Electrodialysis device for strong brine treatment

Abstract

The utility model provides an electrodialysis device for strong brine treatment, which comprises an impurity removal unit for removing solids in strong brine entering the impurity removal unit; a permeable anode plate and a permeable cathode plate are oppositely arranged in the electroosmosis box, a plurality of cation exchange membranes and anion exchange membranes are arranged between the permeable anode plate and the permeable cathode plate in a staggered mode, and a plurality of concentrated water chambers and a plurality of fresh water chambers are formed between the cation exchange membranes and the inner wall of the electroosmosis box and between the anion exchange membranes and the inner wall of the electroosmosis box. The top of each concentrated water chamber and the top of each fresh water chamber are communicated with a first pipeline, the top ends of the multiple first pipelines are communicated with a second pipeline, and the end, away from the first pipeline, of the second pipeline is communicated with a concentrated brine outlet of the impurity removal unit; and the descaling assembly is arranged on the electroosmosis box and is used for removing sediments on the permeable cathode plate. According to the water-permeable cathode plate, the water permeability and the electrolysis performance of the water-permeable cathode plate are ensured, and the separation efficiency of ions such as Ca < 2 + > and Mg < 2 + > in strong brine is improved.

Description

Technical Field

[0001] The present application relates to the technical field of electrodialysis, and in particular to an electrodialysis device for treating concentrated brine. Background Art

[0002] Brine is a high-concentration wastewater generated in the industrial production process. It is characterized by complex water quality, high toxicity and difficulty in treatment. It is generally treated with electrodialysis desalination equipment to make it meet the water quality standards of reused water. Electrodialysis is a process under the action of a DC electric field that utilizes the selective permeability of ion exchange membranes to allow charged ions to migrate directionally through ion exchange membranes and be separated from aqueous solutions and other uncharged components, thereby achieving the purpose of concentrating, desalinating, refining and purifying the solution.

[0003] However, during the use of existing electrodialysis desalination equipment, Ca in concentrated brine 2+ Mg 2+ The positive ions will ionize with the cathode plate to produce OH - Negative ions react to generate Ca(OH)2, Mg(OH)2 and other precipitates that adhere to the cathode plate, causing blockage of the cathode plate, which in turn affects the water permeability and electrolysis performance of the cathode plate, thereby reducing the treatment efficiency of concentrated brine. Utility Model Content

[0004] The present application provides an electrodialysis device for treating concentrated brine, which is used to solve the technical problems described in the above background technology.

[0005] In order to solve the above technical problems, this application adopts the following technical solutions:

[0006] The present application provides an electrodialysis device for treating concentrated brine, comprising:

[0007] An impurity removal unit is used to remove solids from the concentrated brine entering therein;

[0008] An electroosmotic box, wherein a permeable anode plate and a permeable cathode plate are arranged opposite to each other in the electroosmotic box, a plurality of cation exchange membranes and anion exchange membranes are arranged alternately between the permeable anode plate and the permeable cathode plate, a plurality of concentrated water chambers and a plurality of fresh water chambers are formed between the plurality of cation exchange membranes, the plurality of anion exchange membranes and the inner wall of the electroosmotic box, the top of each of the concentrated water chambers and each of the fresh water chambers is connected to a first pipe, the tops of the plurality of the first pipes are connected to a second pipe, and one end of the second pipe away from the first pipe is connected to a concentrated brine outlet of the impurity removal unit;

[0009] A descaling assembly is arranged on the electroosmotic box and is used to remove sediment on the permeable cathode plate.

[0010] Optionally, the descaling assembly includes an H-shaped pipe and a third pipe;

[0011] The H-shaped pipeline is horizontally arranged on the outer top of the electroosmosis box, and the two parallel pipelines on it are symmetrical about the cathode plate. The two ends of the third pipeline are respectively connected to the middle part of the H-shaped pipeline and the acid storage tank. The two parallel pipelines on the H-shaped pipeline are evenly spaced and vertically connected to multiple fourth pipelines that penetrate and extend into the electroosmosis box. High-pressure nozzles are evenly spaced on each of the fourth pipelines.

[0012] Wherein, the ends of the H-shaped pipe are all blind ends.

[0013] Optionally, the water outlet of each of the high-pressure nozzles faces the permeable cathode plate.

[0014] Optionally, a high-pressure water pump is provided on the third pipeline;

[0015] The H-shaped pipeline is provided with flow regulating valves on the pipe bodies at both sides of the third pipeline.

[0016] Optionally, ultrasonic vibrators are respectively provided on two side walls of the permeable cathode plate perpendicular to the flow direction of the concentrated brine.

[0017] Optionally, the bottoms of the plurality of concentrated water chambers are all connected with a first branch pipe, the plurality of the first branch pipes are all connected with a first main pipe, and one end of the first main pipe away from the first branch pipe is used to connect with an electrolysis device;

[0018] The bottoms of the plurality of fresh water chambers are all connected with a second branch pipe, the plurality of the second branch pipes are all connected with a second main pipe, and one end of the second main pipe away from the second branch pipe is connected with a water storage tank.

[0019] Optionally, the impurity removal unit includes an impurity removal box, a filter screen and a plurality of activated carbon layers;

[0020] The impurity removal box is provided with a concentrated brine outlet, which is connected to the end of the second pipe away from the first pipe. The impurity removal box is connected with a water inlet pipe, which is arranged opposite to the concentrated brine outlet on the impurity removal box. The filter is connected to the water inlet pipe through a flange, and a plurality of activated carbon layers are arranged at intervals in the impurity removal box.

[0021] The electrodialysis device for treating concentrated brine provided by the present application first removes solids in the concentrated brine through an impurity removal unit, and then passes the concentrated brine without solids into an electrodialysis box, thereby avoiding blockage of the cation exchange membrane and the anion exchange membrane in the electrodialysis box by solids, ensuring the permeability of the cation exchange membrane and the anion exchange membrane, and simultaneously passing the concentrated brine into multiple concentrated water chambers and multiple fresh water chambers formed between multiple cation exchange membranes, multiple anion exchange membranes and the inner wall of the electrodialysis box through multiple first pipelines, and performing electrodialysis treatment on the concentrated brine entering each concentrated water chamber through the cation exchange membrane and the anion exchange membrane on both sides of each concentrated water chamber, and performing electrodialysis treatment on the concentrated brine entering each fresh water chamber through the cation exchange membrane and the anion exchange membrane on both sides of each fresh water chamber, thereby improving the treatment amount and treatment efficiency of the concentrated brine at the same time, and then removing the precipitation formed on the permeable cathode plate through the descaling ions, avoiding blockage of the permeable cathode plate, thereby ensuring the permeability and electrolysis performance of the permeable cathode plate, so that the permeable cathode plate can undergo electrolysis reaction normally and electrolyze OH - The Ca in the brine 2+ Mg 2+ etc. migrate to the permeable cathode plate, thereby increasing the Ca 2+ Mg 2+ The separation efficiency of plasma. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0023] Figure 1 A schematic diagram of the structure of an electrodialysis device for treating concentrated brine provided in one embodiment of the present application;

[0024] Figure 2 A schematic diagram of the structure of an impurity removal unit provided in one embodiment of the present application;

[0025] Figure 3 A schematic diagram of the internal structure of an electroosmosis box provided in one embodiment of the present application;

[0026] Figure 4 A schematic diagram of the structure of a descaling component provided in one embodiment of the present application.

[0027] In the figure: 100, impurity removal unit; 101, impurity removal box; 1011, concentrated brine outlet; 1012, water inlet pipe; 102, filter screen; 103, activated carbon layer; 200, electroosmosis box; 201, permeable anode plate; 202, permeable cathode plate; 2021, ultrasonic vibrator; 203, cation exchange membrane; 204, anion exchange membrane; 300, concentrated water chamber; 301, first pipeline; 302, first branch pipe; 400, fresh water chamber; 401, second branch pipe; 500, second pipeline; 600, descaling component; 601, H-type pipeline; 6011, flow control valve; 602, third pipeline; 6021, acid storage tank; 6022, high-pressure water pump; 700, fourth pipeline; 701, high-pressure nozzle; 800, first main pipe; 801, electrolysis device; 900, second main pipe; 901, water storage tank. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application is clearly and completely described below. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work also fall within the scope of protection of the present application.

[0029] refer to Figures 1 to 4 The present application provides an electrodialysis device for treating concentrated brine, comprising:

[0030] The impurity removal unit 100 is used to remove solids in the concentrated brine entering therein; wherein the solids may be insoluble substances such as suspended matter and precipitates.

[0031] An electroosmotic box 200 is provided, wherein a permeable anode plate 201 and a permeable cathode plate 202 are arranged opposite to each other in the electroosmotic box 200, a plurality of cation exchange membranes 203 and anion exchange membranes 204 are arranged alternately between the permeable anode plate 201 and the permeable cathode plate 202, a plurality of concentrated water chambers 300 and a plurality of desalinated water chambers 400 are formed between the plurality of cation exchange membranes 203, the plurality of anion exchange membranes 204 and the inner wall of the electroosmotic box 200, the top of each concentrated water chamber 300 and each desalinated water chamber 400 is connected to a first pipe 301, the tops of the plurality of first pipes 301 are connected to a second pipe 500, and the end of the second pipe 500 away from the first pipe 301 is connected to a concentrated brine outlet 1011 of the impurity removal unit 100; wherein the permeable anode plate 201 and the permeable cathode plate 202 are both connected to a power source, an oxidation reaction occurs on the permeable anode plate 201 and H is electrolyzed + , so that the Cl in the brine - The permeable cathode plate 202 undergoes a reduction reaction and electrolyzes OH -ions, making the OH in the concentrated brine - Migrate to the permeable anode plate 201, so as to realize the Cl - With Ca 2+ Mg 2+ The separation of etc. makes the concentrated brine purified.

[0032] The descaling assembly 600 is arranged on the electroosmotic box 200 and is used to remove the sediment on the permeable cathode plate 202, so as to avoid the blockage of the permeable cathode plate 202, thereby ensuring the permeability and electrolysis performance of the permeable cathode plate 202, so that the permeable cathode plate 202 can normally undergo electrolysis reaction and electrolyze OH - , so that the Ca in the brine 2+ Mg 2+ etc. migrate to the permeable cathode plate 202, thereby increasing the Ca 2+ Mg 2+ The separation efficiency of plasma.

[0033] The electrodialysis device for treating concentrated brine provided by the present application first removes solids in the concentrated brine through the impurity removal unit 100, and then passes the concentrated brine without solids into the electrodialysis box 200, thereby preventing the solids from clogging the cation exchange membrane 203 and the anion exchange membrane 204 in the electrodialysis box 200, thereby ensuring the permeability of the cation exchange membrane 203 and the anion exchange membrane 204, and simultaneously passing the concentrated brine into the multiple concentrated water chambers 300 and the multiple fresh water chambers 400 formed between the multiple cation exchange membranes 203, the multiple anion exchange membranes 204 and the inner wall of the electrodialysis box 200 through the multiple first pipes 301, and passing the concentrated brine through each concentrated water chamber 30 The cation exchange membrane 203 and the anion exchange membrane 204 on both sides of the 0 perform electrodialysis treatment on the concentrated brine entering each concentrated water chamber 300, and the cation exchange membrane 203 and the anion exchange membrane 204 on both sides of each fresh water chamber 400 perform electrodialysis treatment on the concentrated brine entering each fresh water chamber 400, thereby improving the treatment capacity and treatment efficiency of the concentrated brine at the same time, and then removing the precipitation formed on the permeable cathode plate 202 by the descaling ions, avoiding the blockage of the permeable cathode plate 202, thereby ensuring the water permeability and electrolysis performance of the permeable cathode plate 202, so that the permeable cathode plate 202 can normally undergo electrolysis reaction and electrolyze OH - The Ca in the brine 2+ Mg 2+ etc. migrate to the permeable cathode plate 202, thereby increasing the Ca 2+ Mg 2+ The separation efficiency of plasma.

[0034] In some embodiments, reference Figure 1 and Figure 4The descaling component 600 in the present application includes an H-shaped pipe 601 and a third pipe 602; specifically, the H-shaped pipe 601 is horizontally arranged on the outer top of the electroosmosis box 200 and the two parallel pipes thereon are symmetrical about the permeable cathode plate 202, and the two ends of the third pipe 602 are respectively connected to the middle part of the H-shaped pipe 601 and the acid storage tank 6021, and the two parallel pipes on the H-shaped pipe 601 are evenly spaced and vertically connected to multiple fourth pipes 700 that penetrate and extend into the electroosmosis box 200, and each fourth pipe 700 is evenly spaced and provided with high-pressure nozzles 701.

[0035] Among them, the ends of the H-shaped pipe 601 are all blind ends. Specifically, the purpose of the multiple fourth pipes 700 located on the same side of the permeable cathode plate 202 and the multiple high-pressure nozzles 701 connected to each fourth pipe 700 is to enable the acidic solution to be fully sprayed on the permeable cathode plate 202 and fully react with the sediment attached to the permeable cathode plate 202, so as to achieve effective cleaning of the sediment on the permeable cathode plate 202. Therefore, the number of the fourth pipes 700 and the number of high-pressure nozzles 701 connected to each fourth pipe 700 can be set according to the actual situation such as the size of the permeable cathode plate 202, and this application does not make specific restrictions on it.

[0036] In the above embodiment, the acid storage tank 6021 stores an acid solution of a certain concentration such as hydrochloric acid and sulfuric acid. The acid solution in the acid storage tank 6021 enters the plurality of fourth pipes 700 located on both sides of the permeable cathode plate 202 through the third pipe 602 and the H-shaped pipe 601 and is sprayed onto the permeable cathode plate 202 from the high-pressure nozzle 701 connected to the fourth pipe 700 and flows from top to bottom along the top of the permeable cathode plate 202. During the above process, the acid solution is in full contact with the precipitate (Ca(OH)2, Mg(OH)2, etc.) attached to the permeable cathode plate 202 and undergoes a neutralization reaction to generate a salt solution such as CaCl2 and MgCl2, thereby achieving the cleaning of the precipitate attached to the permeable cathode plate 202 and ensuring the permeability and electrolysis performance of the permeable cathode plate 202. In addition, the concentration of the acidic solution stored in the acid storage tank 6021 can be set according to actual needs, in order to ensure that it can efficiently react with the precipitates attached to the permeable cathode plate 202, so as to achieve the purpose of cleaning the precipitates attached to the permeable cathode plate 202. Therefore, the present application does not make specific limitations on the concentration of the acidic solution.

[0037] In some embodiments, the water outlet of each high-pressure nozzle 701 in the present application is directed toward the permeable cathode plate 202, so as to ensure that the acidic solution sprayed from each high-pressure nozzle 701 can be sprayed onto the permeable cathode plate 202 as much as possible and react with the precipitates attached to the permeable cathode plate 202 to neutralize, so that the precipitates attached to the permeable cathode plate 202 can be effectively removed, thereby improving the cleaning efficiency of the precipitates attached to the permeable cathode plate 202.

[0038] In some embodiments, reference Figure 4 In the present application, a high-pressure water pump 6022 is provided on the third pipeline 602, and the high-pressure water pump 6022 provides power for the acid solution in the acid storage tank 6021 to be sprayed onto the permeable cathode plate 202 in sequence through the third pipeline 602, the H-shaped pipeline 601, the fourth pipeline 700 and the high-pressure nozzle 701 on the fourth pipeline 700.

[0039] In addition, flow regulating valves 6011 are respectively provided on the pipe body of the H-shaped pipe 601 located on both sides of the third pipe 602, wherein the two flow regulating valves 6011 can increase the flow rate of the acidic solution sprayed through the H-shaped pipe 601, the fourth pipe 700 and the high-pressure nozzle 701, so that the sediment attached to the permeable cathode plate 202 can be effectively cleaned by an effective amount of acidic solution.

[0040] In some embodiments, reference Figure 4 In the present application, ultrasonic vibrators 2021 are respectively arranged on two side walls of the permeable cathode plate 202 perpendicular to the flow direction of the concentrated brine. The ultrasonic vibrators 2021 generate tiny bubbles through their high-frequency vibrations, and these bubbles generate strong impact and flushing forces when they burst instantly. The impact and flushing forces generated above can effectively remove the sediment attached to the permeable cathode plate 202.

[0041] In addition, in order to improve the removal efficiency of the sediment attached to both sides of the permeable cathode plate 202, a plurality of ultrasonic vibrators 2021 are evenly arranged on each side of the permeable cathode plate 202. Figure 1 In the present application, the bottoms of the multiple concentrated water chambers 300 are all connected to a first branch pipe 302, and the multiple first branch pipes 302 are all connected to a first main pipe 800. One end of the first main pipe 800 away from the first branch pipe 302 is used to connect to an electrolysis device 801; wherein, each first branch pipe 302 is provided with a first stop valve, and when the first stop valve is opened, the concentrated water in each concentrated water chamber 300 enters the electrolysis device 801 in turn through the first branch pipe 301 and the first main pipe 800, and the electrolysis device 801 electrolyzes the concentrated water entering therein and generates chlorine, and the chlorine can disinfect the water in the equipment, thereby obtaining non-toxic fresh water, thereby realizing the desalination treatment of the concentrated water.

[0042] In addition, the bottoms of the multiple fresh water chambers 400 are all connected to the second branch pipes 401, and the multiple second branch pipes 401 are all connected to the second main pipe 900, and the end of the second main pipe 900 away from the second branch pipe 401 is connected to the water storage tank 901. Among them, each second branch pipe 401 is provided with a second stop valve, and when the second stop valve is opened, the fresh water in each fresh water chamber 400 enters the water storage tank 901 through the second branch pipe 302 and the second main pipe 900 in turn, and the fresh water is recovered through the water storage tank 901, which is convenient for the reuse of fresh water.

[0043] In some embodiments, reference Figure 2 The impurity removal unit 100 in the present application includes an impurity removal box 101, a filter screen 102 and a plurality of activated carbon layers 103; specifically, a concentrated brine outlet 1011 is provided on the impurity removal box 101, and the concentrated brine outlet 1011 on the impurity removal box 101 is connected to an end of the second pipe 500 away from the first pipe 301, and a water inlet pipe 1012 is connected to the impurity removal box 101, and the water inlet pipe 1012 is arranged opposite to the concentrated brine outlet 1012 on the impurity removal box 101, and the filter screen 102 is connected to the water inlet pipe 1012 through a flange, and a plurality of activated carbon layers 103 are arranged in an electroosmosis box 200 at intervals. Among them, the filter screen 102 can be made of stainless steel, and the aperture of the mesh on the filter screen 102 can be set according to actual needs, the purpose is to filter out the solids in the concentrated brine so that it does not enter the impurity removal box 200, so this application does not specifically limit it here.

[0044] In the above embodiment, the concentrated brine enters the water inlet pipe 1012 through the end of the water inlet pipe 1012 away from the impurity removal box 101, and the solids in the concentrated brine are filtered out by the filter 102. The concentrated brine without solids enters the impurity removal box 101 and passes through the multiple activated carbon layers 103 in the impurity removal box 101 to adsorb organic matter, odor, pigments, residual drugs, heavy metals, chlorine and other pollutants in the concentrated brine, so as to remove organic matter, odor, pigments, residual drugs, heavy metals, chlorine and other pollutants in the concentrated brine, thereby achieving the purification efficiency of the concentrated brine.

[0045] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, ordinary technicians in the field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. An electrodialysis device for treating concentrated brine, characterized in that: include: An impurity removal unit (100) is used to remove solids from the concentrated brine entering therein; An electroosmosis box (200), wherein a permeable anode plate (201) and a permeable cathode plate (202) are arranged opposite to each other in the electroosmosis box (200), a plurality of cation exchange membranes (203) and anion exchange membranes (204) are alternately arranged between the permeable anode plate (201) and the permeable cathode plate (202), a plurality of concentrated water chambers (300) and a plurality of desalinated water chambers (400) are formed between the plurality of cation exchange membranes (203), the plurality of anion exchange membranes (204) and the inner wall of the electroosmosis box (200), the top of each of the concentrated water chambers (300) and each of the desalinated water chambers (400) is connected to a first pipe (301), the tops of the plurality of the first pipes (301) are connected to a second pipe (500), and one end of the second pipe (500) away from the first pipe (301) is connected to a concentrated brine outlet of the impurity removal unit (100); A descaling assembly (600) is arranged on the electroosmotic box (200) and is used to remove sediment on the permeable cathode plate (202).

2. The electrodialysis device for concentrated brine treatment according to claim 1, characterized in that: The descaling assembly (600) comprises an H-shaped pipe (601) and a third pipe (602); The H-shaped pipe (601) is horizontally arranged on the outer top of the electroosmosis box (200), and the two parallel pipes thereon are symmetrical about the permeable cathode plate (202), the two ends of the third pipe (602) are respectively connected to the middle of the H-shaped pipe (601) and the acid storage tank (6021), and the two parallel pipes on the H-shaped pipe (601) are evenly spaced vertically downwardly connected to a plurality of fourth pipes (700) that penetrate and extend into the electroosmosis box (200), and each of the fourth pipes (700) is evenly spaced and provided with high-pressure nozzles (701); Wherein, the ends of the H-shaped pipe (601) are all blind ends.

3. The electrodialysis device for concentrated brine treatment according to claim 2, characterized in that: The water outlet of each high-pressure nozzle (701) faces the permeable cathode plate (202).

4. The electrodialysis device for concentrated brine treatment according to claim 2, characterized in that: The third pipeline (602) is provided with a high-pressure water pump (6022); The H-shaped pipeline (601) is provided with flow regulating valves (6011) on the pipe body located on both sides of the third pipeline (602).

5. The electrodialysis device for treating concentrated brine according to claim 1, characterized in that: Ultrasonic vibrators (2021) are respectively arranged on two side walls of the permeable cathode plate (202) perpendicular to the flow direction of the concentrated brine.

6. The electrodialysis device for concentrated brine treatment according to claim 1, characterized in that: The bottoms of the plurality of concentrated water chambers (300) are all connected to a first branch pipe (302), the plurality of first branch pipes (302) are all connected to a first main pipe (800), and one end of the first main pipe (800) away from the first branch pipe (302) is used to connect to an electrolysis device (801); The bottoms of the plurality of fresh water chambers (400) are all connected to a second branch pipe (401), the plurality of the second branch pipes (401) are all connected to a second main pipe (900), and one end of the second main pipe (900) away from the second branch pipe (401) is connected to a water storage tank (901).

7. The electrodialysis device for treating concentrated brine according to any one of claims 1 to 6, characterized in that: The impurity removal unit (100) comprises an impurity removal box (101), a filter screen (102) and a plurality of activated carbon layers (103); The impurity removal box (101) is provided with a concentrated brine outlet (1011), the concentrated brine outlet on the impurity removal box (101) is connected to an end of the second pipe (500) away from the first pipe (301), the impurity removal box (101) is connected to a water inlet pipe (1012), the water inlet pipe (1012) is arranged opposite to the concentrated brine outlet (1011) on the impurity removal box (101), the filter screen (102) is connected to the water inlet pipe (1012) via a flange, and a plurality of activated carbon layers (103) are arranged at intervals in the impurity removal box (101).

Images