Water treatment apparatus, control device, operation method, and program

Abstract

The water treatment apparatus of the present application has: water treatment devices (205-1 to 205-4) arranged side by side; pumps (204-1 to 204-4) that supply treated water to the water treatment devices (205-1 to 205-4), respectively; and a control device (220) that controls the operation of the pumps (204-1 to 204-4) and the water treatment devices (205-1 to 205-4) so that the flow rate of treated water flowing from each of the water treatment devices (205-1 to 205-4) becomes a required flow rate corresponding to the amount of treated water supplied from the water treatment devices (205-1 to 205-4) to a supply destination.

Description

Technical Field

[0001] This invention relates to water treatment equipment, control devices, operating methods, and procedures. Background Technology

[0002] A water treatment system supplies the required amount of treated water to a point of use. The required amount of treated water at each point of use is not fixed. Therefore, the water treatment system is designed to supply the amount of treated water corresponding to the usage. For example, a technique has been disclosed that controls the discharge rate of a feed pump supplying raw water to an RO module for purifying pure water based on the consumption of pure water as treated water (see, for example, Patent Document 1). Furthermore, an apparatus for obtaining pure water using two reverse osmosis membrane modules arranged side-by-side has been disclosed, which stops the operation of one reverse osmosis membrane module based on the amount of pure water used (see, for example, Patent Document 2).

[0003] Existing technical documents Patent documents Patent Document 1: Japanese Patent Application Publication No. 11-104639 Patent Document 2: Japanese Patent Application Publication No. 2012-187446 Summary of the Invention

[0004] The technical problem that the invention aims to solve Typically, in water treatment devices such as reverse osmosis membrane modules, where lower flow rates result in lower water quality, the quality of the supplied treated water decreases when the technology described in Patent Document 1 is used when the amount of treated water used is low. Furthermore, as described in Patent Document 2, it is difficult to make fine adjustments to the flow rate when controlling the number of components being treated.

[0005] The purpose of this invention is to provide a water treatment apparatus, control device, operating method, and procedure capable of finely adjusting the supply of treated water without reducing the quality of the treated water.

[0006] Technical solutions for solving technical problems The water treatment equipment of the present invention has: Multiple water treatment units are arranged side by side. Multiple pumps supply water to be treated to the multiple water treatment devices; and A control device that controls the operation of the plurality of pumps and the plurality of water treatment devices to make the flow rate of treated water flowing out of the plurality of water treatment devices a required flow rate corresponding to the amount of treated water supplied from the plurality of water treatment devices to the supply destination.

[0007] Furthermore, the control device of the present invention has: The acquisition section, wherein the acquisition represents multiple flow rate values ​​of the flow rate of treated water flowing out from multiple water treatment devices arranged side by side; and The control unit controls the operation of the plurality of pumps and the plurality of water treatment devices, such that the flow rate represented by the plurality of flow rate values ​​obtained by the acquisition unit becomes the required flow rate corresponding to the amount of treated water supplied from the plurality of water treatment devices to the supply destination, wherein the plurality of pumps respectively supply the water to be treated to the plurality of water treatment devices.

[0008] Furthermore, the operation method of the present invention is performed as follows: The process of obtaining multiple flow rate values, each representing the flow rate of treated water exiting from multiple water treatment devices arranged side-by-side; and The operation of multiple pumps and multiple water treatment devices is controlled such that the flow rates represented by the multiple flow values ​​become the required flow rates corresponding to the amount of treated water supplied from the multiple water treatment devices to the supply destination, wherein the multiple pumps respectively supply the water to be treated to the multiple water treatment devices.

[0009] Furthermore, the program of this invention causes the computer to perform the following process: The process of obtaining multiple flow rate values, each representing the flow rate of treated water exiting from multiple water treatment devices arranged side-by-side; and The process of controlling the operation of multiple pumps and multiple water treatment devices such that the flow rates represented by the multiple flow values ​​become the required flow rates corresponding to the amount of treated water supplied from the multiple water treatment devices to the supply destination, wherein the multiple pumps respectively supply the water to be treated to the multiple water treatment devices.

[0010] Invention Effects In this invention, the supply of treated water can be finely adjusted without reducing the quality of the treated water. Attached Figure Description

[0011] Figure 1 This is a diagram illustrating an example of a water treatment system using the water treatment equipment according to the present invention.

[0012] Figure 2 It means applicable Figure 1 A diagram of a first embodiment of a primary pure water production system for a water treatment system is shown.

[0013] Figure 3 It means Figure 2 A diagram showing an example of the components of the control device.

[0014] Figure 4 It is used to describe by time series. Figure 2The diagram shows an example of the processing of the control device.

[0015] Figure 5 It is used to describe by time series. Figure 2 The diagram shows an example of the processing of the control device.

[0016] Figure 6 It is used for explanation Figure 2 The flowchart illustrates an example of a treatment process where the supply of treated water to the destination decreases, as shown in the operation method of the control device.

[0017] Figure 7 It is used for explanation Figure 2 The flowchart illustrates an example of a process in which the supply of treated water to the destination increases during the operation of the control device.

[0018] Figure 8 It means applicable Figure 1 A diagram of a second embodiment of the primary pure water production system of the water treatment system shown.

[0019] Figure 9 It means Figure 8 A diagram showing an example of the components of the control device.

[0020] Figure 10 It is used to describe by time series. Figure 8 The diagram shows an example of the processing of the control device.

[0021] Figure 11 It is used for explanation Figure 8 The flowchart illustrates an example of a process in which the supply of treated water to the destination increases during the operation of the control device. Detailed Implementation

[0022] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

[0023] Figure 1 This is a diagram illustrating an example of a water treatment system using the water treatment equipment according to the present invention. Figure 1The illustrated water treatment system comprises a pretreatment system 10, a primary pure water production system 20, and a subsystem 30. The pretreatment system 10 can be a system used in general water treatment systems. The pretreatment system 10 is a water treatment device that removes impurities such as turbidity and TOC (Total Organic Carbon) to supply treated water of appropriate quality for subsequent equipment. The primary pure water production system 20 performs prescribed treatment on the treated water from the pretreatment system 10 and supplies the treated water to the water treatment equipment in the subsystem 30. The subsystem 30 can be a secondary pure water production system used in general water treatment systems. The subsystem 30 is a water treatment device that removes trace amounts of ions and all organic carbon that were not completely removed by the primary pure water production system 20. The water treatment equipment according to this invention can be used for pure water production, ultrapure water production, wastewater recycling, sewage reuse, and seawater desalination. In particular, the water treatment equipment according to this invention is suitable for applications requiring high-purity water quality, such as pure water production and ultrapure water production.

[0024] (First Implementation) Figure 2 It means applicable Figure 1 A diagram showing a first embodiment of a primary pure water production system 20 for a water treatment system. (Applicable to...) Figure 1 In the primary pure water production system 20 of the water treatment system shown, such as Figure 2 As shown, the system includes an RO raw water tank 200, pumps 201, 204-1 to 204-4, 212, a filter 202, on / off valves 203, 207 to 209, 217, reverse osmosis (RO) membrane separation units 205-1 to 205-4, flow meters 206-1 to 206-4, 214-1 to 214-4, 215, an EDI raw water tank 210, a water level gauge 211, electro-deionized water production units 213-1 to 213-4, a demineralized water tank 216, and a control device 220. Furthermore, in... Figure 2 In the middle, only show Figure 1 The main components of the single-stage pure water production system 20 shown are those relevant to this method. For example, a water treatment device such as an ultraviolet oxidation device that decomposes organic matter in the water being treated by irradiating it with ultraviolet light may be installed before the electro-deionized water production apparatus 213-1 to 213-4. Furthermore, a water treatment device such as a membrane degassing device that removes dissolved gases such as oxygen and carbon dioxide may be installed before or after the electro-deionized water production apparatus 213-1 to 213-4.

[0025] The RO raw water tank 200 is a tank for storing liquid (treated water) that has been treated by the pretreatment system 10.

[0026] Pump 201 draws treated water stored in RO raw water tank 200 and supplies it to filter 202. An inverter is installed in pump 201. The inverter controls the drive frequency of pump 201, thereby controlling the discharge rate (the amount supplied to filter 202). Filter 202 removes impurities from the treated water supplied by pump 201.

[0027] Pumps 204-1 to 204-4 are respectively installed on four branch paths branching off from filter 202. Pumps 204-1 to 204-4 supply the treated water that has passed through filter 202 to the reverse osmosis membrane separators 205-1 to 205-4 installed on each branch path. Each of pumps 204-1 to 204-4 is equipped with an inverter device to adjust the supply. On / off valve 203 is installed on the branch path leading to pump 204-1. On / off valve 203 controls the supply of treated water to pump 204-1. On / off valve 208 controls the supply of treated water from reverse osmosis membrane separator 205-1 to EDI raw water tank 210. By controlling on / off valves 203 and 208, the reverse osmosis membrane separator 205-1 can be shut off.

[0028] Reverse osmosis membrane separation units 205-1 to 205-4 are water treatment devices respectively configured on branch paths of parallel branches from the RO raw water tank 200. For example, reverse osmosis membrane separation units 205-1 to 205-4 separate ions and TOC from the treated water supplied by pumps 204-1 to 204-4, dividing the treated water into permeate and concentrate. In this embodiment, reverse osmosis membrane separation units 205-1 to 205-4 are preferably devices that operate with a constant recovery rate relative to the permeate flow rate. Using an inverter and a pressure regulating valve (not shown) installed in the reverse osmosis membrane concentrate line, the recovery rate in reverse osmosis membrane separation units 205-1 to 205-4 is controlled to be constant. Reverse osmosis membrane separation units 205-1 to 205-4, with their recovery rates controlled to be constant, are devices where the quality of the treated water decreases as the amount of treated water (permeate) decreases. Any water treatment device with such properties (e.g., an electro-deionized water production device) can be configured to replace the reverse osmosis membrane separation devices 205-1 to 205-4 respectively.

[0029] Although the reverse osmosis membrane separation devices 205-1 to 205-4 in this method also depend on the quality of the raw water, they are generally designed for pure water applications with each 8-inch RO membrane measuring 1.0m. 3 The permeate flow rate is approximately 0.5 m / h. While this also depends on the composition of the RO membrane (such as sodium), if the permeate flow rate of each RO membrane is less than 0.5 m / h... 3If the flow rate is reduced by a certain percentage ( / h), the quality of the treated water will significantly decrease. When the reverse osmosis membrane separation units 205-1 to 205-4 each consist of three RO membranes, it is necessary to control the flow rate to ensure that the permeate flow rate of each of the reverse osmosis membrane separation units 205-1 to 205-4 is not less than 1.5 m³ / h. 3 / h.

[0030] Flow meters 206-1 to 206-4 measure the flow rate of the treated water (permeate water) flowing out of the reverse osmosis membrane separation units 205-1 to 205-4, respectively. Flow meters 206-1 to 206-4 then transmit the measured values ​​to the control unit 220.

[0031] On / off valve 207 is an on / off valve that switches the flow path of either the treated water flowing from reverse osmosis membrane separator 205-1 back to RO raw water tank 200 via a circulation path leading to RO raw water tank 200 or to a path leading to EDI raw water tank 210. On / off valve 207 is a three-way valve. Such three-way valves that switch the flow path of either the returned RO raw water tank 200 via a circulation path leading to RO raw water tank 200 or to a path leading to EDI raw water tank 210 can also be installed at the respective outlets of reverse osmosis membrane separators 205-1 to 205-4. On / off valve 209 is an on / off valve that supplies either a portion or all of the treated water flowing from reverse osmosis membrane separators 205-1 to 205-4 to EDI raw water tank 210. By controlling the opening and closing of on / off valves 207 and 209, the system controls whether the treated water flowing out of reverse osmosis membrane separators 205-1 to 205-4 is supplied to the EDI raw water tank 210 or returned to the RO raw water tank 200. Furthermore, by controlling the opening and closing of on / off valve 217, which is installed on the path leading to the return of the treated water flowing out of reverse osmosis membrane separators 205-1 to 205-4 to the RO raw water tank 200, and the opening and closing of on / off valve 209, which is installed on the path leading to the supply of the treated water flowing out of reverse osmosis membrane separators 205-1 to 205-4 to the EDI raw water tank 210, the system controls whether the treated water flowing out of reverse osmosis membrane separators 205-1 to 205-4 is supplied to the EDI raw water tank 210 or returned to the RO raw water tank 200. Furthermore, by controlling the opening degree of the on / off valve 217, a portion of the treated water flowing out from the reverse osmosis membrane separation units 205-1 to 205-4 is returned to the RO raw water tank 200. By circulating a portion of the treated water, the water quality can be further stabilized.

[0032] EDI raw water tank 210 is a tank for storing treated water from reverse osmosis membrane separation units 205-1 to 205-4 after they have been combined. Level gauge 211 is a level sensor that measures the water level of the treated water stored in EDI raw water tank 210. Level gauge 211 notifies the control unit 220 of the measured water level value. Pump 212 supplies the treated water stored in EDI raw water tank 210 to the electro-deionized water production units 213-1 to 213-4.

[0033] Electrodeionized water generating units 213-1 to 213-4 are respectively installed on four branch paths branching off from the path of pump 212. Electrodeionized water generating units 213-1 to 213-4 are typical EDI (electrodeionization) devices (electrodeionization water generating units) having desalination chambers, concentration chambers, and electrode chambers separated by cation exchange membranes and anion exchange membranes. A direct current is supplied to each of the electrodeionized water generating units 213-1 to 213-4, and while removing ions from the treated water supplied to each of the units in the desalination chambers, the ion exchange resins are continuously regenerated. The treated water with ions removed in each of the electrodeionized water generating units 213-1 to 213-4 is discharged as deionized water. On the other hand, a portion of the treated water is transported to the concentration chambers of the respective electro-deionized water production units 213-1 to 213-4, and is discharged from the respective electro-deionized water production units 213-1 to 213-4 as concentrated water with concentrated ions.

[0034] Flow meters 214-1 to 214-4 respectively measure the flow rate of treated water (deionized water) flowing out of the desalination chamber (pure water chamber) of each of the electro-deionized water production units 213-1 to 213-4. Flow meters 214-1 to 214-4 respectively notify the control device 220 of the measured values. Flow meter 215 measures the flow rate of treated water processed by the electro-deionized water production units 213-1 to 213-4 and merging from the branch paths. Flow meter 215 notifies the control device 220 of the measured values. Alternatively, instead of flow meters 214-1 to 214-4, the flow rate of the treated water can be calculated using, for example, the measurement results of a pressure gauge measuring the pressure of the treated water, the output value of the inverter of the pump conveying the treated water, and the opening value of the valve controlling the flow of the treated water, and the flow rate of the treated water can be notified to the control device 220. That is, there are no particular limitations on the means of measuring or calculating the flow rate of the treated water that is processed by the electro-deionized water production devices 213-1 to 213-4 and merges from the branch paths.

[0035] The desalination tank 216 is a tank for storing treated water that has been processed by the electro-deionized water production units 213-1 to 213-4 and then merged from branch paths.

[0036] exist Figure 2The example given is that the number of branch paths to reverse osmosis membrane separation units 205-1 to 205-4 and the number of branch paths to electro-deionized water production units 213-1 to 213-4 are both four, but this number is not specifically limited. Furthermore, Figure 2 Taking the case where one reverse osmosis membrane separation device is installed on each branch path from filter 202 to EDI raw water tank 210 as an example, the number can also be two, without particular limitation. Specifically, multiple reverse osmosis membrane separation devices can also be configured in series between each of pumps 204-1 to 204-4 and flow meters 206-1 to 206-4.

[0037] The control device 220 controls the opening and closing of pumps 204-1 to 204-4 and on / off valves 203 and 208, or the operation of reverse osmosis membrane separation device 205-1, based on the flow rate values ​​notified from flow meters 206-1 to 206-4 and the water level values ​​notified from water level gauge 211. Figure 3 It means Figure 2 A diagram showing an example of the constituent elements of the control device 220. (See diagram for example.) Figure 3 As shown, Figure 2 The control device 220 shown includes an acquisition unit 230 and a control unit 240. Furthermore, in Figure 3 The middle shows Figure 2 The main components of the control device 220 shown in this embodiment are the main components of the control device 220.

[0038] The acquisition unit 230 acquires flow rates from flow meters 206-1 to 206-4. Furthermore, if other flow meters are installed between the RO raw water tank 200 and the pump 212, the acquisition unit 230 can also acquire measured values ​​from those flow meters. Additionally, the acquisition unit 230 acquires water level values ​​from level gauge 211. Furthermore, the acquisition unit 230 acquires flow rates from flow meters 214-1 to 214-4. Additionally, the acquisition unit 230 acquires flow rates from flow meter 215. The acquisition unit 230 then transmits the acquired values ​​to the control unit 240.

[0039] The control unit 240 calculates the required flow rate of treated water to be supplied from the reverse osmosis membrane separation units 205-1 to 205-4 to the destination based on the water level value obtained by the acquisition unit 230 from the water level gauge 211. Specifically, the control unit 240 calculates the required flow rate of treated water requested (used) by the destination based on changes in the water level value obtained by the acquisition unit 230 from the water level gauge 211. For example, if the water level value obtained by the acquisition unit 230 from the water level gauge 211 increases, the amount of treated water used at the destination decreases. Therefore, the control unit 240 calculates the required flow rate of the decreased treated water to be supplied from the reverse osmosis membrane separation units 205-1 to 205-4 to the destination based on the increase in water level value. Furthermore, if the water level value obtained by the acquisition unit 230 from the water level gauge 211 decreases, the amount of treated water used at the destination increases. Therefore, the control unit 240 calculates the required flow rate of the increased treated water to be supplied from the reverse osmosis membrane separation units 205-1 to 205-4 to the supply destination based on the amount of water level reduction. Furthermore, the required flow rate can be calculated using proportional control, where the greater the deviation from the target value, the greater the flow rate fluctuation; alternatively, the flow rate can be divided into several stages, each with a corresponding value. The required flow rate is obtained by dividing this required flow rate by the number of operating reverse osmosis membrane separation units 205-1 to 205-4. Based on the calculated required flow rate, the control unit 240 controls the pumps 204-1 to 204-4 so that the flow rates indicated by the flow values ​​of the flow meters 206-1 to 206-4 obtained by the acquisition unit 230 become the required flow rates. Specifically, the control unit 240 controls the frequency of the inverters installed on pumps 204-1 to 204-4, thereby controlling the flow rate of the treated water supplied from pumps 204-1 to 204-4, so that the flow rates shown by the flow values ​​of flow meters 206-1 to 206-4 obtained by the acquisition unit 230 become the desired flow rates. Furthermore, the supply destination here is a point of use located after the electro-deionized water production apparatus 213-1 to 213-4. The supply destination can be the electro-deionized water production apparatus 213-1 to 213-4 themselves, water treatment devices (e.g., ultraviolet oxidation devices, ion exchange resin filling devices, membrane degassing devices, etc.) installed in the primary pure water production system other than the primary pure water production system 20, or devices and systems that have processed water using reverse osmosis membrane separation devices 205-1 to 205-4, such as tanks storing the treated water. Furthermore, the number of electro-deionized water production apparatuses, points of use, etc., that serve as supply destinations is not limited. This also applies to the following explanation.

[0040] Furthermore, if the calculated required flow rate (hereinafter referred to as threshold A) is lower than a preset first threshold, the control unit 240 stops the operation of at least one of the reverse osmosis membrane separation units 205-1 to 205-4. For example, if the calculated required flow rate is lower than threshold A, the control unit 240 may also control the on / off valves 203 and 208 to be closed, cutting off the reverse osmosis membrane separation unit 205-1 and stopping its operation. At this time, the control unit 240 may also control the on / off valve 207 to switch the treated water flowing out of the reverse osmosis membrane separation unit 205-1 to a flow path that returns to the RO raw water tank 200 via a circulation path leading to the RO raw water tank 200.

[0041] After stopping the operation of at least one of the reverse osmosis membrane separation units 205-1 to 205-4, if the calculated required flow rate is above a preset second threshold (hereinafter referred to as threshold B), the control unit 240 restarts the operation of the stopped reverse osmosis membrane separation unit. This threshold B is a value larger than threshold A. For example, the control unit 240 may also stop the operation of reverse osmosis membrane separation unit 205-1 by controlling the on / off valves 203 and 208 to the closed state, and then restart the operation of reverse osmosis membrane separation unit 205-1 by controlling the on / off valves 203 and 208 to the open state if the calculated required flow rate is above threshold B.

[0042] The following specific examples illustrate the processing of the control device 220. Figure 4 and Figure 5 It is used to describe by time series. Figure 2 The diagram shows an example of the processing of the control device 220. In the following description, the threshold A mentioned above is 2.0 (m 3 / h), threshold B is 3.5 (m 3 / h). From the viewpoint of water quality stabilization, thresholds A and B are set to 60-140% of the preset treatment water volume, preferably 75-125%, and more preferably 80-120%. By narrowing the threshold width, stable water quality can be obtained. The branch path of reverse osmosis membrane separation unit 205-1 is designated as system A. Furthermore, the branch path of reverse osmosis membrane separation unit 205-2 is designated as system B. Furthermore, the branch path of reverse osmosis membrane separation unit 205-3 is designated as system C. Furthermore, the branch path of reverse osmosis membrane separation unit 205-4 is designated as system D. In the initial state, all reverse osmosis membrane separation units 205-1 to 205-4 are operated. Furthermore, each of reverse osmosis membrane separation units 205-1 to 205-4 consists of three 8-inch RO membrane elements. Furthermore, the typical permeate flow rate of each 8-inch RO membrane element is 1.11 m³ / h. 3 / h (three lines total 3.33m) 3 Taking the case of ( / h) as an example. Furthermore, the recovery rate (flow rate measured by flow meters 206-1 to 206-4 / water supply to reverse osmosis membrane separation units 205-1 to 205-4) is 80%. Furthermore, the recovery rate (flow rate measured by flow meters 214-1 to 214-4 / water supply to deionized water production units 213-1 to 213-4) is 90%.

[0043] First, such as Figure 4 As shown in Table (a), the flow rate of the demineralized water, which is the required flow rate, is 12 (m³ / s). 3 In the case of ( / h), the required flow rate of demineralized water from EDI is obtained by dividing the required flow rate by the number of operating systems: 12 ÷ 4 = 3.0 (m³ / h). 3 / h). The required flow rate at this time can also be the flow rate value obtained by the acquisition unit 230 from the flow meter 215. Alternatively, the required flow rate at this time can be the value calculated by the control unit 240 based on the water level value obtained by the acquisition unit 230 from the water level gauge 211 and the recovery rates of the respective electro-deionized water production units 213-1 to 213-4. If the control unit 240 uses the cross-sectional area of ​​the EDI raw water tank 210 and the water level value obtained by the acquisition unit 230 from the water level gauge 211, it can calculate the amount of treated water supplied to the destination. The control unit 240 calculates the required flow rate of the deionized water from the EDI for each system based on the calculated required flow rate of the deionized water from the EDI for each system and the recovery rates of each electro-deionized water production unit 213-1 to 213-4. Specifically, the required flow rate of the RO permeate from each system is 3.0 ÷ 90 (%) = 3.33 (m³). 3 / h).

[0044] The control unit 240 controls the frequencies of pumps 204-1 to 204-4 respectively, so that the flow rate value obtained by the acquisition unit 230 from the flow meters 206-1 to 206-4 is 3.33 (m³). 3 / h). The control unit 240 compares the calculated required flow rate with the threshold A. At this time, the calculated required flow rate is not lower than the threshold A.

[0045] Next, as Figure 4 As shown in Table (b), if the flow rate of the demineralized water required is 10 (m³ / s) 3 The required flow rate of demineralized water from the EDI is calculated by dividing the required flow rate by the number of operating systems: 10 ÷ 4 = 2.5 (m³ / h). 3 / h). The required flow rate at this time can also be the flow rate value obtained by the acquisition unit 230 from the flow meter 215. Alternatively, the required flow rate at this time can be a value calculated by the control unit 240 based on the water level value obtained by the acquisition unit 230 from the water level gauge 211 and the recovery rates of the respective electro-deionized water production units 213-1 to 213-4. The control unit 240 calculates the required flow rate of the RO permeate from each system based on the calculated required flow rate of the deionized water from the EDI for each system and the recovery rates of each electro-deionized water production unit 213-1 to 213-4. Specifically, the required flow rate of the RO permeate from each system is 2.5 ÷ 90 (%) = 2.78 (m³ / h). 3 / h).

[0046] The control unit 240 controls the frequencies of pumps 204-1 to 204-4 respectively, so that the flow rate value obtained by the acquisition unit 230 from the flow meters 206-1 to 206-4 is 2.78 (m³ / s). 3 / h). The control unit 240 compares the calculated required flow rate with the threshold A. At this time, the calculated required flow rate is not lower than the threshold A.

[0047] Next, as Figure 4 As shown in Table (c), if the flow rate of the demineralized water required is 7 (m³ / s), 3 The required flow rate of demineralized water from the EDI is calculated by dividing the required flow rate by the number of operating systems: 7 ÷ 4 = 1.75 (m³ / h). 3 / h). The required flow rate at this time can also be the flow rate value obtained by the acquisition unit 230 from the flow meter 215. Alternatively, the required flow rate at this time can be a value calculated by the control unit 240 based on the water level value obtained by the acquisition unit 230 from the water level gauge 211 and the respective recovery rates of the electro-deionized water production units 213-1 to 213-4. The control unit 240 calculates the required flow rate of the RO permeate from each system based on the calculated required flow rate of the deionized water from the EDI for each system and the respective recovery rates of the electro-deionized water production units 213-1 to 213-4. Specifically, the required flow rate of the RO permeate from each system is: 1.75 ÷ 90 (%) = 1.94 (m³ / h). 3 / h). The control unit 240 controls the frequency of pumps 204-1 to 204-4 respectively, so that the flow rate value obtained by the acquisition unit 230 from the flow meters 206-1 to 206-4 is 1.94 (m³ / h). 3 / h). The control unit 240 compares the calculated required flow rate with the threshold A. Since the calculated required flow rate is lower than the threshold A, the control unit 240 decides to shut down one system (in this case, system A of the reverse osmosis membrane separation unit 205-1) to stop operation. Figure 4As shown in Table (d), before the control unit 240 shuts off system A (stopping the operation of the reverse osmosis membrane separation unit 205-1), in order to ensure the flow rate of demineralized water 7 (m³) 3 / h), respectively control the frequency of pumps 204-2 to 204-4 so that the flow rate obtained by the acquisition unit 230 from flow meters 206-2 to 206-4 is: 7 ÷ 90% ÷ 3 = 2.59 (m³ / h). 3 / h). Here, while the control unit 240 cuts off system A, the frequencies of pumps 204-2 to 204-4 can be controlled respectively, so that the flow rate values ​​obtained by the acquisition unit 230 from flow meters 206-2 to 206-4 are respectively 1.94 (m³ / h). 3 / h) becomes 2.59 (m) 3 / h). For safety reasons, the control unit 240 preferably controls the frequencies of pumps 204 to 204-4 respectively before shutting off system A, so that the flow rates obtained from flow meters 206 to 206-4 are 2.59 (m³ / h). 3 / h).

[0048] Next, as Figure 4 As shown in Table (e), the control unit 240 shuts off system A. At this time, the control unit 240 controls the on / off valves 203 and 208 to be closed, preventing the treated water from flowing to the reverse osmosis membrane separator 205-1. At this time, the control unit 240 can also control the on / off valve 207 to switch the treated water flowing out of the reverse osmosis membrane separator 205-1 to a flow path returning to the RO raw water tank 200 via a circulation path to the RO raw water tank 200. Furthermore, the control unit 240 can also stop the operation of the reverse osmosis membrane separator 205-1. During the period when the reverse osmosis membrane separator 205-1 is shut off in this state, the control unit 240 can allow the treated water to be introduced into the reverse osmosis membrane separator 205-1 at any time and any frequency. By introducing water into the shut-off reverse osmosis membrane separator 205-1, water retention during shutdown can be suppressed, accelerating the restart of the reverse osmosis membrane separator 205-1. At this time, it is preferable to circulate the treated water discharged from the reverse osmosis membrane separator 205-1 in the RO raw water tank 200. The inlet pressure of the reverse osmosis membrane separator 205-1 during circulation is 0.5 MPa or less, preferably 0.3 MPa or less. Furthermore, the higher the recovery rate in the reverse osmosis membrane separator 205-1, the higher the water quality and pressure of the treated water circulating from the reverse osmosis membrane separator 205-1.

[0049] After that, as Figure 5 As shown in Table (a), if the flow rate of the demineralized water required is 12 (m³ / s), 3 / h), then the required flow rate of demineralized water from EDI, obtained by dividing the required flow rate by the number of operating systems, is: 12 ÷ 4 = 3 (m3 / h). The required flow rate at this time can also be the flow rate value obtained by the acquisition unit 230 from the flow meter 215. Alternatively, the required flow rate at this time can also be the value calculated by the control unit 240 based on the water level value obtained by the acquisition unit 230 from the water level gauge 211 and the recovery rate of each of the electro-deionized water production units 213-1 to 213-4. The control unit 240 calculates the required flow rate of the permeate water from the RO system for each system based on the calculated required flow rate of the deionized water from the EDI for each system and the recovery rate of each electro-deionized water production unit 213-1 to 213-4. Specifically, the required flow rate of the RO permeate water from each system is: 3 × 4 ÷ 90 (%) ÷ 3 = 4.44 (m³ / h). 3 / h). The control unit 240 controls the frequency of pumps 204-2 to 204-4 respectively, so that the flow rate value obtained by the acquisition unit 230 from the flow meters 206-2 to 206-4 is 4.44 (m³ / h). 3 / h). The control unit 240 compares the calculated required flow rate with the threshold B. Since the calculated required flow rate is above the threshold B, the control unit 240 decides to restart the operation of the system (system A of the reverse osmosis membrane separation unit 205-1) that was shut down.

[0050] like Figure 5 As shown in Table (b), the control unit 240 controls the on / off valves 203 and 208 of the system (system A of the reverse osmosis membrane separator 205-1) that has been shut down due to disconnection to be in the open state, so that the operation of the reverse osmosis membrane separator 205-1 can be restarted. If the on / off state of the on / off valve 207 is such that the treated water flowing out of the reverse osmosis membrane separator 205-1 returns to the RO raw water tank 200 via the circulation path to the RO raw water tank 200, then the control unit 240 controls the on / off valve 207 to make the treated water flowing out of the reverse osmosis membrane separator 205-1 flow to the path leading to the EDI raw water tank 210. At this time, the control unit 240 controls the frequency of the pump 204-1 so that the flow rate obtained by the acquisition unit 230 from the flow meter 206-1 is 4.44 (m³). 3 / h). Furthermore, the control unit 240 can also control the frequency of the pump 204-1 so that the flow rate value obtained by the acquisition unit 230 from the flow meter 206-1 is 4.44 (m³ / h). 3 Values ​​other than / h). In addition, after the control unit 240 controls the on / off valves 203 and 208 of the system that have been shut down to be in the open state (and also controls the on / off state of the on / off valve 207 if necessary), the control unit 240 can perform the operation of discharging and returning the raw water to the circulation path within a specified period.

[0051] After the four systems A through D begin operating, as follows: Figure 5As shown in Table (c), the control unit 240 controls the frequencies of pumps 204-1 to 204-4 respectively, so that the flow rate values ​​obtained by the acquisition unit 230 from flow meters 206-1 to 206-4 are: 12 ÷ 90 (%) ÷ 4 = 3.33 (m³). 3 / h).

[0052] The aforementioned threshold A is a threshold used to prevent a decrease in the quality of treated water due to insufficient flow to the reverse osmosis membrane separation units 205-1 to 205-4. Furthermore, threshold B is a threshold used to prevent damage to the reverse osmosis membrane separation units 205-1 to 205-4 due to excessive flow to them.

[0053] The following is about Figure 2 The operation method of the control device 220 shown will be explained. Figure 6 It is used for explanation Figure 2 The flowchart illustrates an example of a treatment process when the supply of treated water to the destination decreases, as shown in the operation method of the control device 220. The specific treatment in this process utilizes... Figure 4 The processing of the description.

[0054] First, after water is introduced into the reverse osmosis membrane separation units 205-1 to 205-4, the acquisition unit 230 acquires the water level value of the treated water stored in the EDI raw water tank 210 from the water level gauge 211 (step S1). Based on the water level value acquired by the acquisition unit 230, the control unit 240 calculates the change in the supply amount to the destination of the treated water (step S2). The control unit 240 determines whether the supply amount to the destination of the treated water has decreased (step S3). If the supply amount to the destination of the treated water has decreased, the control unit 240 calculates the required flow rate based on the calculated change, and calculates the aforementioned required flow rate. The control unit 240 reduces the frequency of each of the pumps 204-1 to 204-4 so that the flow rate values ​​acquired by the acquisition unit 230 from the flow meters 206-1 to 206-4 respectively become values ​​representing the calculated required flow rate (step S4). The control unit 240 determines whether the calculated required flow rate is lower than a threshold A (step S5). If the calculated required flow rate is lower than threshold A, the control unit 240 increases the frequency of each of pumps 204-1 to 204-4 (step S6). At this time, the control unit 240 does not need to increase the frequency of all pumps 204-1 to 204-4; it only needs to increase the frequency of pumps other than those in the series that are being stopped. Next, the control unit 240 shuts off a portion of the reverse osmosis membrane separation unit to stop its operation (step S7). Here, the control unit 240 controls the on / off valves 203 and 208 to the closed state to shut off the reverse osmosis membrane separation unit 205-1, stopping its operation. At this time, the control unit 240 can also control the on / off valve 207 to switch the treated water flowing out of the reverse osmosis membrane separation unit 205-1 to a flow path that returns to the RO raw water tank 200 via a circulation path leading to the RO raw water tank 200.

[0055] In step S3, if the supply amount to the destination of the treated water remains unchanged, the processing described in step S1 is performed. Furthermore, in step S3, if the supply amount to the destination of the treated water increases, the processing described later (using...) is performed. Figure 7 (The processing of the description).

[0056] Figure 7 It is used for explanation Figure 2 The flowchart illustrates an example of a process in which the supply of treated water to the destination increases, as part of the operation of the control device 220. The specific process in this flow involves using... Figure 5 The following instructions describe the process starting from the state where the reverse osmosis membrane separation unit 205-1 has stopped operating.

[0057] First, the acquisition unit 230 acquires the water level value of the treated water stored in the EDI raw water tank 210 from the water level gauge 211 (step S11). Based on the water level value acquired by the acquisition unit 230, the control unit 240 calculates the change in the supply amount to the destination of the treated water (step S12). The control unit 240 determines whether the supply amount to the destination of the treated water has increased (step S13). If the supply amount to the destination of the treated water has increased, the control unit 240 calculates the required flow rate based on the calculated change, and calculates the aforementioned required flow rate. The control unit 240 increases the frequency of each of the pumps 204 to 204-4 so that the flow rate values ​​acquired from the flow meters 206 to 206-4 respectively become values ​​representing the calculated required flow rate (step S14). The control unit 240 determines whether the calculated required flow rate is above or below threshold B (step S15). If the calculated required flow rate is above or below threshold B, the control unit 240 restarts the operation of the reverse osmosis membrane separation unit 205-1, which has been shut down (step S16). Next, the control unit 240 reduces the frequency of each of the pumps 204-2 to 204-4, so that the flow rate values ​​obtained by the acquisition unit 230 from the flow meters 206-1 to 206-4 become the required flow rate corresponding to the number of reverse osmosis membrane separation units 205-1 to 205-4 in operation (step S17).

[0058] In step S13, if the supply amount to the destination of the treated water remains unchanged, the processing described in step S11 is performed. Furthermore, in step S13, if the supply amount to the destination of the treated water decreases, the aforementioned processing is performed (using...). Figure 6 (The processing of the description).

[0059] In this method, the control device 220 controls the flow rate of each of the multiple water treatment devices arranged in parallel according to the usage at the destination of the treated water supply. If the required flow rate of each controlled water treatment device is lower than threshold A, the control device 220 stops the operation of a portion of the multiple water treatment devices. Furthermore, after stopping the operation of a portion of the water treatment devices, if the required flow rate of each controlled water treatment device becomes higher than threshold B, the control device 220 restarts the operation of the stopped water treatment devices. Thus, fine adjustments to the supply of treated water can be made without degrading the quality of the treated water. Furthermore, multiple thresholds can be set, and the number of water treatment devices stopped by the control device 220 can increase as the required flow rate decreases. For example, if the required flow rate of each water treatment unit is lower than threshold A, the control device 220 stops the operation of one water treatment unit. Then, if the required flow rate of each water treatment unit is lower than threshold A (i.e., threshold A1), the control device 220 stops the operation of another water treatment unit. Then, if the required flow rate of each water treatment unit is lower than threshold A2 (i.e., threshold A1), the control device 220 stops the operation of yet another water treatment unit. In this case, three thresholds can also be set to restart operation. The control device 220 restarts operation sequentially based on the increase in required flow rate and the comparison results between the required flow rate and each of the three thresholds.

[0060] (Second Implementation) Figure 8 It means applicable Figure 1 A diagram of a second embodiment of the primary pure water production system 21 of the water treatment system shown. Figure 8 The pure water production system 21 shown replaces... Figure 1 The water treatment system shown is equipped with a primary pure water production system 20. For example... Figure 8 As shown, the primary pure water production system 21 includes an RO raw water tank 200, pumps 201, 204-204-4, 212, a filter 202, on / off valves 203, 207-209, 217, a reverse osmosis membrane separation (RO) device 205-205-4, flow meters 206-206-4, 214-214-4, 215, an EDI raw water tank 210, a water level gauge 211, an electro-deionized water production device 213-213-4, a demineralized water tank 216, and a control device 221. Furthermore, in... Figure 8 In the text, only those applied to Figure 1The main components of the primary pure water production system 21 of the water treatment system shown are those relevant to this method. For example, a water treatment device such as an ultraviolet oxidation device that decomposes organic matter in the water to be treated by irradiating it with ultraviolet light may be installed upstream of the electro-deionized water production devices 213-1 to 213-4. Furthermore, a water treatment device such as a membrane degassing device for removing dissolved oxygen may be installed downstream of the electro-deionized water production devices 213-1 to 213-4.

[0061] The RO raw water tank 200, pumps 201, 204-204-4, 212, filter 202, on / off valves 203, 207-209, 217, reverse osmosis membrane separation (RO) device 205-205-4, flow meters 206-206-4, 214-214-4, 215, EDI raw water tank 210, water level gauge 211, electro-deionized water production device 213-213-4, and demineralized water tank 216 are the same as those in the first embodiment.

[0062] The control device 221 controls the opening and closing of pumps 204-1 to 204-4 and on / off valves 203 and 208, or the operation of reverse osmosis membrane separation device 205-1, based on the flow rate values ​​notified from flow meters 206-1 to 206-4 and the water level values ​​notified from water level gauge 211. Figure 9 It means Figure 8 A diagram showing an example of the constituent elements of the control device 221. (See diagram for example.) Figure 9 As shown, Figure 8 The control device 221 shown includes an acquisition unit 230 and a control unit 241. Furthermore, in Figure 9 The middle shows Figure 8 The main components of the control device 221 shown in this embodiment are as follows. The acquisition unit 230 is the same as that in the first embodiment.

[0063] Based on the water level value obtained by the acquisition unit 230 from the water level gauge 211, the control unit 241 calculates the required flow rate of treated water to be supplied from the reverse osmosis membrane separation units 205-1 to 205-4 to the supply destination. The specific calculation method can be the same as that in the first embodiment. The required flow rate is obtained by dividing this required flow rate by the number of operating reverse osmosis membrane separation units 205-1 to 205-4. Based on the calculated required flow rate, the control unit 241 controls the pumps 204-1 to 204-4 so that the flow rates indicated by the flow rates obtained by the acquisition unit 230 from the flow meters 206-1 to 206-4 become the required flow rates. The specific control method can be the same as that in the first embodiment.

[0064] Furthermore, if the calculated required flow rate is lower than a preset threshold A, the control unit 241 stops the operation of at least one of the reverse osmosis membrane separation devices 205-1 to 205-4. For example, if the calculated required flow rate is lower than threshold A, the control unit 241 may also control the on / off valves 203 and 208 to be closed, cutting off the reverse osmosis membrane separation device 205-1 and stopping its operation. At this time, the control unit 241 may also control the on / off valve 207 to switch the treated water flowing out of the reverse osmosis membrane separation device 205-1 to a flow path that returns to the RO raw water tank 200 via a circulation path leading to the RO raw water tank 200.

[0065] After stopping the operation of at least one of the reverse osmosis membrane separation devices 205-1 to 205-4, the control unit 241, even if the operation of the stopped reverse osmosis membrane separation device is restarted, will restart the operation of the stopped reverse osmosis membrane separation device if the calculated required flow rate is above the threshold A. For example, the control unit 241 may also control the on / off valves 203 and 208 to the closed state to cut off the reverse osmosis membrane separation device 205-1, and after stopping the operation of the reverse osmosis membrane separation device 205-1, even if the operation of the stopped reverse osmosis membrane separation device is restarted, will control the on / off valves 203 and 208 to the open state to restart the operation of the reverse osmosis membrane separation device 205-1 if the calculated required flow rate is above the threshold A. If the open / closed state of the on / close valve 207 is such that the treated water flowing out of the reverse osmosis membrane separator 205-1 becomes a flow path that returns to the RO raw water tank 200 via the circulation path leading to the RO raw water tank 200, then the control unit 241 controls the on / close valve 207 to make the treated water flowing out of the reverse osmosis membrane separator 205-1 flow to the path leading to the EDI raw water tank 210.

[0066] The following specific examples illustrate the processing of the control device 221. The processing of the control device 221 when the calculated required flow rate is lower than a preset threshold A can be the same as the processing of the control device 220 in the first embodiment. Figure 10 It is used to describe by time series. Figure 8 The diagram shows an example of the processing of the control device 221. In the following description, the threshold A mentioned above is 2.0 (m 3 / h). The branch path of reverse osmosis membrane separation unit 205-1 is designated as system A. Furthermore, the branch path of reverse osmosis membrane separation unit 205-2 is designated as system B. Furthermore, the branch path of reverse osmosis membrane separation unit 205-3 is designated as system C. Furthermore, the branch path of reverse osmosis membrane separation unit 205-4 is designated as system D. In the initial state, the operation of reverse osmosis membrane separation unit 205-1 is stopped, and reverse osmosis membrane separation units 205-2 to 205-4 are in operation.

[0067] like Figure 10 As shown in Table (a), with the reverse osmosis membrane separation unit 205-1 stopped, the flow rate of the deionized water, which is the required flow rate, is 10 (m³ / s). 3 In the case of ( / h), the required flow rate of demineralized water from EDI, obtained by dividing the required flow rate by the number of operating systems, is set as: 10 ÷ 4 = 2.5 (m³ / h). 3 / h). The required flow rate at this time can also be the flow rate value obtained by the acquisition unit 230 from the flow meter 215. Alternatively, the required flow rate at this time can be a value calculated by the control unit 241 based on the water level value obtained by the acquisition unit 230 from the water level gauge 211 and the recovery rates of the respective electro-deionized water production units 213-1 to 213-4. The control unit 241 calculates the required flow rate of the deionized water from the EDI for each system based on the calculated required flow rate of the deionized water from the EDI for each system and the recovery rates of each electro-deionized water production unit 213-1 to 213-4. Specifically, the required flow rate of the RO permeate from each system is: 2.5 × 4 ÷ 90 (%) ÷ 3 = 3.7 (m³ / h). 3 / h). The control unit 241 controls the frequency of pumps 204-2 to 204-4 respectively, so that the flow rate value obtained by the acquisition unit 230 from the flow meters 206-2 to 206-4 is 3.7 (m³ / h). 3 / h).

[0068] In addition, the control unit 241 calculates that 10 (m³) of water will be supplied from the four reverse osmosis membrane separation units 205-1 to 205-4. 3 The required flow rates for each of the reverse osmosis membrane separation units 205-1 to 205-4 when treating water (permeate) at a flow rate of 2.5 × 4 ÷ 90 (%) ÷ 4 = 2.78 (m³ / h) 3 / h). The control unit 241 compares the calculated required flow rate with the threshold A. The calculated required flow rate is above the threshold A. Therefore, the control unit 241 decides to restart the operation of the system (system A of the reverse osmosis membrane separation unit 205-1) that was shut down by the cut-off.

[0069] like Figure 10As shown in Table (b), the control unit 241 controls the on / off valves 203 and 208 of the system (system A of the reverse osmosis membrane separation unit 205-1) that were shut down due to disconnection to be in the open state (and also controls the opening / closing state of the on / off valve 207 if necessary), so that the operation of the reverse osmosis membrane separation unit 205-1 can be restarted. At this time, the control unit 241 controls the frequency of the pump 204-1 so that the flow rate obtained by the acquisition unit 230 from the flow meter 206-1 is 3.7 (m³). 3 / h). Furthermore, the control unit 241 can also control the frequency of the pump 204-1 so that the flow rate value obtained by the acquisition unit 230 from the flow meter 206-1 is 3.7 (m³ / h). 3 Values ​​other than / h).

[0070] After the four systems A through D begin operating, as follows: Figure 10 As shown in Table (c), the control unit 241 controls the frequencies of pumps 204-1 to 204-4 respectively, so that the flow rate values ​​obtained by the acquisition unit 230 from flow meters 206-1 to 206-4 are respectively: 2.5 × 4 ÷ 90 (%) ÷ 4 = 2.78 (m³). 3 / h).

[0071] The following is about Figure 8 The operation method of the control device 221 shown will be explained. Figure 8 The treatment method in the operation of the control device 221 shown, when the supply of treated water to the supply destination decreases, can be the same as the treatment in the first embodiment. Figure 11 It is used for explanation Figure 8 The flowchart illustrates an example of a process in which the supply of treated water to the destination increases during the operation of the control device 221. The specific process in this flowchart utilizes... Figure 10 The following instructions describe the process starting from the state where the reverse osmosis membrane separation unit 205-1 has stopped operating.

[0072] First, the acquisition unit 230 acquires the water level value of the treated water stored in the EDI raw water tank 210 from the water level gauge 211 (step S21). Based on the water level value acquired by the acquisition unit 230, the control unit 241 calculates the change in the supply amount to the destination of the treated water (step S22). The control unit 241 determines whether the supply amount to the destination of the treated water has increased (step S23). If the supply amount to the destination of the treated water has increased, the control unit 241 calculates the required flow rate based on the calculated change, and calculates the aforementioned required flow rate. The control unit 241 increases the frequency of each of the pumps 204 to 204-4 so that the flow rate values ​​acquired from the flow meters 206 to 206-4 respectively become values ​​representing the calculated required flow rate (step S24).

[0073] Furthermore, the control unit 241 calculates the required flow rate for each of the four reverse osmosis membrane separation units 205-1 to 205-4 when restarting operation of the stopped reverse osmosis membrane separation unit 205-1 to 205-4, supplying the required flow rate of treated water. The control unit 241 determines whether the calculated required flow rate is above threshold A (step S25). If the calculated required flow rate is above threshold A, the control unit 241 restarts the operation of the stopped reverse osmosis membrane separation unit 205-1 (step S26). Next, the control unit 241 reduces the frequency of each of the pumps 204-2 to 204-4, so that the flow rate values ​​obtained by the acquisition unit 230 from the flow meters 206-1 to 206-4 become the required flow rate corresponding to the number of operating reverse osmosis membrane separation units 205-1 to 205-4 (step S27).

[0074] In step S23, if the supply amount to the destination of the treated water remains unchanged, the process described in step S21 is performed. Furthermore, in step S23, if the supply amount to the destination of the treated water decreases, the aforementioned process is performed.

[0075] In this method, the control device 221 controls the flow rate of each of the multiple water treatment devices arranged in parallel according to the usage at the destination of the treated water supply. If the required flow rate of each controlled water treatment device is lower than a threshold A, the control device 221 stops the operation of a portion of the multiple water treatment devices. Furthermore, if, after stopping the operation of some water treatment devices, the required flow rate increases, and the required flow rate of each water treatment device that was stopped exceeds the threshold A, the control device 221 restarts the operation of the stopped water treatment devices. Thus, fine adjustments to the supply of treated water can be made without degrading the quality of the treated water. Furthermore, since only one threshold is used, control is simplified.

[0076] The above explanation illustrates how each component undertakes its respective function (processing), but this allocation is not limited to the above. Furthermore, the above method is merely one example regarding the structure of the components and is not limited thereto.

[0077] The processing performed by the control devices 220 and 221 can also be performed by logic circuits made separately according to their respective purposes. Alternatively, a computer program (hereinafter referred to as a program) describing the processing content in sequence can be stored on a storage medium that can be read by the control devices 220 and 221 respectively, so that the control devices 220 and 221 can read and execute the program stored on the storage medium. Storage media that can be read by the control devices 220 and 221 include removable storage media such as floppy disks, optical disks, DVDs (Digital Versatile Discs), CDs (Compact Discs), Blu-ray discs, USB (Universal Serial Bus) memory, and SD cards. In addition, it also refers to memory such as ROMs (Read Only Memory), RAMs (Random Access Memory), and HDDs (Hard Disc Drives) built into the control devices 220 and 221 respectively. The program stored in the storage medium is read by a CPU (not shown) respectively installed in control devices 220 and 221, and the same processing as described above is performed under the control of the CPU. Here, the CPU operates as a computer that executes the program read from the storage medium containing the program.

[0078] While the present invention has been described above with reference to embodiments, the present invention is not limited to the above embodiments. Various modifications that can be understood by those skilled in the art can be made to the structure or details of the present invention within the scope of the present invention.

[0079] This application claims priority based on Japanese Application Special Hoc 2024-49326, filed on March 26, 2024, the entire contents of which are incorporated herein by reference.

Claims

1. A water treatment device, comprising: Multiple water treatment units are arranged side by side. Multiple pumps supply water to be treated to the multiple water treatment devices, respectively. as well as A control device that controls the operation of the plurality of pumps and the plurality of water treatment devices to make the flow rate of treated water flowing out of the plurality of water treatment devices a required flow rate corresponding to the amount of treated water supplied from the plurality of water treatment devices to the supply destination.

2. The water treatment equipment according to claim 1, wherein, The water treatment equipment has the following features: A water tank, which stores treated water supplied from the plurality of water treatment units to the supply destination; and A water level gauge is used to measure the water level of the treated water stored in the tank. The control device calculates the required flow rate based on the water level measured by the water level gauge.

3. The water treatment equipment according to claim 1 or 2, wherein, If the required flow rate is lower than a first threshold, the control device stops the operation of at least one of the plurality of water treatment devices.

4. The water treatment equipment according to claim 3, wherein, After stopping the operation of at least one of the plurality of water treatment devices, the control device restarts the operation of the water treatment device if the required flow rate becomes above a second threshold, wherein the second threshold is a value greater than the first threshold.

5. The water treatment equipment according to claim 4, wherein, After stopping the operation of at least one of the plurality of water treatment devices, the control device restarts the operation of the water treatment device even if the required flow rate is above the first threshold when the operation of the water treatment device is restarted.

6. The water treatment equipment according to claim 4, wherein, Before stopping the operation of at least one of the plurality of water treatment devices, the control device increases the supply from the plurality of pumps to the water treatment devices other than the one that stops the operation.

7. The water treatment equipment according to claim 1 or 2, wherein, The aforementioned multiple water treatment devices are reverse osmosis membrane separation devices or electro-deionized water production devices that treat water whose quality decreases as the flow rate decreases.

8. The water treatment equipment according to claim 7, wherein, The control device initiates the flow of water to the reverse osmosis membrane separation device or the electro-deionized water production device. If the required flow rate is lower than a first threshold, it stops the operation of at least one of the water treatment devices in the reverse osmosis membrane separation device and the electro-deionized water production device. After stopping the operation of at least one of the reverse osmosis membrane separation device or the electro-deionized water production device, if the required flow rate becomes higher than a second threshold, it restarts the operation of the stopped reverse osmosis membrane separation device or the electro-deionized water production device. The second threshold is a value greater than the first threshold.

9. The water treatment equipment according to claim 1 or 2, wherein, The water treatment equipment has the following features: A water tank, which is located upstream of the plurality of pumps; and An on / off valve is positioned on the path that returns the treated water flowing from the plurality of water treatment devices to the water tank. The control device controls the opening and closing or the degree of opening of the on / off valve, so that at least a portion of the treated water flowing out from the plurality of water treatment devices is returned to the water tank.

10. A control device comprising: The acquisition section, wherein the acquisition represents multiple flow rate values ​​of the flow rate of treated water flowing out from multiple water treatment devices arranged side by side; and The control unit controls the operation of the plurality of pumps and the plurality of water treatment devices, such that the flow rate represented by the plurality of flow rate values ​​obtained by the acquisition unit becomes the required flow rate corresponding to the amount of treated water supplied from the plurality of water treatment devices to the supply destination, wherein the plurality of pumps respectively supply the water to be treated to the plurality of water treatment devices.

11. An operating method comprising the following processing: The process of obtaining multiple flow rate values, each representing the flow rate of treated water exiting from multiple water treatment devices arranged side-by-side; and The operation of multiple pumps and multiple water treatment devices is controlled such that the flow rates represented by the multiple flow rate values ​​become the required flow rate corresponding to the amount of treated water supplied from the multiple water treatment devices to the supply destination. The plurality of pumps respectively supply the water to be treated to the plurality of water treatment devices.

12. A program that causes a computer to perform the following procedure: The process of obtaining multiple flow rate values, each representing the flow rate of treated water exiting from multiple water treatment devices arranged side-by-side; and The process of controlling the operation of multiple pumps and multiple water treatment devices such that the flow rates represented by the multiple flow values ​​become the required flow rates corresponding to the amount of treated water supplied from the multiple water treatment devices to the supply destination. The plurality of pumps respectively supply the water to be treated to the plurality of water treatment devices.

Images