JP2021100746A - Water treatment system and water treatment method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a water treatment system which is advantageous in terms of cost while maintaining purification performance. A water treatment system 1 includes a primary water storage tank 10, a water purification device 12, a secondary water storage tank 14, a cleaning pipe 54, and a switching unit 32. The water purification device 12 includes a circulation pipe 30 for circulating water including raw water, and a plurality of parallel pipes 31 connected to the circulation pipe 30. The water purification device 12 is installed in each of the parallel pipes 31, and is installed in a plurality of water pumps 40 for pumping and sending raw water from the primary water tank 10 and in a circulation pipe 30 so as to be parallel to the cleaning pipe 54 to supply the raw water. A filtration tank 43 for filtering is provided. In the switching unit 32, the filtered water generated in the filtration tank 43 goes to the primary water storage tank 10, the filtered water generated in the filtration tank 43 goes to the secondary water storage tank 14, or passes through the cleaning pipe 54. The flow path is switched so that the generated water goes to the filtration tank 43. [Selection diagram] Fig. 1

Description

The present disclosure relates to water treatment systems and methods.

Conventionally, there is a water treatment system that purifies raw water, which is water from a water source such as a well, river or pond, or rainwater, for use as drinking water or domestic water. Patent Document 1 includes a primary water tank used for storing and purifying raw water and a secondary water tank for storing purified water, and the raw water stored in the primary water tank is used as a water purification device. It discloses a water purification system that improves purification efficiency by circulating and purifying water between them.

JP-A-2009-95822

A water treatment system as shown in Patent Document 1 is particularly useful in developing countries where water supply facilities are not sufficiently equipped. However, when applying such a water treatment system to ordinary houses in developing countries, not only purification performance but also costs at the time of introduction and use are important. Here, if the water treatment system is applied to only one house, one house may not be able to cover the cost, or if the operating time is short, the system itself may be over-engineered. On the other hand, in order to obtain an advantage in terms of cost, it is conceivable to distribute water purified by one water treatment system to a plurality of houses. However, when a plurality of houses are covered by one water treatment system, there is a concern that the load on the pump, for example, may increase due to the long operating time. Attempts to adopt, for example, highly durable pumps to cope with the increased load on the pumps can result in increased costs and require further improvements in the water treatment system. Further, if the backflow cleaning mechanism of the filtration tank is provided so that the purification performance does not deteriorate with the operating time of the water treatment system, the piping configuration becomes complicated and the cost may be further increased.

The present disclosure has been made in view of the problems of the prior art. An object of the present disclosure is to provide a water treatment system and a water treatment method which are advantageous in terms of cost while maintaining purification performance.

In order to solve the above problems, the water treatment system according to one aspect of the present disclosure includes a primary water storage tank for storing raw water, a water purification device for purifying raw water by circulating it between the primary water storage tanks, and a water purification device. It is equipped with a secondary water storage tank that stores purified water purified by, a cleaning pipe, and a switching unit. The water purification device is a circulation pipe that circulates water containing raw water and a plurality of parallel pipes that are connected to the circulation pipe. Multiple water pumps that are installed in each of the parallel pipes to pump and send raw water from the primary water tank, and a filter tank that is installed in the circulation pipe so that it is parallel to the cleaning pipe and filters the raw water, and the switching unit , So that the filtered water generated in the filter tank goes to the primary water tank, the filtered water generated in the filter tank goes to the secondary water tank, or the water that has passed through the cleaning pipe goes to the filter tank. Switch the flow path.

In addition, the water treatment method according to one aspect of the present disclosure is between a primary water storage step in which raw water is stored in a primary water storage tank and a water purification device including a primary water storage tank and a filtration tank for collecting raw water stored in the primary water storage step. A purification process that circulates and purifies, a secondary water storage process that stores the purified water purified in the purification process in a secondary water storage tank, and a cleaning process that cleans the filter tank by passing water containing raw water through the cleaning pipe. In the purification process, multiple water pumps installed in each of the multiple parallel pipes connected to the circulation pipe that circulates the raw water pumps the raw water from the primary water tank and sends it to the cleaning pipe. Raw water is filtered by passing through the filter tanks installed in the circulation pipe so that they are in parallel, and in the purification process, the flow path is switched so that the filtered water generated in the filter tank goes to the primary water storage tank. In the secondary water storage process, the flow path is switched so that the filtered water generated in the filtration tank goes to the secondary water storage tank, and in the cleaning step, the flow path so that the water that has passed through the cleaning pipe goes to the filtration tank. Is switched.

According to the present disclosure, it is possible to provide a water treatment system and a water treatment method that are advantageous in terms of cost while maintaining purification performance.

It is the schematic of the water treatment system which concerns on 1st Embodiment of this disclosure. It is a control block diagram which concerns on a control part. It is a flowchart which shows the flow of the water treatment process in a water treatment system. It is a flowchart which shows the flow of the primary water storage process included in a water treatment process. It is a flowchart which shows the flow of the purification process included in the water treatment process. It is a flowchart which shows the flow of the secondary water storage process included in a water treatment process. It is a flowchart which shows the flow of the cleaning process included in the water treatment process. It is a schematic diagram which shows the flow of water in a purification process in the water treatment system which concerns on 1st Embodiment. It is a schematic diagram which shows the flow of water in the secondary water storage process in the water treatment system which concerns on 1st Embodiment. It is a schematic diagram which shows the flow of water in a washing process in the water treatment system which concerns on 1st Embodiment. It is a schematic diagram which shows the flow of water in a purification process in the water treatment system which concerns on 2nd Embodiment. It is a schematic diagram which shows the flow of water in the secondary water storage process in the water treatment system which concerns on 2nd Embodiment. It is a schematic diagram which shows the flow of water in a washing process in the water treatment system which concerns on 2nd Embodiment.

Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings.

[First Embodiment]
FIG. 1 is a schematic view of the water treatment system 1 according to the first embodiment. The water treatment system 1 purifies the raw water as the water to be treated to the extent that it can be used as domestic water, for example. Here, the raw water means water from a water source such as a well, a river or a pond, or rainwater. In the following description, it is assumed that the raw water is well water as an example. Further, the water purified by the water purification device 12 described later is referred to as purified water.

Further, the water treatment system 1 supplies purified water to a plurality of houses 200. In particular, the water treatment system 1 is suitable for supplying purified water to a medium-scale supply range in which several to several tens of houses 200 exist. In FIG. 1, as an example, it is assumed that the water treatment system 1 supplies purified water to 10 houses 200 from the houses 200a to the houses 200j.

The water treatment system 1 includes a primary water tank 10, a water purification device 12, a secondary water tank 14, a control unit 16, a cleaning pipe 54, and a drain pipe 55.

The primary water tank 10 stores raw water pumped from underground. However, since the raw water is circulated with the water purification device 12 and gradually purified, the proportion of purified water in the primary water tank 10 becomes larger than that of the raw water as the purification treatment by the water purification device 12 progresses. .. As elements related to the primary water tank 10, the water treatment system 1 includes a pumping pipe 20, a pumping pump 21, and a first water level sensor 22. The pumping pipe 20 pumps raw water from the raw water supply source 100 to the primary water tank 10. One end of the pumping pipe 20 is inserted into the supply source 100, and the other end is opened toward the inside of the primary water tank 10. The pump 21 is installed in the pumping pipe 20 and is a power source for pumping raw water from the supply source 100. The first water level sensor 22 detects the water level of the water stored in the primary water tank 10. The first water level sensor 22 can detect, for example, two water levels, a high water level indicated by a solid line in the figure and a low water level indicated by a dotted line in the figure.

The water purification device 12 purifies by circulating raw water with the primary water tank 10. The water purification device 12 includes a circulation pipe 30 and a plurality of parallel pipes 31 as a piping system. Further, the water treatment system 1 includes a first switching unit 32 and a second switching unit 33. At least a part of the first switching part 32 and at least a part of the second switching part 33 are installed in the circulation pipe 30.

The circulation pipe 30 circulates water containing raw water. One end of the circulation pipe 30 is connected to the primary water tank 10 as a water inlet of the water purification device 12, and the other end is opened toward the inside of the primary water tank 10 as a circulating water discharge port of the water purification device 12. ..

The plurality of parallel pipes 31 are arranged in parallel with each other at an intermediate position of the circulation pipe 30, and each of the water circulating in the circulation pipe 30 is circulated. The number of parallel pipes 31 depends on the number of water supply pumps 40 installed, which will be described later. In this embodiment, as an example, five water supply pumps 40 are adopted. In this case, there are five plurality of parallel pipes 31, a first parallel pipe 31a, a second parallel pipe 31b, a third parallel pipe 31c, a fourth parallel pipe (not shown), and a fifth parallel pipe 31e.

In the first switching unit 32, the filtered water generated in the filtration tank 43, which will be described later, goes to the primary water storage tank 10, the filtered water generated in the filtration tank 43 goes to the secondary water storage tank 14, or the cleaning pipe. The flow path is switched so that the water that has passed through the inside of the 54 goes to the filtration tank 43. Specifically, the first switching unit 32 includes a first two-way valve 32a installed in the circulation pipe 30 between the connection portion between the circulation pipe 30 and the lead-out pipe 50 and the primary water storage tank 10, and the lead-out pipe 50. The second two-way valve 32b installed in the cleaning pipe 54 and the third two-way valve 32c installed in the cleaning pipe 54 are included. The first two-way valve 32a, the second two-way valve 32b, and the third two-way valve 32c switch the flow path of water in the pipe by opening and closing the valve. The first two-way valve 32a, the second two-way valve 32b, and the third two-way valve 32c are solenoid valves, and the switching operation of the first switching unit 32 is controlled by the control unit 16.

At least a part of the second switching unit 33 is installed in the circulation pipe 30 between the plurality of parallel pipes 31 and the filtration tank 43. In the second switching unit 33, the water sent by the plurality of water pumps 40 goes to the filtration tank 43 without going through the washing pipe 54, or the water sent by the plurality of water pumps 40 goes through the washing pipe 54. The flow path is switched so as to go to the filtration tank 43. Specifically, the second switching unit 33 is a fourth two-way valve 33a installed in the circulation pipe 30 between the plurality of parallel pipes 31 and the filtration tank 43, and a fifth second way valve 33a installed in the drainage pipe 55. Includes a square valve 33b. The fourth two-way valve 33a and the fifth two-way valve 33b switch the flow path of water in the pipe by opening and closing the valve. Further, the fourth two-way valve 33a and the fifth two-way valve 33b are solenoid valves, and the switching operation of the second switching unit 33 is controlled by the control unit 16.

Further, the water purification device 12 includes a water supply pump 40, a check valve 41, and a flow rate sensor 42 as elements installed in each of the parallel pipes 31. That is, there are a plurality of water supply pumps 40, check valves 41, and flow rate sensors 42, respectively.

The water supply pump 40 is a power source for pumping and sending raw water from the primary water tank 10. When the water purification supply range of the water treatment system 1 is medium-sized, if only one water pump 40 is installed in the water purification device 12, the water pump 40 is required to have high durability, for example. .. On the other hand, in the present embodiment, since a plurality of water supply pumps 40 are installed in the water purification device 12, each water supply pump 40 does not necessarily need to have high durability. Further, the operation of the plurality of water pumps 40 is controlled by the control unit 16, respectively.

In this embodiment, there are five water supply pumps 40 as an example. The water supply pump 40 installed in the first parallel pipe 31a is the first water supply pump 40a. Similarly, the water supply pump 40 installed in the second parallel pipe 31b is the second water supply pump 40b. The water supply pump 40 installed in the third parallel pipe 31c is the third water supply pump 40c. The water supply pump 40 installed in the fifth parallel pipe 31e is the fifth water supply pump 40e.

The check valve 41 is installed on the downstream side of the water supply pump 40 for each parallel pipe 31, and suppresses the backflow of water from the downstream side to the upstream side in the parallel pipe 31.

In this embodiment, there are five check valves 41 according to the number of water supply pumps 40 installed. The check valve 41 installed in the first parallel pipe 31a is the first check valve 41a. Similarly, the check valve 41 installed in the second parallel pipe 31b is the second check valve 41b. The check valve 41 installed in the third parallel pipe 31c is the third check valve 41c. The check valve 41 installed in the fifth parallel pipe 31e is the fifth check valve 41e.

The flow rate sensor 42 is installed on the downstream side of the water supply pump 40 for each parallel pipe 31, and detects the flow rate of water flowing through the parallel pipe 31. In the present embodiment, the flow rate sensor 42 has a role as an abnormality detection unit for detecting an abnormality in the water supply pump 40. Further, when the check valve 41 is installed for each of the parallel pipes 31 as in the example of the present embodiment, the check valve 41 is installed on the downstream side of the water supply pump 40.

In this embodiment, there are five flow rate sensors 42 according to the number of water supply pumps 40 installed. The flow rate sensor 42 installed in the first parallel pipe 31a is the first flow rate sensor 42a. Similarly, the flow rate sensor 42 installed in the second parallel pipe 31b is the second flow rate sensor 42b. The flow rate sensor 42 installed in the third parallel pipe 31c is the third flow rate sensor 42c. The flow rate sensor 42 installed in the fifth parallel pipe 31e is the fifth flow rate sensor 42e.

Further, the water purification device 12 includes a filtration tank 43 and an ozone injection unit 44 as a purification mechanism.

The filtration tank 43 filters the raw water. The filtration method is not particularly limited, but the filtration tank 43 may contain, for example, manganese sand as a filter medium. The filtration tank 43 is arranged in the circulation pipe 30 so as to be parallel to the cleaning pipe 54. In the present embodiment, the filtration tank 43 is a part of the circulation pipe 30 in which the plurality of parallel pipes 31 merge on the downstream side, and one is installed on the upstream side of the first switching unit 32. Here, a part of the circulation pipe 30 in which the plurality of parallel pipes 31 merge on the downstream side is the circulation pipe 30 on the side connected to the first switching portion 32 side of the connection portions with the plurality of parallel pipes 31. Refers to a part of. That is, in the present embodiment, in the water purification device 12, the number of installations of the filtration tank 43 is smaller than the number of installations of the water supply pump 40.

The ozone injection unit 44 is installed on the downstream side of the filtration tank 43 in the circulation pipe 30, and injects ozone as an oxidizing agent into the water that has passed through the filtration tank 43. Although not shown, the ozone injection unit 44 includes, for example, an ozone generator that uses a high voltage to generate ozone. The ozone injection unit 44 injects ozone generated by the ozone generator into the water circulating in the circulation pipe 30. Specifically, the ozone injection unit 44 may be a Venturi pipe installed in the circulation pipe 30. Alternatively, the ozone injection unit 44 may be an air pump that disperses ozone-containing air as fine bubbles in water from a porous member installed in the circulation pipe 30.

The secondary water storage tank 14 stores purified water purified by the water purification device 12. As elements related to the secondary water storage tank 14, the water treatment system 1 includes a lead-out pipe 50, a water distribution pipe 51, a water distribution pump 52, and a second water level sensor 53. The lead-out pipe 50 leads out purified water from the water purification device 12 to the secondary water storage tank 14. One end of the lead-out pipe 50 is connected to the second two-way valve 32b (first switching unit 32) in the water purification device 12, and the other end is opened toward the inside of the secondary water storage tank 14. The water distribution pipe 51 distributes purified water from the secondary water tank 14 to each house 200. One end of the water distribution pipe 51 is connected to the secondary water storage tank 14, and the other end is branched and connected to each house. The water distribution pump 52 is installed in the water distribution pipe 51 and is a power source that sucks purified water from the secondary water storage tank 14 and distributes the water to each house side. The second water level sensor 53 detects the water level of purified water stored in the secondary water storage tank 14. The second water level sensor 53 can detect, for example, two water levels, a high water level indicated by a solid line in the figure and a low water level indicated by a dotted line in the figure.

The cleaning pipe 54 is a pipe for sending the water stored in the primary water storage tank 10 to the filtration tank 43 as cleaning water when cleaning the filtration tank 43. The cleaning pipe 54 is arranged in parallel with the filtration tank 43. One end of the cleaning pipe 54 is connected between the plurality of water supply pumps 40 and the filtration tank 43, and the other end is connected to the circulation pipe 30 between the connection portion between the circulation pipe 30 and the outlet pipe 50 and the filtration tank 43. Will be done. Specifically, one end of the washing pipe 54 is connected to a confluence point where it joins the circulation pipes 30 downstream of the plurality of parallel pipes 31 as a water introduction port for washing water, and the other end is used as a water discharge port for washing water. It is connected to the circulation pipe 30. From the connection portion between the circulation pipe 30 and the outlet pipe 50 to the filtration tank 43, the connection portion between the circulation pipe 30 and the outlet pipe 50 and the filtration tank 43 are included.

The drainage pipe 55 drains the water that has passed through the filtration tank 43 through the cleaning pipe 54. The drainage pipe 55 drains the washing water that has washed the filtration tank 43 from the circulation pipe 30. One end of the drainage pipe 55 is connected to the circulation pipe 30 between the plurality of parallel pipes 31 and the filtration tank 43 as a water inlet for water after cleaning. The other end of the drain pipe 55 is connected to a sewer or the like as a water discharge port for washing water.

FIG. 2 is a control block diagram related to the control unit 16. The control unit 16 controls the operation of the entire water treatment system 1 based on various information. The control unit 16 includes a CPU (Central Processing Unit) 60, a ROM (Read Only Memory) 61, and a RAM (Random Access Memory) 62.

A power switch 64, an information input unit 65, a first water level sensor 22, a second water level sensor 53, and a plurality of flow rate sensors 42 are connected to the input side of the control unit 16. On the other hand, a pump 21, a plurality of water pumps 40, an ozone injection unit 44, a first switching unit 32, a second switching unit 33, and a display unit 66 are connected to the output side of the control unit 16. Note that these connections may be wired or wireless.

The power switch 64 is a switch for setting on / off of the entire water treatment system 1. The power switch 64 may be installed in a part of the water purification device 12.

The information input unit 65 is a device for an operator to input various information related to the operation of the water treatment system 1. The information input unit 65 may be a keyboard or a touch panel. In the present embodiment, the operator can input, for example, the circulation time to the information input unit 65. When the information input unit 65 is a touch panel type input unit, it may also be used as the display unit 66 described later.

The display unit 66 displays the operating status of the entire water treatment system 1. The display unit 66 may be, for example, always installed on an indoor wall, or may be a portable tablet type having a communication function.

Next, the specific operation of the water treatment system 1 will be described.

FIG. 3 is a flowchart showing the flow of the water treatment process in the water treatment system 1. The water treatment step in the present embodiment includes a primary water storage step S101, a purification step S102, a secondary water storage step S103, a water distribution step S104, and a cleaning step S105. The primary water storage step S101 is a step of storing raw water in the primary water storage tank 10. The purification step S102 is a step of circulating and purifying the raw water stored in the primary water storage step S101 between the primary water storage tank 10 and the water purification device 12 including the filtration tank 43. The secondary water storage step S103 is a step of storing the purified water purified in the purification step S102 in the secondary water storage tank 14. Further, the water distribution step S104 is a step of distributing the purified water stored in the secondary water storage step S103 from the secondary water storage tank 14 to each house 200. The cleaning step S105 is a step of passing water containing raw water through the cleaning pipe 54 to clean the filtration tank 43. The water treatment process is started when the operator turns on the power switch 64.

FIG. 4 is a flowchart showing the flow of the primary water storage step S101. When the primary water storage step S101 is started, first, the control unit 16 determines whether the raw water in the primary water storage tank 10 is below the low water level, that is, whether the first water level sensor 22 emits a predetermined low water level signal. Is determined (step S201).

Here, when the control unit 16 determines in step S201 that the first water level sensor 22 is emitting a low water level signal (YES), the control unit 16 then starts the operation of the pump 21 to start the operation from the supply source 100. The raw water is pumped up and stored in the primary water tank 10 (step S202). Next, the control unit 16 determines whether the raw water in the primary water tank 10 exceeds the high water level, that is, whether the first water level sensor 22 emits a predetermined high water level signal (step S203). Then, when the control unit 16 determines in step S203 that the first water level sensor 22 is emitting a high water level signal (YES), the control unit 16 stops the operation of the pump 21 (step S204), and performs the primary water storage step. finish.

On the other hand, when the control unit 16 determines in step S201 that the first water level sensor 22 does not emit a low water level signal (NO), the control unit 16 then determines that the first water level sensor 22 emits a high water level signal. It is determined whether or not it is emitted (step S205). Here, when the control unit 16 determines that the first water level sensor 22 does not emit a high water level signal (NO), the process proceeds to step S202. On the other hand, when the control unit 16 determines that the first water level sensor 22 is emitting a high water level signal (YES), the control unit 16 ends the primary water storage process without operating the pump 21.

FIG. 5 is a flowchart showing the flow of the purification step S102. In the purification step S102, the water purification device 12 circulates water containing raw water with the primary water tank 10 for a certain period of time. The time for circulating water between the primary water tank 10 and the water purification device 12 is hereinafter referred to as "circulation time".

First, the control unit 16 starts the operation of the water purification device 12 (step S301). Specifically, first, the control unit 16 switches the first switching unit 32 so that water circulates in the circulation pipe 30. Next, the control unit 16 starts the operation of all the water supply pumps 40, and also starts the operation of the ozone injection unit 44. As a result, purification of the raw water in the primary water tank 10 proceeds.

Next, the control unit 16 determines whether or not the set circulation time has elapsed (step S302). Here, when the control unit 16 determines that the circulation time has elapsed (YES), the control unit 16 stops the operation of the ozone injection unit 44 (step S303), and ends the purification step S102. Since the water supply pump 40 is used as a power source for transferring purified water to the secondary water storage tank 14 in the subsequent secondary water storage step S103, it may be continuously operated at this time.

FIG. 6 is a flowchart showing the flow of the secondary water storage step S103. When the secondary water storage step S103 is started, first, the control unit 16 issues a low water level signal predetermined by the second water level sensor 53, that is, whether the purified water in the secondary water storage tank 14 is below the low water level. It is determined whether or not there is (step S401).

When the control unit 16 determines in step S401 that the second water level sensor 53 is emitting a low water level signal (YES), then the purified water in the primary water tank 10 is directed to the secondary water tank 14. The first switching unit 32 is switched and stored in the secondary water storage tank 14 (step S402). Next, the control unit 16 determines whether the purified water in the primary water tank 10 is below the low water level, that is, whether the first water level sensor 22 is emitting a low water level signal (step S403). Then, when the control unit 16 determines in step S403 that the first water level sensor 22 is emitting a low water level signal (YES), the control unit 16 stops the operation of all the water supply pumps 40 (step S404), and secondary The water storage step S103 is completed.

On the other hand, when the control unit 16 determines in step S401 that the second water level sensor 53 does not emit a low water level signal (NO), the control unit 16 then determines that the second water level sensor 53 emits a high water level signal. It is determined whether or not it is emitted (step S405). Here, when the control unit 16 determines that the second water level sensor 53 does not emit a high water level signal (NO), the process proceeds to step S402. On the other hand, when the control unit 16 determines that the second water level sensor 53 is emitting a high water level signal (YES), the secondary water tank 14 does not have a new volume for storing purified water, so step S404 And the secondary water storage step S103 is completed.

Then, in the water distribution step S104, the control unit 16 operates the water distribution pump 52 to suck up purified water from the secondary water storage tank 14 and distribute it to each house 200 via the water distribution pipe 51.

FIG. 7 is a flowchart showing the flow of the cleaning step S105. When the cleaning step S105 is started, first, the control unit 16 switches the first switching unit 32 and the second switching unit 33 so that the filtration tank 43 can be backwashed (step S501). Specifically, the control unit 16 switches the first switching unit 32 and the second switching unit 33 so that water containing raw water flows through the cleaning pipe 54, the filtration tank 43, and the drainage pipe 55 in this order. Next, the control unit 16 starts the operation of all the water supply pumps 40 (step S502). As a result, cleaning of the filtration tank 43 proceeds. Next, the control unit 16 determines whether or not the set cleaning time has elapsed (step S503). Here, when the control unit 16 determines that the cleaning time has elapsed (YES), the operation of the water supply pump 40 is stopped (step S504), and the cleaning step S105 is terminated.

Next, the specific operation of the water treatment system 1 will be described in more detail with reference to FIGS. 8 to 10. In the water treatment system 1, the first switching unit 32 and the second switching unit 33 switch to either the flow path in the purification step S102, the flow path in the secondary water storage step S103, or the flow path in the cleaning step S105.

In the purification step S102, as shown in FIG. 8, the first switching unit 32 switches the flow path so that the filtered water generated in the filtration tank 43 faces the primary water storage tank 10. Specifically, the first two-way valve 32a of the first switching unit 32 is opened, the second two-way valve 32b is closed, and the third two-way valve 32c is closed. On the other hand, the second switching unit 33 switches the flow path so that the water sent by the plurality of water pumps 40 goes to the filtration tank 43 without going through the cleaning pipe 54. Specifically, the fourth two-way valve 33a of the second switching unit 33 is opened, and the fifth two-way valve 33b is closed.

When the third two-way valve 32c is closed, the raw water in the primary water tank 10 is sent to the circulation pipe 30 by the water supply pump 40 without going through the cleaning pipe 54. The water sent to the circulation pipe 30 flows through the circulation pipe 30 without being drained by closing the fifth two-way valve 33b. Then, the water sent to the circulation pipe 30 passes through the filtration tank 43 when the fourth two-way valve 33a is opened. The filtered water generated in the filter tank 43 cannot flow to the secondary water storage tank 14 due to the closing of the second two-way valve 32b. Then, the filtered water generated in the filtration tank 43 can flow to the primary water storage tank 10 by opening the first two-way valve 32a.

Therefore, in the purification step S102, as shown by the solid line in the figure, the water sent by the water supply pump 40 returns to the primary water tank 10 through the primary water tank 10, the parallel pipe 31, and the circulation pipe 30. That is, the water containing the raw water repeatedly circulates in the water purification device 12. In the water treatment system 1, the purification step S102 repeatedly passes the raw water through the filtration tank 43 to generate more purified water.

In the secondary water storage step S103, as shown in FIG. 9, the first switching unit 32 switches the flow path so that the filtered water generated in the filtration tank 43 goes toward the secondary water storage tank 14. Specifically, the first two-way valve 32a of the first switching unit 32 is closed, the second two-way valve 32b is opened, and the third two-way valve 32c is closed. On the other hand, the second switching unit 33 switches the flow path so that the water sent by the plurality of water pumps 40 goes to the filtration tank 43 without going through the cleaning pipe 54. Specifically, the fourth two-way valve 33a of the second switching unit 33 is opened, and the fifth two-way valve 33b is closed.

When the third two-way valve 32c is closed, the raw water in the primary water tank 10 is sent to the circulation pipe 30 by the water supply pump 40 without going through the cleaning pipe 54. The water sent to the circulation pipe 30 flows through the circulation pipe 30 without being drained by closing the fifth two-way valve 33b. Then, the water sent to the circulation pipe 30 passes through the filtration tank 43 when the fourth two-way valve 33a is opened. The filtered water generated in the filtration tank 43 cannot flow to the primary water storage tank 10 when the first two-way valve 32a is closed. Then, the filtered water generated in the filtration tank 43 can flow to the secondary water storage tank 14 by opening the second two-way valve 32b.

Therefore, in the secondary water storage step S103, as shown by the solid line in the figure, the water sent by the water supply pump 40 passes through the primary water tank 10, the parallel pipe 31, the circulation pipe 30, and the lead-out pipe 50 to the secondary water storage tank. Sent to 14. That is, the purified water purified by the water purification device is sent to the secondary water storage tank 14.

In the cleaning step S105, as shown in FIG. 10, the first switching unit 32 switches the flow path so that the water passing through the cleaning pipe 54 goes to the filtration tank 43. Specifically, the first two-way valve 32a of the first switching unit 32 is closed, the second two-way valve 32b is closed, and the third two-way valve 32c is opened. On the other hand, the second switching unit 33 switches the flow path so that the water sent by the plurality of water pumps 40 goes to the filtration tank 43 via the cleaning pipe 54. Specifically, the fourth two-way valve 33a of the second switching unit 33 is closed, and the fifth two-way valve 33b is opened.

The raw water in the primary water tank 10 is sent to the circulation pipe 30 via the cleaning pipe 54 by the water supply pump 40 when the fourth two-way valve 33a is closed and the third two-way valve 32c is opened. The water sent to the circulation pipe 30 cannot flow to the primary water tank 10 due to the closing of the first two-way valve 32a. Further, the water sent to the circulation pipe 30 cannot flow to the secondary water storage tank 14 due to the closing of the second two-way valve 32b. On the other hand, the water sent to the circulation pipe 30 is drained through the drain pipe 55 by closing the 4th two-way valve 33a and opening the 5th two-way valve 33b.

Therefore, in the cleaning step S105, as shown by the solid line in the figure, the water sent by the water supply pump 40 is drained through the primary water tank 10, the parallel pipe 31, the cleaning pipe 54, the circulation pipe 30, and the drainage pipe 55. To. That is, the water in the primary water tank 10 flows and is drained in the direction opposite to the direction in which the filter tank 43 produces the filtered water. In the water treatment system 1, the cleaning step S105 removes foreign substances existing between the filter media of the filter tank 43, and the filter tank 43 is cleaned.

As described above, according to the water treatment system 1 according to the present embodiment, the water treatment including the purification step S102, the secondary water storage step S103, and the cleaning step S105 can be carried out.

[Second Embodiment]
Next, the water treatment system 1 according to the second embodiment will be described with reference to FIGS. 11 to 13. Since the water treatment system 1 according to the second embodiment is the same as the water treatment system 1 according to the first embodiment except for the configuration of the first switching unit 32 and the second switching unit 33, the description thereof will be omitted.

In the water treatment system 1 according to the present embodiment, the first three-way valve 32d is used instead of the first two-way valve 32a and the second two-way valve 32b of the water treatment system 1 according to the first embodiment. Further, in the water treatment system 1 according to the present embodiment, the second three-way valve 33c is used instead of the fourth two-way valve 33a and the fifth two-way valve 33b of the water treatment system 1 according to the first embodiment. .. That is, the first switching unit 32 includes the first three-way valve 32d. Further, the second switching unit 33 includes a second three-way valve 33c.

The first three-way valve 32d connects the circulation pipe 30 and the outlet pipe 50. Specifically, the first three-way valve 32d is a three-way solenoid valve that connects the discharge port of the circulation pipe 30, the introduction port of the circulation pipe 30, and the introduction port of the outlet pipe 50, respectively.

The second three-way valve 33c connects the plurality of parallel pipes 31 in the circulation pipe 30 and the filtration tank 43 and the drainage pipe 55. Specifically, the second three-way valve 33c is a three-way solenoid valve that connects the discharge port of the circulation pipe 30, the introduction port of the circulation pipe 30, and the introduction port of the drainage pipe 55, respectively.

Next, the specific operation of the water treatment system 1 according to the present embodiment will be described with reference to FIGS. 11 to 13. As described below, also in the water treatment system 1 according to the present embodiment, the water treatment including the purification step S102, the secondary water storage step S103, and the cleaning step S105 is performed by the same operation as the water treatment system 1 according to the first embodiment. Can be carried out.

In the purification step S102, as shown in FIG. 11, the first switching unit 32 switches the flow path so that the filtered water generated in the filtration tank 43 faces the primary water storage tank 10. On the other hand, the second switching unit 33 switches the flow path so that the water sent by the plurality of water pumps 40 goes to the filtration tank 43 without going through the cleaning pipe 54.

Therefore, as shown by the solid line in the figure, in the purification step S102, the water sent by the water supply pump 40 returns to the primary water tank 10 through the primary water tank 10, the parallel pipe 31, and the circulation pipe 30. That is, the water containing the raw water repeatedly circulates in the water purification device 12. In the water treatment system 1, the purification step S102 repeatedly passes the raw water through the filtration tank 43 to generate more purified water.

In the secondary water storage step S103, as shown in FIG. 12, the first switching unit 32 switches the flow path so that the filtered water generated in the filtration tank 43 goes toward the secondary water storage tank 14. On the other hand, the second switching unit 33 switches the flow path so that the water sent by the plurality of water pumps 40 goes to the filtration tank 43 without going through the cleaning pipe 54.

Therefore, in the secondary water storage step S103, as shown by the solid line in the figure, the water sent by the water supply pump 40 passes through the primary water tank 10, the parallel pipe 31, the circulation pipe 30, and the lead-out pipe 50 to the secondary water storage tank. Sent to 14. That is, the purified water purified by the water purification device is sent to the secondary water storage tank 14.

In the cleaning step S105, as shown in FIG. 13, the first switching unit 32 switches the flow path so that the water passing through the cleaning pipe 54 goes to the filtration tank 43. On the other hand, the second switching unit 33 switches the flow path so that the water sent by the plurality of water pumps 40 goes to the filtration tank 43 via the cleaning pipe 54.

Therefore, in the cleaning step S105, as shown by the solid line in the figure, the water sent by the water supply pump 40 is drained through the primary water tank 10, the parallel pipe 31, the cleaning pipe 54, the circulation pipe 30, and the drainage pipe 55. To. That is, the water in the primary water storage tank 10 flows in the direction opposite to the direction in which the filter tank 43 produces the filtered water, and is drained. In the water treatment system 1, the cleaning step S105 removes foreign substances existing between the filter media of the filter tank 43, and the filter tank 43 is cleaned.

Next, the effects of the water treatment system 1 and the water treatment method will be described.

First, the water treatment system 1 according to the present embodiment is purified by a water purification device 12 that circulates and purifies the raw water between the primary water storage tank 10 that stores the raw water and the primary water storage tank 10, and a water purification device 12. A secondary water storage tank 14 for storing purified water, a cleaning pipe 54, and a switching unit 32 are provided. The water purification device 12 includes a circulation pipe 30 for circulating water including raw water, and a plurality of parallel pipes 31 connected to the circulation pipe 30. The water purification device 12 is installed in each of the parallel pipes 31, and is installed in a plurality of water pumps 40 for pumping and sending raw water from the primary water tank 10 and in a circulation pipe 30 so as to be parallel to the cleaning pipe 54 to supply the raw water. A filtration tank 43 for filtering is provided. In the switching unit 32, the filtered water generated in the filter tank 43 heads for the primary water storage tank 10, the filtered water generated in the filter tank 43 heads for the secondary water storage tank 14, or passes through the cleaning pipe 54. The flow path is switched so that the generated water goes to the filtration tank 43.

Alternatively, the water treatment method according to the present embodiment includes a primary water storage step S101 in which raw water is stored in the primary water storage tank 10, and a water purification device 12 including a primary water storage tank 10 and a filter tank 43 for collecting raw water stored in the primary water storage step S101. Includes a purification step S102 that circulates and purifies the water. The water treatment method includes a secondary water storage step S103 in which the purified water purified in the purification step S102 is stored in the secondary water storage tank 14, and a cleaning step S105 in which water containing raw water is passed through the cleaning pipe 54 to clean the filter tank 43. And include. In the purification step S102, a plurality of water supply pumps 40 installed in each of the plurality of parallel pipes 31 connected to the circulation pipe 30 for circulating water including raw water draw out the raw water from the primary water tank 10 and send it. Subsequently, in the purification step S102, the raw water is filtered by passing through the filtration tank 43 installed in the circulation pipe 30 so as to be parallel to the cleaning pipe 54. In the purification step S102, the flow path is switched so that the filtered water generated in the filtration tank 43 goes to the primary water storage tank 10. In the secondary water storage step S103, the flow path is switched so that the filtered water generated in the filter tank 43 goes to the secondary water storage tank 14. In the cleaning step S105, the flow path is switched so that the water that has passed through the cleaning pipe 54 goes to the filtration tank 43.

Generally, in a water treatment system in which raw water is purified by passing it through a filtration tank only once, the filtration tank is selected so as to satisfy filtration conditions such as linear velocity (LV) and space velocity (SV). .. Here, the linear velocity means the velocity of raw water passing through the cross-sectional area of the filtration tank per unit time. Spatial velocity is the reciprocal of the time that raw water comes into contact with the filtration tank per unit time. On the other hand, in the water treatment system 1 and the water treatment method according to the present embodiment, the raw water is circulated between the primary water storage tank 10 and the water purification device 12, that is, the raw water is passed through the filtration tank 43 a plurality of times. Purify by letting. Therefore, the filtration tank 43 can be selected without significantly depending on the linear velocity and the space velocity without deteriorating the purification performance, and as a result, the filtration tank of the water treatment system in which the raw water is passed only once can be selected. It can be miniaturized.

In general, assuming that the water purified by one water treatment system is distributed to a plurality of houses, if only one water pump is used, for example, the load on the water pump is considered to be high. It is necessary to select a high-performance one with durability. On the other hand, in the water treatment system 1 and the water treatment method according to the present embodiment, water containing raw water is circulated by using a plurality of water pumps 40. Therefore, as the individual water supply pump 40, higher performance than the water supply pump when only one is used in the water treatment system is not required, so that a relatively inexpensive pump can be applied. Further, even if an abnormality occurs in some of the plurality of water supply pumps 40, the remaining water supply pumps 40 operate, so that the purification process can be continued without stopping the entire water treatment system 1. ..

According to such a water treatment system 1, all the water sent by any one of the plurality of water supply pumps 40 goes to the filtration tank 43, so that the circulating water surely passes through the filtration tank 43. Can be made to. Further, since the filtration tank 43 is installed in the circulation pipe 30, it is sufficient that at least one filtration tank 43 is installed, and as a result, an increase in the number of installations of the filtration tank 43 can be suppressed. Further, in the water treatment system 1, since the cleaning pipe 54 is installed, the backflow cleaning of the filtration tank 43 becomes possible, and the deterioration of the filtration performance due to the operating time of the water treatment system 1 can be suppressed. Further, since the filtration tank 43 is installed in the circulation pipe 30, the pipe configuration for backflow cleaning is simplified as compared with the case where the water supply pump 40 is provided in each of the parallel pipes 31.

In the water treatment system 1, in addition to installing the filtration tank 43 in a part of the circulation pipe 30 in which the plurality of parallel pipes 31 merge on the downstream side, an auxiliary is provided to any one of the plurality of parallel pipes 31. A filtration tank may be added to carry out specific filtration. In this case, the auxiliary filtration tank is installed at least on the downstream side of the water supply pump in the parallel pipe 31.

Further, according to such a water treatment system 1, the flow of water when circulating in the circulation pipe 30 and the flow of water when leading the purified water to the secondary water storage tank 14 and the filtration tank 43 are washed. The flow of water at that time can be changed only by switching the first switching unit 32. Further, in this case, the plurality of water supply pumps 40 are power sources for circulating water in the circulation pipe 30, and are also power sources for deriving purified water from the water purification device 12 to the secondary water storage tank 14. It is also a power source for cleaning the filter tank 43. That is, according to such a water treatment system 1, it is not necessary to separately install a pump specialized for deriving purified water from the water purification device 12 to the secondary water storage tank 14 and cleaning the filtration tank 43, so that the water treatment is performed. The configuration of the system 1 can be further simplified.

As described above, according to the present embodiment, it is possible to provide a water treatment system and a water treatment method that are advantageous in terms of cost while maintaining purification performance.

Further, in the water treatment system 1, the number of installations of the filtration tank 43 may be smaller than the number of installations of the water supply pump 40.

According to such a water treatment system 1, the number of installed filtration tanks 43 is smaller than the number of installed water supply pumps 40. Therefore, as the number of filtration tanks 43 increases, the introduction cost and maintenance cost for maintenance and the like increase. It can be suppressed.

Further, in the water treatment system 1, the water purification device 12 may include an ozone injection unit 44 that injects ozone into the water that has passed through the filtration tank 43.

Generally, in a water treatment system that purifies raw water by passing it through a filtration tank only once, a chlorine agent as an oxidant may be injected into the raw water as a treatment for the raw water before it passes through the filtration tank. There are many. However, when using chlorinated chemicals, there are many points to be taken, such as over-injection, labor for replenishment, and measures against chloric acid related to storage stability during storage. On the other hand, according to such a water treatment system 1, since ozone is used as an oxidant, it is not necessary to take measures against overinjection and replenishment, and the running cost is lower than when a chlorine chemical is used. can do.

Here, as the ozone injection unit 44, it is desirable to use a Venturi pipe installed in the circulation pipe 30. By adopting the Venturi tube method as the ozone injection method, the device configuration is simplified by eliminating the need for a device such as an air pump, and the reaction efficiency between raw water and ozone is improved.

Further, in the water treatment system 1, the water purification device 12 may include a check valve 41 installed on the downstream side of the water supply pump 40 in each of the plurality of parallel pipes 31.

According to such a water treatment system 1, even if an abnormality occurs in any of the water pumps 40 installed in the parallel pipes 31 and the operation is stopped, the check valve 41 operates. , The backflow of water from the downstream side to the upstream side of the water supply pump 40 can be suppressed.

Further, the water treatment system 1 may include a lead-out pipe 50 for leading the purified water purified by the water purification device 12 to the secondary water storage tank 14. In this case, one end (first end) of the cleaning pipe 54 is connected between the plurality of water pumps 40 and the filtration tank 43, and the other end (second end) is the circulation pipe 30 and the outlet pipe 50. It may be connected to the circulation pipe 30 between the connecting portion and the filtration tank 43.

According to such a water treatment system 1, the length of the cleaning pipe 54 can be shortened, so that the cost required for the pipe can be reduced. Further, when cleaning the filtration tank 43 in the cleaning step S105, the distance from the water supply pump 40 to the filtration tank 43 can be shortened, so that the load on the water supply pump 40 in the cleaning step S105 can be reduced.

The second end of the cleaning pipe 54 may be connected to the connection portion between the circulation pipe 30 and the outlet pipe 50, or may be connected between the connection portion and the filtration tank 43, and the filtration tank may be connected. It may be connected to 43.

Further, the water treatment system 1 may include a lead-out pipe 50 for leading the purified water purified by the water purification device to the secondary water storage tank 14. In this case, in the water treatment system 1, the first switching unit 32 (switching unit) is installed in the circulation pipe 30 between the connection portion between the circulation pipe 30 and the outlet pipe 50 and the primary water tank 10. The square valve 32a and the second two-way valve 32b installed in the lead-out pipe 50 may be included. Further, the first switching unit 32 may include a third two-way valve 32c installed in the cleaning pipe 54.

According to such a water treatment system 1, it is possible to switch the flow path required for the purification step S102, the secondary water storage step S103, and the cleaning step S105 by using highly versatile parts. Therefore, it is possible to provide the water treatment system 1 which is advantageous in terms of cost.

The first switching unit 32 may include a first three-way valve 32d instead of the first two-way valve 32a and the second two-way valve 32b. Further, the first switching unit 32 may include a four-way valve (not shown) in place of the first two-way valve 32a, the second two-way valve 32b, and the third two-way valve 32c. The four-way valve may be installed in the circulation pipe 30 and connected to one end of the cleaning pipe 54 and one end of the outlet pipe 50. According to such a first three-way valve 32d or a four-way valve, the water treatment system 1 can be configured with a smaller number of parts as compared with the case where the two-way valve is used.

Further, in the water treatment system 1, the switching unit 32 may be the first switching unit 32. The water treatment system 1 may include a second switching unit 33 in which at least a part of the circulation pipe 30 is installed between the plurality of parallel pipes 31 and the filtration tank 43. In the second switching unit 33, the water sent by the plurality of water pumps 40 goes to the filtration tank 43 without going through the washing pipe 54, or the water sent by the plurality of water pumps 40 goes through the washing pipe 54. The flow path may be switched so as to go to the filtration tank 43.

According to such a water treatment system 1, by interlocking with the first switching unit 32, the flow paths required for the purification step S102, the secondary water storage step S103, and the cleaning step S105 can be switched with a simple configuration.

In the above description, the second switching unit 33 installed in the circulation pipe 30 cleans the filtration tank 43 and drains the washing water flowing through the circulation pipe 30. However, the washing water may not flow from the filtration tank 43 to the circulation pipe 30, and may be drained directly from the filtration tank 43.

Further, in the water treatment system 1, the second switching unit 33 may include a three-way valve.

According to such a three-way valve, the water treatment system 1 can be configured with a smaller number of parts as compared with the case where the two-way valve is used, so that the configuration of the water treatment system 1 can be simplified. ..

Further, in the water treatment system 1, one end of the drainage pipe 55 is connected to the circulation pipe 30 between the plurality of parallel pipes 31 and the filtration tank 43, and drains the water that has passed through the filtration tank 43 via the cleaning pipe 54. You may prepare.

According to such a water treatment system 1, the water washed in the filtration tank 43 can be drained from the circulation pipe 30 through the drainage pipe 55, so that the circulation pipe 30 used in the purification step S102 and the secondary water storage step S103 is used. Can also be used. In addition, the washing water can be drained from the water purification device 12 by using highly versatile parts.

In the above description, it is assumed that the purified water purified by the water treatment system 1 is used as domestic water in each house 200 or the like. On the other hand, the water treatment system 1 may be modified so that the purified water purified by the water treatment system 1 is suitable for being used as drinking water in each house 200 or the like. For example, in the water treatment system 1, a filter may be provided between the secondary water storage tank 14 and the water distribution pump 52 to further filter the purified water transferred from the secondary water storage tank 14 for drinking.

Further, in the above description, the primary water tank 10 and the secondary water tank 14 are represented as one in the drawing, but they may actually be composed of a plurality of tanks.

In the above description, the cleaning step S105 was carried out after the water distribution step S104, but the cleaning step S105 was carried out before any one of the primary water storage step S101, the purification step S102, the secondary water storage step S103 and the water distribution step S104. You may.

Although the preferred embodiment has been described above, the present embodiment is not limited to this, and various modifications and changes can be made within the scope of the gist thereof.

1 Water treatment system 10 Primary water tank 12 Water purification device 14 Secondary water tank 30 Circulation pipe 31 Parallel pipe 32 1st switching part (switching part)
32a 1st two-way valve 32b 2nd two-way valve 32c 3rd two-way valve 33 2nd switching part 40 Water supply pump 41 Check valve 43 Filtration tank 44 Ozone injection part 50 Derivation pipe 54 Cleaning pipe 55 Drainage pipe

Claims (10)

A primary water tank that stores raw water,
A water purification device that circulates and purifies the raw water between the primary water tank and the water purification tank.
A secondary water tank that stores purified water purified by the water purification device,
Cleaning piping and
Switching part and
With
The water purification device
A circulation pipe that circulates water containing raw water,
A plurality of parallel pipes connected to the circulation pipe and
A plurality of water pumps installed in each of the parallel pipes to pump and send the raw water from the primary water tank.
It is provided with a filtration tank which is installed in the circulation pipe so as to be parallel to the washing pipe and filters the raw water.
In the switching unit, the filtered water generated in the filter tank heads for the primary water storage tank, the filtered water generated in the filter tank heads for the secondary water storage tank, or the inside of the cleaning pipe is used. A water treatment system that switches the flow path so that the passed water goes to the filtration tank. The water treatment system according to claim 1, wherein the number of installed filtration tanks is smaller than the number of installed water pumps. The water treatment system according to claim 1 or 2, wherein the water purification device includes an ozone injection unit that injects ozone into the water that has passed through the filtration tank. The water treatment system according to any one of claims 1 to 3, wherein the water purification device includes a check valve installed on the downstream side of the water supply pump in each of the plurality of parallel pipes. It is provided with a lead-out pipe for leading the purified water purified by the water purification device to the secondary water storage tank.
One end of the cleaning pipe is connected between the plurality of water pumps and the filtration tank, and the other end is connected to the circulation pipe between the connection portion between the circulation pipe and the outlet pipe and the filtration tank. The water treatment system according to any one of claims 1 to 4. It is provided with a lead-out pipe for leading the purified water purified by the water purification device to the secondary water storage tank.
The switching portion is installed in the first two-way valve installed in the circulation pipe between the primary water storage tank and the filtration tank, the second two-way valve installed in the outlet pipe, and the cleaning pipe. The water treatment system according to any one of claims 1 to 5, which includes a third two-way valve. The switching unit is the first switching unit.
At least a part of the circulation pipe is installed between the plurality of parallel pipes and the filter tank, and the water sent by the plurality of water supply pumps goes to the filter tank without going through the cleaning pipe, or The water treatment according to any one of claims 1 to 6, further comprising a second switching unit that switches the flow path so that the water sent by the plurality of water supply pumps goes to the filtration tank via the cleaning pipe. system. The water treatment system according to claim 7, wherein the second switching unit includes a three-way valve. One of claims 1 to 8, wherein one end is connected to a circulation pipe between the plurality of parallel pipes and the filter tank, and the drain pipe is provided for draining water that has passed through the filter tank through the cleaning pipe. The water treatment system according to item 1. The primary water storage process, in which raw water is stored in the primary water tank,
A purification step of purifying the raw water stored in the primary water storage step by circulating it between the primary water storage tank and a water purification device including a filtration tank.
The secondary water storage process, in which the purified water purified in the purification process is stored in the secondary water storage tank,
A cleaning process in which water containing the raw water is passed through the cleaning pipe to clean the filtration tank, and
Including
In the purification step, a plurality of water pumps installed in each of a plurality of parallel pipes connected to a circulation pipe for circulating water containing the raw water pump out the raw water from the primary water tank and send the raw water to the cleaning. The raw water is filtered by passing through the filtration tank installed in the circulation pipe so as to be parallel to the pipe.
In the purification step, the flow path is switched so that the filtered water generated in the filtration tank goes to the primary water storage tank.
In the secondary water storage step, the flow path is switched so that the filtered water generated in the filter tank goes to the secondary water storage tank.
In the cleaning step, a water treatment method in which the flow path is switched so that the water that has passed through the cleaning pipe goes to the filtration tank.

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