Ammonium nitrate wastewater electrodialysis device

Abstract

The utility model discloses an ammonium nitrate wastewater electrodialysis device, and particularly relates to the technical field of electrodialysis, the ammonium nitrate wastewater electrodialysis device comprises an insulation box body and an insulation top plate arranged at the top opening of the insulation box body, and a cation exchange membrane and an anion exchange membrane which are mutually staggered and inserted and are wavy are arranged in the middle of an inner cavity of the insulation box body; a fresh water chamber is formed between the cation exchange membrane and the anion exchange membrane, one end of an inner cavity of the insulating box body is provided with a wavy first pole membrane, a concentrated water chamber is formed between the first pole membrane and the cation exchange membrane, and the other end of the inner cavity of the insulating box body is provided with a wavy second pole membrane; a concentrated water chamber is formed between the second pole membrane and the anion exchange membrane, the first pole membrane and the second pole membrane respectively form a pole water chamber with the inner wall of the adjacent insulating box body, and an electrode mechanism is inserted into each of the two pole water chambers, so that the overall electrodialysis efficiency of the device is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of electrodialysis, and in particular relates to an ammonium nitrate wastewater electrodialysis device. Background Art

[0002] Industrially, the production of nitro-compound fertilizers generates large amounts of ammonium nitrate wastewater, which requires treatment before discharge. Currently, electrodialysis is commonly used to treat ammonium nitrate wastewater. However, existing electrodialysis equipment has low electrodialysis efficiency, which affects the wastewater treatment rate.

[0003] For example, the existing announcement number is CN117942769B, which is a bipolar membrane electrodialysis device, which "includes several water storage parts and connecting pipes, the water storage parts are provided with a water inlet and a water outlet, the water outlets include outlet 1 and outlet 2, the water storage parts are provided with cleaning parts near the left and right sides, the upper and lower ends of the water storage parts are provided with bidirectional screw rods that push the cleaning parts to move back and forth and can be reset, the upper end of the cleaning part is clamped with a gear, the water storage part is provided with a rack that meshes with the gear, and the rack cannot move, the water storage part is provided with a fixing part, the fixing part is clamped with a bipolar diaphragm, and the fixing part is provided with a restriction group for fixing the bipolar diaphragm". It is provided with a flat plate-shaped ion exchange membrane, the electrodialysis efficiency is low, which affects the wastewater treatment speed. Therefore, a new type of ammonium nitrate wastewater electrodialysis device is needed. Utility Model Content

[0004] In order to solve the above problems, the utility model discloses an ammonium nitrate wastewater electrodialysis device.

[0005] In order to achieve the above-mentioned purpose, the technical solution of the present utility model is as follows:

[0006] An ammonium nitrate wastewater electrodialysis device comprises an insulating box and an insulating top plate installed at the top opening of the insulating box. A cation exchange membrane and an anion exchange membrane that are staggered and inserted into each other and are wavy are installed in the middle of the inner cavity of the insulating box, and a fresh water chamber is formed between the cation exchange membrane and the anion exchange membrane. A wavy first pole membrane is installed at one end of the inner cavity of the insulating box, and a concentrated water chamber is formed between the first pole membrane and the cation exchange membrane. A wavy second pole membrane is installed at the other end of the inner cavity of the insulating box, and a concentrated water chamber is formed between the second pole membrane and the anion exchange membrane. The first pole membrane and the second pole membrane respectively form a pole water chamber with the adjacent inner wall of the insulating box, and an electrode mechanism is inserted into each of the two pole water chambers.

[0007] As an optimal technical solution of the present invention, the cation exchange membrane, anion exchange membrane, first pole membrane and second pole membrane are all fixedly connected to a corrugated plate at the top and bottom of themselves, and the two corrugated plates connected to the same membrane are commonly connected to a wedge-shaped frame, and the insulating box is provided with a contraction groove adapted to the wedge-shaped frame.

[0008] As a preferred technical solution of the present invention, the shrinkage groove gradually shrinks from top to bottom.

[0009] As a preferred technical solution of the present invention, the fresh water chamber, concentrated water chamber and polar water chamber are all provided with through holes communicating with the outside at both ends, and each through hole is connected to an external pipe.

[0010] As a preferred technical solution of the present invention, each of the electrode mechanisms includes: a T-shaped slot fixedly connected to the lower surface of the insulating top plate, and a conductive threaded column fixedly embedded in the insulating top plate, the T-shaped slot is slidably plugged with an electrode plate, the bottom of the conductive threaded column is connected to a conductive spring, the bottom of the conductive spring is connected to a telescopic conductive column slidably connected to the insulating top plate, and the bottom of the telescopic conductive column is pressed against the electrode plate.

[0011] As a preferred technical solution of the present invention, two exhaust pipes extend upward from the insulating top plate, and the two exhaust pipes are respectively connected to the two polar water chambers.

[0012] The beneficial effects of the utility model are:

[0013] First, the cation exchange membrane and the anion exchange membrane are interlaced and wavy, forming a fresh water chamber that bends back and forth. This increases the electrodialysis membrane area per unit volume, allowing more anions and cations to pass through the ion exchange membrane. The same applies to the wavy first and second membranes. Thanks to the electrodialysis membrane area per unit volume, the overall electrodialysis efficiency of the device is improved.

[0014] Second, because the wedge-shaped frame is inserted into the shrinkage groove from top to bottom, the connection between the wedge-shaped frame and the insulating box is squeezed and sealed under the downward pressure of the insulating top plate. The connection between the wedge-shaped frame and the insulating top plate is squeezed and sealed, so that the cation exchange membrane, anion exchange membrane, first pole membrane and second pole membrane can be pulled out and replaced after the insulating top plate is removed. Thanks to the downward pressure installation and sealing design, the maintenance convenience of the membrane structure is improved;

[0015] 3. During electrodialysis, the electrode plates will deposit to form a solid layer. By removing the insulating top plate, the electrode plates can be pulled out from the T-slots to clean the surface deposits on the electrode plates, ensuring the stability of the electric field of electrodialysis. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the utility model;

[0017] Figure 2 Structural schematic diagram of the electrode mechanism and the insulating top plate in the embodiment of the present utility model;

[0018] Figure 3 Cross-sectional view of the electrode mechanism and the insulating top plate in the embodiment of the present utility model;

[0019] Figure 4 In the embodiment of the present utility model Figure 3 Enlarged view of part A;

[0020] Figure 5 Structural schematic diagram of the insulating box body, cation exchange membrane, anion exchange membrane, first bipolar membrane, second bipolar membrane, corrugated plate and wedge-shaped frame in the embodiment of the present utility model;

[0021] Figure 6 Structural schematic diagram of the cation exchange membrane, corrugated plate and wedge-shaped frame in the embodiment of the present utility model;

[0022] Figure 7 Structural schematic diagram of the insulating box body in the embodiment of the present utility model.

[0023] List of attached drawing reference signs:

[0024] 1. Insulating box body; 101. Shrinkage groove;

[0025] 2. Cation exchange membrane; 3. Anion exchange membrane; 4. First bipolar membrane; 5. Second bipolar membrane; 6. Corrugated plate; 7. Wedge-shaped frame;

[0026] 8. Electrode mechanism; 801. Electrode plate; 802. T-shaped slot; 803. Telescopic conductive column; 804. Conductive spring; 805. Conductive threaded column;

[0027] 9. Insulating top plate; 901. Exhaust pipe;

[0028] 10. Fresh water chamber; 11. Concentrated water chamber; 12. Bipolar water chamber; 13. External connection pipe. Detailed implementation manners

[0029] The present utility model will be further clarified below in conjunction with the attached drawings and the detailed implementation manners. It should be understood that the following detailed implementation manners are only used to illustrate the present utility model and not to limit the scope of the present utility model.

[0030] Please refer to Figure 1-7, An ammonium nitrate wastewater electrodialysis device, including an insulating box body 1 and an insulating top plate 9 installed at the top opening of the insulating box body 1. The insulating box body 1 and the insulating top plate 9 are fixedly connected together by a plurality of bolts and nuts. In the middle of the inner cavity of the insulating box body 1, there are interlaced and wave-shaped cation exchange membranes 2 and anion exchange membranes 3 installed, and a fresh water chamber 10 is formed between the cation exchange membrane 2 and the anion exchange membrane 3. The vast majority of the spacing between the cation exchange membrane 2 and the anion exchange membrane 3 remains equal. At one end of the inner cavity of the insulating box body 1, there is a wave-shaped first polar membrane 4 installed, and a concentrated water chamber 11 is formed between the first polar membrane 4 and the cation exchange membrane 2. At the other end of the inner cavity of the insulating box body 1, there is a wave-shaped second polar membrane 5 installed, and a concentrated water chamber 11 is formed between the second polar membrane 5 and the anion exchange membrane 3. During electrodialysis, only the cations in the fresh water chamber 10 can pass through the cation exchange membrane 2 and enter the adjacent concentrated water chamber 11, and the anions in the adjacent concentrated water chamber 11 cannot pass through the cation exchange membrane 2 and enter the fresh water chamber 10. During electrodialysis, only the anions in the fresh water chamber 10 can pass through the anion exchange membrane 3 and enter the adjacent concentrated water chamber 11, and the cations in the adjacent concentrated water chamber 11 cannot pass through the anion exchange membrane 3 and enter the fresh water chamber 10. The first polar membrane 4 and the second polar membrane 5 respectively form a polar water chamber 12 with the inner wall of the adjacent insulating box body 1, and an electrode mechanism 8 is inserted into each of the two polar water chambers 12. One of the electrode mechanisms 8 is the anode, and one of the electrode mechanisms 8 is the cathode, as Figure 5 indicated by the symbols in. During electrodialysis, the hydrogen ions in the polar water chamber 12 of the anode pass through and enter the second polar membrane 5 and then enter the adjacent concentrated water chamber 11, and the anions in the adjacent concentrated water chamber 11 cannot pass through the second polar membrane 5 and enter the polar water chamber 12 of the anode. During electrodialysis, the hydroxide ions in the polar water chamber 12 of the cathode pass through and enter the first polar membrane 4 and then enter the adjacent concentrated water chamber 11, and the cations in the adjacent concentrated water chamber 11 cannot pass through the first polar membrane 4 and enter the polar water chamber 12 of the cathode.

[0031] Two exhaust pipes 901 extend upward from the insulating top plate 9, and the two exhaust pipes 901 are respectively communicated with the two polar water chambers 12. The exhaust pipes 901 are provided with external threads for connecting external pipelines. The exhaust pipe 901 communicated with the polar water chamber 12 where the anode is located is used to discharge the oxygen electrolyzed at the anode. The exhaust pipe 901 communicated with the polar water chamber 12 where the cathode is located is used to discharge the hydrogen electrolyzed at the cathode.

[0032] The cation exchange membrane 2, the anion exchange membrane 3, the first bipolar membrane 4 and the second bipolar membrane 5 are fixedly connected with a corrugated plate 6 at the top and bottom of themselves, and the two corrugated plates 6 connected to the same membrane are jointly connected with a wedge-shaped frame 7. The wedge-shaped frame 7 is made by hollowing out a wedge-shaped plate. The corrugated plate 6 is used to support the membrane structure. The insulating box body 1 is provided with a shrinkage groove 101 adapted to the wedge-shaped frame 7. The shrinkage groove 101 gradually shrinks from top to bottom. After the wedge-shaped frame 7 is inserted into the shrinkage groove 101 from top to bottom, under the pressing of the insulating top plate 9, the connection between the wedge-shaped frame 7 and the insulating box body 1 is squeezed and sealed, and the connection between the wedge-shaped frame 7 and the insulating top plate 9 is squeezed and sealed.

[0033] The fresh water chamber 10, the concentrated water chamber 11, and the electrode water chamber 12 are all provided with through holes communicating outward at both ends, and each through hole communicates with an external communication pipe 13. The external communication pipe 13 is provided with an external thread for connecting an external pipeline. The external communication pipe 13 at one end of the fresh water chamber 10 is introduced into the ammonium nitrate wastewater to be treated for electrodialysis, and the electrodialyzed fresh water is discharged from the external communication pipe 13 at the other end of the fresh water chamber 10. During electrodialysis, the cations and anions in the ammonium nitrate wastewater respectively pass through the cation exchange membrane 2 and the anion exchange membrane 3 and enter the two concentrated water chambers 11. The liquid in the concentrated water chamber 11 is recovered and utilized as a concentrated solution and flows out through the external communication pipe 13. The electrode water chamber 12 is introduced into circulating clean water through the external communication pipe 13.

[0034] Each electrode mechanism 8 includes: a T-shaped slot 802 fixedly connected to the lower surface of the insulating top plate 9, and a conductive threaded column 805 fixedly embedded in the insulating top plate 9. The T-shaped slot 802 is slidably inserted with an electrode plate 801, and the bottom of the conductive threaded column 805 is connected with a conductive spring 804. The bottom of the conductive spring 804 is connected with a telescopic conductive column 803 slidably connected to the insulating top plate 9, and the bottom of the telescopic conductive column 803 abuts against the electrode plate 801. The electrode plate 801 is made of pure titanium material with a purity of 99%.

[0035] The two conductive threaded columns 805 are respectively electrically connected to the positive and negative poles of an external power supply. After the electrode plate 801 is inserted into the T-shaped slot 802, the bottom of the telescopic conductive column 803 abuts against the electrode plate 801, so that the electrode plate 801 is electrically connected to the adjacent conductive threaded column 805.

[0036] Working principle:

[0037] During operation, the two electrode mechanisms 8 are respectively connected to the positive and negative electrodes of an external DC power supply for electrodialysis. The electrode mechanism 8 connected to the positive electrode of the power supply is the anode, and the electrode mechanism 8 connected to the negative electrode of the power supply is the cathode. Under the action of the external DC electric field, the ammonium nitrate wastewater in the desalination chamber 10 is desalinated by electrodialysis, wherein the cations and anions in the ammonium nitrate wastewater pass through the cation exchange membrane 2 and the anion exchange membrane 3 respectively and enter the two concentrated water chambers 11, so that the ion concentration in the concentrated water chamber 11 is increased, and the liquid in the concentrated water chamber 11 flows out through the external pipe 13 and is recycled as a concentrated liquid;

[0038] Among them, since the cation exchange membrane 2 and the anion exchange membrane 3 are interlaced and wavy, a fresh water chamber 10 that bends back and forth is formed, which increases the electrodialysis membrane area per unit volume and improves the efficiency of electrodialysis. The wavy first electrode membrane 4 and the second electrode membrane 5 also improve the efficiency of electrodialysis.

[0039] Among them, since the wedge-shaped frame 7 is inserted into the shrinkage groove 101 from top to bottom, under the downward pressure of the insulating top plate 9, the connection between the wedge-shaped frame 7 and the insulating box 1 is squeezed and sealed, and the connection between the wedge-shaped frame 7 and the insulating top plate 9 is squeezed and sealed, so that the cation exchange membrane 2, the anion exchange membrane 3, the first pole membrane 4 and the second pole membrane 5 can be pulled out and replaced after the insulating top plate 9 is removed;

[0040] The insulating top plate 9 is removed, and the electrode plate 801 can be pulled out from the T-shaped slot 802 for cleaning the surface deposits of the electrode plate 801 .

[0041] It should be noted that the above content only illustrates the technical idea of the utility model and cannot be used to limit the protection scope of the utility model. For ordinary technicians in this technical field, they can make several improvements and modifications without departing from the principles of the utility model. These improvements and modifications all fall within the protection scope of the claims of the utility model.

Claims

1. An ammonium nitrate wastewater electrodialysis device, comprising an insulating box body (1) and an insulating top plate (9) installed at the top opening of the insulating box body (1), characterized in that, In the middle of the inner cavity of the insulating box body (1), a wavy cation exchange membrane (2) and an anion exchange membrane (3) are installed in an interlaced and inserted manner, and a fresh water chamber (10) is formed between the cation exchange membrane (2) and the anion exchange membrane (3). At one end of the inner cavity of the insulating box body (1), a wavy first polar membrane (4) is installed, and a concentrated water chamber (11) is formed between the first polar membrane (4) and the cation exchange membrane (2). At the other end of the inner cavity of the insulating box body (1), a wavy second polar membrane (5) is installed, and a concentrated water chamber (11) is formed between the second polar membrane (5) and the anion exchange membrane (3). The first polar membrane (4) and the second polar membrane (5) respectively form a polar water chamber (12) with the inner wall of the adjacent insulating box body (1), and an electrode mechanism (8) is inserted into each of the two polar water chambers (12).

2. The ammonium nitrate wastewater electrodialysis device according to claim 1, wherein On the top and bottom of the cation exchange membrane (2), the anion exchange membrane (3), the first polar membrane (4) and the second polar membrane (5), a corrugated plate (6) is fixedly connected, and two corrugated plates (6) connected to the same membrane are jointly connected to a wedge-shaped frame (7). The insulating box body (1) is provided with a contraction groove (101) adapted to the wedge-shaped frame (7).

3. An ammonium nitrate wastewater electrodialysis device according to claim 2, characterized in that, The contraction groove (101) gradually contracts from top to bottom.

4. The electro-dialysis device for ammonium nitrate wastewater according to claim 1, characterized in that, The fresh water chamber (10), the concentrated water chamber (11) and the polar water chamber (12) are each provided with through holes communicating outward at both ends, and each through hole communicates with an external connection pipe (13).

5. The electro-dialysis device for ammonium nitrate wastewater according to claim 1, characterized in that, Each electrode mechanism (8) includes: a T-shaped slot (802) fixedly connected to the lower surface of the insulating top plate (9), and a conductive threaded column (805) fixedly embedded in the insulating top plate (9). The T-shaped slot (802) is slidably inserted with an electrode plate (801). The bottom of the conductive threaded column (805) is connected with a conductive spring (804). The bottom of the conductive spring (804) is connected with a telescopic conductive column (803) slidably connected to the insulating top plate (9), and the bottom of the telescopic conductive column (803) abuts against the electrode plate (801).

6. An ammonium nitrate wastewater electrodialysis device according to claim 1, characterized in that, Two exhaust pipes (901) extend upward from the insulating top plate (9), and the two exhaust pipes (901) are respectively communicated with the two polar water chambers (12).

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