Ion membrane electrochemical water treatment device and process flow thereof

Abstract

The application relates to an ion membrane electrochemical water treatment device and a process flow thereof, and effectively solves the problems of incomplete solid-liquid separation, pH imbalance, environmental pollution and resource waste in existing electrochemical water treatment; the technical solution comprises the following steps: the ion membrane electrochemical water treatment device can realize step-by-step separation of suspended matters, reduce the pollution risk of subsequent ion membranes, ensure that the ion membrane electrolysis box can be used for a long time, the cleaning mechanism can clean the multi-stage filtering mechanism, frequent replacement of filter elements is avoided, the effects of efficient pretreatment and solid-liquid separation are realized; meanwhile, a bipolar membrane and a cation membrane are adopted, H ﹢ OH is injected into the middle zone and OH ﹣ is maintained in a neutral environment, OH ﹣ generated by the bipolar membrane is neutralized into the anode zone to neutralize acidic wastewater and keep pH self-balanced; the filtrate of the filter press is returned to the multi-stage filtering mechanism to be treated again, water resource waste is effectively avoided, and the filtrate can also prevent environmental pollution.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of wastewater treatment, in particular to an ion membrane electrochemical water treatment device and a process flow thereof. BACKGROUND

[0002] Electrochemical technology is developing rapidly, and technologies such as electrosorption are increasingly valued. Electrosorption technology can also be referred to as capacitive deionization technology or capacitive desalination technology. Due to its high efficiency, low energy consumption, and simple process, it has gradually been applied in the fields of wastewater treatment, drinking water treatment, and material conversion.

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

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

[0005] pH imbalance: during the electrolysis process, the anode area is over-acidified due to the accumulation of H ﹢ , which accelerates electrode corrosion; the cathode area causes fouling due to the accumulation of OH ﹣ , which requires frequent addition of acid and base adjustment, increasing operating costs;

[0006] Environmental pollution and resource waste: during traditional water treatment, part of the sludge discharged through the filter press contains some water, which, if directly discharged, not only causes serious environmental pollution, but also wastes water resources.

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

[0008] In view of the above, we provide an ion membrane electrochemical water treatment device and a process flow thereof to solve the above problems.

[0009] An ion membrane electrochemical water treatment device and a process flow thereof, comprising a first cyclone for preliminary solid-liquid separation of raw water;

[0010] A multi-stage filtration mechanism is connected to the water outlet of the first cyclone for multi-stage filtration of the separated water, and the multi-stage filtration mechanism is internally provided with a cleaning mechanism for cleaning the filter core.

[0011] The ion membrane electrolysis tank is connected with the water outlet of the multi-stage filtering mechanism, two sides inside the ion membrane electrolysis tank are respectively provided with positive and negative electrodes, a bipolar membrane is arranged near the positive electrode side inside the ion membrane electrolysis tank, and a plurality of cation membranes are arranged in parallel near the negative electrode side, so that an anode area, an intermediate area and a cathode area are formed in the ion membrane electrolysis tank.

[0012] The inclined plate sedimentation tank is connected with the water outlet of the cathode area.

[0013] The second cyclone is connected with the water outlets of the anode area and the intermediate area, and is used for acid-base neutralization and secondary filtration.

[0014] The water storage tank is connected with the water outlets of the inclined plate sedimentation tank and the second cyclone.

[0015] The filter press is connected with the discharge ports of the first cyclone, the multi-stage filtering mechanism, the inclined plate sedimentation tank and the second cyclone, and is used for treating the precipitates, and the filtrate outlet of the filter press is connected with the water inlet of the multi-stage filtering mechanism, so as to form a circulating treatment loop.

[0016] Preferably, the bipolar membrane in the ion membrane electrolysis tank is arranged near the positive electrode, and separates the anode area and the intermediate area; the plurality of cation membranes are arranged in parallel on the side of the bipolar membrane near the negative electrode and have equal spacing, and separate the intermediate area and 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 membrane allows the passage of cations and blocks the passage of anions.

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

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

[0020] Preferably, the lower layer filter pipe comprises 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 at the bottom of the middle layer pipe through a flange, the second upper ring pipe and the third inner pipe are fixedly connected at the top and bottom of the inside of the lower layer pipe respectively, and the third filter layer is horizontally fixedly installed inside the third inner pipe, the water outlet pipe is fixedly connected at the bottom of the side of the third inner pipe and penetrates through the side of the lower layer pipe, the sludge hopper is fixedly connected at the bottom of the lower layer pipe, the bottom of the outside of the first upper ring pipe and the second upper ring pipe are fixedly connected with conical guide plates, annular gaps are arranged 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, and the annular gaps are communicated with the sludge hopper.

[0021] Preferably, the cleaning mechanism comprises an electric push rod, an annular plugging plate and an annular pulse flushing pipe, the annular plugging plate is fixedly connected at the movable rod body end of the electric push rod and the periphery of the upper surface of the annular plugging plate is provided with an electric push rod, the inside of the upper layer pipe, the middle layer pipe and the lower layer pipe is provided with a cleaning mechanism, the three annular plugging plates are vertically inserted at the top of the first inner pipe, the second inner pipe and the third inner pipe respectively for plugging the annular gaps, the three annular pulse flushing pipes are fixedly installed at 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 respectively, and the pulse nozzles on the three annular pulse flushing pipes are in the form of an annular array and correspond to the upper surfaces of the first filter layer, the second filter layer and the third filter layer respectively.

[0022] Preferably, the water outlets of the ion membrane electrolytic tank near the intermediate zone and the anode zone are communicated with the water inlets of the second cyclone through communication pipes, the water outlet of the ion membrane electrolytic tank near the cathode zone is communicated with the water inlet of the inclined plate sedimentation tank through a pipeline, and the inside of the upper layer filter pipe, the middle layer filter pipe and the lower layer filter pipe is installed with a differential pressure sensor.

[0023] Preferably, the pipelines for communicating the inclined plate sedimentation tank and the second cyclone with the water storage tank are fixedly installed with a pH tester, the water flowing out of the inclined plate sedimentation tank and the second cyclone can be detected for pH, and the pipeline for the water inlet of the ion membrane electrolytic tank is fixedly installed with a solenoid valve for controlling the flow rate of the water inside.

[0024] A process flow of an ion membrane electrochemical water treatment device, comprising the following steps:

[0025] I. The raw water enters the first cyclone for solid-liquid separation, and the separated water enters the multi-stage filter mechanism for filtration;

[0026] II. The filtered water enters the ion membrane electrolysis tank, and a certain amount of deionized water or dilute acid solution is injected as starting liquid (after normal operation, it completely relies on the water dissociation of the bipolar membrane to produce water without continuous external water addition), and the positive and negative electrodes are powered on. Under the action of the electric field, the bipolar membrane starts to dissociate water, and H ﹢ Only through the bipolar membrane into the intermediate zone, OH ﹣ Neutralization, maintain a neutral environment; OH ﹣ Enter the anode zone to neutralize acidic water and inhibit Cl2 generation;

[0027] Reduction reaction occurs in the cathode zone, which increases the internal pH value, and the cations in the intermediate zone migrate to the cathode zone through the cation membrane. The cations in the cathode zone are reduced or precipitated, and the effluent from the cathode zone flows into the inclined plate sedimentation tank for precipitation;

[0028] III. The effluent from the anode zone and the intermediate zone enters the second cyclone, which can neutralize each other to form water close to neutral pH, and neutralizing agents can also be added to adjust the pH, and then filtered again through the second cyclone;

[0029] IV. The effluent in the cathode zone enters the inclined plate sedimentation tank, which precipitates and filters the effluent in the cathode zone, and neutralizing agents can also be added to the inclined plate sedimentation tank to neutralize the water inside, reducing the alkalinity of the water inside;

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

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

[0032] The above technical solution has the following advantages:

[0033] The ion membrane electrochemical water treatment device can realize step-by-step separation of suspended solids through the cooperation of the first cyclone and the multi-stage filtration mechanism, reduce the risk of subsequent ion membrane pollution, ensure that the ion membrane electrolysis tank can be used for a long time, and through the cleaning mechanism, the multi-stage filtration mechanism can be cleaned, avoiding frequent replacement of filter cartridges, while improving the processing efficiency, realizing the functions of efficient pretreatment and solid-liquid separation; and at the same time, the bipolar membrane and the cation membrane are used, the H ﹢ generated by the dissociation of water in the bipolar membrane is injected into the intermediate zone to neutralize OH ﹣ , maintain a neutral environment, and the generated OH ﹣The acidic wastewater enters the anode zone to neutralize it, making the pH of the treated water closer to neutral and maintaining pH self-balance. The filtrate from the first hydrocyclone, multi-stage filtration mechanism, inclined plate sedimentation tank, and second hydrocyclone is returned to the multi-stage filtration mechanism for reprocessing, effectively avoiding water waste and preventing the filtrate from polluting the environment, making it more convenient for wastewater treatment. Attached Figure Description

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

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

[0036] Figure 3 This is a schematic diagram of the ion-exchange membrane electrolyzer of the present invention;

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

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

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

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

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

[0042] Figure 9 For the present invention Figure 8 A schematic diagram of the explosion state;

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

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

[0045] In the diagram: 1. First hydrocyclone; 2. Multi-stage filtration mechanism; 3. Ion-exchange membrane electrolysis tank; 301. Positive electrode; 302. Negative electrode; 303. Bipolar membrane; 304. Cation membrane; 305. Anode region; 306. Intermediate region; 307. Cathode region; 4. Inclined plate sedimentation tank; 5. Second hydrocyclone; 6. Water storage tank; 7. Filter press; 8. Upper filter tube; 801. Upper tube; 802. First inner tube; 803. First filter layer; 9. Middle filter tube; 901. Middle tube; 902. 903. Second inner tube; 904. First upper ring tube; 905. Second filter layer; 10. Lower filter tube; 1006. Lower tube; 1007. Third inner tube; 1008. Second upper ring tube; 1009. Third filter layer; 10000. Outlet pipe; 10001. Sludge hopper; 11. Conical guide plate; 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

[0046] The foregoing and other technical contents, features and effects of the present invention are described in conjunction with the appendix below. Figures 1 to 11 As will be clearly shown in the detailed description of the embodiments, all structural contents mentioned in the following embodiments are based on the accompanying drawings.

[0047] This embodiment provides an ion-exchange membrane electrochemical water treatment device and its process flow, as shown in the attached figure. Figures 1-11 As shown, it includes a first hydrocyclone 1, which is used for preliminary solid-liquid separation of raw water. Industrial wastewater and other wastewater first enter the first hydrocyclone 1 from the inlet end of the first hydrocyclone 1. The wastewater rotates in the first hydrocyclone 1, and the particulate matter in the wastewater is separated by centrifugal force, causing it to settle at the bottom. The water that has undergone preliminary filtration is discharged from the drain outlet in the middle of the first hydrocyclone 1 and enters the multi-stage filtration mechanism 2.

[0048] The multi-stage filtration mechanism 2 is connected to the outlet of the first hydrocyclone 1 and is used to perform multi-stage filtration on the separated water. The multi-stage filtration mechanism includes an upper filter tube 8, a middle filter tube 9, and a lower filter tube 10. The upper filter tube 8 includes an upper tube 801, a first inner tube 802, and a first filter layer 803. The first inner tube 802 is fixedly connected inside the upper tube 801, and the first filter layer 803 is horizontally fixedly connected inside the first inner tube 802. The first filter layer 803 is a quartz sand filter plate, which can filter impurity particles with an accuracy of about 20-50μm. It mainly intercepts suspended solids, silt, and large particulate impurities. The top of the upper tube 801 is connected to the first hydrocyclone 1 through a pipe.

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

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

[0051] The bottom of the outer side of the first upper ring pipe 903 and the second upper ring pipe 1003 is fixedly connected with a conical guide plate 11, the top end of the first upper ring pipe 903 abuts against the bottom of the first inner pipe 802, and the top end of the second upper ring pipe 1003 abuts against the bottom of the second inner pipe 902, which can ensure the sealing between the two; annular gaps 12 are arranged between the upper layer pipe 801 and the first inner pipe 802, between the middle layer pipe 901 and the second inner pipe 902 and the first upper ring pipe 903, and between the lower layer pipe 1001 and the third inner pipe 1002 and the second upper ring pipe 1003, the annular gaps 12 are communicated with the sludge hopper 1006, the impurities filtered on the first filter layer 803, the second filter layer 904 and the third filter layer 1004 can be flushed into the annular gaps 12 by the cleaning mechanism, and then flow into the sludge hopper 1006 at the bottom from the annular gaps 12, which facilitates the flushing of the first filter layer 803, the second filter layer 904 and the third filter layer 1004, thereby prolonging the service life thereof.

[0052] And the inside of the multi-stage filtering mechanism 2 is provided with a cleaning mechanism capable of cleaning the filter core, the cleaning mechanism comprising 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 movable rod body end of the electric push rod 13 and four electric push rods 13 are arranged around the upper surface of the annular blocking plate 14, the inside of the upper layer pipe 801, the middle layer pipe 901 and the lower layer pipe 1001 is provided with the cleaning mechanism, the three annular blocking plates 14 are respectively vertically inserted into the top end 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 in the first cyclone 1 only flows in the first inner pipe 802, the second inner pipe 902 and the third inner pipe 1002, and the water flow passes through the first filter layer 803, the second filter layer 904 and the third filter layer 1004 in sequence, 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 are respectively corresponded 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 annular array, the pulse nozzles are inclined by 30°-60°, ensuring 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 in communication with the external pipeline, the electric push rod 13 can drive the annular blocking plate 14 to move upward, when the first filter layer 803, the second filter layer 904 and the third filter layer 1004 need to be cleaned, first close the pipeline at the top of the upper layer filtering pipe 8 to cut off the water flow, so that the multi-stage filtering mechanism 2 temporarily stops working, then the annular blocking plate 14 is lifted by the electric push rod 13, the pulse nozzles on the three annular pulse flushing pipes 15 are reversely injected with high-pressure gas-water mixed flow (0.5-1.0 MPa) from the outside of the filter core through the external pipeline, the impurities attached to the filter material are washed away from the surface, and the impurities are washed from the four sides of the first filter layer 803, the second filter layer 904 and the third filter layer 1004 into the annular gap 12 and discharged into the filter press 7 from the sludge hopper 1006.

[0053] The ion exchange membrane electrolysis tank 3 is connected with the water outlet of the multi-stage filtering mechanism 2, and the positive electrode 301 and the negative electrode 302 are arranged on the two sides in the ion exchange membrane electrolysis tank 3 respectively. The bipolar membrane 303 is arranged near the positive electrode side in the ion exchange membrane electrolysis tank 3, and a plurality of cation membranes 304 are arranged in parallel near the negative electrode side, so that the anode area 305, the intermediate area 306 and the cathode area 307 are formed in the ion exchange membrane electrolysis tank 3. The bipolar membrane 303 is arranged near the positive electrode 301 in the ion exchange membrane electrolysis tank 3, and separates the anode area 305 and the intermediate area 306. The plurality of cation membranes 304 are arranged in parallel on one side of the bipolar membrane 303 near the negative electrode 302 and have equal spacing, and separate the intermediate area 306 and the cathode area 307. The areas in the intermediate area 306 separated by the plurality of cation membranes 304 can be connected to each other through the communication elbow pipe outside the ion exchange membrane electrolysis tank 3, so that the water body can enter all areas in the intermediate area 306, and the circulation of the water body is ensured.

[0054] The anion exchange layer of the bipolar membrane 303 faces the anode area 305, and the cation exchange layer faces the intermediate area 306. The cation membrane 304 allows the passage of cations and blocks anions, so that the common cations (such as Na ﹢ , Ca 2﹢ ) between the bipolar membrane 303 and the cation membrane 304 and the plurality of cation membranes 304 in the intermediate area 306 can migrate to the cathode area 307 under the driving of an electric field, but cannot return in reverse due to the blocking of the bipolar membrane 303, so that the cations are enriched in the cathode area 307 in a directional manner, and subsequent reduction (such as Cu 2﹢ → Cu↓) or precipitation recovery is facilitated.

[0055] The H ﹢ generated by the bipolar membrane 303 can only enter the intermediate area 306 through the bipolar membrane 303, and neutralize the OH ﹣ in the intermediate area 306, so as to maintain a neutral environment, prevent CaCO3 and other salts from scaling, and improve the cation migration efficiency. The OH ﹣ enters the anode area 305 to neutralize the acidic water and inhibit the generation of Cl2.

[0056] The inclined plate sedimentation tank 4 is connected with the water outlet of the cathode area 307. After the water containing a large amount of cations in the cathode area 307 in the ion exchange membrane electrolysis tank 3 enters the inclined plate sedimentation tank 4, a chemical reaction with anions or addition of a flocculating agent into the inclined plate sedimentation tank 4 can make most of the cations precipitate, neutralize the pH value, avoid the pH value of the water body being too high, and the precipitate can be discharged into the filter press 7 through the bottom pipe.

[0057] The second cyclone 5 is connected with the water outlets of the anode area 305 and the intermediate area 306, and is used for acid-base neutralization and secondary filtration; the ion-exchange membrane electrolysis tank 3 is communicated with the water inlet of the second cyclone 5 through a communication pipe 16 close to the water outlets of the intermediate area 306 and the anode area 305, the water in the intermediate area 306 is filtered again through the second cyclone 5, and a pH sensor and an automatic adding device can be installed outside the second cyclone 5, so that the pH value of the water in the second cyclone 5 can be detected and the neutralizing agent can be automatically added according to the pH value to neutralize the pH value of the water; the ion-exchange membrane electrolysis tank 3 is communicated with the water inlet of the inclined plate sedimentation tank 4 through a pipe close to the water outlet of the cathode area 307, differential pressure sensors 19 are installed in the interiors of the upper layer filter pipe 8, the middle layer filter pipe 9 and the lower layer filter pipe 10, the differential pressure sensors 19 can detect the pressure difference between the upper layer filter pipe 8, the middle layer filter pipe 9 and the lower layer filter pipe 10 respectively, when the pressure difference is large, it proves that the corresponding filter core is seriously blocked, and the filtering effect of the water is poor, so the cleaning mechanism can be controlled by the control unit to clean the first filter layer 803, the second filter layer 904 and the third filter layer 1004;

[0058] When the differential pressure sensor 19 detects that the pressure difference is large, the cleaning mechanism is triggered, the pipe at the top of the upper layer filter pipe 8 is closed, the annular sealing plate 14 is lifted by the electric push rod 13, the pulse nozzles on the three annular pulse flushing pipes 15 are made to spray high-pressure gas-water mixed flow (0.5-1.0 MPa) from the outside of the filter core in the reverse direction through the external pipeline, the high-pressure gas-water mixed flow penetrates the pores of the filter material, the attached impurities are washed away from the surface, and the impurities are washed from the periphery of the first filter layer 803, the second filter layer 904 and the third filter layer 1004 into the annular gap 12 and then gathered in the sludge hopper 1006, and a liquid level sensor can be arranged in the sludge hopper 1006, when the sludge hopper 1006 stores a large amount of sludge water, the bottom pipe is opened to transport the sludge to the filter press 7.

[0059] The water storage tank 6 is connected with the water outlets of the inclined plate sedimentation tank 4 and the second cyclone 5 respectively, the pipes through which the inclined plate sedimentation tank 4 and the second cyclone 5 are communicated with the water storage tank 6 are fixedly installed with PH detectors 17, the pH values of the water flowing out of the inclined plate sedimentation tank 4 and the second cyclone 5 can be detected, when it is detected that the pH values of the water flowing out of the inclined plate sedimentation tank 4 or the second cyclone 5 are not neutral, the electrolysis voltage in the ion-exchange membrane electrolysis tank 3, the water circulation rate of the ion-exchange membrane electrolysis tank 3 or the adding amount of the flocculating agent and the neutralizing agent can be adjusted in time through control, so as to adjust the treatment effect of the water in time; the electromagnetic valve 18 for controlling the flow rate of the water in the ion-exchange membrane electrolysis tank 3 is fixedly installed on the pipe of the water inlet of the ion-exchange membrane electrolysis tank 3, so as to adjust the flow rate of the water and the electrolysis effect of the ion-exchange membrane electrolysis tank 3.

[0060] A filter press 7 connected with the discharge port of the first cyclone 1, the multi-stage filtering mechanism 2, the inclined plate sedimentation tank 4 and the second cyclone 5 is used for treating the precipitate, and the filtrate outlet of the filter press 7 is connected with the water inlet of the multi-stage filtering mechanism, forming a circulating treatment loop, the filter press 7 dehydrates and presses the impurity particles, the filter cake is discharged to the outside, and the filtrate is transported to the water inlet end of the multi-stage filtering mechanism 2 to be treated again.

[0061] A process flow of an ion membrane electrochemical water treatment device, comprising the following steps:

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

[0063] II. The filtered water enters the ion membrane electrolytic tank 3, and a certain amount of deionized water or dilute acid solution is injected as a starting liquid, and after normal operation, the water produced by the water dissociation of the bipolar membrane 303 is completely relied on, without the need for continuous external water supply, and the positive electrode 301 and the negative electrode 302 are electrified, under the action of the electric field, the bipolar membrane 303 starts to dissociate water, and H ﹢ Only through the bipolar membrane 303 into the middle zone 306, and the OH ﹣ Neutralization, maintain a neutral environment; OH ﹣ Enter the anode zone 305 to neutralize the acidic water and inhibit the generation of Cl2;

[0064] The cathode zone undergoes a reduction reaction, the internal pH value is increased, the cations in the middle zone 306 migrate to the cathode zone 307 through the cation membrane 304, the cations in the cathode zone 307 are reduced or precipitated, and the effluent in the cathode zone 307 flows into the inclined plate sedimentation tank 4 for sedimentation;

[0065] III. The effluent in the anode zone 305 and the middle zone 306 enters the second cyclone 5, which can neutralize each other to form water close to neutral pH, and neutralizing agents can also be added to adjust the pH, and then the water is filtered again through the second cyclone 5;

[0066] IV. The effluent in the cathode zone 307 enters the inclined plate sedimentation tank 4, which is used for sedimentation and filtration of the effluent in the cathode zone, and neutralizing agents can also be added to the inclined plate sedimentation tank 4 to neutralize the water inside and reduce the alkalinity of the water inside;

[0067] V. The effluent of 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;

[0068] VI. The precipitate of the first cyclone 1, the multi-stage filtering mechanism 2, the inclined plate sedimentation tank 4 and the second cyclone 5 enters the filter press 7, the filter cake is pressed and transported outside, and the filtrate is returned to the first cyclone 1 for circulation treatment.

[0069] The above description is only for illustrating the present application, and it should be understood that the present application is not limited to the above examples, and various modifications in accordance with the idea of the present application are within the scope of the present application.

Claims

1. An ion membrane electrochemical water treatment device, characterized by, The utility model relates to a water treatment device, including: A first cyclone (1) is used for preliminary solid-liquid separation of raw water; A multi-stage filtering mechanism (2) is connected with the water outlet of the first cyclone (1) and is used for multi-stage filtration of the separated water, and a cleaning mechanism for cleaning the filter core is arranged in the multi-stage filtering mechanism (2); An ion membrane electrolysis tank (3) is connected with the water outlet of the multi-stage filtering mechanism (2), and the ion membrane electrolysis tank (3) is internally provided with a positive electrode (301) and a negative electrode (302) on both sides, respectively, a bipolar membrane (303) is arranged near the positive electrode side in the ion membrane electrolysis tank (3), and a plurality of cation 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 tank (3); the bipolar membrane (303) is arranged near the positive electrode (301) in the ion membrane electrolysis tank (3) and separates the anode area (305) from the intermediate area (306); the plurality of cation membranes (304) are arranged in parallel on one side of the bipolar membrane (303) near the negative electrode (302) and have equal spacing and separate the intermediate area (306) from the cathode area (307); the anion exchange layer of the bipolar membrane (303) faces the anode area (305), and the cation exchange layer faces the intermediate area (306); the cation membrane (304) allows the passage of cations and blocks the passage of anions; An inclined plate sedimentation tank (4) is connected with the water outlet of the cathode area (307); A second cyclone (5) is connected with the water outlets of the anode area (305) and the intermediate area (306) and is used for acid-base neutralization and secondary filtration; A water storage tank (6) is connected with the water outlets of the inclined plate sedimentation tank (4) and the second cyclone (5), respectively; A filter press (7) is connected with the discharge outlets of the first cyclone (1), the multi-stage filtering mechanism (2), the inclined plate sedimentation tank (4) and the second cyclone (5) and is used for treating sediments, and the filtrate outlet of the filter press (7) is connected with the water inlet of the multi-stage filtering mechanism, forming a circulating treatment loop.

2. An ion membrane electrochemical water treatment device according to claim 1, characterized in that The multi-stage filtering mechanism includes an upper filtering pipe (8), a middle filtering pipe (9) and a lower filtering pipe (10), the upper filtering pipe (8) comprises an upper pipe (801), a first inner pipe (802) and a first filtering layer (803), the first inner pipe (802) is fixedly connected in the inside of the upper pipe (801), and the first filtering layer (803) is horizontally fixedly connected in the inside of the first inner pipe (802), and the top of the upper pipe (801) is communicated with the first cyclone (1) through a pipeline.

3. An ion membrane electrochemical water treatment device according to claim 2, characterized in that The middle filtering pipe (9) comprises a middle pipe (901), a second inner pipe (902), a first upper ring pipe (903) and a second filtering layer (904), the middle pipe (901) is fixedly connected at the bottom end of the upper filtering pipe (8) through a flange, the first upper ring pipe (903) and the second inner pipe (902) are fixedly connected at the top end and the bottom end in the inside of the middle pipe (901), respectively, and the second filtering layer (904) is horizontally fixedly installed in the inside of the second inner pipe (902).

4. An ion membrane electrochemical water treatment device according to claim 3, characterized in that The lower layer filter pipe (10) comprises a lower layer pipe (1001), a third inner pipe (1002), a second upper ring pipe (1003), a third filter layer (1004), a water outlet pipe (1005) and a sludge hopper (1006), the lower layer pipe (1001) is fixedly connected at the bottom of the middle layer pipe (901) through a flange, the second upper ring pipe (1003) and the third inner pipe (1002) are fixedly connected at the top and the bottom of the inside of the lower layer pipe (1001) respectively, and the third filter layer (1004) is horizontally fixedly installed in the inside of the third inner pipe (1002), the water outlet pipe (1005) is fixedly connected at the bottom of the side of the third inner pipe (1002) and penetrates through the side of the lower layer pipe (1001), the sludge hopper (1006) is fixedly connected at the bottom of the lower layer pipe (1001), the bottom of the outside of the first upper ring pipe (903) and the second upper ring pipe (1003) is fixedly connected with a conical guide plate (11), annular gaps (12) are formed between the upper layer pipe (801) and the first inner pipe (802), between the middle layer pipe (901) and the second inner pipe (902) and the first upper ring pipe (903), and between the lower layer pipe (1001) and the third inner pipe (1002) and the second upper ring pipe (1003), and the annular gaps (12) are communicated with the sludge hopper (1006).

5. An ion membrane electrochemical water treatment device according to claim 4, characterized in that The cleaning mechanism comprises 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 at the movable rod body end of the electric push rod (13), and the periphery of the upper surface of the annular sealing plate (14) is provided with the electric push rod (13), the inside of the upper layer pipe (801), the middle layer pipe (901) and the lower layer pipe (1001) is provided with the cleaning mechanism, the three annular sealing plates (14) are vertically inserted at the top of the first inner pipe (802), the second inner pipe (902) and the third inner pipe (1002) respectively, for sealing the annular gaps (12), the three annular pulse flushing pipes (15) are fixedly installed at 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) respectively, and the pulse nozzles on the three annular pulse flushing pipes (15) are in the form of an annular array and correspond to the upper surfaces of the first filter layer (803), the second filter layer (904) and the third filter layer (1004) respectively.

6. An ion membrane electrochemical water treatment device according to claim 5, characterized in that The water outlet of the ion membrane electrolytic tank (3) close to the middle zone (306) and the anode zone (305) is communicated with the water inlet of the second cyclone (5) through a communication pipe (16), the water outlet of the ion membrane electrolytic tank (3) close to the cathode zone (307) is communicated with the water inlet of the inclined plate sedimentation tank (4) through a pipeline, and the inside of the upper layer filter pipe (8), the middle layer filter pipe (9) and the lower layer filter pipe (10) is installed with a differential pressure sensor (19).

7. An ion membrane electrochemical water treatment device according to claim 6, characterised in that The inclined plate sedimentation tank (4) and the second cyclone (5) are fixedly installed with PH detectors (17) on the pipelines communicating with the water storage tank (6), which can detect the PH of the water flowing out of the inclined plate sedimentation tank (4) and the second cyclone (5).

8. A process flow based on the ion membrane electrochemical water treatment device according to any one of claims 1 to 7, characterized in that, The method comprises the following steps: Step I: raw water enters the first cyclone (1) for solid-liquid separation, and the separated water enters the multi-stage filtering mechanism (2) for filtration; II. The filtered water enters the ion membrane electrolytic tank (3), and a certain amount of deionized water or dilute acid solution is injected as starting liquid (after normal operation, it completely relies on the water dissociation self-produced water of the bipolar membrane (303), without continuous external water addition). The positive electrode (301) and the negative electrode (302) are electrified. Under the action of the electric field, the bipolar membrane (303) starts to perform water dissociation, and H ﹢ Only through the bipolar membrane (303) into the middle zone (306), and the OH ﹣ Neutralize the OH ﹣ Enter the anode zone (305) to neutralize the acidic water and inhibit the generation of Cl2; The cathode zone generates a reduction reaction, so that the internal PH value is increased, and the cations in the intermediate zone (306) migrate to the cathode zone (307) through the cation membrane (304), the cations in the cathode zone (307) are reduced or precipitated, and the effluent in the cathode zone (307) flows into the inclined plate sedimentation tank (4) for sedimentation; Step III: the effluent in the anode zone (305) and the intermediate zone (306) enters the second cyclone (5), which can neutralize each other to form water with a neutral pH value, and neutralizing agents can be added to adjust the pH value, and then the water is filtered again through the second cyclone (5); Step IV: the effluent in the cathode zone (307) enters the inclined plate sedimentation tank (4), which performs sedimentation and filtration on the effluent in the cathode zone, and neutralizing agents can be added to the inclined plate sedimentation tank (4) to neutralize the water therein and reduce the alkalinity of the water; Step V: the effluent in 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; Step VI: the sediments in the first cyclone (1), the multi-stage filtering mechanism (2), the inclined plate sedimentation tank (4) and the second cyclone (5) enter the filter press (7), the filter cake is pressed into blocks and then is transported out, and the filtrate is returned to the first cyclone (1) for recycling.

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