Reverse osmosis system and method for constructing a reverse osmosis system

Abstract

To provide a reverse osmosis system which enables a chemical feed system to be added to an existing RO system while avoiding stopping of supply of treatment water as much as possible, and to provide a construction method of the reverse osmosis system.SOLUTION: A reverse osmosis system 1 includes: a power control device 110 which controls driving of a raw water pump P1 which compresses raw water W1 which penetrates through a reverse osmosis membrane 120; and a chemical feed control device 210 which controls injection of a chemical solution W4 into the raw water W1. The power control device 110 and the chemical feed control device 210 are communicably connected through a signal input / output module 111 attached to the power control device 110.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a reverse osmosis system and a method for constructing a reverse osmosis system. [Background technology]

[0002] Conventionally, there has been an RO system (hereinafter sometimes referred to as an RO device) that produces pure water by using a reverse osmosis membrane to obtain treated water from raw water pressurized by a pump (Patent Document 1). In conventional RO systems, the operation of the pump is controlled by a controller housed in a specified control panel. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 4883489 Summary of the Invention [Problem to be solved by the invention]

[0004] However, when adding a chemical injection system to a conventional RO system, which injects chemicals into the raw water, such as anti-scale agents to prevent calcium and other scale buildup, anti-bacterial agents to prevent biofouling, and coagulants to remove turbidity, it takes time to change the existing control panel hardware and software installed in the controller, which can sometimes require the supply of treated water to be stopped for long periods of time.

[0005] An object of the present invention is to provide a reverse osmosis system and a method for constructing a reverse osmosis system that allows a chemical injection system to be added to an existing RO system while minimizing interruptions to the supply of treated water. [Means for solving the problem]

[0006] The present invention has the following aspects. (1) A reverse osmosis system according to one aspect of the present invention includes a power control device that controls the operation of a raw water pump that pressurizes raw water to be permeated through a reverse osmosis membrane, and a chemical injection control device that controls the injection of a chemical solution into the raw water, wherein the power control device and the chemical injection control device are: To enable cooperation between the control of the raw water pump and the control of the injection of the chemical solution into the raw water, The power control device is communicatively connected via a signal input / output module attached to the power control device. (2) In the above (1), the chemical injection control device may be connected to a raw water sensor that measures the physical quantity of the raw water or a chemical solution sensor that measures the chemical solution physical quantity of the chemical solution, and a chemical injection pump that pressurizes the chemical solution. (3) In the above (2), the chemical injection control device may separately include a monitoring panel connected to the raw water sensor or the chemical liquid sensor, and a chemical injection pump control panel connected to the chemical injection pump. (4) In any of the above (1) to (3), the chemical injection control device may transmit power operation data from the power control device or chemical injection operation data from the chemical injection control device to a monitoring server via a network. (5) A method for constructing a reverse osmosis system according to one aspect of the present invention includes the steps of: preparing a chemical injection control device having a chemical injection program pre-installed therein for controlling the injection of a chemical solution into raw water; and attaching a signal input / output module communicably connected to the chemical injection control device to a power control device that controls the drive of a raw water pump that pressurizes the raw water. fruit, The signal input / output module communicatively connects the power control device and the chemical injection control device so that control of the drive of the raw water pump by the power control device and control of the injection of the chemical solution into the raw water by the chemical injection control device can be coordinated. . (6) In the above (5), the method may include the steps of installing a raw water sensor for measuring a raw water physical quantity of the raw water or a chemical solution sensor for measuring a chemical solution physical quantity of the chemical solution in a main pipe through which the raw water flows to the discharge port, and connecting the raw water sensor or the chemical solution sensor to the chemical injection control device so as to be able to communicate with each other. (7) In the above (5) or (6), the chemical injection control device may be connected to a monitoring server via a network so as to be able to transmit data. [Effects of the Invention]

[0007] According to the present invention, it is possible to provide a reverse osmosis system and a method for constructing a reverse osmosis system that can add a chemical injection system to an existing RO system while minimizing interruption to the supply of treated water. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is an explanatory diagram of an existing RO system 100. [Figure 2] 1 is an explanatory diagram of a reverse osmosis system according to an embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0009] [Embodiment] Hereinafter, a reverse osmosis system 1 according to an embodiment will be described along with a method for constructing the reverse osmosis system 1. Fig. 1 is an explanatory diagram of an existing RO system. Fig. 2 is an explanatory diagram of the reverse osmosis system 1 according to an embodiment.

[0010] The reverse osmosis system 1 according to the embodiment can be used to produce pure water, for example. The reverse osmosis system 1 is basically an existing RO system 100 as shown in FIG. 1 to which a chemical injection system 200 as shown in FIG. 2 has been added.

[0011] As shown in Figure 1, an existing RO system 100 includes a reverse osmosis membrane 120 that separates raw water W1 into treated water W2 and concentrated water W3, a raw water pump P1 that pressurizes the raw water W1 stored in a raw water tank T1 and passes it through the reverse osmosis membrane 120, an outlet 130 from which treated water W2 that has passed through the reverse osmosis membrane 120 is discharged, a main pipe M1 that passes the raw water W1 from the raw water tank T1 through the reverse osmosis membrane 120 to the outlet 130, a power control device 110 that controls the operation of the RO system 100, including starting and stopping, by controlling the drive of the raw water pump P1, and an appropriate safety filter 140.

[0012] Power control device 110 may be, for example, a programmable logic controller (hereinafter referred to as PLC) that can be connected via a CC link communication cable C1 to chemical injection control device 210 of chemical injection system 200. Power is supplied to power control device 110 as appropriate.

[0013] The reverse osmosis membrane 120 is provided midway along the main pipe M1. The reverse osmosis membrane 120 separates the raw water W1 into treated water W2 and concentrated water W3.

[0014] The RO system 100 may optionally include a raw water sensor S1 that measures physical quantities of the raw water W1, such as the concentration (water quality), temperature, flow rate, and pressure of the raw water W1. The RO system 100 may also optionally include a treated water sensor S2 that measures physical quantities of the treated water W2, such as the concentration, temperature, flow rate, and pressure of the treated water W2. The raw water sensor S1 or the treated water sensor S2 is connected to the power control device 110 so as to be able to transmit the measured values.

[0015] The RO system 100 is operated based on commands from a power control device 110. Based on the commands from the power control device 110, a raw water pump P1 is driven. The raw water W1 is pressurized by the raw water pump P1 and supplied to a reverse osmosis membrane 120. Treated water W2 of the raw water W1 that has permeated the reverse osmosis membrane 120 is extracted from a discharge port 130. Concentrated water W3 separated from the treated water W2 of the raw water W1 is discharged as appropriate.

[0016] The chemical injection system 200 is added to the existing RO system 100 to form the reverse osmosis system 1. 2, chemical injection system 200 includes chemical injection control device 210 that controls the injection of chemical solution W4 into raw water W1, chemical injection pump P2, and chemical injection tank T2. Chemical injection system 200 also includes chemical solution sensor S3 that measures physical quantities such as the concentration, flow rate, and pressure of chemical solution W4 as appropriate. The chemical injection control device 210 is, for example, a PLC that can be connected via a CC link communication cable C1 to the power control device 110 of the RO system 100. Power is supplied to the chemical injection control device 210 as needed.

[0017] The chemical injection control device 210 is connected to a raw water sensor S1 that measures a physical quantity of raw water W1 or a chemical sensor S3 that measures a chemical physical quantity of the chemical, and a chemical injection pump P2 that pressurizes the chemical W4. This allows the chemical injection control device 210 to be connected to the power control device 110, enabling cooperation between the control of the RO system 100 and the control of the chemical injection system 200. The measurement values ​​of the raw water sensor S1 or the chemical sensor S3 can be used for these controls.

[0018] Chemical injection control device 210 may be provided with a monitoring panel 211 connected to raw water sensor S1 or chemical solution sensor S3, and a chemical injection pump control panel 212 connected to chemical injection pump P2, separately. Note that monitoring panel 211 and chemical injection pump control panel 212 may be physically separated and placed separately while maintaining a state in which they can communicate with each other, or they may be housed in a single case or integrated. The monitoring panel 211, in cooperation with the chemical injection pump control panel 212, has the function of controlling, for example, the start / stop, flow rate, pressure, etc. of the chemical injection pump P2 based on drive information of the chemical injection pump P2 and measured values ​​of physical quantities from the raw water sensor S1 or the chemical liquid sensor S3. The monitoring panel 211 may be connected to the treated water sensor S2. The chemical injection pump control panel 212 cooperates with the monitoring panel 211 and has the function of controlling the driving of the chemical injection pump P2, for example. The monitoring panel 211 and the chemical injection pump control panel 212 are connected to each other so that they can communicate with each other. In this way, chemical injection control device 210 is provided with monitoring panel 211 and chemical injection pump control panel 212 separately, so that the work period for adding monitoring panel 211 and the work period for adding chemical injection pump control panel 212 to existing RO system 100 can be flexibly shifted and each can be constructed separately. Therefore, the degree of freedom in construction for adding chemical injection control device 210 to existing RO system 100 can be increased.

[0019] Here, the power control device 110 and the chemical injection control device 210 are communicatively connected via a signal input / output module 111 attached to the power control device 110. As a result, by the simple task of attaching the signal input / output module 111 to the power control device 110, the power control device 110 and the chemical injection control device 210 can be connected so that the control of the RO system 100 and the control of the chemical injection system 200 can be linked. This reduces the work time required to add the chemical injection system 200 to the existing RO system 100. This allows the chemical injection system 200 to be added to the existing RO system 100 while minimizing interruptions to the supply of treated water W2.

[0020] The reverse osmosis system 1 may include a monitoring server 400 connected via a network N. The monitoring server 400 is connected to the chemical injection control device 210. This allows the chemical injection system 200 to be added to the existing RO system 100, and at the same time, a function for remotely monitoring the operating status of the reverse osmosis system 1 can be added.

[0021] The chemical injection control device 210 transmits power operation data from the power control device 110 or chemical injection operation data from the chemical injection control device 210 to the monitoring server 400 via the network N. This allows the operating status of the reverse osmosis system 1 to be monitored remotely. The power operation data is, for example, data on the output, start / stop, etc. of the raw water pump P1, or data on the water quality, temperature, flow rate, pressure, etc. of the raw water W1. The chemical injection operation data is, for example, data on the output, start / stop, etc. of the chemical injection pump P2, or data on the concentration, temperature, flow rate, pressure, etc. of the chemical solution W4.

[0022] Here, the method for constructing the reverse osmosis system 1 by adding the chemical injection system 200 to the existing RO system 100 is as follows.

[0023] (1) First, as shown in FIG. 2, a chemical injection pipe M2, which carries a chemical solution W4 pressurized by a chemical injection pump P2, is connected to a main pipe M1, which carries raw water W1 to be permeated through a reverse osmosis membrane 120, so that the raw water W1 and the chemical solution W4 merge (chemical injection pipe connection process).

[0024] (2) Also, a chemical injection control device 210 is prepared, into which a chemical injection program for controlling the injection of the chemical solution W4 into the raw water W1 has been previously installed (chemical injection control device preparation step).

[0025] (3) Here, a signal input / output module 111 connected to the chemical injection control device 210 so as to be able to communicate with it is mounted on the power control device 110, which controls the drive of the raw water pump P1 that pressurizes the raw water W1 (signal input / output module mounting step). Here, the power control device 110 is, for example, a PLC. The signal input / output module 111 is mountable on the power control device 110 and has a signal input section and an output section, for example, a CC link card. The signal input / output module 111 is connected to the power control device 110 so as to be able to communicate with it, for example, by a CC link communication cable C1. In this way, chemical injection system 200 can be added to an existing RO system 100 simply by attaching signal input / output module 111, which is communicatively connected to chemical injection control device 210, to power control device 110, and it is possible to link start / stop control in RO system 100 with control of chemical injection in chemical injection system 200. Therefore, the time required to modify hardware, including a control panel accommodating power control device 110 of the existing RO system 100, or to rewrite software installed in power control device 110 of the existing RO system 100 in order to add chemical injection system 200 can be significantly reduced. Therefore, chemical injection system 200 can be added to an existing RO system 100 while minimizing interruption to the supply of treated water W2.

[0026] (4) Furthermore, as shown in Figure 2, a raw water sensor S1 for measuring the raw water physical quantity of the raw water W1 or a chemical sensor S3 for measuring the chemical physical quantity of the chemical W4 is installed in the main pipe M1, which passes the raw water W1 to the discharge port 130, as appropriate (sensor installation step). Note that a treated water sensor S2 for measuring the treated water physical quantity of the treated water W2 may also be installed in the main pipe M1. If the raw water sensor S1 or the treated water sensor S2 is already installed in the existing RO system 100, these existing sensors can be used, and the sensor installation step can be omitted.

[0027] (5) Furthermore, the raw water sensor S1 or the chemical liquid sensor S3 is communicatively connected to the chemical injection control device 210 (sensor connection step). This allows the measurement value from the raw water sensor S1 or the chemical liquid sensor S3 to be transmitted. Therefore, the measurement value from the raw water sensor S1 or the chemical liquid sensor S3 can be used to control the RO system 100, the chemical injection system 200, or the interlocking control between the RO system 100 and the chemical injection system 200. Note that the treated water sensor S2 may also be communicatively connected to the chemical injection control device 210.

[0028] (6) In addition, the chemical injection control device 210 is connected to the monitoring server 400 via the network N as needed so that data can be transmitted (monitoring server connection step). This allows the chemical injection system 200 to be added to the existing RO system 100 through simple hardware and software modifications, and also allows the existing RO system 100 to be converted into a reverse osmosis system 1 whose operating status can be remotely monitored.

[0029] In this way, the chemical injection system 200 can be easily added to an existing RO system 100 without requiring major modifications to the hardware and software. Therefore, a reverse osmosis system 1 can be constructed by adding the chemical injection system 200 to the existing RO system 100, while minimizing interruption to the supply of treated water W2.

[0030] Although the embodiments have been described above with reference to the drawings, the present invention is not limited to the above. Multiple features given as the embodiments may be freely combined.

[0031] The reverse osmosis system 1 according to this embodiment includes a power control device 110 that controls the operation of a raw water pump P1 that pressurizes raw water W1 to be permeated through a reverse osmosis membrane 120, and a chemical injection control device 210 that controls the injection of a chemical solution W4 into the raw water W1. The power control device 110 and the chemical injection control device 210 are communicatively connected via a signal input / output module 111 attached to the power control device 110. This allows the power control device 110 and the chemical injection control device 210 to be connected so that the control of the RO system 100 and the control of the chemical injection system 200 can be coordinated by simply attaching the signal input / output module 111 to the power control device 110. This reduces the time required to add the chemical injection system 200 to an existing RO system 100. This allows the chemical injection system 200 to be added to an existing RO system 100 while minimizing interruptions to the supply of treated water W2.

[0032] The method for constructing a reverse osmosis system 1 according to this embodiment includes the steps of preparing a chemical injection control device 210 pre-installed with a chemical injection program for controlling the injection of the solution chemical W4 into raw water W1, and attaching a signal input / output module 111 communicably connected to the chemical injection control device 210 to a power control device 110 that controls the drive of a raw water pump P1 that pressurizes the raw water W1. This simple process of attaching the signal input / output module 111 to the power control device 110 enables the power control device 110 and the chemical injection control device 210 to be connected so that the control of the RO system 100 and the control of the chemical injection system 200 can be linked. This reduces the time required to add the chemical injection system 200 to an existing RO system 100. This allows the chemical injection system 200 to be added to an existing RO system 100 while minimizing interruptions to the supply of treated water W2. [Explanation of symbols]

[0033] 1. Reverse Osmosis System 100 RO System 110 Power control device 111 Signal Input / Output Module 120 Reverse osmosis membrane 130 Discharge port 140 Safety Filter 200 Chemical Injection System 210 Chemical injection control device 211 Monitoring board 212 Chemical injection pump control panel 400 Monitoring Server M1 main pipe M2 chemical injection pipe N Network P1 raw water pump P2 Chemical dosing pump S1 raw water sensor S2 Treated Water Sensor S3 Chemical Sensor T1 raw water tank T2 Chemical injection tank W1 raw water W2 treated water W3 Concentrated water W4 Chemical Solution

Claims

1. a power control device that controls the drive of a raw water pump that pressurizes raw water to be permeated through a reverse osmosis membrane, and a chemical injection control device that controls the injection of a chemical solution into the raw water; The power control device and the chemical injection control device are communicatively connected via a signal input / output module attached to the power control device so that control of the drive of the raw water pump and control of the injection of the chemical solution into the raw water can be coordinated. Reverse osmosis system.

2. 2. The reverse osmosis system according to claim 1, wherein the chemical injection control device is connected to a raw water sensor that measures a physical quantity of the raw water or a chemical sensor that measures a chemical physical quantity of the chemical, and a chemical injection pump that pressurizes the chemical.

3. 3. The reverse osmosis system according to claim 2, wherein the chemical injection control device comprises a monitoring panel connected to the raw water sensor or the chemical solution sensor, and a chemical injection pump control panel connected to the chemical injection pump.

4. 4. The reverse osmosis system according to claim 1, wherein the chemical injection control device transmits power operation data from the power control device or chemical injection operation data from the chemical injection control device to a monitoring server via a network.

5. preparing a chemical injection control device having a chemical injection program pre-installed therein for controlling the injection of chemicals into raw water; and attaching a signal input / output module communicably connected to the chemical injection control device to a power control device that controls the drive of a raw water pump that pressurizes the raw water, A method for constructing a reverse osmosis system, in which the signal input / output module communicatively connects the power control device and the chemical injection control device so that the control of the drive of the raw water pump by the power control device and the control of the injection of the chemical solution into the raw water by the chemical injection control device can be coordinated.

6. a step of installing a raw water sensor for measuring a raw water physical quantity of the raw water or a chemical solution sensor for measuring a chemical solution physical quantity of the chemical solution in a main pipe through which the raw water flows to a discharge port; and a step of communicatively connecting the raw water sensor or the chemical solution sensor to the chemical injection control device. A method for constructing a reverse osmosis system according to claim 5.

7. 7. The method for constructing a reverse osmosis system according to claim 5, wherein the chemical injection control device is connected to a monitoring server via a network so as to be able to transmit data.

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