Water treatment methods

Abstract

This suppresses interference with the treatment process caused by foaming within the treatment tank. [Solution] The water treatment method involves supplying water to the treatment tank in such a way that the amount of water supplied to the treatment tank is 10% or less of the amount of water stored in the treatment tank before the supply of water.

Description

Technical Field

[0001] The present disclosure relates to a water treatment method.

Background Art

[0002] Patent Document 1 describes a wastewater treatment apparatus having a treatment status determination device that determines the treatment status of a biological treatment tank based on the distribution of the oxygen consumption rate of the mixture of sludge and wastewater at multiple locations in the biological treatment tank. In this wastewater treatment apparatus, the activity and quantity of microorganisms in the biological treatment tank and the load amount of wastewater flowing into the biological treatment tank are adjusted based on the determination result of the treatment status determination device.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] For example, the water to be treated in various treatment tanks such as biological treatment tanks may contain surfactants and detergent components. And, foams may be generated in the treatment tank due to these components, and it is desirable to suppress the decrease in the progress of the treatment due to foaming. Further, not limited to the case where foaming occurs in the treatment tank like this, for example, the progress of the treatment may decrease even when the water quality fluctuates greatly in the treatment tank.

[0005] An object of the present disclosure is to suppress the interference of the treatment due to foaming in the treatment tank.

Means for Solving the Problems

[0006] In the water treatment method of the technology of the present disclosure, the supply amount of the supply water supplied to the treatment tank is such that the supply water is supplied to the treatment tank so as to be 10% or less of the storage amount of the water in the treatment tank stored in the treatment tank before the supply water is supplied.

[0007] Furthermore, in the water treatment method of the technology of this disclosure, the amount of water filtered in the treatment tank is adjusted so that the amount of water filtered in the treatment tank is 10% or less of the amount of water stored in the treatment tank. [Effects of the Invention]

[0008] The technology disclosed herein can suppress interference with the treatment process caused by foaming within the treatment tank. [Brief explanation of the drawing]

[0009] [Figure 1] Figure 1 shows the overall configuration of a water circulation system in which the disclosed water treatment method is implemented. [Modes for carrying out the invention]

[0010] The first embodiment will be described below with reference to the drawings.

[0011] Figure 1 shows the overall configuration of a water circulation system 12 relating to the technology of this disclosure. This water circulation system 12 is a system that purifies and recycles wastewater used in a household, making it reusable within the household. Examples of wastewater include water used in household water usage areas 14, such as the kitchen, washroom, bathroom, bidet toilet seat, toilet, washing machine, etc. The water circulation system 12 is an example of a system in which the water treatment method of the disclosed technology is implemented.

[0012] The water circulation system 12 includes a wastewater adjustment tank 100, a biological treatment tank 300, and a treated water storage tank 400. Wastewater discharged from the water usage points 14 is circulated back to the water usage points 14 after passing through the wastewater adjustment tank 100, the biological treatment tank 300, and the treated water storage tank 400 in that order.

[0013] The water usage point 14 and the drainage adjustment tank 100 are connected by a drainage pipe 102. The wastewater generated at the water usage point 14 is sent to the drainage adjustment tank 100 through the drainage pipe 102.

[0014] In the wastewater adjustment tank 100, the wastewater is stored inside while predetermined treatments such as agitation are performed on the wastewater. The gas inside the wastewater adjustment tank 100 may be discharged to the outside of the wastewater adjustment tank 100, for example, by driving a fan.

[0015] The wastewater adjustment tank 100 and the biological treatment tank 300 are connected by a drainage pipe 302. The wastewater adjustment tank 100 is equipped with a supply pump 110. The wastewater from the wastewater adjustment tank 100 is sent to the biological treatment tank 300 through the drainage pipe 302 by the drive of the supply pump 110 and is stored in the biological treatment tank 300 as biological treatment tank water. The supply pump 110 is controlled by a control device 900. The wastewater sent from the wastewater adjustment tank 100 to the biological treatment tank 300 is an example of the treated water of the disclosed technology and is also an example of the supply water.

[0016] In the biological treatment tank 300, predetermined treatments such as biological treatment are performed on the biological treatment tank water while maintaining a state of storage inside the biological treatment tank water. Biological treatment is an example of the treatment performed in the biological treatment tank 300 in the disclosed technology. The biological treatment tank 300 is an example of a treatment tank in the disclosed technology. The biological treatment tank water is an example of treatment tank water in the disclosed technology. The gas inside the biological treatment tank 300 may be discharged to the outside of the biological treatment tank 300, for example, by driving a fan.

[0017] A filtration device 306 is provided inside the biological treatment tank 300. The water inside the biological treatment tank can be filtered by the filtration device 306. Filtration of the water inside the biological treatment tank by the filtration device 306 is an example of the treatment performed in the biological treatment tank 300 in the disclosed technology.

[0018] A water level gauge 308 is installed in the biological treatment tank 300. The water level gauge 308 measures the water level in the biological treatment tank 300. Based on the measurement results, the amount of wastewater supplied from the wastewater adjustment tank 100 to the biological treatment tank 300 is adjusted.

[0019] The biological treatment tank 300 and the treated water storage tank 400 are connected by a treated water pipe 402. A treated water pump 406 is provided in the treated water pipe 402. By driving the treated water pump 406, the water inside the biological treatment tank in the biological treatment tank 300 is sent to the treated water storage tank 400 and stored as treated water in the treated water storage tank 400. The treated water pump 406 is controlled by a control device 900. By controlling the treated water pump 406, the filtration amount of the water inside the biological treatment tank filtered by the filtration device 306, that is, the amount of treated water sent from the biological treatment tank 300 to the treated water storage tank 400, can be adjusted.

[0020] Also in the treated water storage tank 400, while maintaining the state of storing the treated water inside, predetermined treatment is performed on this treated water. The gas inside the treated water storage tank 400 may be discharged to the outside of the treated water storage tank 400, for example, by driving a fan.

[0021] The treated water storage tank 400 and each water usage location 14 are connected by a supply pipe 716. A supply pump 724 is provided in the supply pipe 716. The treated water inside the treated water storage tank 400 is sent to each water usage location 14 through the supply pipe 716 by driving the supply pump 724. The supply pump 724 is controlled by a control device 900. In practice, the supply pipe 716 may branch toward each water usage location 14.

[0022] Next, the water treatment method of this embodiment will be described.

[0023] The wastewater generated at the water usage location 14 passes through the wastewater adjustment tank 100 and is stored as water inside the biological treatment tank in the biological treatment tank 300 and biologically treated. The water inside the biological treatment tank biologically treated in the biological treatment tank 300 is stored as treated water in the treated water storage tank 400 and then returned to the water usage location 14.

[0024] In this embodiment, predetermined water in the biological treatment tank 300 is stored. The water level of the water in the biological treatment tank 300 stored in the biological treatment tank 300 is measured by a water level gauge 308. Further, by driving the supply pump 110, drainage (supply water) is supplied from the drainage adjustment tank 100 to the biological treatment tank 300.

[0025] The control device 900 controls the supply pump 110 so that the supply amount of the drainage (supply water) supplied to the biological treatment tank 300 is 10% or less of the storage amount of the water in the biological treatment tank 300 stored in the biological treatment tank 300.

[0026] For example, when the water in the biological treatment tank 300 treated in the biological treatment tank 300 is sent to the treated water storage tank 400, the amount of the water in the biological treatment tank 300 stored in the biological treatment tank 300 decreases. The water level gauge 308 measures the water level of the water in the biological treatment tank 300 stored in the biological treatment tank 300 in a state where the water supply from the biological treatment tank 300 to the treated water storage tank 400 has stopped. When the control device 900 knows from the measurement data by the water level gauge 308 that the amount of the water in the biological treatment tank 300 inside the biological treatment tank 300 has decreased, the control device 900 drives the supply pump 110 and sends the drainage inside the drainage adjustment tank 100 to the biological treatment tank 300.

[0027] Note that the supply of the drainage to the biological treatment tank 300 by driving the supply pump 110 is performed in a state where the water in the biological treatment tank 300 of the biological treatment tank 300 is not sent to the treated water storage tank 400.

[0028] In the treatment in the biological treatment tank 300, the water in the biological treatment tank may contain a foaming component. For example, when soap, detergent, surfactant, etc. are used at the water usage location 14, these foaming components are contained in the drainage. And when this drainage is sent to the biological treatment tank 300, the water in the biological treatment tank 300 inside the biological treatment tank 300 contains a foaming component.

[0029] In this embodiment, the amount of supply water supplied to the biological treatment tank 300 is suppressed, thereby suppressing interference with treatment due to abnormal foaming in the biological treatment tank 300 and enabling stable treatment. Abnormal foaming can be indirectly detected by monitoring pressure changes within the biological treatment tank 300. These pressure changes can be detected, for example, by using a pressure-type water level gauge as the water level gauge 308, and abnormal foaming can be detected when the water level gauge shows an abnormal value. In particular, by limiting the amount of wastewater (supply water) supplied to the biological treatment tank 300 to 10% or less of the amount of water stored in the biological treatment tank 300, abnormal foaming in the biological treatment tank 300 can be effectively suppressed compared to the case where it exceeds 10%. Furthermore, by suppressing and leveling excessive fluctuations in water quality within the biological treatment tank 300, continuous treatment becomes possible. For example, if the amount of wastewater (supply water) supplied to the biological treatment tank 300 exceeds 20% of the amount of water stored in the biological treatment tank 300, it may affect the water quality. Furthermore, even if this percentage is 20% or less, if it exceeds 10%, the water quality will change significantly. In contrast, if this percentage is 10% or less, large changes in water quality can be suppressed, and abnormal foaming can be prevented without adding defoaming agents or other substances.

[0030] Furthermore, in this embodiment, in the biological treatment tank 300, the water inside the biological treatment tank is filtered by the filtration device 306 when the treated water pump 406 is driven. The amount of water filtered by the filtration device 306 is adjusted to be 10% or less of the amount of water stored in the biological treatment tank 300. This also suppresses abnormal foaming in the biological treatment tank 300 and further suppresses fluctuations in water quality due to environmental changes in the biological treatment tank 300, compared to the case where the amount filtered exceeds 10% of the water inside the biological treatment tank 300. For example, even if there are large fluctuations in water quality due to the source of the wastewater stored in the wastewater adjustment tank 100, these fluctuations in water quality do not affect the water inside the biological treatment tank 300, and fluctuations in the water quality of the water inside the biological treatment tank can be suppressed. As a result, the treatment inside the biological treatment tank 300 can be stabilized.

[0031] Furthermore, in this embodiment, the control device 900 can control the supply pump 110 and the treated water pump 406 so that the amount of water stored in the biological treatment tank 300 remains within a certain range. For example, when the treated water pump 406 drives the water stored in the biological treatment tank 300 to the treated water storage tank 400, the amount of water stored in the biological treatment tank 300 decreases. When the control device 900 recognizes from the measurement data transmitted from the water level gauge 308 that the amount of water in the biological treatment tank 300 has decreased, it drives the supply pump 110 to send the wastewater from inside the wastewater adjustment tank 100 to the biological treatment tank 300. As a result, the amount of water stored in the biological treatment tank 300 remains within a certain range without decreasing excessively. And by keeping the amount of water stored in the biological treatment tank 300 within a certain range, abnormal foaming and water quality fluctuations in the biological treatment tank 300 are suppressed.

[0032] This "certain range" is, for example, a range of 90% to 100% of the pre-set storage volume of water in the biological treatment tank 300. This effectively suppresses abnormal foaming and water quality fluctuations within the biological treatment tank 300 compared to when the storage volume of water in the biological treatment tank 300 fluctuates by more than -10%.

[0033] As an example of the treatment tank of the disclosed technology, a biological treatment tank 300 was given above, but the treatment tank is not limited to the biological treatment tank 300. For example, an ozone treatment tank, a chlorine treatment tank, and a UV (ultraviolet) irradiation treatment tank can be given as treatment tanks. In this case, the water stored in the ozone treatment tank, chlorine treatment tank, and UV irradiation treatment tank, respectively, is the water in the treatment tank.

[0034] Furthermore, the following additional information is disclosed. (Note 1) A water treatment method comprising supplying water to a treatment tank such that the amount of water supplied to the treatment tank is 10% or less of the amount of water stored in the treatment tank before the supply of the water. (Note 2) A water treatment method comprising adjusting the amount of water filtered in a treatment tank so that the amount of water filtered in the treatment tank is 10% or less of the amount of water stored in the treatment tank. (Note 3) A water treatment method according to Appendix 1 or Appendix 2, wherein the storage volume is adjusted to a certain range. [Explanation of Symbols]

[0035] 12 Water Circulation System 14 Water usage locations 100 Drainage adjustment tank 102 Drainage piping 110 Supply pump 300 Biological treatment tanks 302 Drainage piping 306 Filtration device 308 Water level gauge 400 treated water storage tank 402 Treated water piping 406 Treated water pump 716 Supply piping 724 Supply pump 900 Control Unit

Claims

1. A water treatment method comprising supplying water to a treatment tank such that the amount of water supplied to the treatment tank is 10% or less of the amount of water stored in the treatment tank before the supply of the water.

2. A water treatment method comprising adjusting the amount of water filtered in a treatment tank so that the amount of water filtered in the treatment tank is 10% or less of the amount of water stored in the treatment tank.

3. The water treatment method according to claim 1 or claim 2, wherein the amount of storage is adjusted to a certain range.

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