[0091] [Wastewater Treatment System of Third Aspect] The wastewater treatment system of the third aspect of the present invention includes a drainage facility having a detection means, a treatment tank having a detection means, and a control means.

[0092] A specific embodiment of the wastewater treatment system of the third embodiment is a wastewater treatment system 101 (not shown) that combines the wastewater treatment system 1 and the wastewater treatment system 10 illustrated in Figures 1 and 4. The wastewater treatment system 101 includes a wastewater facility 10 having a detection means 130, a treatment tank 60 having a detection means 30, and a control means 40.

[0093] In the wastewater treatment system 101, the detection means 30 of the treatment tank 60 detects the state of the treated water 61 in the treatment tank 60, the detection means 130 of the drainage equipment 10 predicts or detects the state of the wastewater 11 in the drainage equipment 10, and the control means 40 controls the drainage equipment 10 based on a signal from the detection means of the treatment tank 60 so that the state of the treated water 61 falls within a predetermined range, and also controls the treatment tank 60 based on a signal from the detection means 130 of the drainage equipment 10 so that the state of the treated water 61 in the treatment tank 60 falls within a predetermined range.

[0094] When the control means 40 has a processing unit 410, the processing unit 410 is configured to be able to acquire signals from the detection means 30 and the detection means 130, and to issue commands to the drainage equipment 10 and the treatment tank 60. The input / output unit 430 is configured to be able to transmit signals from the detection means 30 and the detection means 130 to the processing unit 410, and to be able to transmit commands to the drainage equipment 10 and the treatment tank 60 based on the determination results of the processing unit 410.

[0095] The wastewater treatment system 101 is characterized by being able to control the treatment tank 60 in two directions, since it can control the treatment tank 60 in response to a signal from the detection means 130 of the wastewater treatment equipment 10, and can control the wastewater treatment equipment 10 in response to a signal from the detection means 30 of the treatment tank 60. The wastewater treatment system 101 controls the wastewater treatment equipment 10, the treatment tank 60, or both, depending on the state of the treated water 61 in the treatment tank 60 and the state of the wastewater 11 in the wastewater treatment equipment 10, thereby efficiently keeping the state of the treated water 61 within a predetermined range.

[0096] [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. 7 .

[0097] The system toilet 200 comprises a toilet bowl 210 corresponding to the drainage equipment, a hypochlorous acid supply means 220 corresponding to the water treatment promoter supply means, a biological treatment tank 260 having an optical sensor 230 corresponding to the detection means, and a control means 240.

[0098] A user 270 can relieve himself / herself by sitting on a toilet seat 214, which is the seating surface of the toilet bowl 210. The excrement from the user 270, i.e., human waste, is collected in a drain 211 in a recess 213 of the toilet bowl 210.

[0099] In system toilet 200, when user 270 has finished using the toilet, he or she flushes flush water into toilet bowl 210, causing wastewater 211 containing human waste to flow through drain pipe 250 into biological treatment tank 260. Optical sensor 230 disposed in biological treatment tank 260 detects that the state of the treated water in biological treatment tank 260 is not within a predetermined range, for example, when the turbidity of the treated water is too high, and transmits a signal to control means 240. Based on the signal from optical sensor 230, control means 240 controls hypochlorous acid supply means 220 to supply hypochlorous acid into toilet bowl 210.

[0100] The supply of hypochlorous acid by the hypochlorous acid supply means 220 is performed intermittently or continuously, preferably immediately after the optical sensor 230 detects that the state of the treated water in the biological treatment tank 260 is not within a predetermined range. Furthermore, the supply may continue for a while even after the optical sensor 230 detects that the state of the treated water falls within the predetermined range, for example, for several seconds to several tens of seconds after the state of the treated water falls within the predetermined range.

[0101] When hypochlorous acid is supplied to wastewater 211 containing human waste, nitrogen compounds and ammonia nitrogen in the human waste are oxidized and decomposed, and the wastewater 211 can be subjected to biological treatment without placing an excessive load on the downstream biological treatment tank 260. As a result, efficient biological treatment is achieved in the biological treatment tank 260, and the overall wastewater treatment efficiency can be improved.

[0102] Furthermore, from the viewpoint of the mixing efficiency of the human waste and hypochlorous acid, it is preferable that the amount of wastewater 211 stored in recess 213 is small. Therefore, after receiving a signal from optical sensor 230, control means 240 may control system toilet 200 to reduce the amount of wastewater 211, for example by discharging a portion of wastewater 211 stored in recess 213 before the human waste is excreted.

[0103] The optical sensor 230 may be installed in the drainage system 210 as a human presence sensor. In this case, when the human presence sensor 230 detects a user 270 in the system toilet 200, it predicts that human waste will be added to the wastewater 211 and transmits a signal to the control means 240. Based on the signal from the human presence sensor 230, the control means 240 controls the biological treatment tank 60, such as by aerating the biological treatment tank 260, so that the biological treatment of the wastewater in the biological treatment tank 260 is carried out efficiently. The human presence sensor 230 may be a sensor that detects the excretion of human waste by the user 270, or a sensor that detects the opening and closing of the lid of the system toilet 200.

[0104] The timing of control of the biological treatment tank 260 may be immediately after the human presence sensor 230 detects the user 270, or several seconds after detection, for example, while the user 270 is relieving themselves or until they have completely finished relieving themselves. However, in order to efficiently subject the wastewater to biological treatment, it is preferable that the human presence sensor 230 control the biological treatment tank 260 immediately after the user 270 is detected. Furthermore, the system toilet 200 may predict that the lid of the toilet bowl 210 will be opened and that human waste will be added to the wastewater 211, and may control the biological treatment tank 260 in advance before the user 270 excretes human waste, and / or may additionally control the biological treatment tank 260 after the user 270 has finished excreting human waste. For example, the system toilet 200 may control the biological treatment tank 260 when the lid of the toilet bowl 210 is opened, then the user 270 excretes human waste, and then control the biological treatment tank 260 again after the user 270 has finished excreting human waste.

[0105] After the user 270 has finished using the toilet, the human presence sensor 230 may detect this and the control means 240 or other control means may automatically flush water into the toilet bowl 210, or the user 270 may manually flush water into the toilet bowl 110 regardless of the detection status of the human presence sensor 230.

[0106] Another specific embodiment of the wastewater treatment system is a system toilet 201 illustrated in Figure 8. In Figure 8, reference numerals that are the same as those in Figure 7 have been omitted.

[0107] In the system toilet 201, the drainage equipment 210 is equipped with a display means 280, but is not equipped with a hypochlorous acid supply means 220. When the control means 240 detects that the amount of treated material in the treated water in the biological treatment tank 260 is large and is not within a predetermined range, it displays this on the display means 280. Upon seeing this, the user 270 supplies hypochlorous acid to the drainage water 211 after finishing excreting human waste.

[0108] [Application of Wastewater Treatment Systems] A wastewater treatment system may be any system that treats wastewater flowing in from outside the system and then supplies the resulting treated water as purified water to the outside. The wastewater treatment system may be a building wastewater treatment system installed in a residence, small commercial facility, factory plant, temporary facility, etc., or a portable wastewater treatment system. Among wastewater treatment systems, a system that connects to a building's drainage system, treats the wastewater flowing in from the drainage system, and returns the resulting treated water as purified water to the drainage system is called an autonomous circulation water purification system. If the building is a residence, such as a house, the system is called an autonomous circulation residential water purification system. The wastewater treatment system of one embodiment of the present invention is capable of efficient wastewater treatment despite its overall simple configuration, and therefore can be applied to, for example, an autonomous circulation water purification system, preferably a small-scale autonomous circulation water purification system or an autonomous circulation residential water purification system.

[0109] Therefore, a specific preferred embodiment of the wastewater treatment system according to one aspect of the present invention is an autonomous circulation type water purification device that embodies the wastewater treatment system according to one aspect of the present invention.

[0110] Another aspect of the present invention is a wastewater treatment method. The wastewater treatment method of one aspect of the present invention includes a detection step in which a detection means of the treatment tank detects the state of the treated water in the treatment tank, and a drainage equipment control step in which the drainage equipment is controlled so that the state of the treated water falls within a predetermined range based on a signal from the detection means of the treatment tank. The wastewater treatment method of another aspect of the present invention includes a detection step in which a detection means of the drainage equipment predicts or detects the state of the wastewater in the drainage equipment, and a treatment tank control step in which the treatment tank is controlled so that the state of the treated water in the treatment tank falls within a predetermined range based on a signal from the detection means of the drainage equipment. The wastewater treatment method of another aspect of the present invention includes a detection step in which a detection means of the treatment tank detects the state of the treated water in the treatment tank, a detection step in which a detection means of the drainage equipment predicts or detects the state of the wastewater in the drainage equipment, a drainage equipment control step in which the drainage equipment is controlled so that the state of the treated water falls within a predetermined range based on a signal from the detection means of the treatment tank, and a treatment tank control step in which the treatment tank is controlled so that the state of the treated water in the treatment tank falls within a predetermined range based on a signal from the detection means of the treatment tank.

[0111] The wastewater treatment system according to an embodiment of the present invention is preferably implemented by the wastewater treatment system of the present invention.

[0112] The wastewater treatment system of one embodiment of the present invention has a simple overall configuration yet is capable of efficiently treating wastewater, and therefore 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.

[0113] REFERENCE SIGNS LIST 1 wastewater treatment system 10 drainage equipment 11 wastewater 12 drain outlet 13 recess 20 water treatment accelerator supply means 30 detection means 40 control means 410 processing unit 420 memory unit 421 index value 422 signal history 423 judgment program 430 input / output unit 440 bus 50 drain pipe 60 treatment tank CROSS-REFERENCE TO RELATED APPLICATIONS

[0114] This application claims priority from Japanese Patent Application No. 2024-031081, filed March 1, 2024, the entire disclosure of which is incorporated herein by reference. In addition, the entire disclosures of all documents referenced in the detailed description of the invention of this application, including Patent Document 1 and Non-Patent Document 1, are incorporated herein by reference.

Claims

1. A wastewater treatment system comprising: a drainage facility; a treatment tank having a detection means; and a control means, wherein the treatment tank is capable of receiving wastewater discharged from the drainage facility; the detection means of the treatment tank predicts or detects the state of the treated water in the treatment tank; and the control means controls the drainage facility based on a signal from the detection means of the treatment tank so that the state of the treated water falls within a predetermined range.

2. A wastewater treatment system comprising: a drainage facility having a detection means; a treatment tank; and a control means, wherein the treatment tank is capable of receiving wastewater discharged from the drainage facility; the detection means of the drainage facility predicts or detects the state of the wastewater in the drainage facility; and the control means controls the treatment tank based on a signal from the detection means of the drainage facility so that the state of the treated water in the treatment tank falls within a predetermined range.

3. A wastewater treatment system comprising: a drainage facility having a detection means; a treatment tank having a detection means; and a control means, wherein the treatment tank is capable of receiving wastewater discharged from the drainage facility; the detection means of the treatment tank predicts or detects the state of the treated water in the treatment tank; the detection means of the drainage facility predicts or detects the state of the wastewater in the drainage facility; and the control means controls the drainage facility based on a signal from the detection means of the treatment tank so that the state of the treated water falls within a predetermined range, and also controls the treatment tank based on a signal from the detection means of the drainage facility so that the state of the treated water in the treatment tank falls within a predetermined range.

4. A wastewater treatment system according to claim 1 or 3, wherein the control of the drainage facility is the supply of water to the drainage facility or the supply of a water treatment promoter to the drainage facility.

5. A wastewater treatment system according to claim 2 or 3, wherein the control of the treatment tank is the discharge of treated water from the treatment tank or the supply of water or a water treatment promoter to the treatment tank.

6. The wastewater treatment system according to claim 4, wherein the water treatment promoter is a water treatment promoter that decomposes or neutralizes inorganic or organic substances, or a water treatment promoter that is a nutrient component or disinfectant component for microorganisms.

7. A wastewater treatment system as described in claim 1 or 3, wherein the detection means of the treatment tank predicts or detects at least one state of the treated water selected from the group consisting of the water pressure, water volume, water level, water temperature, pH, electrical conductivity, odor, color, and turbidity of the treated water, as well as the amount of microorganisms in the treated water, and the presence of inorganic and organic matter.

8. A wastewater treatment system according to claim 2 or 3, wherein the detection means of the wastewater treatment facility predicts the state of the treated water based on the source of the material to be treated, or predicts or detects 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 presence of inorganic and organic matter in the wastewater.

9. A wastewater treatment method comprising: a detection step in which a detection means of the treatment tank predicts or detects the state of the treated water in the treatment tank; and a drainage equipment control step in which a drainage equipment is controlled based on a signal from the detection means of the treatment tank so that the state of the treated water falls within a predetermined range.

10. A wastewater treatment method comprising: a detection step in which a detection means of the drainage equipment predicts or detects the state of wastewater in the drainage equipment; and a treatment tank control step in which the treatment tank is controlled based on a signal from the detection means of the drainage equipment so that the state of the treated water in the treatment tank falls within a predetermined range.

11. A wastewater treatment method comprising: a detection step in which a detection means of the treatment tank detects the state of treated water in the treatment tank; a detection step in which a detection means of the drainage equipment predicts or detects the state of wastewater in the drainage equipment; a drainage equipment control step in which the drainage equipment is controlled based on a signal from the detection means of the treatment tank so that the state of the treated water falls within a predetermined range; and a treatment tank control step in which the treatment tank is controlled based on a signal from the detection means of the drainage equipment so that the state of the treated water in the treatment tank falls within a predetermined range.

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