Ionic membrane electrochemical water treatment device and technological process thereof

Abstract

The invention relates to an ionic membrane electrochemical water treatment device and a technological process thereof. The problems that solid-liquid separation is not thorough, pH is unbalanced, and environmental pollution and resource waste exist in existing electrochemical water treatment are effectively solved. According to the technical scheme, the ionic membrane electrochemical water treatment device can achieve stepped separation of suspended solids, the follow-up ionic membrane pollution risk is reduced, it is guaranteed that an ionic membrane electrolysis box can be used for a long time, a multi-stage filtering mechanism can be cleaned through a cleaning mechanism, frequent replacement of a filter element is avoided, and the effects of efficient pretreatment and solid-liquid separation are achieved; meanwhile, a bipolar membrane and a cationic membrane are adopted, H + generated by dissociating water through the bipolar membrane is injected into the middle area to neutralize OH-, the neutral environment is maintained, generated OH-enters the anode area to neutralize acid wastewater, and pH self-balance is kept; the filtrate of the filter press is returned to the multi-stage filtering mechanism for re-treatment, so that the waste of water resources is effectively avoided, and meanwhile, the pollution of the filtrate to the environment can be prevented.

Description

Technical Field

[0001] The present invention relates to the technical field of wastewater treatment, and particularly relates to an ion membrane electrochemical water treatment device and its process flow. Background Art

[0002] With the increasing development of electrochemical technologies, such as electroadsorption technology, which is also known as capacitive deionization technology or capacitive desalination technology, has been increasingly emphasized. Due to its characteristics of high efficiency, low energy consumption, and simple process, it has been gradually applied in the fields of wastewater treatment, drinking water treatment, material conversion, etc.

[0003] With the increasing demand for industrial wastewater treatment, traditional electrochemical water treatment technologies face multiple challenges. In the prior art, the electrochemical method often realizes ion separation through a single ion membrane, but there are the following problems:

[0004] Incomplete solid-liquid separation: In the pretreatment stage, it relies on simple precipitation or single-stage filtration, which is difficult to effectively remove suspended solids and colloids, resulting in serious pollution of the subsequent electrolytic membrane and a decrease in efficiency;

[0005] pH imbalance: During the electrolysis process, the anodic region is overly acidified due to the enrichment of H ﹢ , accelerating electrode corrosion; the cathodic region causes scaling due to the accumulation of OH ﹣ , and frequent addition of acids and alkalis is required for adjustment, increasing the operating cost;

[0006] Environmental pollution and resource waste: Most of the sludge filtered out through the inclined plate sedimentation tank or filtration during traditional water treatment is directly discharged through a filter press, which also contains part of the water body. If directly discharged, it will not only cause serious environmental pollution but also result in waste of water resources.

[0007] In view of the above, we provide an ion membrane electrochemical water treatment device and its process flow to solve the above problems. Summary of the Invention

[0008] In view of the above situation, the present invention provides an ion membrane electrochemical water treatment device and its process flow. The device can achieve stepped separation of suspended solids, reduce the risk of subsequent ion membrane pollution, ensure the long-term use of the ion membrane electrolysis tank, can clean the multi-stage filtration mechanism, avoid frequent replacement of filter elements, and achieve the functions of efficient pretreatment and solid-liquid separation; and at the same time, a bipolar membrane and a cationic membrane are used to maintain pH self-balance.

[0009] An ion membrane electrochemical water treatment device and its process flow include a first cyclone for preliminarily separating solid and liquid of raw water;

[0010] A multi-stage filtration mechanism, connected to the water outlet of the first cyclone, for performing multi-stage filtration on the separated water, and a cleaning mechanism capable of cleaning the filter element is arranged inside the multi-stage filtration mechanism;

[0011] Ion exchange membrane electrolysis cell, connected to the water outlet of the multi-stage filtration mechanism. On both sides inside the ion exchange membrane electrolysis cell, a positive electrode and a negative electrode are respectively arranged. A bipolar membrane is arranged near the positive electrode side inside the ion exchange membrane electrolysis cell, and a plurality of cation exchange membranes are arranged in parallel near the negative electrode side, so that an anode area, an intermediate area and a cathode area are formed inside the ion exchange membrane electrolysis cell;

[0012] Inclined plate sedimentation tank, connected to the water outlet of the cathode area;

[0013] Second cyclone, connected to the water outlets of the anode area and the intermediate area, for acid-base neutralization and secondary filtration;

[0014] Water storage tank, respectively connected to the water outlets of the inclined plate sedimentation tank and the second cyclone;

[0015] Filter press, connected to the slag discharge ports of the first cyclone, the multi-stage filtration mechanism, the inclined plate sedimentation tank and the second cyclone, for treating sediment, and the filtrate outlet of the filter press is connected to the water inlet of the multi-stage filtration mechanism to form a circulating treatment loop.

[0016] Preferably, the bipolar membrane in the ion exchange membrane electrolysis cell is arranged near the positive electrode, separating the anode area from the intermediate area; the plurality of cation exchange membranes are arranged in parallel on the side of the bipolar membrane near the negative electrode and at equal intervals, separating the intermediate area from the cathode area.

[0017] Preferably, the anion exchange layer of the bipolar membrane faces the anode area, and the cation exchange layer faces the intermediate area; the cation exchange membrane allows cations to pass through and blocks anions.

[0018] Preferably, the multi-stage filtration mechanism includes an upper filtration pipe, a middle filtration pipe and a lower filtration pipe. The upper filtration pipe includes an upper pipe, a first inner pipe and a first filtration layer. The first inner pipe is fixedly connected inside the upper pipe, and the first filtration layer is horizontally fixedly connected inside the first inner pipe. The top of the upper pipe is communicated with the first cyclone through a pipeline.

[0019] Preferably, the middle filtration pipe includes a middle pipe, a second inner pipe, a first upper ring pipe and a second filtration layer. The middle pipe is fixedly connected to the bottom end of the upper filtration pipe through a flange. The first upper ring pipe and the second inner pipe are respectively fixedly connected to the top end and the bottom end inside the middle pipe, and the second filtration layer is horizontally fixedly installed inside the second inner pipe.

[0020] Preferably, the lower - layer filter pipe includes a lower - layer pipe, a third inner pipe, a second upper - ring pipe, a third filter layer, a water outlet pipe, and a sludge hopper. The lower - layer pipe is fixedly connected to the bottom of the middle - layer pipe through a flange. The second upper - ring pipe and the third inner pipe are respectively fixedly connected to the top and bottom inside the lower - layer pipe, and the third filter layer is horizontally and fixedly installed inside the third inner pipe. The water outlet pipe is fixedly connected to the bottom side of the third inner pipe and penetrates through the side of the lower - layer pipe. The sludge hopper is fixedly connected to the bottom of the lower - layer pipe. Conical diversion plates are fixedly connected to the bottoms of the outer sides of the first upper - ring pipe and the second upper - ring pipe. Annular gaps are formed between the upper - layer pipe and the first inner pipe, between the middle - layer pipe and the second inner pipe and the first upper - ring pipe, and between the lower - layer pipe and the third inner pipe and the second upper - ring pipe. The annular gaps communicate with the sludge hopper.

[0021] Preferably, the cleaning mechanism includes an electric push rod, an annular sealing plate, and an annular pulse flushing pipe. The annular sealing plate is fixedly connected to the end of the movable rod body of the electric push rod, and electric push rods are arranged around the upper surface of the annular sealing plate. Cleaning mechanisms are arranged inside the upper - layer pipe, the middle - layer pipe, and the lower - layer pipe. The three annular sealing plates are respectively vertically inserted into the tops of the first inner pipe, the second inner pipe, and the third inner pipe to block the annular gaps. The three annular pulse flushing pipes are respectively fixedly installed on the inner wall of the upper - layer pipe, the bottom of the first upper - ring pipe, and the bottom of the second upper - ring pipe, and the pulse nozzles on the three annular pulse flushing pipes are respectively corresponding to the upper surfaces of the first filter layer, the second filter layer, and the third filter layer in the form of an annular array.

[0022] Preferably, the water outlets of the ion - exchange membrane electrolysis tank near the middle area and the anode area are communicated with the water inlets of the second cyclone through a connecting pipe. The water outlet of the ion - exchange membrane electrolysis tank near the cathode area is communicated with the water inlet of the inclined - plate sedimentation tank through a pipeline. Differential pressure sensors are installed inside the upper - layer filter pipe, the middle - layer filter pipe, and the lower - layer filter pipe.

[0023] Preferably, pH meters are fixedly installed on the pipelines connecting the inclined - plate sedimentation tank and the second cyclone to the water storage tank to detect the pH of the water flowing out of the inclined - plate sedimentation tank and the second cyclone. A solenoid valve for controlling the water flow rate inside it is fixedly installed on the pipeline at the water inlet of the ion - exchange membrane electrolysis tank.

[0024] The technological process of an ion - exchange membrane electrochemical water treatment device includes the following steps:

[0025] First, raw water enters the first cyclone for solid - liquid separation, and the separated water enters the multi - stage filtering mechanism for filtering;

[0026] II. The filtered water enters the ion-exchange membrane electrolysis cell, and a certain amount of deionized water or dilute acid solution is injected into the anode area as the starting liquid (after normal operation, it completely relies on the self-produced water from the hydrolysis of the bipolar membrane and does not require continuous external water addition). Electricity is applied to the positive and negative electrodes. Under the action of the electric field, the bipolar membrane begins to hydrolyze, and the generated H ﹢ can only enter the middle area through the bipolar membrane and neutralize with the OH ﹣ in the middle area to maintain a neutral environment; the OH ﹣ enters the anode area to neutralize the acidic water and inhibit the generation of Cl 2 ;

[0027] A reduction reaction occurs in the cathode area, causing the pH value inside to increase. The cations in the middle area migrate through the cation exchange membrane to the cathode area, and the cations in the cathode area are reduced or precipitated. The effluent from the cathode area flows into the inclined plate sedimentation tank for sedimentation;

[0028] III. The effluents from the anode area and the middle area enter the second cyclone. The two can neutralize each other to form water with a nearly neutral pH value. At the same time, neutralizing agents can be added to adjust the pH, and then secondary filtration is carried out through the second cyclone;

[0029] IV. The effluent in the cathode area enters the inclined plate sedimentation tank. The inclined plate sedimentation tank is used to sediment and filter the effluent from the cathode area. At the same time, neutralizing agents can be added to the inclined plate sedimentation tank to neutralize the water inside and reduce the alkalinity of the water inside;

[0030] V. The effluents from the inclined plate sedimentation tank and the second cyclone flow into the storage water tank and can be used as industrial water;

[0031] VI. The sediments from the first cyclone, the multi-stage filtration mechanism, the inclined plate sedimentation tank, and the second cyclone enter the filter press. The filter cake is pressed into blocks and transported out, and the filtrate returns to the first cyclone for recycling treatment.

[0032] The beneficial effects of the above technical solutions are as follows:

[0033] The ion-exchange membrane electrochemical water treatment device can achieve step-by-step separation of suspended substances through the combined use of the first cyclone and the multi-stage filtration mechanism, reducing the risk of subsequent ion-exchange membrane pollution, ensuring that the ion-exchange membrane electrolysis cell can be used for a long time. The multi-stage filtration mechanism can be cleaned by the cleaning mechanism, avoiding frequent replacement of filter elements, improving the treatment efficiency at the same time, and realizing the functions of efficient pretreatment and solid-liquid separation; and at the same time, a bipolar membrane and a cation exchange membrane are used. The H ﹢ generated by the dissociation of water by the bipolar membrane is injected into the middle area to neutralize the OH ﹣ , maintaining a neutral environment. The generated OH ﹣Enter the anode area to neutralize the acidic wastewater, making the pH value of the treated water body closer to neutral and maintaining pH self - balance; the filtrates of the first cyclone, multi - stage filtration mechanism, inclined - plate sedimentation tank, and second cyclone all return to the multi - stage filtration mechanism for re - treatment, effectively avoiding water resource waste, preventing the filtrate from polluting the environment, and being more convenient for wastewater treatment. Brief Description of the Drawings

[0034] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0035] Figure 2 It is a schematic cross - sectional view of the ion - exchange membrane electrolysis tank of the present invention;

[0036] Figure 3 It is a schematic diagram of the ion - exchange membrane electrolysis tank of the present invention;

[0037] Figure 4 It is a schematic diagram of the connecting elbow structure of the present invention;

[0038] Figure 5 It is a schematic diagram of the multi - stage filtration mechanism of the present invention;

[0039] Figure 6 It is a schematic diagram of the split state of the multi - stage filtration mechanism of the present invention;

[0040] Figure 7 It is a schematic diagram of the middle - layer filter tube of the present invention;

[0041] Figure 8 For the present invention Figure 7 Cross - sectional schematic diagram;

[0042] Figure 9 For the present invention Figure 8 Explosion - state schematic diagram;

[0043] Figure 10 It is a schematic diagram of the raw - water treatment process of the present invention;

[0044] Figure 11 It is a schematic diagram of the working process of the filter press of the present invention.

[0045] In the figure: 1. First cyclone; 2. Multi-stage filtration mechanism; 3. Ion-exchange membrane electrolysis tank; 301. Positive electrode; 302. Negative electrode; 303. Bipolar membrane; 304. Cationic membrane; 305. Anodic zone; 306. Intermediate zone; 307. Cathodic zone; 4. Inclined plate sedimentation tank; 5. Second cyclone; 6. Water storage tank; 7. Filter press; 8. Upper-layer filtration pipe; 801. Upper-layer pipe; 802. First inner pipe; 803. First filtration layer; 9. Middle-layer filtration pipe; 901. Middle-layer pipe; 902. Second inner pipe; 903. First upper ring pipe; 904. Second filtration layer; 10. Lower-layer filtration pipe; 1001. Lower-layer pipe; 1002. Third inner pipe; 1003. Second upper ring pipe; 1004. Third filtration layer; 1005. Water outlet pipe; 1006. Sludge hopper; 11. Conical deflector; 12. Annular gap; 13. Electric push rod; 14. Annular sealing plate; 15. Annular pulse flushing pipe; 16. Connecting pipe; 17. PH meter; 18. Solenoid valve; 19. Differential pressure sensor. Detailed implementation mode

[0046] Regarding the foregoing and other technical contents, features and effects of the present invention, they can be clearly presented in the following detailed description of the embodiments in conjunction with the attached Figures 1 to 11 In the detailed description of the embodiments, the structural contents mentioned in the following embodiments are all referenced to the accompanying drawings of the specification.

[0047] This embodiment provides an ion-exchange membrane electrochemical water treatment device and its process flow. As shown in the attached Figures 1-11 figure, it includes a first cyclone 1 for initially separating solid and liquid in raw water. Other wastewater such as industrial drainage first enters the first cyclone 1 from the water inlet end of the first cyclone 1. The wastewater rotates in the first cyclone 1, and the particulate matter in the wastewater is separated through centrifugal action and precipitates at the bottom, while the preliminarily filtered water is discharged from the middle water outlet of the first cyclone 1 and enters the multi-stage filtration mechanism 2;

[0048] The multi-stage filtration mechanism 2 is connected to the water outlet of the first cyclone 1 and is used for multi-stage filtration of the separated water. The multi-stage filtration mechanism includes an upper-layer filtration pipe 8, a middle-layer filtration pipe 9, and a lower-layer filtration pipe 10. The upper-layer filtration pipe 8 includes an upper-layer pipe 801, a first inner pipe 802, and a first filtration layer 803. The first inner pipe 802 is fixedly connected inside the upper-layer pipe 801, and the first filtration layer 803 is horizontally fixedly connected inside the first inner pipe 802. The first filtration layer 803 is a quartz sand filter plate, which can filter impurity particles with a filtration accuracy of about 20 - 50 μm, mainly intercepting suspended matter, sediment, and large particle impurities. The top of the upper-layer pipe 801 is connected to the first cyclone 1 through a pipeline.

[0049] The middle - layer filter tube 9 includes a middle - layer tube 901, a second inner tube 902, a first upper ring tube 903, and a second filter layer 904. The middle - layer tube 901 is fixedly connected to the bottom end of the upper - layer filter tube 8 through a flange. The first upper ring tube 903 and the second inner tube 902 are respectively fixedly connected to the top end and the bottom end inside the middle - layer tube 901, and the second filter layer 904 is horizontally and fixedly installed inside the second inner tube 902. The second filter layer 904 can adopt an activated carbon filter plate, which can adsorb organic matters, residual chlorine, odors, and some heavy metal ions (such as Pb 2﹢ , Cd 2﹢ ), improve the chromaticity and odor of the water quality, and protect the subsequent electrolytic membrane from organic pollution.

[0050] The lower - layer filter tube 10 includes a lower - layer tube 1001, a third inner tube 1002, a second upper ring tube 1003, a third filter layer 1004, a water outlet pipe 1005, and a sludge hopper 1006. The lower - layer tube 1001 is fixedly connected to the bottom of the middle - layer tube 901 through a flange. The second upper ring tube 1003 and the third inner tube 1002 are respectively fixedly connected to the top end and the bottom end inside the lower - layer tube 1001, and the third filter layer 1004 is horizontally and fixedly installed inside the third inner tube 1002. The third filter layer 1004 can adopt a polypropylene melt - blown filter element or a ceramic filter element, which can intercept colloids, microorganisms, and tiny particles (the filtration accuracy reaches <1μm), ensure that the turbidity of the water quality entering the electrolytic cell is <1NTU, and reduce the risk of membrane pollution; the water outlet pipe 1005 is fixedly connected to the bottom side of the third inner tube 1002 and penetrates through the side of the lower - layer tube 1001, and the sludge hopper 1006 is fixedly connected to the bottom of the lower - layer tube 1001.

[0051] Conical guide plates 11 are fixedly connected to the bottom sides of the outer sides of the first upper ring tube 903 and the second upper ring tube 1003. The top end of the first upper ring tube 903 abuts against the bottom end of the first inner tube 802, and the top end of the second upper ring tube 1003 abuts against the bottom end of the second inner tube 902, which can ensure the sealing between them; annular gaps 12 are provided between the upper - layer tube 801 and the first inner tube 802, between the middle - layer tube 901 and the second inner tube 902 and the first upper ring tube 903, and between the lower - layer tube 1001 and the third inner tube 1002 and the second upper ring tube 1003. The annular gaps 12 are communicated with the sludge hopper 1006. The cleaning mechanism can wash the impurities filtered on the first filter layer 803, the second filter layer 904, and the third filter layer 1004 into the annular gaps 12, and flow from the annular gaps 12 into the sludge hopper 1006 at the bottom, which is convenient for flushing the first filter layer 803, the second filter layer 904, and the third filter layer 1004, thereby prolonging their service life.

[0052] Moreover, a cleaning mechanism for cleaning the filter element is provided inside the multi-stage filtering mechanism 2. The cleaning mechanism includes an electric push rod 13, an annular sealing plate 14 and an annular pulse flushing pipe 15. The annular sealing plate 14 is fixedly connected to the end of the movable rod body of the electric push rod 13, and electric push rods 13 are arranged around the upper surface of the annular sealing plate 14. Cleaning mechanisms are provided inside the upper layer pipe 801, the middle layer pipe 901 and the lower layer pipe 1001. The three annular sealing plates 14 are respectively vertically inserted into the tops of the first inner pipe 802, the second inner pipe 902 and the third inner pipe 1002 for blocking the annular gap 12, so that the water flow coming out of the first cyclone 1 can only flow through the first inner pipe 802, the second inner pipe 902 and the third inner pipe 1002, and the water flow sequentially passes through the first filter layer 803, the second filter layer 904 and the third filter layer 1004, thereby filtering the water; the three annular pulse flushing pipes 15 are respectively fixedly installed on the inner wall of the upper layer pipe 801, the bottom of the first upper ring pipe 903 and the bottom of the second upper ring pipe 1003, and the pulse nozzles on the three annular pulse flushing pipes 15 respectively correspond to the upper surfaces of the first filter layer 803, the second filter layer 904 and the third filter layer 1004 in the form of an annular array. The pulse nozzles are inclined at 30°-60° to ensure full coverage of the upper surfaces of the first filter layer 803, the second filter layer 904 and the third filter layer 1004. The three annular pulse flushing pipes 15 are all communicated with an external pipeline. The electric push rod 13 can drive the annular sealing plate 14 to move upward. When it is necessary to clean the first filter layer 803, the second filter layer 904 and the third filter layer 1004, first close the pipeline at the top of the upper layer filter pipe 8 to cut off the water flow, so that the multi-stage filtering mechanism 2 stops working first, and then drive the annular sealing plate 14 to rise through the electric push rod 13. The pulse nozzles on the three annular pulse flushing pipes 15 eject a high-pressure gas-water mixture flow (0.5-1.0 MPa) reversely from the outside of the filter element through an external pipeline, penetrate the pores of the filter material, wash away the attached impurities from the surface, and wash the impurities from the surroundings of the first filter layer 803, the second filter layer 904 and the third filter layer 1004 into the annular gap 12 and discharge them from the sludge hopper 1006 into the filter press 7.

[0053] An ion-exchange membrane electrolysis tank 3 connected to the water outlet of the multi-stage filtration mechanism 2. On both sides inside the ion-exchange membrane electrolysis tank 3, a positive electrode 301 and a negative electrode 302 are respectively arranged. A bipolar membrane 303 is arranged near the positive electrode side inside the ion-exchange membrane electrolysis tank 3, and a plurality of cation exchange membranes 304 are arranged in parallel near the negative electrode side, so that an anode region 305, a middle region 306 and a cathode region 307 are formed inside the ion-exchange membrane electrolysis tank 3; the bipolar membrane 303 in the ion-exchange membrane electrolysis tank 3 is arranged near the positive electrode 301, separating the anode region 305 from the middle region 306; the plurality of cation exchange membranes 304 are arranged in parallel on one side of the bipolar membrane 303 near the negative electrode 302 and at equal intervals, separating the middle region 306 from the cathode region 307. The regions separated by the plurality of cation exchange membranes 304 in the middle region 306 can be interconnected through a communicating elbow outside the ion-exchange membrane electrolysis tank 3, enabling water to enter all regions in the middle region 306 and ensuring the circulation of water;

[0054] The anion exchange layer of the bipolar membrane 303 faces the anode region 305, and the cation exchange layer faces the middle region 306; the cation exchange membrane 304 allows cations to pass through and blocks anions, enabling ordinary cations (such as Na ﹢ , Ca 2﹢ ) between the bipolar membrane 303 and the cation exchange membranes 304 and among the plurality of cation exchange membranes 304 in the middle region 306 to migrate through the cation exchange membrane 304 towards the cathode region 307 under the drive of an electric field, but being blocked by the bipolar membrane 303 and unable to return reversely, so that cations are enriched in the cathode region 307 directionally, facilitating subsequent reduction (such as Cu 2﹢ →Cu↓) or precipitation recovery;

[0055] The H ﹢ generated by the bipolar membrane 303 can only enter the middle region 306 through the bipolar membrane 303 and neutralize with the OH ﹣ in the middle region 306, maintaining a neutral environment, preventing scaling of salts such as CaCO 3 , and improving the cation migration efficiency; the OH ﹣ enters the anode region 305 to neutralize acidic water and inhibit the generation of Cl 2 .

[0056] A lamella clarifier 4 connected to the water outlet of the cathode region 307. After the water containing a large amount of cations in the cathode region 307 in the ion-exchange membrane electrolysis tank 3 enters the lamella clarifier 4, most of the cations can be precipitated through their chemical reactions with anions or by adding a flocculant into it, and at the same time, the pH value is neutralized to avoid the water body having too high a pH value. The precipitate can be discharged into a filter press 7 through a bottom pipeline;

[0057] The second cyclone 5 connected to the water outlets of the anode region 305 and the middle region 306 is used for acid-base neutralization and secondary filtration; the water outlets of the ion-exchange membrane electrolysis tank 3 near the middle region 306 and the anode region 305 are communicated with the water inlet of the second cyclone 5 through a connecting pipe 16. The water body in the middle region 306 is filtered again by the second cyclone 5. A pH sensor and an automatic dosing device can be installed outside the second cyclone 5 to facilitate detecting the pH value of the water body in the second cyclone 5 and automatically dosing a neutralizing agent according to the pH value to neutralize the pH value of the water body; the water outlet of the ion-exchange membrane electrolysis tank 3 near the cathode region 307 is communicated with the water inlet of the inclined plate sedimentation tank 4 through a pipeline. Differential pressure sensors 19 are installed inside the upper filtering pipe 8, the middle filtering pipe 9, and the lower filtering pipe 10. The differential pressure sensors 19 can respectively detect the pressure differences between the upper filtering pipe 8, the middle filtering pipe 9, and the lower filtering pipe 10. When the pressure differences are quite different, it proves that the corresponding filter element is severely blocked and the filtering effect on the water body becomes poor. The cleaning mechanism can be controlled by a control unit to clean the first filtering layer 803, the second filtering layer 904, and the third filtering layer 1004.

[0058] When the differential pressure sensor 19 detects a large pressure difference, the cleaning mechanism is triggered. The pipeline at the top of the upper filtering pipe 8 is controlled to close, and the annular sealing plate 14 is driven to rise by the electric push rod 13. The pulse nozzles on the three annular pulse washing pipes 15 eject a high-pressure gas-water mixture flow (0.5 - 1.0 MPa) reversely from the outside of the filter element through an external pipeline, penetrate the pores of the filter material, wash away the attached impurities from the surface, and flush the impurities from the peripheries of the first filtering layer 803, the second filtering layer 904, and the third filtering layer 1004 into the annular gap 12, and the impurities are collected in the sludge hopper 1006 from the annular gap 12. A liquid level sensor can be set in the sludge hopper 1006. When there is more sludge water stored in the sludge hopper 1006, the bottom pipeline is opened to convey the sludge to the filter press 7.

[0059] The water storage tank 6 is respectively connected to the water outlets of the inclined plate sedimentation tank 4 and the second cyclone 5. PH meters 17 are fixedly installed on the pipelines through which the inclined plate sedimentation tank 4 and the second cyclone 5 are communicated with the water storage tank 6, and can detect the pH of the water bodies flowing out of the inclined plate sedimentation tank 4 and the second cyclone 5. When it is detected that the pH value of the water body flowing out of the inclined plate sedimentation tank 4 or the second cyclone 5 is not neutral, the electrolysis voltage inside the ion-exchange membrane electrolysis tank 3, the water circulation rate of the ion-exchange membrane electrolysis tank 3, or the addition amounts of the flocculant and the neutralizing agent can be adjusted in time through control, so as to adjust the treatment effect of the water body in time; a solenoid valve 18 for controlling the water flow rate inside it is fixedly installed on the pipeline at the water inlet of the ion-exchange membrane electrolysis tank 3, which is convenient for adjusting the water flow rate, thereby adjusting the electrolysis effect of the ion-exchange membrane electrolysis tank 3.

[0060] A filter press 7 connected to the slag discharge ports of the first cyclone 1, the multi-stage filtration mechanism 2, the inclined plate sedimentation tank 4, and the second cyclone 5 is used to treat the sediment. The filtrate outlet of the filter press 7 is connected to the water inlet of the multi-stage filtration mechanism to form a circulating treatment loop. The filter press 7 dehydrates and presses the impurity particles, discharges the filter cake to the outside, and returns the filtrate to the water inlet end of the multi-stage filtration mechanism 2 for re-treatment.

[0061] A technological process of an ion-exchange membrane electrochemical water treatment device includes the following steps:

[0062] I. Raw water enters the first cyclone 1 for solid-liquid separation, and the separated water enters the multi-stage filtration mechanism 2 for filtration;

[0063] II. The filtered water enters the ion-exchange membrane electrolysis cell 3, and a certain amount of deionized water or dilute acid solution is injected into the anode area as the starting liquid. After normal operation, it completely depends on the hydrolysis of the bipolar membrane 303 to produce its own water, and there is no need to continuously add external water. Electric current is applied to the positive electrode 301 and the negative electrode 302. Under the action of the electric field, the bipolar membrane 303 starts to hydrolyze, and the generated H ﹢ can only enter the intermediate area 306 through the bipolar membrane 303 and neutralize with the OH in the intermediate area 306 to maintain a neutral environment; OH ﹣ enters the anode area 305 to neutralize the acidic water and inhibit the generation of Cl ﹣ ; 2 A reduction reaction occurs in the cathode area, increasing the pH value inside. The cations in the intermediate area 306 migrate through the cation exchange membrane 304 to the cathode area 307. The cations in the cathode area 307 are reduced or precipitated, and the effluent from the cathode area 307 flows into the inclined plate sedimentation tank 4 for sedimentation;

[0064] III. The effluent from the anode area 305 and the intermediate area 306 enters the second cyclone 5. The two can neutralize each other to form water with a nearly neutral pH value. At the same time, a neutralizing agent can be added to adjust the pH, and then secondary filtration is carried out through the second cyclone 5;

[0065] IV. The effluent in the cathode area 307 enters the inclined plate sedimentation tank 4. The inclined plate sedimentation tank 4 is used to sediment and filter the effluent from the cathode area. At the same time, a neutralizing agent can be added to the inclined plate sedimentation tank 4 to neutralize the internal water and reduce the alkalinity of the internal water;

[0066] V. The effluent from the inclined plate sedimentation tank 4 and the second cyclone 5 flows into the storage tank 6 and can be used as industrial water;

[0067] VI. The sediment in the first cyclone 1, the multi-stage filtration mechanism 2, the inclined plate sedimentation tank 4, and the second cyclone 5 enters the filter press 7. The filter residue is pressed into blocks and transported out, and the filtrate returns to the first cyclone 1 for circulating treatment.

[0068] VII. The sediment in the first cyclone 1, the multi-stage filtration mechanism 2, the inclined plate sedimentation tank 4, and the second cyclone 5 enters the filter press 7. The filter residue is pressed into blocks and transported out, and the filtrate returns to the first cyclone 1 for circulating treatment.

[0069] The above description is only for the purpose of illustrating the present invention. It should be understood that the present invention is not limited to the above embodiments, and various equivalent forms that conform to the idea of the present invention are within the protection scope of the present invention.

Claims

1. An ion membrane electrochemical water treatment device, characterized in that: include: The first cyclone (1) is used to perform preliminary solid-liquid separation on the raw water; A multi-stage filtering mechanism (2) is connected to the water outlet of the first cyclone (1) and is used to perform multi-stage filtering on the separated water, and a cleaning mechanism capable of cleaning the filter element is provided inside the multi-stage filtering mechanism (2); An ion membrane electrolysis box (3) is connected to the water outlet of the multi-stage filtering mechanism (2), wherein a positive electrode (301) and a negative electrode (302) are respectively arranged on both sides of the inside of the ion membrane electrolysis box (3), and a bipolar membrane (303) is arranged near the positive electrode side of the ion membrane electrolysis box (3) and a plurality of cationic membranes (304) are arranged in parallel near the negative electrode side, so that an anode area (305), an intermediate area (306) and a cathode area (307) are formed in the ion membrane electrolysis box (3); An inclined plate sedimentation tank (4) connected to the water outlet of the cathode region (307); The second cyclone (5) is connected to the water outlets of the anode area (305) and the intermediate area (3066) and is used for acid-base neutralization and secondary filtration; A water storage tank (6) is connected to the water outlets of the inclined plate sedimentation tank (4) and the second cyclone (5) respectively; The filter press (7) is connected to the first cyclone (1), the multi-stage filtering mechanism (2), the inclined plate sedimentation tank (4) and the slag discharge port of the second cyclone (5) for processing sediments, and the filtrate outlet of the filter press (7) is connected to the water inlet of the multi-stage filtering mechanism to form a circulation processing loop.

2. An ion membrane electrochemical water treatment device according to claim 1, characterized in that: The bipolar membrane (303) in the ion membrane electrolysis box (3) is arranged close to the positive electrode (301) to separate the anode area (305) and the middle area (306); the plurality of cationic membranes (304) are arranged in parallel on one side of the bipolar membrane (303) close to the negative electrode (302) with equal spacing to separate the middle area (306) and the cathode area (307).

3. An ion membrane electrochemical water treatment device according to claim 1, characterized in that: The anion exchange layer of the bipolar membrane (303) faces the anode region (305), and the cation exchange layer faces the middle region (306); the cation membrane (304) allows cations to pass through and blocks anions.

4. An ion membrane electrochemical water treatment device according to claim 1, characterized in that: The multi-stage filtering mechanism comprises an upper filter tube (8), a middle filter tube (9) and a lower filter tube (10); the upper filter tube (8) comprises an upper tube (801), a first inner tube (802) and a first filter layer (803); the first inner tube (802) is fixedly connected to the interior of the upper tube (801) and the first filter layer (803) is horizontally fixedly connected to the interior of the first inner tube (802); the top of the upper tube (801) is connected to the first cyclone (1) via a pipeline.

5. An ion membrane electrochemical water treatment device according to claim 4, characterized in that: The middle-layer filter tube (9) comprises a middle-layer tube (901), a second inner tube (902), a first upper ring tube (903) and a second filter layer (904); the middle-layer tube (901) is fixedly connected to the bottom end of the upper-layer filter tube (8) via a flange; the first upper ring tube (903) and the second inner tube (902) are respectively fixedly connected to the top and bottom ends inside the middle-layer tube (901); and the second filter layer (904) is horizontally fixedly installed inside the second inner tube (902).

6. An ion membrane electrochemical water treatment device according to claim 5, characterized in that: The lower layer filter tube (10) comprises a lower layer tube (1001), a third inner tube (1002), a second upper ring tube (1003), a third filter layer (1004), a water outlet pipe (1005) and a sludge hopper (1006); the lower layer tube (1001) is fixedly connected to the bottom of the middle layer tube (901) via a flange; the second upper ring tube (1003) and the third inner tube (1002) are respectively fixedly connected to the top and bottom ends of the lower layer tube (1001); the third filter layer (1004) is horizontally fixedly installed inside the third inner tube (1002); the water outlet pipe (1005) is fixedly connected to the side of the third inner tube (1002); The bottom of the lower tube (1001) is penetrated and arranged on the side of the lower tube (1001); the sludge hopper (1006) is fixedly connected to the bottom of the lower tube (1001); the bottoms of the outer sides of the first upper ring tube (903) and the second upper ring tube (1003) are fixedly connected with conical guide plates (11); annular gaps (12) are provided between the upper tube (801) and the first inner tube (802), between the middle tube (901) and the second inner tube (902) and the first upper ring tube (903), and between the lower tube (1001) and the third inner tube (1002) and the second upper ring tube (1003); and the annular gaps (12) are connected to the sludge hopper (1006).

7. An ion membrane electrochemical water treatment device according to claim 1, characterized in that: The cleaning mechanism comprises an electric push rod (13), an annular blocking plate (14) and an annular pulse flushing pipe (15); the annular blocking plate (14) is fixedly connected to the end of the movable rod body of the electric push rod (13), and the electric push rods (13) are arranged around the upper surface of the annular blocking plate (14); the upper tube (801), the middle tube (901) and the lower tube (1001) are all provided with cleaning mechanisms; the three annular blocking plates (14) are respectively vertically plugged into the first inner tube (802), the second inner tube (901) and the lower inner tube (1001). The top ends of the inner tube (902) and the third inner tube (1002) are used to seal the annular gap (12); the three annular pulse flushing tubes (15) are respectively fixedly mounted on the inner wall of the upper tube (801), the bottom of the first upper annular tube (903) and the bottom of the second upper annular tube (1003); and the pulse nozzles on the three annular pulse flushing tubes (15) are arranged in an annular array corresponding to the upper surfaces of the first filter layer (803), the second filter layer (904) and the third filter layer (1004).

8. An ion membrane electrochemical water treatment device according to claim 1, characterized in that: The water outlets of the ion membrane electrolysis box (3) close to the middle zone (306) and the anode zone (305) are connected to the water inlet of the second cyclone (5) through a connecting pipe (16); the water outlet of the ion membrane electrolysis box (3) close to the cathode zone (307) is connected to the water inlet of the inclined plate sedimentation tank (4) through a pipeline; and the upper filter tube (8), the middle filter tube (9) and the lower filter tube (10) are all installed with differential pressure sensors (19).

9. The ion membrane electrochemical water treatment device according to claim 1, characterized in that: A pH meter (17) is fixedly installed on the pipelines connecting the inclined plate sedimentation tank (4) and the second cyclone (5) with the water storage tank (6), and the pH of the water flowing out of the inclined plate sedimentation tank (4) and the second cyclone (5) can be tested. A solenoid valve (18) for controlling the flow rate of the water inside the ion membrane electrolysis box (3) is fixedly installed on the pipeline of the water inlet.

10. A process flow of the ion membrane electrochemical water treatment device according to any one of claims 1 to 9, characterized in that: The following steps are involved:

1. Raw water enters the first cyclone (1) for solid-liquid separation, and the separated water enters the multi-stage filtration mechanism (2) for filtration; Second, the filtered water enters the ion membrane electrolysis box (3), and a certain amount of deionized water or dilute acid solution is injected into the anode area as a starting liquid (after normal operation, it completely relies on the water dissociation of the bipolar membrane (303) to produce water, and there is no need to continuously add water externally). The positive electrode (301) and the negative electrode (302) are energized. Under the action of the electric field, the bipolar membrane (303) begins to dissociate water, and the generated H ﹢ can only enter the middle region (306) through the bipolar membrane (303) and interact with the OH ﹣ Neutralize, maintain a neutral environment; OH ﹣ Entering the anode area (305) to neutralize the acidic water and inhibit the generation of Cl2; A reduction reaction occurs in the cathode region, causing the pH value inside the cathode region to increase, and the cations in the intermediate region (306) migrate through the cation membrane (304) to the cathode region (307), and the cations in the cathode region (307) are reduced or precipitated. The effluent from the cathode region (307) flows into the inclined plate sedimentation tank (4) for sedimentation.

3. The effluent from the anode area (305) and the intermediate area (306) enters the second cyclone (5), where they can be neutralized to form water with a pH close to neutral. A neutralizing agent can also be added to adjust the pH, and then the water is filtered twice through the second cyclone (5); Fourth, the effluent from the cathode region (307) enters the inclined plate sedimentation tank (4), where the effluent from the cathode region is precipitated and filtered. At the same time, a neutralizing agent can be added to the inclined plate sedimentation tank (4) to neutralize the water inside the inclined plate sedimentation tank (4) to reduce the alkalinity of the water inside the inclined plate sedimentation tank; 5. The effluent from the inclined plate sedimentation tank (4) and the second cyclone (5) is collected in the water storage tank (6) and can be used as industrial water; 6. The sediment from the first hydrocyclone (1), the multi-stage filtering mechanism (2), the inclined plate sedimentation tank (4) and the second hydrocyclone (5) enters the filter press (7), the filter residue is pressed into blocks and transported out, and the filtrate returns to the first hydrocyclone (1) for cyclic treatment.

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