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

Abstract

To easily stabilize treated water.SOLUTION: The water treatment system includes an RO device 10, an RO device 11 for treating water treated by the RO device 10, a control device 100, and a plurality of pumps 1,20 and 20-2 and inverters 1,21 and 21-2 for adjusting the supply of water to be treated to the RO device 10 and the supply of treated water to the RO device 11 using parameters set by the control device 100, wherein the control device 100 sets predetermined parameters to the inverters 1,21 and 21-2, respectively. A flow rate value indicating the flow rate of treated water from an RO device 10 or an RO device 11 is acquired, a predetermined parameter is set in each of inverters 1,21 and 21-2, a parameter to be set in an inverter 21-1 is changed on the basis of the acquired flow rate value, and the changed parameter is set in the inverter 21-1.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a water treatment facility, a control device, an operation method, and a program. [Background technology]

[0002] In order to stabilize the flow rate of treated water from a reverse osmosis membrane device (RO membrane device), a device has been devised that calculates the drive frequency of a pressure pump that controls the supply of water to be treated to the RO membrane device based on the flow rate of treated water detected by a flow sensor installed at the outlet of the RO membrane device (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2013-066819 Summary of the Invention [Problem to be solved by the invention]

[0004] In the above-described system, when water treatment devices including RO membrane devices are configured in multiple stages, parameters such as the drive frequency of the supply mechanism such as a pump that supplies water to each water treatment device must be calculated and set for each supply mechanism, which poses the problem of complex calculations and a long time required to stabilize the treated water.

[0005] An object of the present invention is to provide a water treatment facility, a control device, an operating method, and a program that can easily stabilize treated water. [Means for solving the problem]

[0006] The water treatment facility of the present invention comprises: A reverse osmosis membrane device; a water treatment device for treating treated water from the reverse osmosis membrane device; a control device; a first adjusting unit that adjusts the supply of the water to be treated to the reverse osmosis membrane device using parameters set by the control device; a second adjusting unit that adjusts the supply of the treated water to the water treatment device using parameters set by the control device, The control device a parameter setting unit that sets predetermined parameters in the first adjustment unit and the second adjustment unit; a flow rate value acquiring unit that acquires a flow rate value indicating a flow rate of treated water from the reverse osmosis membrane device or the water treatment device; a change unit that changes the parameter to be set in the first adjustment unit based on the flow rate value acquired by the flow rate value acquisition unit after the parameter setting unit sets the predetermined parameters in each of the first adjustment unit and the second adjustment unit, The parameter setting unit sets the parameters changed by the change unit in the first adjustment unit.

[0007] The control device of the present invention also includes: a parameter setting unit that sets predetermined parameters for a first adjustment unit that adjusts the supply of water to be treated to the reverse osmosis membrane device and a second adjustment unit that adjusts the supply of the treated water to a water treatment device that treats the treated water from the reverse osmosis membrane device; a flow rate value acquiring unit that acquires a flow rate value indicating a flow rate of treated water from the reverse osmosis membrane device or the water treatment device; a change unit that changes the parameter to be set in the first adjustment unit based on the flow rate value acquired by the flow rate value acquisition unit after the parameter setting unit sets the predetermined parameters in each of the first adjustment unit and the second adjustment unit, The parameter setting unit sets the parameters changed by the change unit in the first adjustment unit.

[0008] Further, the operating method of the present invention includes the steps of: a process of setting predetermined parameters in a first adjusting unit that adjusts the supply of water to be treated to a reverse osmosis membrane device and a second adjusting unit that adjusts the supply of the treated water to a water treatment device that treats the treated water from the reverse osmosis membrane device; A process of acquiring a flow rate value indicating a flow rate of treated water from the reverse osmosis membrane device or the water treatment device; a process of setting the predetermined parameters for each of the first adjustment unit and the second adjustment unit, and then changing the parameters to be set for the first adjustment unit based on the acquired flow rate value; The changed parameters are set in the first adjustment unit.

[0009] The program of the present invention also includes: On the computer, a step of setting predetermined parameters in a first adjusting unit that adjusts the supply of water to be treated to a reverse osmosis membrane device and a second adjusting unit that adjusts the supply of the treated water to a water treatment device that treats the treated water from the reverse osmosis membrane device; acquiring a flow rate value indicating a flow rate of treated water from the reverse osmosis membrane device or the water treatment device; a step of setting the predetermined parameters for each of the first adjustment unit and the second adjustment unit, and then changing the parameters to be set for the first adjustment unit based on the acquired flow rate value; and a procedure of setting the changed parameters in the first adjustment unit of the reverse osmosis membrane device. [Effects of the Invention]

[0010] In the present invention, the treated water can be easily stabilized. [Brief explanation of the drawings]

[0011] [Figure 1] 1 is a diagram showing an example of a water treatment system to which the water treatment facility according to the present invention is applied. [Figure 2] FIG. 2 is a diagram showing a first embodiment of a water treatment facility that is applied to the water treatment system shown in FIG. [Figure 3] 3 is a diagram illustrating an example of components included in the control device illustrated in FIG. 2. FIG. [Figure 4] 3 is a flowchart illustrating an example of a method for operating the water treatment facility shown in FIG. 2. [Figure 5] 5 is a flowchart illustrating an example of detailed processing of step S7 shown in FIG. 4. [Figure 6] 1. FIG. 4 is a diagram showing a second embodiment of a water treatment facility that is applied to the water treatment system shown in FIG. [Figure 7] 7 is a diagram illustrating an example of components included in the control device illustrated in FIG. 6. FIG. [Figure 8] 7 is a flowchart illustrating an example of a method for operating the water treatment facility shown in FIG. 6. [Figure 9] 9 is a flowchart illustrating an example of detailed processing of step S17 shown in FIG. 8. [Figure 10] 1. FIG. 4 is a diagram showing a third embodiment of a water treatment facility that is applied to the water treatment system shown in FIG. [Figure 11] 11 is a diagram illustrating an example of components included in the control device illustrated in FIG. 10. FIG. [Figure 12] 11 is a flowchart illustrating an example of a method for operating the water treatment facility shown in FIG. [Figure 13] 13 is a flowchart illustrating an example of detailed processing of step S27 shown in FIG. 12. DETAILED DESCRIPTION OF THE INVENTION

[0012] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0013] FIG. 1 is a diagram showing an example of a water treatment system to which the water treatment equipment of the present invention is applied. The water treatment system shown in FIG. 1 includes a pretreatment system 1, a primary pure water production system 2, and a subsystem 3. The pretreatment system 1 may be a system used in a general water treatment system and is a water treatment facility that removes impurities such as turbidity and TOC (total organic carbon) so that treated water of suitable quality can be supplied to downstream equipment. The primary pure water production system 2 is a water treatment facility that performs a predetermined treatment on the treated water treated in the pretreatment system 1 and supplies the treated water to the subsystem 3. The subsystem 3 may be a secondary pure water production system used in a general water treatment system and is a water treatment facility that removes trace amounts of ions and total organic carbon that could not be completely removed in the primary pure water production system 2. The water treatment equipment of the present invention can be used for pure water production, ultrapure water production, wastewater reclamation, sewage reuse, and seawater desalination. In particular, the water treatment equipment of the present invention is suitable for pure water production and ultrapure water production, which require high-purity water quality. (First embodiment)

[0014] Fig. 2 is a diagram showing a first embodiment of a water treatment facility that is applied to the water treatment system shown in Fig. 1. The water treatment facility in this embodiment is provided in the primary pure water producing system 2 shown in Fig. 1. As shown in Fig. 2, the water treatment facility in this embodiment includes RO devices 10 and 11 that are reverse osmosis membrane devices, pumps 20-1 and 20-2, inverters 21-1 and 21-2, a flow meter 30, on-off valves 40 and 41, and a control device 100.

[0015] The pump 20-1 supplies the water to be treated from the previous stage to the RO device 10. If a water tank storing the water to be treated is provided upstream of the pump 20-1, the pump 20-1 pumps up the water to be treated stored in the water tank and supplies it to the RO device 10. The pump 20-1 is provided with an inverter 21-1, and the drive frequency (number of rotations) of the pump 20-1 is controlled by the inverter 21-1, thereby controlling the discharge rate (amount supplied to the RO device 10). The inverter 21-1 controls the drive frequency of the pump 20-1 based on parameters set by the control device 100. The pump 20-1 and the inverter 21-1 constitute a first adjustment unit.

[0016] The pump 20-2 supplies treated water (permeated water) from the RO device 10 to the RO device 11. If a water tank storing treated water (permeated water) from the RO device 10 is provided upstream of the pump 20-2, the pump 20-2 pumps up the treated water stored in the water tank and supplies it to the RO device 11. The pump 20-2 is provided with an inverter 21-2, and the drive frequency (number of rotations) of the pump 20-2 is controlled by the inverter 21-2, thereby controlling the discharge rate (amount supplied to the RO device 11). The inverter 21-2 controls the drive frequency of the pump 20-2 based on parameters set by the control device 100. The pump 20-2 and the inverter 21-2 constitute a second adjustment unit.

[0017] Each of the RO devices 10 and 11 separates, for example, ions and TOC from the water to be treated supplied from pumps 20-1 and 20-2, respectively, and divides the water into permeate and concentrated water. The recovery rates in the RO devices 10 and 11 are controlled by adjusting the apertures of on-off valves 40 and 41, which control the flow rates of the concentrated water from the RO devices 10 and 11, respectively. At this time, a flow meter is provided in the path of the concentrated water. In this embodiment, the RO device 11 is arranged as a water treatment device.

[0018] The flow meter 30 measures the flow rate of treated water (permeate) flowing out from the RO device 11. The flow meter 30 notifies the control device 100 of a flow rate value indicating the measured flow rate. The flow meter 30 may also measure the flow rate of treated water (permeate) flowing out from the RO device 10.

[0019] Fig. 3 is a diagram showing an example of components included in the control device 100 shown in Fig. 2. As shown in Fig. 3, the control device 100 shown in Fig. 2 has a parameter acquisition unit 110, a parameter setting unit 120, a flow rate value acquisition unit 130, and a change unit 140. Note that Fig. 3 shows only the main components related to this embodiment among the components included in the control device 100 shown in Fig. 2.

[0020] The parameter acquisition unit 110 acquires parameters corresponding to a desired flow rate value (target flow rate value). These parameters are set by the parameter setting unit 120 for each of the inverters 21-1 and 21-2. The parameters acquired by the parameter acquisition unit 110 are numerical values ​​determined in association with the flow rate value based on test runs, experiments, and past statistical data. The parameters acquired by the parameter acquisition unit 110 may be stored in a database accessible to the control device 100, may be held in a device from which the control device 100 can acquire the parameters, or may be input to and acquired by the control device 100 based on an operation performed externally using a touch panel or the like provided on the control device 100. The parameter acquisition unit 110 outputs the acquired parameters to the parameter setting unit 120.

[0021] The parameter setting unit 120 sets the parameters output from the parameter acquisition unit 110 to the inverters 21-1 and 21-2, respectively. The parameter setting unit 120 also sets the parameters changed by the change unit 140 to the inverter 21-1.

[0022] The flow rate value acquiring unit 130 acquires the flow rate value notified from the flow meter 30. The flow rate value acquiring unit 130 notifies the changing unit 140 of the acquired flow rate value.

[0023] After the parameter setting unit 120 sets the parameters output from the parameter acquisition unit 110 to the inverters 21-1 and 21-2, the change unit 140 changes the parameters to be set to the inverter 21-1 based on the flow rate value acquired by the flow rate value acquisition unit 130. At this time, the change unit 140 calculates the difference between the flow rate value notified by the flow rate value acquisition unit 130 and a preset reference flow rate value. If the calculated difference exceeds a threshold value, the change unit 140 changes the parameters to be set to the inverter 21-1. Specifically, if the difference between the flow rate value notified by the flow rate value acquisition unit 130 and the reference flow rate value exceeds the threshold value and the flow rate value notified by the flow rate value acquisition unit 130 is lower than the reference flow rate value, the change unit 140 changes the parameters to be set to the inverter 21-1 to parameters that increase the amount of water to be treated supplied from the pump 20-1. On the other hand, when the difference between the flow rate value notified by the flow rate value acquisition unit 130 and the reference flow rate value exceeds a threshold value and the flow rate value notified by the flow rate value acquisition unit 130 exceeds the reference flow rate value, the change unit 140 changes the parameter set in the inverter 21-1 to a parameter that reduces the amount of water to be treated supplied from the pump 20-1. The reference flow rate value may be the target flow rate value described above, or may be a value calculated based on the target flow rate value, the configuration of the water treatment facility, etc.

[0024] The following describes a method for operating the water treatment facility shown in Fig. 2. Fig. 4 is a flowchart for explaining an example of a method for operating the water treatment facility shown in Fig. 2.

[0025] First, when a target flow rate value is set (step S1), the parameter acquisition unit 110 acquires parameters corresponding to the target flow rate value (step S2). The parameter setting unit 120 sets the parameters acquired by the parameter acquisition unit 110 to each of the inverters 21-1 and 21-2 (step S3). After that, water flow to the RO devices 10 and 11 begins, and the flow rate value acquisition unit 130 acquires the flow rate value measured by the flow meter 30 (step S4). The timing at which the flow rate value acquisition unit 130 acquires the flow rate value measured by the flow meter 30 may be the timing when a predetermined time (e.g., 2 to 3 minutes) has elapsed since water flow to the RO devices 10 and 11 began. Alternatively, the timing at which the flow rate value acquisition unit 130 acquires the flow rate value measured by the flow meter 30 may be the timing at which the water quality of the treated water from the RO device 11 reaches a value that satisfies a preset condition. This condition may be, for example, that the value indicating the water quality of the treated water from the RO device 11 is equal to or less than a predetermined threshold, or that the fluctuation range per unit time of the value indicating the water quality of the treated water from the RO device 11 is equal to or less than a predetermined range. Next, the change unit 140 calculates the difference between the flow rate value acquired by the flow rate value acquisition unit 130 and the reference flow rate value (step S5). The timing for the change unit 140 to calculate the difference may be the timing when the flow rate value acquisition unit 130 acquires the flow rate value, or the timing when the fluctuation range per unit time of the flow rate value acquired by the flow rate value acquisition unit 130 becomes equal to or less than a predetermined range. The change unit 140 compares the calculated difference with a threshold and determines whether the calculated difference exceeds the threshold (step S6). If the calculated difference exceeds the threshold, the change unit 140 changes the parameters set in the inverter 21-1 (step S7).

[0026] 5 is a flowchart for explaining an example of the detailed processing of step S7 shown in FIG. 4. The change unit 140 determines whether the flow rate value acquired by the flow rate value acquisition unit 130 is smaller than the reference flow rate value (step S701). If the flow rate value acquired by the flow rate value acquisition unit 130 is smaller than the reference flow rate value, the change unit 140 changes the parameter to one that increases the drive frequency of the inverter 21-1 (step S702). On the other hand, if the flow rate value acquired by the flow rate value acquisition unit 130 is not smaller than the reference flow rate value, the change unit 140 changes the parameter to one that decreases the drive frequency of the inverter 21-1 (step S703). The parameter setting unit 120 sets the parameter changed by the change unit 140 in step S702 or step S703 to the inverter 21-1 (step S704).

[0027] In this embodiment, in a configuration in which a reverse osmosis membrane device is provided downstream of a reverse osmosis membrane device as a water treatment device, predetermined parameters are set for the adjustment units that adjust the flow rate to the reverse osmosis membrane device and the water treatment device, respectively, and water flow is initiated. Then, the control device 100 changes the drive frequency of the pump, which adjusts the flow rate to the reverse osmosis membrane device, according to the flow rate of treated water from the water treatment device. This allows water to be passed at a target flow rate more easily and quickly than by adjusting the flow rates of both the reverse osmosis membrane device and the water treatment device located downstream. Furthermore, because the flow rate parameters of the downstream reverse osmosis membrane device are not changed, fluctuations in water quality due to flow rate control can be minimized. In this way, treated water can be easily stabilized. Note that an electrodeionized water production system (EDI system) may be provided as a water treatment device instead of the RO system 11. (Second embodiment)

[0028] FIG. 6 is a diagram showing a second embodiment of a water treatment facility that can be applied to the water treatment system shown in FIG. 1. The water treatment facility of this embodiment is provided in the primary pure water producing system 2 shown in FIG. 1. As shown in FIG. 6, the water treatment facility of this embodiment includes RO devices 10 and 11, which are reverse osmosis membrane devices, a flow meter 30, on-off valves 40, 41, 50-1 and 50-2, valve adjustment units 51-1 and 51-2, and a control device 101. The RO devices 10 and 11, the flow meter 30, and the on-off valves 40 and 41 are the same as those in the first embodiment. In this embodiment, on-off valves 50-1 and 50-2 and valve adjustment units 51-1 and 51-2 are provided instead of the pumps 20-1 and 20-2 and the inverters 21-1 and 21-2, respectively, that were provided as adjustment units in the first embodiment. In this embodiment, the RO device 11 is arranged as a water treatment device.

[0029] The on-off valve 50-1 is a flow rate adjustment valve that adjusts the flow rate of the water to be treated from the previous stage to the RO device 10. The valve adjustment unit 51-1 adjusts the opening degree of the on-off valve 50-1 based on parameters set by the control device 101. The on-off valve 50-1 and the valve adjustment unit 51-1 constitute a first adjustment unit.

[0030] The on-off valve 50-2 is a flow rate adjustment valve that adjusts the flow rate of treated water (permeate) from the RO device 10 to the RO device 11. The valve adjustment unit 51-2 adjusts the opening degree of the on-off valve 50-2 based on parameters set by the control device 101. The on-off valve 50-2 and the valve adjustment unit 51-2 constitute a second adjustment unit.

[0031] Fig. 7 is a diagram showing an example of components included in the control device 101 shown in Fig. 6. As shown in Fig. 7, the control device 101 shown in Fig. 6 has a parameter acquisition unit 111, a parameter setting unit 121, a flow rate value acquisition unit 130, and a change unit 141. The flow rate value acquisition unit 130 is the same as that in the first embodiment. Note that Fig. 7 shows only the main components related to this embodiment among the components included in the control device 101 shown in Fig. 6.

[0032] The parameter acquisition unit 111 acquires parameters that the parameter setting unit 121 sets for each of the valve adjustment units 51-1 and 51-2. The parameters acquired by the parameter acquisition unit 111 are numerical values ​​that are determined in association with flow rate values ​​based on test runs, experiments, and past statistical data. The parameters acquired by the parameter acquisition unit 111 may be stored in a database accessible to the control device 101, or may be held in a device that the control device 101 can acquire. The parameter acquisition unit 111 outputs the acquired parameters to the parameter setting unit 121.

[0033] The parameter setting unit 121 sets the parameters output from the parameter acquisition unit 111 to the valve adjustment units 51-1 and 51-2, respectively. The parameter setting unit 121 also sets the parameters changed by the change unit 141 to the valve adjustment unit 51-1.

[0034] After the parameter setting unit 121 sets the parameters output from the parameter acquisition unit 111 in each of the valve adjustment units 51-1 and 51-2, the change unit 141 changes the parameters to be set in the valve adjustment unit 51-1 based on the flow rate value acquired by the flow rate value acquisition unit 130. At this time, the change unit 141 calculates the difference between the flow rate value notified by the flow rate value acquisition unit 130 and a preset reference flow rate value. If the calculated difference exceeds a threshold, the change unit 141 changes the parameters to be set in the valve adjustment unit 51-1. Specifically, if the difference between the flow rate value notified by the flow rate value acquisition unit 130 and the reference flow rate value exceeds the threshold and the flow rate value notified by the flow rate value acquisition unit 130 is lower than the reference flow rate value, the change unit 141 changes the parameters to be set in the valve adjustment unit 51-1 to parameters that increase the amount of water to be treated supplied from the on-off valve 50-1. On the other hand, when the difference between the flow rate value notified by the flow rate value acquisition unit 130 and the reference flow rate value exceeds the threshold value and the flow rate value notified by the flow rate value acquisition unit 130 exceeds the reference flow rate value, the change unit 141 changes the parameter set in the valve adjustment unit 51-1 to a parameter that reduces the amount of water to be treated supplied from the on-off valve 50-1. The reference flow rate value may be the target flow rate value described above, or may be a value calculated based on the target flow rate value, the configuration of the water treatment facility, etc.

[0035] The following describes a method for operating the water treatment facility shown in Fig. 6. Fig. 8 is a flowchart for explaining an example of a method for operating the water treatment facility shown in Fig. 6.

[0036] First, when a target flow rate value is set (step S11), the parameter acquisition unit 111 acquires parameters corresponding to the target flow rate value (step S12). The parameter setting unit 121 sets the parameters acquired by the parameter acquisition unit 111 to the valve adjustment units 51-1 and 51-2 (step S13). After that, water flow to the RO devices 10 and 11 begins, and the flow rate value acquisition unit 130 acquires the flow rate value measured by the flow meter 30 (step S14). The timing at which the flow rate value acquisition unit 130 acquires the flow rate value measured by the flow meter 30 may be the timing when a predetermined time (e.g., 2 to 3 minutes) has elapsed since water flow to the RO devices 10 and 11 began. Alternatively, the timing at which the flow rate value acquisition unit 130 acquires the flow rate value measured by the flow meter 30 may be the timing when the water quality of the treated water from the RO device 11 reaches a value that satisfies a preset condition. This condition may be the condition described in the first embodiment. Next, the change unit 141 calculates the difference between the flow rate value acquired by the flow rate value acquisition unit 130 and the reference flow rate value (step S15). The timing at which the change unit 141 calculates the difference may be the same as the timing at which the change unit 140 calculates the difference in the first embodiment. The change unit 141 compares the calculated difference with a threshold value and determines whether the calculated difference exceeds the threshold value (step S16). If the calculated difference exceeds the threshold value, the change unit 141 changes the parameters set in the valve adjustment unit 51-1 (step S17).

[0037] 9 is a flowchart for explaining an example of the detailed processing of step S17 shown in FIG. 8. The change unit 141 determines whether the flow rate value acquired by the flow rate value acquisition unit 130 is smaller than the reference flow rate value (step S711). If the flow rate value acquired by the flow rate value acquisition unit 130 is smaller than the reference flow rate value, the change unit 141 changes the parameter to one that increases the opening degree of the on-off valve 50-1 (step S712). On the other hand, if the flow rate value acquired by the flow rate value acquisition unit 130 is not smaller than the reference flow rate value, the change unit 141 changes the parameter to one that decreases the opening degree of the on-off valve 50-1 (step S713). The parameter setting unit 121 sets the parameter changed by the change unit 141 in step S712 or step S713 to the valve adjustment unit 51-1 (step S714).

[0038] In this embodiment, in a configuration in which a reverse osmosis membrane device is provided downstream of a reverse osmosis membrane device as a water treatment device, predetermined parameters are set for the regulators that adjust the flow rate to both the reverse osmosis membrane device and the water treatment device, and water flow is initiated. Then, the control device 101 adjusts the aperture of the on-off valve, which regulates the flow rate to the reverse osmosis membrane device, according to the flow rate of treated water from the water treatment device. This allows water to be passed at a target flow rate more easily and quickly than by adjusting the flow rates of both the reverse osmosis membrane device and the water treatment device downstream. Furthermore, because the flow rate parameters downstream of the reverse osmosis membrane device are not changed, fluctuations in water quality due to flow rate control can be minimized. In this way, treated water can be easily stabilized. Note that an electrodeionized water production system (EDI system) may be provided as a water treatment device instead of the RO system 11. (Third embodiment)

[0039] FIG. 10 is a diagram showing a third embodiment of a water treatment facility that can be applied to the water treatment system shown in FIG. 1. The water treatment facility of this embodiment is provided in the primary pure water producing system 2 shown in FIG. 1. As shown in FIG. 10, the water treatment facility of this embodiment includes RO devices 10 and 11, which are reverse osmosis membrane devices, pumps 20-1 to 20-3, inverters 21-1 to 21-3, a flow meter 30, on-off valves 40 and 41, an EDI device 60, which is an electrodeionized water producing device, and a control device 102. The RO devices 10 and 11, pumps 20-1 and 20-2, inverters 21-1 and 21-2, flow meter 30, and on-off valves 40 and 41 are the same as those in the first embodiment. The RO device 11 and EDI device 60 are arranged as a water treatment device.

[0040] The pump 20-3 supplies treated water (permeate) from the RO device 11 to the EDI device 60. If a water tank storing treated water (permeate) from the RO device 11 is provided upstream of the pump 20-3, the pump 20-3 pumps up the treated water stored in the water tank and supplies it to the EDI device 60. The pump 20-3 is provided with an inverter 21-3, and the drive frequency (rotation speed) of the pump 20-3 is controlled by the inverter 21-3, thereby controlling the discharge rate (amount supplied to the EDI device 60). The inverter 21-3 controls the drive frequency of the pump 20-3 based on parameters set by the control device 102. The pump 20-3 and the inverter 21-3 constitute a second adjustment unit.

[0041] The EDI device 60 is a typical EDI device (electrodeionized water production device) having a deionization compartment, a concentration compartment, and an electrode compartment, which are separated by a cation exchange membrane and an anion exchange membrane. A direct current is passed through the EDI device 60, and ions contained in the treated water supplied to the EDI device 60 by the pump 20-3 are removed in the deionization compartment, while the ion exchange resin is continuously regenerated. The treated water from which ions have been removed in the EDI device 60 is discharged as deionized water. Meanwhile, a portion of the water to be treated is sent to the concentration compartment of the EDI device 60 and discharged from the EDI device 60 to the outside as concentrated water with concentrated ions.

[0042] Fig. 11 is a diagram showing an example of components included in the control device 102 shown in Fig. 10. As shown in Fig. 11, the control device 102 shown in Fig. 10 has a parameter acquisition unit 112, a parameter setting unit 122, a flow rate value acquisition unit 130, and a change unit 140. The flow rate value acquisition unit 130 and the change unit 140 are the same as those in the first embodiment. Note that Fig. 11 shows only the main components related to this embodiment among the components included in the control device 102 shown in Fig. 10.

[0043] The parameter acquisition unit 112 acquires parameters corresponding to a desired flow rate value (target flow rate value). These parameters are set by the parameter setting unit 122 for each of the inverters 21-1 to 21-3. The parameters acquired by the parameter acquisition unit 112 are numerical values ​​determined in association with the flow rate value based on test runs, experiments, and past statistical data. The parameters acquired by the parameter acquisition unit 112 may be stored in a database accessible by the control device 102, or may be held in a device from which the control device 102 can acquire the parameters. The parameter acquisition unit 112 outputs the acquired parameters to the parameter setting unit 122.

[0044] Parameter setting unit 122 sets the parameters output from parameter acquisition unit 112 to inverters 21-1 to 21-3, respectively. Furthermore, parameter setting unit 122 sets the parameters changed by change unit 140 to inverter 21-1.

[0045] The following describes a method for operating the water treatment facility shown in Fig. 10. Fig. 12 is a flowchart for explaining an example of a method for operating the water treatment facility shown in Fig. 10.

[0046] First, when a target flow rate value is set (step S21), the parameter acquisition unit 112 acquires parameters corresponding to the target flow rate value (step S22). The parameter setting unit 122 sets the parameters acquired by the parameter acquisition unit 112 to each of the inverters 21-1 to 21-3 (step S23). Thereafter, water flow to the RO devices 10 and 11 begins, and the flow rate value acquisition unit 130 acquires the flow rate value measured by the flow meter 30 (step S24). The timing at which the flow rate value acquisition unit 130 acquires the flow rate value measured by the flow meter 30 may be the timing when a predetermined time (e.g., 2 to 3 minutes) has elapsed since water flow to the RO devices 10 and 11 and the EDI device 60 began. Alternatively, the timing at which the flow rate value acquisition unit 130 acquires the flow rate value measured by the flow meter 30 may be the timing when the water quality of the treated water from the EDI device 60 reaches a value that satisfies a preset condition. This condition may be the condition described in the first embodiment. Next, the change unit 140 calculates the difference between the flow rate value acquired by the flow rate value acquisition unit 130 and the reference flow rate value (step S25). The timing at which the change unit 140 calculates the difference may be the same as the timing at which the change unit 140 calculates the difference in the first embodiment. The change unit 140 compares the calculated difference with a threshold value and determines whether the calculated difference exceeds the threshold value (step S26). If the calculated difference exceeds the threshold value, the change unit 140 changes the parameters to be set in the inverter 21-1 (step S27).

[0047] 13 is a flowchart for explaining an example of the detailed processing of step S27 shown in FIG. 12. The change unit 140 determines whether the flow rate value acquired by the flow rate value acquisition unit 130 is smaller than the reference flow rate value (step S721). If the flow rate value acquired by the flow rate value acquisition unit 130 is smaller than the reference flow rate value, the change unit 140 changes the parameter to one that increases the drive frequency of the inverter 21-1 (step S722). On the other hand, if the flow rate value acquired by the flow rate value acquisition unit 130 is not smaller than the reference flow rate value, the change unit 140 changes the parameter to one that decreases the drive frequency of the inverter 21-1 (step S723). The parameter changed by the change unit 140 in step S722 or step S723 is set by the parameter setting unit 122 to the inverter 21-1 (step S724).

[0048] In this embodiment, in a configuration in which a reverse osmosis membrane device and an electrodeionized water production system are provided downstream of a reverse osmosis membrane device as water treatment devices, predetermined parameters are set for the adjustment units that adjust the flow rate to each of the reverse osmosis membrane device and the water treatment device, and water flow is initiated. The control device 102 then changes the drive frequency of the pump, which adjusts the flow rate to the upstream reverse osmosis membrane device, based on the flow rate of treated water from the downstream water treatment device. This allows water to flow at a target flow rate more easily and quickly than adjusting the flow rates of all water treatment devices downstream of the reverse osmosis membrane device. Furthermore, because the flow rate parameters of the downstream reverse osmosis membrane device are not changed, fluctuations in water quality due to flow rate control are minimized. In this way, treated water can be easily stabilized. An ultraviolet oxidation device (Uvox) may be provided instead of the EDI device 60. Furthermore, one or more EDI devices connected in series may be provided downstream of the EDI device 60.

[0049] It is also possible to provide a flow meter in the path through which the concentrated water flows, and perform the above-described treatment based on the flow rate of the concentrated water from the RO devices 10 and 11.

[0050] Although the above description has been given by allocating each function (process) to each component, this allocation is not limited to the above. Furthermore, the configuration of the components is also not limited to the above-described form, which is merely an example.

[0051] The processes performed by each of the control devices 100 to 102 described above may be performed by a logic circuit manufactured for each purpose. Alternatively, a computer program (hereinafter referred to as a program) describing the process procedures may be recorded on a recording medium readable by each of the control devices 100 to 102, and the program recorded on the recording medium may be read and executed by each of the control devices 100 to 102. Examples of recording media readable by each of the control devices 100 to 102 include removable recording media such as floppy disks, magneto-optical disks, DVDs (Digital Versatile Discs), CDs (Compact Discs), Blu-ray (registered trademark) Discs, USB (Universal Serial Bus) memories, and SD cards, as well as memories such as ROMs (Read Only Memory), RAMs (Random Access Memory), and HDDs (Hard Disc Drives) built into each of the control devices 100 to 102. The program recorded on this recording medium is read by a CPU (not shown) provided in each of the control devices 100 to 102, 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 recording medium on which the program is recorded. [Explanation of symbols]

[0052] 1 Pretreatment System 2. Primary pure water production system 3 Subsystems 10,11 RO equipment 20-1~20-3 Pump 21-1~21-3 Inverter 30 Flow meter 40, 41, 50-1, 50-2 Opening and closing valves 51-1, 51-2 Valve adjustment section 60 EDI equipment 100~102 Control device 110~112 Parameter acquisition section 120~122 Parameter setting section 130 Flow rate value acquisition unit 140,141 Changes

Claims

1. A reverse osmosis membrane device; a water treatment device for treating treated water from the reverse osmosis membrane device; a control device; a first adjusting unit that adjusts the supply of the water to be treated to the reverse osmosis membrane device using parameters set by the control device; a second adjusting unit that adjusts the supply of the treated water to the water treatment device using parameters set by the control device, The control device a parameter setting unit that sets predetermined parameters in the first adjustment unit and the second adjustment unit; a flow rate value acquiring unit that acquires a flow rate value indicating a flow rate of treated water from the reverse osmosis membrane device or the water treatment device; a change unit that changes the parameter to be set in the first adjustment unit based on the flow rate value acquired by the flow rate value acquisition unit after the parameter setting unit sets the predetermined parameters in each of the first adjustment unit and the second adjustment unit, The parameter setting unit sets the parameters changed by the change unit in the first adjustment unit.

2. The water treatment facility according to claim 1, The change unit changes the parameters set in the first adjustment unit when a difference between the flow rate value acquired by the flow rate value acquisition unit and a reference flow rate value exceeds a threshold value.

3. The water treatment facility according to claim 2, The water treatment equipment includes a change unit that changes the parameters set in the first adjustment unit to parameters that increase the supply of the treated water when the difference between the flow rate value acquired by the flow rate value acquisition unit and the reference flow rate value exceeds the threshold value and the flow rate value acquired by the flow rate value acquisition unit is lower than the reference flow rate value.

4. The water treatment facility according to any one of claims 1 to 3, The first adjustment unit and the second adjustment unit each include: A pump and and an inverter that controls the drive frequency of the pump based on parameters set by the control device.

5. The water treatment facility according to any one of claims 1 to 3, The first adjustment unit and the second adjustment unit each include: A flow control valve; and a valve adjustment unit that adjusts the opening of the flow rate adjustment valve based on parameters set by the control device.

6. The water treatment facility according to any one of claims 1 to 3, The water treatment facility is a reverse osmosis membrane device or an electrodeionization water production device.

7. The water treatment facility according to any one of claims 1 to 3, the control device has a parameter acquisition unit that acquires the parameter corresponding to a desired flow rate value as the predetermined parameter, The parameter setting unit sets the parameters acquired by the parameter acquisition unit in each of the first adjustment unit and the second adjustment unit.

8. a parameter setting unit that sets predetermined parameters for a first adjusting unit that adjusts the supply of water to be treated to the reverse osmosis membrane device and a second adjusting unit that adjusts the supply of the treated water to a water treatment device that treats the treated water from the reverse osmosis membrane device; a flow rate value acquiring unit that acquires a flow rate value indicating a flow rate of treated water from the reverse osmosis membrane device or the water treatment device; a change unit that changes the parameter to be set in the first adjustment unit based on the flow rate value acquired by the flow rate value acquisition unit after the parameter setting unit sets the predetermined parameters in each of the first adjustment unit and the second adjustment unit, The parameter setting unit sets the parameters changed by the change unit in the first adjustment unit.

9. a process of setting predetermined parameters for a first adjusting unit that adjusts the supply of water to be treated to a reverse osmosis membrane device and a second adjusting unit that adjusts the supply of the treated water to a water treatment device that treats the treated water from the reverse osmosis membrane device; A process of acquiring a flow rate value indicating a flow rate of treated water from the reverse osmosis membrane device or the water treatment device; a process of setting the predetermined parameters for the first adjustment unit and the second adjustment unit, and then changing the parameters to be set for the first adjustment unit based on the acquired flow rate value; and setting the changed parameters in the first adjustment unit.

10. On the computer, a step of setting predetermined parameters in a first adjusting unit that adjusts the supply of water to be treated to a reverse osmosis membrane device and a second adjusting unit that adjusts the supply of the treated water to a water treatment device that treats the treated water from the reverse osmosis membrane device; acquiring a flow rate value indicating a flow rate of treated water from the reverse osmosis membrane device or the water treatment device; a step of setting the predetermined parameters for the first adjustment unit and the second adjustment unit, and then changing the parameters to be set for the first adjustment unit based on the acquired flow rate value; and a procedure for setting the changed parameters in the first adjustment unit of the reverse osmosis membrane device.

Images