Electrodialysis reversal treatment system

Abstract

The present invention provides an electrodialysis reversal (EDR) treatment system, which includes: an electrodialysis reversal device (EDR); a raw water tank, which is connected to the raw water flow path and is equipped with a delivery pump and an input valve; the raw water tank is used to accommodate raw water or concentrate, and is simultaneously delivered to the electrodialysis reversal device through the input valve under equal pressure; an electrode water tank, which is equipped with a delivery pump and is connected to a replenishment pipeline, the replenishment pipeline being provided with a control valve. When the control valve is opened, the raw water tank can replenish raw water to the electrode water tank; the raw water output pipeline and the concentrate output pipeline are each equipped with an adjustment valve to control the input and output flow rates of the electrodialysis reversal device. Thus, it allows for the control and improvement of the EDR process and simplifies the equipment, significantly reducing the number and use of valves, thereby lowering the overall equipment installation cost and volume. Moreover, it ensures that raw water and concentrate can be input into the EDR under equal pressure, thoroughly addressing issues of membrane deformation or leakage caused by pressure differences within the EDR, improving the operational stability of the EDR and extending its service life. In addition, it allows for backwashing of the EDR to prevent scaling, thus reducing time costs and minimizing wastewater generation during the reversal operation. Furthermore, it can perform freshwater backflow to reduce conductivity and provide automatic control of voltage and current, which lowers the number of EDR units required, significantly reducing water treatment costs, while improving the stability and accuracy of the water quality output.

Description

[Technical Field]

[0001] The present invention provides a reverse polarity electrodialysis treatment system, particularly a system that can improve the control and simplify the equipment of the reverse polarity electrodialysis reversal (EDR) device, so as to significantly reduce the configuration and use of valves, thereby reducing the overall equipment construction cost and volume, and improving the stability of EDR operation and the quality of water output. [Previous Technology]

[0002] Note that electrodialysis (ED) technology uses multiple alternating layers of anion and cation membranes. It uses positive and negative direct current as the driving force for the movement of ions in water, causing cations and anions in the water to move towards the cathode and anode, respectively. Electrodialysis reversal (EDR) equipment further improves electrodialysis technology by periodically changing the electrode polarity. That is, by switching the positive and negative electrodes of direct current and the internal current conduction, it extends the service life of anion and cation membranes and reduces the formation of scale on EDR equipment. It is suitable for water resource recycling and reuse.

[0003] In the existing EDR system control, after a period of use, scale may be generated in the membrane stack. In addition, due to the pressure difference between the water channels in the EDR, water may leak between the EDR membrane stacks. If the pressure difference is too large, it may even damage the membrane stack, resulting in additional costs. In addition, in order to maintain the stable operation of the EDR system for a long time, more peripheral equipment is often required and regular maintenance is required. Otherwise, the EDR system will not be able to maintain good functionality, resulting in the output water quality not being able to maintain stability.

[0004] In existing EDR systems, as shown in Figure 1, the sources entering the EDR system are usually raw water (the water source to be treated), electrode water, and concentrate, which are stored in the raw water tank, electrode water tank, and concentrate tank, respectively. The raw water tank can be transported to the concentrate tank through pump 20. Then, the three water sources are transported to the EDR by their respective pumps. Since they are transported by their respective pumps 21, 22, and 23, even if they are pressure-set separately, the pressure generated when they are transported to the EDR will still be different due to the individual components, pipelines, and water quality. This will cause a pressure difference in the pressure input to the EDR. If the pressure difference between the raw water and concentrate is too large, it may cause the membrane stack in the EDR equipment to become skewed and deformed, resulting in EDR leakage or mutual leakage between the raw water and concentrate. Therefore, controlling the pressure of the inlet water source is extremely important for the configuration of the EDR.

[0005] To address this issue, existing EDR systems typically install pressure gauges 15, 16, and 17 at the three inlet ports of the EDR (raw water, electrode water, and concentrate water) to monitor the pressure values ​​of each water source. Flow meters 12, 13, and 14 are also installed to control the flow rate of each water source, thereby adjusting the water pressure within the EDR to prevent excessive pressure differences.

[0006] Regarding the existing positive and reverse polarity configurations of the EDR, electric valves 1 and 4, and reverse polarity input valves 2 and 3 are respectively installed at the EDR raw water and concentrate inlet ends; while electric valves 5 and 8, and reverse polarity output valves 6 and 7 are respectively installed at the EDR raw water and concentrate outlet ends. Thus, during positive polarity operation, a direct current is applied to the EDR, which opens the electric valves 1, 4, 5, and 8 respectively, and closes the reverse polarity input valves 2 and 3 and the reverse polarity output valve 6. 7. The effluent from the EDR returns to the EDR tank, or is discharged through a control valve and flow meter. The effluent from the concentrate also returns to the concentrate tank. The raw water is called fresh water after passing through the EDR. The fresh water has three flow directions: discharge, raw water tank, and fresh water tank. Each of these is equipped with an electric valve 9, 10, and 11. At this time, the electric valve 9, 10, or 11 will be opened and the other two will be closed according to the conductivity value detected by the conductivity meter 18 installed at the fresh water outlet.

[0007] When the EDR switches to reverse polarity operation, it will open the reverse polarity input valves 2 and 3 and the reverse polarity output valves 6 and 7, and close the electric valves 1, 4, 5 and 8. It will also switch the rectifier of the EDR to complete the reverse polarity switching. The direction of fresh water flow after the reverse polarity will also be determined by the value detected by the conductivity meter 18 to determine the opening and closing of the electric valves 9, 10 and 11.

[0008] However, the existing EDR configuration mentioned above, even with the configuration of pressure gauges 15, 16, 17 and flow meters 12, 13, 14, still cannot effectively and for a long time ensure the respective inlet water pressure. Therefore, continuous monitoring by personnel is required, but this is still not an effective solution, and there is still concern that the membrane stack may deform or leak due to pressure difference.

[0009] Furthermore, existing EDRs do not have a backwashing mechanism. Although the design of EDRs is mainly to improve the efficiency of traditional electrodialysis (ED) after long-term operation due to scaling, the reverse polarity of EDRs can slow down the scaling time. However, it cannot completely prevent scaling. In addition, the disadvantage of existing EDRs is that some wastewater will inevitably be generated every time the polarity is reversed. This is because the raw water and concentrate channels must be switched during the polarity reversal. When switching, the channel that originally produced fresh water will become the channel that produces concentrate, and the concentrate channel will become the fresh water channel. At this time, the fresh water and concentrate will mix. Therefore, the concentration of the original fresh water channel will gradually increase and the concentration of the original concentrate channel will gradually decrease, resulting in no fresh water production for a period of time. Fresh water will only be produced again after the EDR system resumes operation. Therefore, every time the positive and negative polarity reversal is performed, some wastewater will be generated and fresh water cannot be produced for a period of time, resulting in the consumption of time and water resources.

[0010] In addition, in an EDR system, the conductivity of the influent source affects the size of the system equipment. The higher the conductivity of the influent source, the more EDRs are required. The lower the conductivity of the influent source, the fewer EDRs are required. Therefore, the conductivity of the influent source is highly correlated with the number of EDRs required. Moreover, the cost of EDR equipment is extremely high. Existing EDR systems do not have an adjustment mechanism for the conductivity of the influent source. Therefore, they can only be configured with a corresponding number of EDRs based on the conductivity of the water being treated, resulting in high costs and high barriers to entry for implementing EDR systems.

[0011] In view of this, we, the inventors, have devoted ourselves to further researching the simplification of EDR system configuration while ensuring its stability and efficiency. We have also undertaken research and development and improvement in order to solve the above problems with a better invention. After continuous experimentation and modification, this invention was born. [Summary of the Invention]

[0012] Therefore, the purpose of this invention is to solve the aforementioned problems. To achieve the above objective, the inventors provide an inverted-polarity electrodialysis treatment system, comprising: an inverted-polarity electrodialysis device (40). The reversal (EDR) has an input terminal (41) and an output terminal (42); the input terminal (41) is connected to a raw water flow path (51), an electrode water flow path (52) and a concentrate flow path (53); and the output terminal (42) is provided with a raw water output pipeline (61), an electrode water output pipeline (62) and a concentrate output pipeline (63); a raw water tank (71) is connected to the raw water flow path (51), and a transfer pump (34) and an input valve (1) are arranged in sequence; the raw water tank (71) is used to contain raw water or concentrate, so that it can be output at the same pressure through the transfer pump (34) respectively, so that it can be delivered at the same pressure through the raw water flow path (51) and the concentrate flow path (53) to the reversal type. The electrodialysis device (40) includes an electrode water tank (72) connected to the electrode water flow path (52), and a delivery pump (35) is installed in the electrode water flow path (52). A supplementary pipeline is connected between the delivery pump (34) of the electrode water flow path (52) and the input valve (1) of the raw water flow path (51). The supplementary pipeline is equipped with a control valve (3), which allows the raw water tank (71) to supplement the electrode water tank (72) with raw water when the control valve (3) is opened, so as to be used as electrode water. The raw water output pipeline (61) and the concentrate output pipeline (63) are respectively equipped with an adjustment valve (10, 14) to control the input and output flow rates of the inverted electrode electrodialysis device (40).

[0013] According to the above-described inverted electrodialysis treatment system, the raw water flow path (51) is further connected to a backwash flow path between the delivery pump (34) and the input valve (1). The backwash flow path is equipped with two backwash control valves (4, 5) to branch and be respectively connected to the raw water output pipeline (61) and the concentrate output pipeline (63). In a backwash process, the raw water is transported from the raw water output pipeline (61) and the concentrate output pipeline (63) to the inverted electrodialysis device (40) by opening the backwash control valves (4, 5), and discharged through the concentrate flow path (53).

[0014] In the above-described reverse polarity electrodialysis treatment system, the concentrate pipeline is further provided with a discharge valve (2), which is opened during the backwashing process to discharge the backwash.

[0015] According to the above-described inverted-polarity electrodialysis treatment system, at the end of the raw water output pipeline (61), a discharge pipeline (81), a raw water return pipeline (82), and a fresh water pipeline (83) are respectively provided. The fresh water pipeline (83) is connected to a fresh water tank (73), which is used to store the fresh water desalinated by the inverted-polarity electrodialysis equipment (40). At one end of the freshwater pipeline (83), an output pump (36) is provided, and the output pump (36) is connected to a use pipeline (84) and a return pipeline (85); the return pipeline (85) is provided with a return valve (18), which is used to perform a return procedure when the conductivity of the raw water in the raw water tank (71) is high, and the return valve (18) is opened accordingly to return the fresh water to the raw water tank (71).

[0016] According to the above-described inverted electrodialysis treatment system, the return pipeline (85) is further provided with a return flow meter (30), and during the return process, the regulating valve (10) is used to control the flow rate of fresh water returned to the raw water tank (71).

[0017] According to the above-mentioned inverted electrodialysis treatment system, the raw water tank (71), the electrode water tank (72) and the fresh water tank (73) are each equipped with a conductivity meter (31, 32, 33) to detect the conductivity of the raw water, electrode water and fresh water respectively.

[0018] According to the above-described inverted electrodialysis treatment system, the discharge pipeline (81), the raw water return pipeline (82) and the fresh water pipeline (83) are respectively provided with a valve body (15, 16, 17), and the raw water output pipeline (61) is provided with a fresh water conductivity meter (23), a fresh water pressure meter (24) and a fresh water flow meter (25), and the opening and closing system of the valve body (15, 16, 17) can be controlled according to the reading of the fresh water conductivity meter (23).

[0019] According to the above-described inverted electrodialysis treatment system, the concentrate output pipeline (63) is further provided with a concentrate conductivity meter (26), a concentrate pressure meter (27) and a concentrate flow meter (28); and the inverted electrodialysis device (40) is provided with a rectifier, and the conductivity meter (31), the freshwater conductivity meter (23), the concentrate conductivity meter (26) and the rectifier are respectively coupled to a control system (402), and the control system defines a conductivity range, and when the conductivity of the conductivity meter (31), the freshwater conductivity meter (23) and the concentrate conductivity meter (26) exceeds the conductivity range, the rectifier will be controlled accordingly to adjust the voltage or current of the inverted electrodialysis device (40). According to the above-described inverted electrodialysis treatment system, the raw water output pipeline (61) and the concentrated water output pipeline (63) are each equipped with an output valve (6, 9). The raw water output pipeline (61) and the concentrated water output pipeline (63) are each equipped with an inverted pipeline (86, 87) before their respective output valves (6, 9). The inverted pipelines (86, 87) are each equipped with an inverted control valve (7, 8), which are respectively connected to the concentrated water output pipeline. The output valves (6, 9) are installed at the downstream end of the pipeline (63) and the raw water output pipeline (61); when the reverse polarity electrodialysis device (40) is in positive polarity operation mode, the input valve (1) and the output valve (6, 9) are opened and the reverse polarity control valve (7, 8) is closed; and when the reverse polarity electrodialysis device (40) is in reverse polarity operation mode, the input valve (1) and the reverse polarity control valve (7, 8) are opened and the output valve (6, 9) is closed.

[0020] According to the above-described inverted electrodialysis treatment system, the end of the electrode water output pipeline (62) is further connected to a raw water return pipeline (91), an electrode water return pipeline (92) and an electrode water discharge pipeline (93); the raw water return pipeline (91) is connected to the raw water tank (71), and the electrode water return pipeline (92) is connected to the electrode water tank (72); and the raw water return pipeline (91), the electrode water return pipeline (92) and the electrode water discharge pipeline (93) are each equipped with a switch valve (11, 12, 13).

[0021] As described above and configured, it is evident that the present invention has the following main advantages and effects, which are detailed below:

[0022] 1. The present invention uses a delivery pump (34) and an input valve (1) in the raw water tank to allow the concentrate and raw water to be output at the same pressure through the same delivery pump (34), and then delivered at the same pressure through the raw water flow path and the concentrate flow path to the inverted polarity electrodialysis device. Therefore, when the raw water and concentrate are delivered to the EDR, their internal pressure will be uniform and no pressure difference will be generated. At the same time, pressure gauges and flow meters can be installed in the raw water output pipeline and the concentrate output pipeline respectively to monitor the pressure and flow. The present invention can use the adjustment valves (10, 14), which can be proportional control valves, to control the input and output flow of the EDR, instead of controlling the flow and pressure when the water enters, as is the case in the conventional method. This can effectively improve the problem of membrane stack deformation or leakage caused by pressure difference in the EDR, thereby improving the stability and service life of water treatment.

[0023] 2. Through the configuration of the backwash flow path and the backwash control valve, the present invention enables a backwashing process. By opening the backwash control valve, raw water is transported from the raw water output pipeline and the concentrated water output pipeline to the inverted electrodialysis device and discharged through the concentrated water flow path. With this configuration, compared with the time consumption and additional wastewater generation during inverted polarity, backwashing can reduce the time consumption and additional wastewater generation, and can effectively prevent scaling and even remove scale, so that the present invention can operate for a longer period of time before performing the inverted polarity operation process, thereby effectively improving the efficiency of water treatment.

[0024] 3. By setting up a return pipeline and a return valve, the present invention can perform a return process when the conductivity of the raw water in the raw water tank is high, so as to return fresh water to the raw water tank, mix the fresh water with the raw water, and reduce its conductivity. Therefore, the number of EDR devices can be reduced, thereby effectively reducing the overall equipment construction cost. Or, if the conductivity of the raw water increases due to a sudden accident, the fresh water can be returned and mixed with the raw water to maintain the raw water within a certain conductivity range.

[0025] 4. The present invention uses a conductivity meter and a rectifier to detect the conductivity of raw water, treated water and fresh water respectively. By defining the conductivity range, when the conductivity of the raw water, treated water and fresh water exceeds the conductivity range, the corresponding rectifier will be automatically controlled to adjust the EDR voltage or current accordingly, thereby adjusting its electric field strength. This allows for the control of the EDR effluent water quality based on conductivity, meeting the needs of water treatment and subsequent use, and improving the accuracy of the output water quality.

Implementation Method

[0026] Regarding the technical means of us inventors, several preferred embodiments are described in detail below with reference to the accompanying drawings, so that you may understand and agree with the present invention.

[0027] Please refer to Figure 2 first. This invention is an inverted-polarity electrodialysis treatment system, which includes:

[0028] An electrodialysis reversal (EDR) device 40 has an input terminal 41 and an output terminal 42; the input terminal 41 is connected to a raw water flow path 51, an electrode water flow path 52 and a concentrate flow path 53; and the output terminal 42 is provided with a raw water output pipeline 61, an electrode water output pipeline 62 and a concentrate output pipeline 63;

[0029] A raw water tank 71 is connected to the raw water flow path 51, and a transfer pump 34 and an input valve 1 are sequentially installed therein; the raw water flow path 51 can be equipped with a raw water flow meter 19 and a raw water pressure gauge 20 to monitor its flow rate and pressure; the raw water tank 71 is used to hold raw water (low-salinity water source to be treated) or concentrated water (high-salinity water source). It is understood that the main input of the reverse polarity electrodialysis device 40 is raw water, while the concentrated water is mainly used as the input discharge. If concentrated water is input, it can be concentrated and further recycled; in addition, In this invention, the water source contained in the raw water tank 71 is simultaneously output at equal pressure through the delivery pump 34, so that it is delivered at equal pressure to the inverted polarity electrodialysis device 40 through the raw water flow path 51 and the concentrate flow path 53. The main purpose and function of this configuration is to ensure that no pressure difference is generated when the raw water flow path 51 and the concentrate flow path 53 are input into the inverted polarity electrodialysis device 40, so that they can be completely equal in pressure. Therefore, it can effectively prevent the membrane stack installed inside the inverted polarity electrodialysis device 40 from tilting or leaking due to uneven pressure, thereby improving the stability and service life of the internal components of the inverted polarity electrodialysis device 40.

[0030] In addition, the present invention mainly achieves the effect of pressure difference balance by setting up the raw water tank 71 and performing equal pressure diversion through the transfer pump 34, so that the water flowing into the concentrate flow path 53 is used as concentrate input. At the same time, it eliminates the need for the concentrate tank and its related pumps or the configuration of pressure and flow sensors required for the pumps, thereby reducing the space and cost of additional concentrate tanks and pipelines.

[0031] Regarding the configuration of the concentrate flow path 53, a discharge valve 2 can be configured at one end relative to the reverse polarity electrodialysis device 40, so as to discharge backwash wastewater during the backwashing process. Its related uses and configuration are detailed below.

[0032] An electrode water tank 72 is connected to the electrode water flow path 52. The electrode water is typically used to clean the electrode surface of the EDR and maintain the stability of the electrochemical reaction. In one embodiment, the electrode water can be raw water or treated water. Its main function is to protect the electrode from scaling or damage caused by gas evolution reactions (such as the generation of hydrogen and oxygen), and to provide a flow path for ions to complete the electrochemical reaction. It is known that the electrode water does not directly participate in the separation process of fresh water and concentrated water, but is used to maintain the stability of the electrochemical reaction. For the transportation of the electrode water, a [missing information - likely a device or material] is provided in the electrode water flow path 52. The delivery pump 35, and because the electrode water needs to be replaced or treated regularly, as it may accumulate impurities or precipitated gases, is used to replace and replenish the electrode water. A replenishment pipeline is connected between the delivery pump 34 and the input valve 1 of the electrode water flow path 52 and the raw water flow path 51. The replenishment pipeline is equipped with a control valve 3. In one embodiment, the control valve 3 can be a diaphragm valve (DV). When the control valve 3 is opened, the raw water tank 71 can replenish the electrode water tank 72 with raw water for use as electrode water. The electrode water flow path 52 can also be equipped with an electrode water flow meter 21 and an electrode water pressure gauge 22 to check the flow rate and pressure.

[0033] The flow rate control of this invention is mainly achieved through the output terminal 42 of the inverted polarity electrodialysis device 40. An adjusting valve 10 and a adjusting valve 14 are respectively provided through the raw water output pipeline 61 and the concentrated water output pipeline 63 to control the input and output flow rates of the inverted polarity electrodialysis device 40. In one embodiment, the adjusting valves 10 and 14 can be configured as proportional control valves (EVA), but this is only an example and is not intended to be limiting.

[0034] Continuing with the pipeline configuration of the output terminal 42 of the reverse polarity electrodialysis device 40, it is further provided with a discharge pipeline 81, a raw water return pipeline 82 and a fresh water pipeline 83, and the fresh water pipeline 83 is connected to a fresh water tank 73, which is used to store the fresh water after desalination by the reverse polarity electrodialysis device 40;

[0035] The present invention can control the raw water quality in the raw water tank 71. This is mainly achieved by providing an output pump 36 at one end of the fresh water tank 73 relative to the fresh water pipeline 83. The output pump 36 is connected to a use pipeline 84 and a return pipeline 85. The return pipeline 85 is equipped with a return valve 18, which, when the conductivity of the raw water in the raw water tank 71 is high, initiates a return process by opening the return valve 18 to return fresh water to the raw water tank 71, thereby reducing the conductivity in the raw water tank 71 to meet EDR requirements. Regarding the conductivity requirements and settings, since raw water with high conductivity requires a larger EDR and a greater number of units, it may reduce the stability of the EDR. Therefore, this invention reduces the number of EDR devices by configuring the return pipe 85 and the return valve 18, thereby effectively reducing the overall equipment construction cost and improving the stability of the EDR. As for monitoring the return flow rate, a return flow meter 30 can be installed in the return pipe 85, and during the return process, the regulating valve 10 can control the flow rate of fresh water returned to the raw water tank 71.

[0036] Continuing with the stability control of the fresh water output by EDR, in one embodiment, as shown in Figure 3, the present invention provides a conductivity meter 31, 32, and 33 in the raw water tank 71, the polar water tank 72, and the fresh water tank 73, respectively, to detect the conductivity of the raw water, the polar water, and the fresh water.

[0037] In addition, regarding the control of freshwater output, the discharge pipeline 81, the raw water return pipeline 82, and the freshwater pipeline 83 are respectively equipped with a valve body 15, 16, and 17. The raw water output pipeline 61 is equipped with a freshwater conductivity meter 23, a freshwater pressure meter 24, and a freshwater flow meter 25. The opening and closing of the valve bodies 15, 16, and 17 can be controlled according to the reading of the freshwater conductivity meter 23. When one valve body 15, 16, or 17 is opened, the other two will be closed, so that the freshwater can be reliably determined according to the readings of the freshwater conductivity meter 23, the freshwater pressure meter 24, and the freshwater flow meter 25 to determine whether the freshwater system needs to be discharged, returned to the raw water tank 71, or stored in the freshwater tank 73. The control system can be automatically or manually controlled according to the EDR process or usage requirements.

[0038] For monitoring the output of concentrated water, a concentrated water conductivity meter 26, a concentrated water pressure meter 27 and a concentrated water flow meter 28 can be installed in the concentrated water output pipeline 63.

[0039] The inverted-polarity electrodialysis device 40 is equipped with a rectifier 401. The conductivity meter 31, the freshwater conductivity meter 23, the concentrate conductivity meter 26, and the rectifier 401 are respectively coupled to a control system 402. The control system 402 defines a conductivity range, and when the conductivity of the conductivity meter 31, the freshwater conductivity meter 23, and the concentrate conductivity meter 26 exceeds the conductivity range, it will correspondingly control the rectifier 401 to adjust accordingly. The voltage or current of the inverted-polarity electrodialysis device 40 is set such that, after EDR treatment, the conductivity of the fresh water will be lower than that of the raw water, within a certain range; conversely, the conductivity of the concentrate will be higher than that of the raw water, also within a certain range. However, when the conductivity of the raw water exceeds or falls below the range set by EDR, the conductivity of the fresh water will not be maintained within the required range. Therefore, this invention uses a conductivity meter 31, a fresh water conductivity meter 23, and a concentrate conductivity meter 26 to... Conductivity detection is achieved through analysis by the control system 402, which then controls the rectifier 401 to adjust the voltage or current of the EDR. Since voltage and current are relative, adjusting one will simultaneously increase or decrease the other. Therefore, when the conductivity of the raw water is too high, the control system 402 will cause the rectifier 401 to increase the voltage or current, thereby increasing the current in the EDR and effectively reducing the conductivity of the fresh water to the required range. Conversely, if the conductivity of the raw water is too low, the control system 402 will cause the rectifier 401 to decrease the voltage or current, thereby increasing the conductivity of the fresh water and maintaining it within the required range. Thus, this invention, through its design, can reliably and effectively control the conductivity of fresh water within the required range, preventing instability caused by excessive fluctuations in the conductivity of the raw water. This allows for precise control of the conductivity of fresh water, facilitating subsequent applications.

[0040] Regarding the output of raw water and concentrate, and the reversal configuration, the present invention provides an output valve 6 and a 9 respectively for the raw water output pipeline 61 and the concentrate output pipeline 63. A reversal pipeline 86 and a 87 are respectively provided before the output valves 6 and 9 for the raw water output pipeline 61 and the concentrate output pipeline 63. The reversal pipelines 86 and 87 are respectively provided with reversal control valves 7 and 8, which are respectively connected to the downstream ends of the output valves 6 and 9 in the concentrate output pipeline 63 and the raw water output pipeline 61. When the reversal electrodialysis device 40 is in positive polarity operation mode, the input valve 1 and the output valves 6 and 9 are opened, and the reversal control valves 7 and 8 are closed. When the reversal electrodialysis device 40 is in reversal polarity operation mode, the input valve 1 and the reversal control valves 7 and 8 are opened, and the output valves 6 and 9 are closed.

[0041] The flow direction control of the polar water can be achieved by connecting a raw water return pipe 91, a polar water return pipe 92, and a polar water discharge pipe 93 to the end of the polar water output pipe 62. The raw water return pipe 91 is connected to the raw water tank 71, and the polar water return pipe 92 is connected to the polar water tank 72. The raw water return pipe 91, the polar water return pipe 92, and the polar water discharge pipe 93 are each equipped with a switch valve 11, 12, and 13 to control the polar water to return to the raw water tank 71, return to the polar water tank 72, or be discharged accordingly. The valves can be controlled according to the needs, and when one switch valve 11, 12, or 13 is opened, the other two valves can be closed to ensure proper return or discharge.

[0042] Accordingly, the control processes of the present invention are described below:

[0043] When the present invention operates in the positive electrode mode, as shown in Figure 4 and as mentioned above, the input valve 1 and output valves 6 and 9 are opened, and the discharge valve 2 and the reverse electrode control valves 7 and 8 are closed. At this time, through the delivery pumps 34 and 35 of the raw water flow path 51 and the electrode water flow path 52, the water source in the raw water tank 71 can be delivered at equal pressure through the delivery pump 34 and delivered at equal pressure through the raw water flow path 51 and the concentrate flow path 53 to the reverse electrode electrodialysis device 40. The required electrode water can be input from the electrode water tank 72 through the electrode water flow path 52 by the delivery pump 35 to the EDR, so that the EDR can perform desalination treatment. The flow rates of raw water, electrode water and desalinated water can be controlled and finely adjusted by the regulating valve 10, and the desalinated water produced by the EDR will be desalinated through the desalinated water conductivity. After measurement by meter 23, freshwater pressure gauge 24, and freshwater flow meter 25, if the freshwater has not yet reached the required conductivity, it can be selectively discharged through valve 15 via discharge pipe 81, or it can be returned to raw water tank 71 via raw water return pipe 82 via valve 16 for further EDR treatment. In this embodiment, it is assumed that when the freshwater meets the required conductivity, valve 17 can be opened to allow the freshwater to flow into freshwater tank 73 for subsequent use. Furthermore, an output flow meter 29 can be installed at the rear end of valve 17 in freshwater pipe 83 to determine the flow rate input to freshwater tank 73. As mentioned above, when freshwater is needed, output pump 36 can be opened to output freshwater from use pipe 84 for subsequent process use.

[0044] Regarding the output of the wastewater, under normal circumstances, it can be returned for reuse by opening the switch valve 12. When it needs to be treated, the switch valve 11 can be opened to return it to the original water tank 71. When it needs to be treated or discharged, the switch valve 13 can be opened to discharge it accordingly.

[0045] The output and flow rate of the concentrate are controlled by opening and controlling the regulating valve 14, thereby controlling the input and output flow rates of the reverse polarity electrodialysis device 40. The concentrate can be monitored by the concentrate conductivity meter 26, the concentrate pressure meter 27 and the concentrate flow meter 28. In this embodiment, the concentrate can be discharged by opening the regulating valve 14, but this is only an example and is not intended to limit the process.

[0046] In the reverse polarity operation mode, as shown in Figure 5, the input valve 1 and the reverse polarity control valves 7 and 8 will be opened as described above, and the output valves 6 and 9 will be closed. The opening and closing of various valves are the same as described above. Since the output of concentrated water and fresh water will be reversed after the polarity is reversed, by closing the output valves 6 and 9 and opening the reverse polarity control valves 7 and 8, the fresh water can flow through the reverse polarity control valve 8 and the reverse polarity pipeline 86 to the end of the raw water output pipeline 61, while the concentrated water flows through the reverse polarity control valve 7 and the reverse polarity pipeline 87 to the end of the concentrated water output pipeline 63. As described above, the fresh water and concentrated water can be discharged separately. The discharge control of the polarity water is the same as described above, so it will not be repeated here.

[0047] When the polar water needs to be replenished, as shown in Figure 6, a polar water replenishment process can be carried out by closing the input valve 1 and opening the control valve 3, so that the water source in the original water tank 71 can be transported to the EDR through the transfer pump 34 and the polar water flow path 52, and by opening the switch valve 12, the water can be replenished and returned to the polar water tank 72 through the polar water return pipe 92 for use as polar water.

[0048] Another feature of the present invention is that it can backwash the EDR, effectively preventing scale buildup in the EDR and even removing scale. Preferably, a backwashing flow path 94 is further connected between the raw water flow path 51 and the delivery pump 34 and the input valve 1. This backwashing flow path 94 is equipped with two backwashing control valves 4 and 5, which branch off and are respectively connected to the raw water output pipeline 61 and the concentrate output pipeline 63. A backwash discharge pipeline 95 is provided between the downstream end of the raw water flow path 51 and the concentrate flow path 53. During a backwashing process, as shown in Figure 7, the raw water can be transported from the raw water output pipeline 61 and the concentrate output pipeline 63 to the inverted-polarity electrodialysis device 40 by opening the backwashing control valves 4 and 5 and the discharge valve 2, and closing the input valve 1, control valve 3, output valve 6 and 9, and the polarity reversal control valves 7 and 8. The wastewater is discharged through the raw water flow path 51 and the concentrated water flow path 53. The wastewater discharged through the raw water flow path 51 is collected in the concentrated water flow path 53 via the backwash discharge pipe 95, and is discharged through the discharge valve 2 of the concentrated water flow path 53 for backwashing. In this way, the present invention can wash away the deposits deposited on the inner membrane of the EDR and discharge them, thereby reducing the probability of scaling, reducing the frequency of chemical cleaning, significantly reducing its maintenance costs, and effectively improving its processing capacity.

[0049] Regarding the configuration of all valves in this invention, in one embodiment, except for the control valve 3 and the regulating valves 10 and 14, all of them can be configured as solenoid valves (EV), which can be independently controlled by electronic control. In another embodiment, all valves and all pumps of this invention can be uniformly connected to the control system 402 for centralized monitoring, so that the whole invention can be automatically and systematically controlled, thereby improving the control and management efficiency of the overall EDR process.

[0050] In summary, the technical means disclosed in this invention can effectively solve the problems of the prior art and achieve the expected purpose and effect. Moreover, it has not been published or publicly used before the application and has long-term progressiveness. It is indeed an invention as defined by the Patent Law. Therefore, the application is filed in accordance with the law. I earnestly request Your Excellency to give a detailed review and grant the invention patent. I am deeply grateful for Your Excellency's kindness.

[0051] However, the above description is only a few preferred embodiments of the present invention and should not be construed as limiting the scope of the present invention. All equivalent changes and modifications made in accordance with the scope of the patent application and the contents of the specification of the present invention should still fall within the scope of the patent of the present invention. [Simplified Explanation of the Diagram]

[0052] Figure 1 is a system architecture diagram of a conventional EDR. Figure 2 is a structural configuration diagram of the present invention. Figure 3 is a circuit system architecture diagram of the inverted electrode electrodialysis device and control system of the present invention. Figure 4 is a flow diagram of the present invention based on Figure 2, with thick lines indicating the positive electrode operation mode. Figure 5 is a flow diagram of the present invention based on Figure 2, with thick lines indicating the inverted electrode operation mode. Figure 6 is a flow diagram of the present invention based on Figure 2, with thick lines indicating the electrode water replenishment process. Figure 7 is a flow diagram of the present invention based on Figure 2, with thick lines indicating the backwashing process.

Claims

1. A reverse polarity electrodialysis treatment system, comprising: a reverse polarity electrodialysis device (40) (Electrodialysis Reversal, EDR), having an input terminal (41) and an output terminal (42); the input terminal (41) is connected to a raw water flow path (51), an electrode water flow path (52) and a concentrate flow path (53); and the output terminal (42) is provided with a raw water output pipeline (61), an electrode water output pipeline (62) and a concentrate output pipeline (63); A raw water tank (71) is connected to the raw water flow path (51), and a transfer pump (34) and an inlet valve (1) are sequentially installed thereon; the raw water tank (71) is used to hold raw water or concentrated water, so that it can be simultaneously output at equal pressure through the transfer pump (34), so that it can be delivered at equal pressure through the raw water flow path (51) and the concentrated water flow path (53) to the inverted polarity electrodialysis device (40); and an polarity tank (72) is connected to the An electrode water flow path (52) is provided, and a delivery pump (35) is provided in the electrode water flow path (52). A supplementary pipeline is connected between the delivery pump (34) of the electrode water flow path (52) and the input valve (1) of the raw water flow path (51). A control valve (3) is provided in the supplementary pipeline. When the control valve (3) is opened, the raw water tank (71) can supplement the raw water into the electrode water tank (72) for use as electrode water. An adjustment valve (10, 14) is provided in the raw water output pipeline (61) and the concentrated water output pipeline (63) respectively to control the input and output flow of the reverse electrode electrodialysis device (40).

2. The inverted-polarity electrodialysis treatment system as described in claim 1, wherein, The raw water flow path (51) is further connected to a backwash flow path between the delivery pump (34) and the input valve (1). The backwash flow path is equipped with two backwash control valves (4, 5) to branch and be connected to the raw water output pipeline (61) and the concentrate output pipeline (63) respectively. In a backwash process, the raw water is transported from the raw water output pipeline (61) and the concentrate output pipeline (63) to the inverted polarity electrodialysis device (40) by opening the backwash control valves (4, 5), and discharged through the concentrate flow path (53).

3. The inverted-polarity electrodialysis treatment system as described in claim 2, wherein, The concentrate pipeline is further equipped with a discharge valve (2), which is opened during the backwashing process to discharge the backwash water.

4. The reverse polarity electrodialysis treatment system as described in claim 1, wherein, At the end of the raw water output pipeline (61), there is a discharge pipeline (81), a raw water return pipeline (82), and a fresh water pipeline (83). The fresh water pipeline (83) is connected to a fresh water tank (73), which is used to store fresh water desalinated by the reverse polarity electrodialysis equipment (40). At the end of the fresh water tank (73) opposite to the fresh water pipeline (83), there is an output pump (36). The output pump (36) is connected to a use pipeline (84) and a return pipeline (85). The return pipeline (85) is equipped with a return valve (18), which is used to perform a return procedure when the conductivity of the raw water in the raw water tank (71) is high. The return valve (18) is opened accordingly to return the fresh water to the raw water tank (71).

5. The inverted-polarity electrodialysis treatment system as described in claim 4, wherein, The return pipeline (85) is further equipped with a return flow meter (30), and during the return process, the regulating valve (10) controls the flow rate of fresh water returned to the raw water tank (71) according to the return flow meter (30).

6. The inverted-polarity electrodialysis treatment system as described in claim 4, wherein, The raw water tank (71), the polar water tank (72) and the fresh water tank (73) are each equipped with a conductivity meter (31, 32, 33) to detect the conductivity of the raw water, polar water and fresh water respectively.

7. The inverted-polarity electrodialysis treatment system as described in claim 6, wherein, The discharge pipeline (81), the raw water return pipeline (82) and the fresh water pipeline (83) are each equipped with a valve body (15, 16, 17), and the raw water output pipeline (61) is equipped with a fresh water conductivity meter (23), a fresh water pressure meter (24) and a fresh water flow meter (25), and the opening and closing of the valve bodies (15, 16, 17) can be controlled according to the reading of the fresh water conductivity meter (23).

8. The inverted-polarity electrodialysis treatment system as described in claim 7, wherein, The concentrate output pipeline (63) is further provided with a concentrate conductivity meter (26), a concentrate pressure meter (27) and a concentrate flow meter (28); and the reverse polarity electrodialysis device (40) is provided with a rectifier, and the conductivity meter (31), the freshwater conductivity meter (23), the concentrate conductivity meter (26) and the rectifier are respectively coupled to a control system (402), and the control system defines a conductivity range, and when the conductivity of the conductivity meter (31), the freshwater conductivity meter (23) and the concentrate conductivity meter (26) exceeds the conductivity range, the rectifier will be controlled accordingly to adjust the voltage or current of the reverse polarity electrodialysis device (40).

9. The inverted-polarity electrodialysis treatment system as described in any one of claims 1 to 8, wherein, The raw water output pipeline (61) and the concentrated water output pipeline (63) are each equipped with an output valve (6, 9). Each of the raw water output pipeline (61) and the concentrated water output pipeline (63) has a reversing pipeline (86, 87) before its output valve (6, 9). The reversing pipelines (86, 87) are each equipped with a reversing control valve (7, 8), which are respectively connected to the concentrated water output pipeline (63) and the raw water output pipeline (63). The output pipeline (61) is provided with the output valve (6, 9) at the end of the pipeline. When the reverse polarity electrodialysis device (40) is in positive polarity operation mode, the input valve (1) and the output valve (6, 9) are opened and the reverse polarity control valve (7, 8) is closed. When the reverse polarity electrodialysis device (40) is in reverse polarity operation mode, the input valve (1) and the reverse polarity control valve (7, 8) are opened and the output valve (6, 9) is closed.

10. The inverted-polarity electrodialysis treatment system as described in any one of claims 1 to 8, wherein, The end of the extreme water output pipeline (62) is further connected to a raw water return pipeline (91), an extreme water return pipeline (92), and an extreme water discharge pipeline (93); the raw water return pipeline (91) is connected to the raw water tank (71), and the extreme water return pipeline (92) is connected to the extreme water tank (72); and the raw water return pipeline (91), the extreme water return pipeline (92), and the extreme water discharge pipeline (93) are each equipped with a switch valve (11, 12, 13).

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