Water treatment and water supply system

Abstract

To provide a water treatment and supply system capable of securing water for backwashing. [Solution] The water treatment and water supply system 1 comprises a raw water pump 10, a filtration tank 13 for treating the raw water sent from the raw water pump 10, a treated water tank 16 for storing the treated water treated in the filtration tank 13, a water supply pump 18 for sending the treated water from the treated water tank 16 to the water supply destination, a backwash pump 17 for washing by backflowing the treated water from the treated water tank 16 into the filtration tank 13, a supply system valve 20 for opening and closing a flow path for supplying water to the treated water tank 16 from the supply system, and a control device 22 that opens the supply system valve 20 and supplies water to the treated water tank 16 from the supply system during the backwashing process that drives the backwash pump 17.

Description

Technical Field

[0001] The present invention relates to a water treatment and water supply system that performs water treatment and water supply.

Background Art

[0002] Conventionally, there has been known a water treatment and water supply system including a water treatment device that removes solid particles such as sand contained in raw water and components to be removed such as iron and manganese contained in water, and a water supply device that supplies treated water that has undergone water treatment to a secondary side. As the treatment proceeds in a filtration tank of a water treatment device, the treatment capacity decreases and clogging occurs, so a technique of performing a backwash operation using treated water or tap water is known (see, for example, Patent Document 1).

Prior Art Literature

Patent Literature

[0003]

Patent Document 1

Summary of the Invention

Problem to be Solved by the Invention

[0004] In the aforementioned water treatment and water supply system, depending on the capacity of a water receiving tank that stores treated water and the amount of treated water stored in the water receiving tank, there is a possibility that sufficient water for backwashing cannot be secured.

[0005] Therefore, an object of the present invention is to provide a water treatment and water supply system capable of securing water for backwashing.

Means for Solving the Problem

[0006] According to one aspect of the present invention, a water treatment water supply system comprises a raw water pump, a filtration tank for treating the raw water supplied from the raw water pump, a treated water tank for storing the treated water treated in the filtration tank, a water supply pump for supplying the treated water from the treated water tank to a water supply destination, a backwash pump for washing the treated water from the treated water tank by backflowing it into the filtration tank, a supply system valve for opening and closing a flow path for supplying water to the treated water tank from a supply system, and a control device that opens the supply system valve and supplies water to the treated water tank from the supply system during the backwash process that drives the backwash pump. [Effects of the Invention]

[0007] This invention can provide a water treatment and water supply system that can secure water for backwashing. [Brief explanation of the drawing]

[0008] [Figure 1] A schematic diagram illustrating the configuration of a water treatment and water supply system according to one embodiment of the present invention. [Figure 2] A schematic diagram illustrating the configuration of the water treatment and water supply system. [Figure 3] A schematic diagram illustrating the configuration of the water treatment and water supply system. [Figure 4] A flowchart illustrating an example of the operation flow of the raw water pump in the same water treatment and supply system. [Figure 5] A flowchart illustrating an example of the operation flow of a replenishment system valve in the same water treatment and water supply system. [Figure 6] A flowchart illustrating an example of the operation flow of the backwash pump in the same water treatment and water supply system. [Modes for carrying out the invention]

[0009] The configuration of the water treatment and water supply system 1 according to one embodiment of the present invention will be described below with reference to Figures 1 to 6. Figures 1 to 3 are explanatory diagrams that schematically show the configuration of the water treatment and water supply system 1. Figure 1 is an explanatory diagram that shows an example of the water flow during normal filtration. Figure 2 is an explanatory diagram that shows an example of the water flow during backwashing. Figure 3 is an explanatory diagram that shows an example of the water flow when the backwash pump is stopped when the water level drops during backwashing. Figure 4 is a flowchart showing an example of the operation flow of the raw water pump 10 of the water treatment and water supply system 1, Figure 5 is a flowchart showing an example of the operation flow of the replenishment system valve 20 of the water treatment and water supply system 1, and Figure 6 is a flowchart showing an example of the operation flow of the backwash pump 17 of the water treatment and water supply system 1.

[0010] As shown in Figure 1, the water treatment and supply system 1 pumps raw water from a supply source such as a well, treats the raw water in a filtration tank 13, stores the treated water in a treated water tank 16, and then supplies it to the destination. Here, the treatment of raw water in the filtration tank 13 is performed by passing it through a filter material 23 installed inside the filtration tank 13. Various treatments of raw water in the filtration tank 13 include treatments to remove iron and manganese from the raw water by supplying sodium hypochlorite or the like to the raw water and filtering out iron and manganese, and treatments to filter out impurities such as solid particles such as sand from the raw water.

[0011] The water treatment and water supply system 1 is a device that includes a water treatment device and a water supply device. Specifically, the water treatment and water supply system 1 includes a raw water pump 10, an on-off valve 11, a first switching valve 12, a filtration tank 13, a second switching valve 14, a third switching valve 15, a treated water tank 16, a backwash pump 17, a water supply pump 18, a water level detector 19, a replenishment system valve 20, piping 21, and a control system 22. The water treatment and water supply system 1 may also include a sand filter, a chemical injection device, etc.

[0012] The raw water pump 10 pumps raw water from a supply source such as a well and sends the raw water to the secondary side. The on-off valve 11 is installed between the raw water pump 10 and the first switching valve 12. The on-off valve 11 opens and closes the flow path based on a command signal from the control system 22.

[0013] The first switching valve 12 selectively connects to the raw water pump 10, the filtration tank 13, and the backwash drain (drain) for discharging backwash water during backwashing. The first switching valve 12 is, for example, a three-way valve. The first switching valve 12 is configured to be switchable between connecting the raw water pump 10 and the filtration tank 13, and connecting the filtration tank 13 and the backwash drain, based on a command signal from the control system 22.

[0014] The filtration tank 13 houses a filter and filter material within a cylindrical tank body. The filtration tank 13 is designed to process the raw water that passes through it. For example, the filter in the filtration tank 13 restricts the movement of solid particles and filter material to the secondary side. The filter material in the filtration tank 13 collects and removes components to be removed from the raw water by coming into contact with the raw water, for example. For example, the filter material collects iron and / or manganese components, as well as solid particles such as sand, from the raw water.

[0015] The second switching valve 14 selectively connects the filtration tank 13, the third switching valve 15, and the backwash pump 17. The second switching valve 14 is, for example, a three-way valve. The second switching valve 14 is configured to be switchable by a command signal from the control system 22 between connecting the filtration tank 13 and the third switching valve 15, and connecting the filtration tank 13 and the backwash pump 17.

[0016] The third switching valve 15 is connected to the second switching valve 14, the treatment water tank 16, and the drain for discharging the washing water during the washing process. The third switching valve 15 is, for example, a three-way valve. The third switching valve 15 is configured to be switchable between connecting the second switching valve 14 and the treatment water tank 16, and connecting the second switching valve 14 and the drain for discharging the washing water, based on a command signal from the control system 22.

[0017] The treatment tank 16 is formed to store the treated water treated in the filtration tank 13. The treatment tank 16 is connected to the treated water supply destination, for example, via a pump device. The treatment tank 16 is equipped with a water level detector 19 on its top plate, for example. The treatment tank 16 is formed in such a shape that, for example, the volume of water when full is less than the total volume of water used for backwashing.

[0018] The backwash pump 17 feeds the treated water in the treated water tank 16 on the primary side to the second switching valve 14 on the secondary side, and supplies the treated water to the filter tank 13. The driving of the backwash pump 17 is controlled by a command signal from the control system 22.

[0019] The water supply pump 18 feeds the treated water in the treated water tank 16 on the primary side to a water supply destination on the secondary side. Here, the water supply destination is, for example, a faucet such as a tap or a shower head provided in a building. The driving of the water supply pump 18 is controlled by a command signal from the control system 22.

[0020] The water level detector 19 is an electrode-type level switch that detects the water level of the treated water tank 16. The water level detector 19 has a plurality of electrode rods 19a and is formed to be capable of detecting a plurality of water levels. The water level detector 19 outputs the detected water level as a signal to the control system 22.

[0021] As a specific example, the water level detector 19 has eight electrode rods 19a, and is formed to be capable of detecting seven different water levels in the treated water tank 16. Here, examples of the seven water levels detected by the water level detector 19, from low water level to high water level, are: water shortage, backwash pump OFF, backwash pump operable, supply system open, supply system closed, raw water pump ON, raw water pump OFF (full water).

[0022] The supply system valve 20 is, for example, an on-off valve. The supply system valve 20 opens and closes a flow path connecting the supply system formed by the piping 21 and the treated water tank 16 according to a command signal from the control system 22. The primary side of the supply system valve 20 is connected to a supply system such as a water branch pipe, and the secondary side is connected to the treated water tank 16. That is, when the supply system valve 20 is in an open state, it supplies water from the supply system to the treated water tank 16, and when it is in a closed state, it stops the supply of water from the supply system to the treated water tank 16. It should be noted that the water supplied from the primary side of the supply system valve 20 only needs to be usable for backwash treatment and water supply treatment, and is not limited to tap water, and may be treated water treated by another system.

[0023] The piping 21 fluidly connects each component and forms a flow path for water. Specifically, the piping 21 has first piping 21a to twelfth piping 21l.

[0024] The first pipe 21a connects the raw water pump 10 and the first switching valve 12. The first pipe 21a is also equipped with an on / off valve 11. The second pipe 21b connects the first switching valve 12 and the filtration tank 13. The third pipe 21c connects the first switching valve 12 and the drain outlet during backwashing. The fourth pipe 21d connects the filtration tank 13 and the second switching valve 14. The fifth pipe 21e connects the second switching valve 14 and the third switching valve 15. The sixth pipe 21f connects the third switching valve 15 and the treated water tank 16. The seventh pipe 21g connects the third switching valve 15 and the drain outlet during washing. The 8th pipe 21h connects the treated water tank 16 and the backwash pump 17. The 9th pipe 21i connects the backwash pump 17 and the second switching valve 14. The 10th pipe 21j connects the treated water tank 16 and the water supply pump 18. The 11th pipe 21k connects the water supply pump 18 and the water supply destination. The 12th pipe 21l connects to the treated water tank 16 and the replenishment system. A replenishment system valve 20 is also provided on the 12th pipe 21l.

[0025] The control system 22 is a control system that controls each component of the water treatment and water supply system 1, and is composed of, for example, multiple control panels. The control system 22 includes, for example, a raw water pump control panel 31, a backwash pump control panel 32, a valve control panel 33, a water level control panel 34, and a water supply pump control panel 35. However, the control system 22 is not limited to combinations of these control panels, and the number and configuration of control panels are not limited as long as the system is capable of controlling the treatment of raw water and the supply of the treated water.

[0026] Each control panel comprises, for example, a communication unit, an input unit, an interface, a display unit, a storage unit, and a control unit. For example, each control panel is configured to be able to send and receive information via wired or wireless means through the communication unit, which is the interface. In addition, each control panel, or any of the control panels, is configured to be able to communicate with an external communication terminal via the communication unit.

[0027] The communication unit of each control panel communicates with an inspection communication terminal, for example, when the water treatment and water supply system 1 is shipped or during maintenance, to receive data such as functional parameters, internal parameters, and external parameters of the water treatment and water supply system 1, various programs for driving the raw water pump 10, backwash pump 17, and water supply pump 18, and managing the lifespan of the filtration tank 13, control programs for each component based on the water level signal from the water level detector 19, and change instructions to modify this data and programs, and transmits them to the storage unit and control unit.

[0028] The input section of each control panel is an input interface for receiving user input. The input section is, for example, an operation panel including buttons.

[0029] The interface of each control panel is selectively connected to the raw water pump 10, on-off valve 11, first switching valve 12, second switching valve 14, third switching valve 15, backwash pump 17, supply water pump 18, water level detector 19, and replenishment system valve 20. Furthermore, the interface can electrically connect to other equipment. In other words, the interface is a terminal or circuit to which various devices are electrically connected.

[0030] Each control panel's display unit includes, for example, a display device such as a segment display, liquid crystal display, or organic EL display, or a lighting unit using LEDs, etc.

[0031] The memory unit of each control panel is a storage medium capable of reading and writing data. The memory unit includes so-called memory or storage. The memory unit of each control panel stores data such as functional parameters, internal parameters, and external parameters used by the control unit in the processing performed by each control panel, data on the filter material of the filtration tank 13, and various data and programs used for controlling the raw water pump 10, on-off valve 11, first switching valve 12, second switching valve 14, third switching valve 15, backwash pump 17, and water supply pump 18, as well as for water level detection. The various data and programs stored in the memory unit are stored for each control panel, corresponding to the processing performed by each control panel.

[0032] The control unit of each control panel is, for example, a processor. The control unit is, for example, a microcontroller. However, the control unit is not limited to a microcontroller and may be a CPU, FPGA, DSP, DSC, or other general-purpose or dedicated processor. Also, if a module including a processor is used in the communication unit, the control unit may be that module. The control unit drives and controls the raw water pump 10, on-off valve 11, first switching valve 12, second switching valve 14, third switching valve 15, backwash pump 17, water supply pump 18, and replenishment system valve 20 based on various data and programs stored in the memory unit. The control unit also includes an inverter that controls the rotational speed of the raw water pump 10, backwash pump 17, and water supply pump 18 by varying the output frequency.

[0033] As a specific example, the raw water pump control panel 31 controls the operation of the raw water pump 10 based on the water level of the treated water tank 16 transmitted from the water level control panel 34. The raw water pump control panel 31 controls the operation of the raw water pump 10 based on data and programs related to the normal filtration and washing processes of raw water stored in the memory unit, as well as the water level in the treated water tank 16 detected by the water level detector 19 output from the water level control panel 34, and also outputs information for normal filtration to the valve control panel 33.

[0034] The backwash pump control panel 32 drives the backwash pump 17. Based on data related to the backwashing process stored in the memory unit, such as data on the filter material of the filtration tank 13, the operating time of the raw water pump 10 obtained from the raw water pump control panel 31, and parameters and programs related to the backwashing process, as well as the water level in the treatment tank 16 detected by the water level detector 19 output from the water level control panel 34, the backwash pump control panel 32 drives the backwash pump 17 and outputs information on the backwashing process to the valve control panel 33. Here, the backwashing process using the backwash pump 17 includes the temporary stopping of the backwash pump 17. Specifically, the backwash pump control panel 32 drives the backwash pump 17 when the conditions for executing the backwashing process are met and the water level in the treatment tank 16 is above the water level at which the backwash pump can be operated. Furthermore, when the backwash pump control panel 32 meets the conditions for terminating the backwash process, it stops the backwash pump 17, and when the water level in the treatment tank 16 falls below the backwash pump OFF level (second predetermined water level), it stops the backwash pump 17 as a temporary shutdown. In addition, if the water level in the treatment tank 16 reaches the backwash pump ON level while the backwash pump 17 is temporarily stopped during the backwash process, the backwash pump control panel 32 restarts the backwash pump 17, which had been temporarily stopped.

[0035] The valve control panel 33 switches the on / off valve 11, the first switching valve 12, the second switching valve 14, and the third switching valve 15 based on information such as the normal filtration process output from the raw water pump control panel 31, the backwashing process output from the backwash pump control panel 32, and the completion of the backwashing process.

[0036] As a specific example, during normal filtration, the valve control panel 33 opens the on-off valve 11, switches the first switching valve 12 to connect the raw water pump 10 and the filtration tank 13, and switches the second switching valve 14 and the third switching valve 15 to connect the filtration tank 13 and the treated water tank 16, as shown by the arrows in Figure 1. Also, during backwashing, the valve control panel 33 switches the first switching valve 12 to connect the filtration tank 13 and the backwash drain destination, as shown in Figure 2, and switches the second switching valve 14 and the third switching valve 15 to connect the backwash pump 17 (treated water tank 16) and the filtration tank 13. Furthermore, during washing, such as after backwashing, the valve control panel 33 opens the on-off valve 11, switches the first switching valve 12 to connect the raw water pump 10 and the filtration tank 13, and switches the second switching valve 14 and the third switching valve 15 to connect the filtration tank 13 and the washing drain destination.

[0037] The water level control panel 34 outputs the water level of the treated water tank 16, obtained from the water level detector 19, to the raw water pump control panel 31, the backwash pump control panel 32, and the valve control panel 33. Alternatively, the water level control panel 34 may be configured to output the water level of the treated water tank 16 to the water supply pump control panel 35. As a replenishment process, the water level control panel 34 opens and closes the replenishment system valve 20 based on the water level in the treated water tank 16. Specifically, when the water level in the treated water tank 16 falls below the replenishment system opening level (first predetermined water level), the water level control panel 34 switches the replenishment system valve 20 to open in order to supply water to the treated water tank 16 from the replenishment system, such as a water supply branch pipe. Furthermore, when the replenishment system valve 20 is open and the water level in the treated water tank 16 rises above the replenishment system closing level, the water level control panel 34 switches the replenishment system valve 20 to close in order to stop the water supply from the replenishment system.

[0038] The water supply pump control panel 35 drives the water supply pump 18. The water supply pump control panel 35 drives and controls the water supply pump 18 based on data related to water supply processing stored in the memory unit, such as pressure and flow rate acquired by sensors on the secondary side of the water supply pump 18, and parameters and programs related to water supply processing. Note that the water supply pump control panel 35 may be configured not to send or receive information with, for example, the raw water pump control panel 31, the backwash pump control panel 32, the valve control panel 33, and the water level control panel 34.

[0039] The control system 22, including these control panels, is a control device that selectively performs the following by controlling each component: a normal filtration process in which raw water supplied by the raw water pump 10 is filtered in the filtration tank 13; a backwashing process in which treated water is backflowed into the filtration tank 13 by the backwash pump 17 to clean the filtration tank 13; and a washing process in which the backwash water used for backwashing is drained from the filtration tank 13 after the backwashing process. The control system 22 is also a control device that supplies the treated water processed in the filtration tank 13 to the water supply destination.

[0040] For example, the control system 22 performs normal filtration when the water level in the treated water tank 16 reaches the level that drives the raw water pump 10 (raw water pump ON level), and stops normal filtration when the water level in the treated water tank 16 reaches the level that stops the raw water pump 10 (raw water pump OFF level), that is, when the treated water tank 16 is full.

[0041] Furthermore, for example, the control system 22 performs backwashing when the water level in the treatment tank 16 is higher than the water level at which the backwash pump 17 can be operated (backwash pump operation level) and the conditions for performing backwashing are met. The control system 22 then terminates the backwashing process when the conditions for terminating the backwashing process are met, or when the water level reaches the level at which the backwash pump 17 is stopped (backwash pump OFF level).

[0042] Here, the conditions for performing the backwashing process are, for example, the amount of raw water that has passed through the filtration tank 13, the time spent performing the normal filtration process, or a predetermined period or date and time. The conditions for performing the backwashing process are measured or timed from, for example, after the previous backwashing and washing process has been completed. The conditions for ending the backwashing process are, for example, the amount of treated water that has passed through the filtration tank 13 in reverse flow or the time spent performing the backwashing process. The conditions for ending the backwashing process are determined, for example, based on values ​​measured or timed from the start of the backwashing process.

[0043] Furthermore, the control system 22 opens the replenishment system valve 20 when the water level in the treated water tank 16 reaches the level that opens the replenishment system valve 20 (replenishment system open water level), and closes the replenishment system valve 20 when the water level in the treated water tank 16 reaches the level that closes the replenishment system valve 20 (replenishment system closed water level).

[0044] Next, an example of normal filtration, replenishment, and backwashing processes performed by the water treatment and water supply system 1 configured in this manner will be explained using explanatory diagrams in Figures 1 to 3 and flowcharts in Figures 4 to 6. In the following explanation, an example of the control performed by each control panel will be described, but the control panel performing the control is not limited as long as the water treatment and water supply system 1 can be controlled by the control system 22.

[0045] First, let's explain an example of a normal filtration process. As shown in Figure 4, when the power to the water treatment supply system 1 is turned ON (step ST11), the water level control panel 34 detects the water level in the treatment tank 16 and monitors the raw water pump ON level in the treatment tank 16 (step ST12). If the water level in the treatment tank 16 is higher than the raw water pump ON level that drives the raw water pump 10 (NO in step ST12), the water level control panel 34 continues to monitor the raw water pump ON level (step ST12). If the water level in the treatment tank 16 is below the raw water pump ON level (YES in step ST12), the water level control panel 34 outputs the water level information to the raw water pump control panel 31 and the valve control panel 33.

[0046] Next, the raw water pump control panel 31 and / or the valve control panel 33 monitor the water level information to see if a backwash signal is output in the backwash pump control panel 32 and / or the valve control panel 33, i.e., whether the backwash signal is ON (step ST13). If the backwash signal is ON (YES in step ST13), the valve control panel 33 controls the first switching valve 12, the second switching valve 14 and the third switching valve 15, and switches to a flow path that allows backwashing, as shown by the solid arrows in Figure 2, without switching to a flow path that allows normal filtration. If the backwash signal for backwashing is not output, i.e., the backwash signal is OFF (NO in step ST13), the valve control panel 33 controls the first switching valve 12, the second switching valve 14 and the third switching valve 15, and switches to a flow path that allows normal filtration, as shown by the arrows in Figure 1, to fluidically connect the raw water pump 10, the filtration tank 13 and the treated water tank 16. The raw water pump control panel 31 starts the raw water pump 10 (step ST14) and begins the normal filtration process.

[0047] Normally, after the filtration process starts, the valve control panel 33 monitors for backwash signals (step ST15). If no backwash signal is output from the backwash pump control panel 32 or the valve control panel 33 (backwash signal OFF), the valve control panel 33 monitors for backwash signals until a backwash signal is output (NO in step ST15). When a backwash signal is output from the backwash pump control panel 32 (backwash signal ON), the valve control panel 33 outputs a command to the raw water pump control panel 31 to stop the raw water pump 10. The raw water pump control panel 31 stops the raw water pump 10 in response to the command to stop the raw water pump 10 (step ST16). After the raw water pump 10 is stopped, the valve control panel 33 controls the first switching valve 12, the second switching valve 14, and the third switching valve 15 as shown by the solid arrows in Figure 2, and switches to a flow path that allows backwashing, as shown by the solid arrows in Figure 2. In step ST15, the raw water pump control panel 31 may monitor the backwash signal in addition to, or instead of, the valve control panel 33.

[0048] In addition, while the valve control panel 33 monitors the backwash signal in step ST15, the water level control panel 34 monitors the raw water pump OFF level of the treated water tank 16 (step ST17). If the water level in the treated water tank 16 is lower than the raw water pump OFF level (NO in step ST17), the water level control panel 34 continues to monitor the water level in the treated water tank 16. If the water level in the treated water tank 16 is at or above the raw water pump OFF level (YES in step ST17), the water level control panel 34 outputs information to the raw water pump control panel 31 indicating that the water level in the treated water tank 16 detected by the water level detector 19 is at or above the raw water pump OFF level. The raw water pump control panel 31 then considers the water level in the treated water tank 16 to be at the raw water pump OFF level, i.e., full, and stops the raw water pump 10 (step ST17).

[0049] As described above, the normal filtration process is performed as shown by the water flow indicated by the arrows in Figure 1. During the normal filtration process, the water supply pump control panel 35 performs water supply processing based on the pressure and / or flow rate on the secondary side of the water supply pump 18, and controls the supply and cessation of water supply to the secondary side.

[0050] Next, an example of the supply treatment of tap water to the treated water tank 16 by the supply system will be explained using Figures 2, 3, and 5.

[0051] First, as shown in Figure 5, when the power to the water treatment supply system 1 is turned ON (step ST21), the water level control panel 34 detects the water level in the treatment tank 16 and monitors the water level at which the replenishment system opens (step ST22). If the water level in the treatment tank 16 is higher than the water level at which the replenishment system opens (NO in step ST22), the water level control panel 34 continues to monitor the water level at which the replenishment system opens (step ST22). If the water level in the treatment tank 16 is below the water level at which the replenishment system opens (YES in step ST22), the water level control panel 34 opens the replenishment system valve 20 (step ST23). As a result, water is supplied from the replenishment system into the treatment tank 16.

[0052] When the replenishment system valve 20 is opened, the water level control panel 34 detects the water level in the treatment tank 16 and monitors the replenishment system closed water level in the treatment tank 16 (step ST24). If the water level in the treatment tank 16 is lower than the replenishment system closed water level (NO in step ST24), the water level control panel 34 continues to monitor the replenishment system closed water level (step ST24). If the water level in the treatment tank 16 is at or above the replenishment system open water level (YES in step ST24), the water level control panel 34 closes the replenishment system valve 20 (step ST25). In this way, during backwashing and / or water supply, the water level control panel 34 controls the supply and cessation of water from the replenishment system to the treatment tank 16 according to the water level in the treatment tank 16.

[0053] As a specific example, as shown by the solid lines and water levels in Figure 2, during the backwashing and water supply processes, if the water level in the treatment tank 16 is above the supply system opening water level, the water level control panel 34 keeps the supply system valve 20 closed while the backwashing and water supply processes are performed. As shown by the dashed lines in Figure 2, when the water level in the treatment tank 16 decreases due to the backwashing and water supply processes and falls below the supply system opening water level, the water level control panel 34 opens the supply system valve 20 and supplies water to the treatment tank 16 from the supply system, as shown by the dashed lines and arrows in Figure 2. Then, as shown by the solid lines in Figure 2, when the water level in the treatment tank 16 rises above the supply system closing water level, the water level control panel 34 closes the supply system valve 20.

[0054] Next, an example of backwashing will be described. As shown in Figure 6, when the power to the water treatment supply system 1 is turned ON (step ST31), the raw water pump control panel 31 starts the raw water pump 10 and performs normal filtration according to steps ST11 to ST17 described above.

[0055] Furthermore, the valve control panel 33 counts the amount of treated water processed in the treated water tank 16 during normal filtration. The amount of treated water may also be counted by the raw water pump control panel 31. The amount of treated water may also be counted during normal filtration, from the rotational speed of the raw water pump 10, or by detecting the flow rate.

[0056] Furthermore, the valve control panel 33 monitors the counted amount of treated water (step ST32). If the counted amount of treated water is less than the predetermined amount (NO in step ST32), the valve control panel 33 continues to monitor the amount of treated water. The predetermined amount is set in advance and stored in the memory unit. If the counted amount of treated water is equal to or greater than the predetermined amount (YES in step ST32), the valve control panel 33 turns on the backwash signal (step ST33). The water level control panel 34 detects the water level in the treated water tank 16 and monitors the water level at which the backwash pump can be operated in the treated water tank 16 (step ST34). If the water level in the treated water tank 16 is lower than the water level at which the backwash pump can be operated (NO in step ST34), the water level control panel 34 continues to monitor the water level at which the backwash pump can be operated (step ST34). If the water level in the treatment tank 16 is above the water level at which the backwash pump can be operated (YES in step ST34), the water level control panel 34 outputs water level information to the backwash pump control panel 32 and the valve control panel 33. The valve control panel 33 controls the first switching valve 12, the second switching valve 14, and the third switching valve 15, switching to a flow path that allows backwash operation as shown by the solid arrows in Figure 2, and the backwash pump control panel 32 starts the backwash pump 17 (step ST35). As a result, the backwash process begins.

[0057] After the backwashing process begins, the water level control panel 34 monitors the backwash pump OFF water level in the treatment tank 16 (step ST36). If the water level in the treatment tank 16 is higher than the backwash pump OFF water level (NO in step ST36), the water level control panel 34 continues to monitor the water level in the treatment tank 16. If the water level in the treatment tank 16 is below the backwash pump OFF water level (YES in step ST36), the backwash pump control panel 32 temporarily stops the driven backwash pump 17 (step ST37), returns to step ST34, and repeats the subsequent steps. When the water level reaches the backwash pump operation-enabled level, the backwashing process is resumed. At this point, when the water level in the treatment tank 16 is at the backwash pump OFF water level, the supply system is open, and water is supplied to the treatment tank 16 from the supply system, as shown by the arrows in Figure 3. Note that even if the backwash pump 17 is temporarily stopped, the supply of water from the supply system continues. Furthermore, even if the backwash pump control panel 32 temporarily stops the driven backwash pump 17, if the water level in the treated water tank 16 is higher than the drought level, the water supply pump control panel 35 will continue to control the drive of the water supply pump 18 and supply water, as shown by the arrow in Figure 3.

[0058] Furthermore, in step ST36, if the water level in the treatment tank 16 is higher than the backwash pump OFF water level (NO in step ST36), the backwash pump control panel 32, in parallel with monitoring the backwash pump OFF water level by the water level control panel 34, counts the time the backwash process is being performed (backwash time) after the start of the backwash process and monitors the predetermined backwash time (step ST38). If the counted backwash time is less than the predetermined backwash time (NO in step ST38), the process returns to step ST36 and continues monitoring the backwash pump OFF water level in the treatment tank 16. The predetermined backwash time is set in advance and stored in the memory unit. When the backwash time has elapsed to the predetermined backwash time (YES in step ST38), the backwash pump control panel 32 stops the backwash pump 17 (step ST39) and terminates the backwash process.

[0059] With the water treatment and water supply system 1 configured in this way, the treated water stored in the treated water tank 16 can be used for backwashing and water supply. Furthermore, during backwashing and water supply, when the water level in the treated water tank 16 falls below the water level of the supply system, water can be supplied to the treated water tank 16 from the supply system, such as a water branch pipe. As a result, since water can be supplied by the supply system, even if the treated water stored in the treated water tank 16 becomes insufficient when treated water is used for backwashing, water from the supply system can also be used for backwashing. Therefore, the water treatment and water supply system 1 can secure sufficient water for backwashing.

[0060] Furthermore, the water supplied from the supply system is not limited to use in backwashing; it can also be used for water supply by supplying water to the treatment tank 16 from the supply system according to the water shortage in the treatment tank 16. Thus, the water treatment and water supply system 1 can perform backwashing and water supply in parallel and prevent water outages. In addition, by configuring the water treatment and water supply system 1 to supply water to the treatment tank 16 from the supply system, it becomes possible to set the total amount of water used for backwashing to be greater than the amount of water (volume) of the treatment tank 16 when it is full, making it possible to miniaturize the treatment tank 16.

[0061] Furthermore, the water treatment and water supply system 1 can continue water treatment by temporarily stopping the backwash pump 17 when the water level in the treatment tank 16 reaches the backwash pump OFF level during backwashing, thereby preventing water outages and enabling a stable water supply. For example, during peak usage times when water demand is high at the water supply destination, the backwashing process using the treated water in the treatment tank 16 can be temporarily stopped to prioritize water supply to the destination.

[0062] Furthermore, the water treatment and supply system 1 is configured to immediately perform backwashing when the amount of treated water exceeds a predetermined amount during normal filtration and the water level in the treatment tank 16 reaches the level at which the backwash pump can be operated. This allows the water treatment and supply system 1 to minimize the risk of leakage while minimizing the number of backwashes.

[0063] According to the water treatment water supply system 1 of the above embodiment, when the water level of the replenishment system is reached, the replenishment system valve 20 is opened, and water is supplied from the replenishment system to the treatment water tank 16, thereby securing water for backwashing.

[0064] It should be noted that the water treatment and water supply system 1 is not limited to the example described above. For example, the configuration of the control system 22 described above can be changed as appropriate. For example, the opening and closing control of the replenishment system valve 20 may be directly performed by the water level control panel 34, or the water level control panel 34 may send a signal to the control means that performs the opening and closing control. Also, the multiple control panels described above are just examples, and the number and functions of the control panels are not limited as long as they can perform at least the functions described above. Furthermore, the arrangement of each component and the mechanical and structural descriptions of various valves etc. do not exclude other examples that cannot be recognized.

[0065] Furthermore, for example, even during backwashing, while the backwash pump is temporarily stopped, the raw water pump 10 can be operated to perform normal filtration and supply treated water to the treated water tank 16 in order to raise the water level from below the backwash pump OFF level to above the water level at which the backwash pump can operate. In the water supply treatment where treated water is supplied from the treated water tank 16 to the secondary side, by supplying treated water to the treated water tank 16 through normal filtration, separate from the water supply from the replenishment system, treated water used for water supply treatment or backwashing treatment can be quickly stored in the treated water tank 16.

[0066] Furthermore, in the example described above, when the water level in the treatment tank 16 falls below the supply system opening level during backwashing or water supply, the amount of treated water used in the treatment tank 16 is considered to have exceeded a predetermined amount, and the supply system valve 20 is opened to supply water to the treatment tank 16 from the supply system. However, the opening and closing control of the supply system valve 20 may be configured to predict the remaining water amount in the treatment tank 16 based on the amount of water supplied, such as the flow rate and rotation speed of the backwash pump 17 and / or water supply pump 18, rather than monitoring the water level in the treatment tank 16, and to open or close the supply system valve 20 accordingly. Also, the timing for opening the supply system valve 20 during backwashing may be when the backwash pump 17 is not running.

[0067] In other words, the present invention is not limited to the embodiments described above, and can be modified in various ways during implementation without departing from its essence. Furthermore, each embodiment may be combined as appropriate, and in that case, the combined effects can be obtained. Moreover, the above embodiments include various inventions, and various inventions can be extracted by selecting combinations from the multiple constituent elements disclosed. For example, if the problem can be solved and effects obtained even if some constituent elements are deleted from all the constituent elements shown in the embodiment, then the configuration with these deleted constituent elements can be extracted as an invention. [Explanation of symbols]

[0068] 1...Water treatment and water supply system, 10...Raw water pump, 11...On / off valve, 12...First switching valve, 13...Treatment tank, 14...Second switching valve, 15...Third switching valve, 16...Treatment tank, 17...Backwash pump, 18...Water supply pump, 19...Water level detector, 19a...Electrode rod, 20...Replenishment system valve, 21...Piping, 21A...First piping, 21B...Second piping, 21C...Third piping, 21D ...Pipe No. 4, 21E...Pipe No. 5, 21F...Pipe No. 6, 21G...Pipe No. 7, 21H...Pipe No. 8, 21I...Pipe No. 9, 21J...Pipe No. 10, 21K...Pipe No. 11, 21L...Pipe No. 12, 30...Control system (control device), 31...Raw water pump control panel, 32...Backwash pump control panel, 33...Valve control panel, 34...Water level control panel, 35...Water supply pump control panel.

Claims

1. Raw water pump and A filtration tank for treating the raw water supplied from the raw water pump, A treated water tank for storing treated water treated in the aforementioned filtration tank, A water supply pump that sends the treated water from the treated water tank to the water supply destination, A backwash pump that backflows the treated water from the treated water tank into the filtration tank for cleaning, A supply system valve that opens and closes a flow path for supplying water to the treatment tank from the supply system, During the backwashing process using the backwash pump, a control device opens the supply system valve and supplies water to the treatment tank from the supply system. A water treatment and water supply system equipped with the following features.

2. The water treatment and water supply system according to claim 1, wherein the control device opens the replenishment system valve when the water level in the treatment tank falls below a first predetermined water level during the backwashing process.

3. The water treatment and water supply system according to claim 2, wherein the control device stops the backwashing process when the water level falls below a second predetermined level, which is lower than the first predetermined water level, while performing the backwashing process and the water supply process that drives the water supply pump.

4. The water treatment and water supply system according to claim 1, wherein the total amount of water used for the backwashing process is greater than the amount of water in the treatment tank when it is full.

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