Electrodialysis treatment device for nickel-containing soil leacheate

Abstract

The utility model relates to the technical field of soil remediation, and discloses an electrodialysis treatment device for nickel-containing soil leacheate, which comprises an electrodialysis membrane stack, an electrode liquid storage device, a phosphoric acid liquid storage device, an alkali liquid storage and filtration device, a leacheate storage device, a leacheate inlet pipeline and a power supply, a filtering medium is arranged in the alkali liquor storing and filtering device and is used for intercepting nickel hydroxide, so that nickel hydroxide precipitates generated by electrodialysis reaction in an experiment are filtered and collected, the problem that an experiment system is blocked by nickel hydroxide is effectively prevented, continuous proceeding of the experiment is ensured, and the experiment efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of soil remediation, in particular to an electrodialysis treatment device for nickel-containing soil eluent. Background Art

[0002] With the continuous development of steel production in my country, the iron smelting process has produced a large amount of pollutants, including harmful substances such as heavy metal nickel. The iron smelting production process is complex, with many process equipment, many types of pollutants and emission points, and a large land area, which has caused serious pollution to the soil and groundwater. Therefore, the soil remediation problem after the relocation of steel enterprises has become an important challenge in the field of soil remediation of heavily polluted enterprise land and industrial wasteland in my country.

[0003] In view of the heavy metal pollution problem generated during iron smelting, experimental research on how to remove heavy metals from soil is crucial. The electrodialysis method used in traditional experiments uses an electric field to cause heavy metal ions to precipitate or transfer to another electrode on the electrode and then separate them. However, a problem often encountered in experiments is that the nickel hydroxide precipitate formed in the experiment will block the experimental system after a period of time, thereby affecting the subsequent reaction. Utility Model Content

[0004] The purpose of the utility model is to solve at least one of the technical problems existing in the prior art and to provide an electrodialysis treatment device for nickel-containing soil eluent, which can filter the nickel hydroxide precipitate produced in the experiment to ensure that the experiment can be carried out continuously.

[0005] In order to achieve the above-mentioned object, the utility model provides an electrodialysis treatment device for nickel-containing soil eluent, the electrodialysis treatment device for nickel-containing soil eluent comprising an electrodialysis membrane stack, an electrode liquid storage device, a phosphoric acid liquid storage device, an alkali liquid storage and filtration device, an eluent storage device, an eluent inlet pipeline and a power supply;

[0006] The electrodialysis membrane stack comprises an anode plate, a first bipolar membrane, an anion exchange membrane, a cation exchange membrane, a second bipolar membrane and a cathode plate arranged in sequence, and the power supply is electrically connected to the anode plate and the cathode plate;

[0007] An alkali chamber is formed between the cation exchange membrane and the second bipolar membrane, the liquid outlet of the alkali solution storage and filtration device is connected to the inlet of the alkali chamber, the liquid inlet of the alkali solution storage and filtration device is connected to the outlet of the alkali chamber, and a filter medium is provided in the alkali solution storage and filtration device for intercepting nickel hydroxide.

[0008] In some embodiments, the filter medium is arranged around the central axis of the alkali liquid storage and filtering device to divide the internal space of the alkali liquid storage and filtering device into a first space and a second space. The liquid inlet of the alkali liquid storage and filtering device is connected to the first space, and the liquid outlet of the alkali liquid storage and filtering device is arranged on the bottom surface of the second space.

[0009] In some embodiments, the alkali solution storage and filtration device further comprises a shell, and a sediment collection device through which fluid can pass is disposed in the first space formed between the inner wall of the shell and the filter medium.

[0010] In some embodiments, the sediment collection device is detachably disposed in the first space.

[0011] In some embodiments, the sediment collection device is configured as an annular groove, the bottom of the annular groove fits with the bottom surface of the first space, the inner groove wall of the annular groove fits with the filter medium, and the outer groove wall of the annular groove fits with the inner wall of the shell.

[0012] In some embodiments, the liquid inlet of the alkali solution storage and filtration device is arranged on the upper side wall of the shell.

[0013] In some embodiments, a liquid control valve is provided on the pipeline connecting the liquid inlet of the alkali solution storage and filtration device and the alkali chamber outlet, and the liquid control valve is arranged at a position close to the liquid inlet of the alkali solution storage and filtration device.

[0014] In some embodiments, the eluent storage includes a first inlet and a second inlet, the first inlet is connected to the eluent entry pipeline, the outlet of the salt chamber formed between the anion exchange membrane and the cation exchange membrane is connected to the second inlet, and the outlet of the eluent storage is connected to the inlet of the salt chamber.

[0015] In some embodiments, a first peristaltic pump is provided on a pipeline connected to the inlet of the anode chamber formed between the anode plate and the first bipolar membrane, the inlet of the cathode chamber formed between the second bipolar membrane and the cathode plate, and the outlet of the electrode liquid storage, respectively;

[0016] A second peristaltic pump is provided on a pipeline connecting the inlet of the acid chamber formed between the first bipolar membrane and the anion exchange membrane and the outlet of the phosphoric acid liquid storage device;

[0017] A third peristaltic pump is provided on the pipeline connecting the inlet of the alkali chamber and the outlet of the alkali solution storage and filtration device;

[0018] A fourth peristaltic pump is provided on the pipeline connecting the inlet of the salt chamber and the outlet of the eluent storage.

[0019] In some embodiments, the bottom surface of the alkali solution storage and filtration device is provided with an annular mounting groove for fixing the filter medium.

[0020] Through the above technical scheme, an alkaline solution storage and filtration device is set up in the electrodialysis experimental system of nickel-containing soil eluent, which can filter and collect the NiOH precipitate produced by the electrodialysis reaction in the experiment, effectively prevent the problem of NiOH clogging the experimental system, ensure the continuity of the experiment, and improve the experimental efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the principle of an electrodialysis treatment device for nickel-containing soil eluent provided by the utility model;

[0022] Figure 2 is a top view of the alkali solution storage and filtration device;

[0023] Figure 3 is a schematic diagram of the structure of a sediment collection device;

[0024] Figure 4 It is a structural schematic diagram of an annular mounting groove in an alkali solution storage and filtration device.

[0025] Description of Reference Numerals

[0026] 10. Electrodialysis membrane stack; 101. Anode plate; 102. First bipolar membrane; 103. Anion exchange membrane; 104. Cation exchange membrane; 105. Second bipolar membrane; 106. Cathode plate; 20. Electrode liquid storage device; 21. First peristaltic pump; 30. Phosphoric acid liquid storage device; 31. Second peristaltic pump; 40. Alkaline liquid storage and filtration device; 41. Filter medium; 42. Shell; 43. Sediment collection device; 44. First space; 45. Second space; 46. Liquid control valve; 47. Third peristaltic pump; 48. Annular mounting groove; 50. Eluent storage device; 51. First inlet; 52. Second inlet; 53. Fourth peristaltic pump; 60. Eluent inlet pipeline; 70. Power supply. DETAILED DESCRIPTION

[0027] The specific implementation of the present invention is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the present invention, and is not used to limit the present invention.

[0028] Combination Figure 1 As shown, the utility model provides an electrodialysis treatment device for nickel-containing soil eluent, comprising an electrodialysis membrane stack 10, an electrode liquid storage 20, a phosphoric acid liquid storage 30, an alkali liquid storage and filtering device 40, an eluent storage 50, an eluent inlet pipeline 60 and a power supply 70;

[0029] The power source 70 is electrically connected to the anode plate 101 and the cathode plate 106 to form an electric field;

[0030] The electrodialysis membrane stack 10 comprises an anode plate 101, a first bipolar membrane 102, an anion exchange membrane 103, a cation exchange membrane 104, a second bipolar membrane 105 and a cathode plate 106 arranged in sequence, and these membranes selectively separate different ions under the action of an electric field;

[0031] Wherein, an anode chamber is formed between the anode plate 101 and the first bipolar membrane 102, an acid chamber is formed between the first bipolar membrane 102 and the anion exchange membrane 103, a salt chamber is formed between the anion exchange membrane 103 and the cation exchange membrane 104, an alkali chamber is formed between the cation exchange membrane 104 and the second bipolar membrane 105, and a cathode chamber is formed between the second bipolar membrane 105 and the cathode plate 106, each corresponding to a different ion migration and processing area;

[0032] The outlet of the electrode liquid storage 20 is connected to the inlet of the anode chamber and the cathode chamber respectively, and the inlet of the electrode liquid storage 20 is connected to the outlet of the anode chamber and the cathode chamber respectively, so as to realize the self-circulation of the electrode liquid, effectively save resources, and ensure the stability and continuity of the system;

[0033] The outlet of the phosphoric acid liquid storage 30 is connected to the inlet of the acid chamber, and the inlet of the phosphoric acid liquid storage 30 is connected to the outlet of the acid chamber;

[0034] The outlet of the alkali liquid storage and filtering device 40 is connected to the inlet of the alkali chamber, and the inlet of the alkali liquid storage and filtering device 40 is connected to the outlet of the alkali chamber. The alkali liquid storage and filtering device 40 is provided with a filter medium 41 for intercepting nickel hydroxide precipitate. It can be understood that in the present utility model, the nickel hydroxide produced by the electrodialysis reaction is circulated to the alkali liquid storage and filtering device 40 and is intercepted by the filter medium 41, and the filtrate with the nickel hydroxide removed re-enters the electrodialysis membrane stack for electrodialysis reaction, thereby avoiding NiOH generated after a period of experiment to block the system and achieving the continuity of the experiment. At the same time, the eluent with nickel removed can be reused to elute the soil, thereby achieving effective recovery and reuse of resources and reducing the impact of waste liquid discharge on the environment.

[0035] like Figure 2As shown, in the utility model, the filter medium 41 is arranged around the central axis of the alkali liquid storage and filtering device 40 to divide the internal space of the alkali liquid storage and filtering device 40 into a first space 44 and a second space 45. The liquid inlet of the alkali liquid storage and filtering device 40 is connected to the first space 44, and the liquid outlet of the alkali liquid storage and filtering device 40 is arranged on the bottom surface of the second space 45. It can be understood that the filter medium 41 is arranged around the central axis of the alkali liquid storage and filtering device to ensure the uniform distribution of the filter medium inside the device, thereby improving the filtering efficiency and consistency. The liquid inlet is connected to the first space 44, and the liquid outlet is arranged on the bottom surface of the second space 45. This arrangement of the inner and outer spaces requires the fluid to pass through the filter medium when passing through the device, so that the nickel hydroxide particles can be effectively separated from the fluid. The second space 45 receives the filtered fluid, and the first space 44 is used to collect and isolate the retained nickel hydroxide particles.

[0036] Furthermore, the alkali liquid storage and filtration device 40 further comprises a housing 42, and a sediment collecting device 43 through which fluid can pass is arranged in the first space 44 formed between the inner wall of the housing 42 and the filter medium 41. Figure 3 The precipitate collecting device 43 is used to collect precipitates such as nickel hydroxide intercepted by the filter medium 41 in the alkali solution storage and filtering device 40 .

[0037] Furthermore, the sediment collecting device 43 is detachably disposed in the first space 44 . The detachable design makes it easy to remove and install the sediment collecting device 43 , thereby facilitating cleaning and maintenance.

[0038] Specifically, the sediment collecting device 43 is configured as an annular groove, the bottom of the annular groove is in contact with the bottom surface of the first space 44, the inner groove wall of the annular groove is in contact with the filter medium 41, and the outer groove wall of the annular groove is in contact with the inner wall of the shell 42. It can be understood that the bottom of the annular groove can be configured as a non-permeable or permeable structure, and the inner and outer groove walls are configured as a permeable structure, which ensures the free flow of the fluid inside the groove and prevents the overflow of the sediment, thereby effectively realizing the collection and separation of the sediment.

[0039] In the present invention, the liquid inlet of the alkali solution storage and filtering device 40 is arranged on the upper side wall of the housing 42 .

[0040] Preferably, if Figure 1As shown, a liquid control valve 46 is provided on the pipeline connecting the liquid inlet of the alkali liquid storage and filtering device 40 and the outlet of the alkali chamber. The liquid control valve 46 is provided at a position close to the liquid inlet of the alkali liquid storage and filtering device 40. The provision of the liquid control valve 46 enables the operator to control the flow of alkali liquid entering the device at any time, thereby improving the flexibility and safety of the operation. When emergency stop or flow adjustment is required, it can be achieved by adjusting the liquid control valve to ensure the safe operation of the device.

[0041] In the present invention, the eluent storage 50 includes a first inlet 51 and a second inlet 52, the first inlet 51 is connected to the eluent entry pipe 60, the outlet of the salt chamber formed between the anion exchange membrane 103 and the cation exchange membrane 104 is connected to the second inlet 52, and the outlet of the eluent storage 50 is connected to the inlet of the salt chamber, so that the eluent and the solution in the salt chamber can be effectively circulated.

[0042] More preferably, a first peristaltic pump 21 is provided on the pipes connecting the inlet of the anode chamber and the inlet of the cathode chamber respectively with the outlet of the electrode liquid storage 20; a second peristaltic pump 31 is provided on the pipe connecting the inlet of the acid chamber with the outlet of the phosphoric acid liquid storage 30; a third peristaltic pump 47 is provided on the pipe connecting the inlet of the alkali chamber with the outlet of the alkali liquid storage and filtration device 40; and a fourth peristaltic pump 53 is provided on the pipe connecting the inlet of the salt chamber with the outlet of the eluent storage (50).

[0043] In the present utility model, if Figure 4 As shown, the bottom surface of the alkali solution storage and filtering device 40 is provided with an annular mounting groove 48 for fixing the filtering medium 41 .

Claims

1. An electrodialysis treatment device for nickel-containing soil eluent, characterized in that: The electrodialysis treatment device for nickel-containing soil eluent comprises an electrodialysis membrane stack (10), an electrode liquid storage device (20), a phosphoric acid liquid storage device (30), an alkali liquid storage and filtering device (40), an eluent storage device (50), an eluent inlet pipeline (60) and a power supply (70); The electrodialysis membrane stack (10) comprises an anode plate (101), a first bipolar membrane (102), an anion exchange membrane (103), a cation exchange membrane (104), a second bipolar membrane (105) and a cathode plate (106) arranged in sequence, and the power supply (70) is electrically connected to the anode plate (101) and the cathode plate (106); An alkali chamber is formed between the cation exchange membrane (104) and the second bipolar membrane (105); the liquid outlet of the alkali solution storage and filtration device (40) is connected to the inlet of the alkali chamber; the liquid inlet of the alkali solution storage and filtration device (40) is connected to the outlet of the alkali chamber; and a filter medium (41) is provided in the alkali solution storage and filtration device (40) for intercepting nickel hydroxide.

2. The electrodialysis treatment device for nickel-containing soil eluent according to claim 1, characterized in that: The filter medium (41) is arranged around the central axis of the alkali liquid storage and filtering device (40) to divide the internal space of the alkali liquid storage and filtering device (40) into a first space (44) and a second space (45); the liquid inlet of the alkali liquid storage and filtering device (40) is connected to the first space (44), and the liquid outlet of the alkali liquid storage and filtering device (40) is arranged on the bottom surface of the second space (45).

3. The electrodialysis treatment device for nickel-containing soil eluent according to claim 2, characterized in that: The alkali solution storage and filtering device (40) further comprises a shell (42), and a sediment collecting device (43) through which fluid can pass is arranged in the first space (44) formed between the inner wall of the shell (42) and the filtering medium (41).

4. The electrodialysis treatment device for nickel-containing soil eluent according to claim 3, characterized in that: The sediment collecting device (43) is detachably arranged in the first space (44).

5. The electrodialysis treatment device for nickel-containing soil eluent according to claim 3, characterized in that: The sediment collecting device (43) is configured as an annular groove, the bottom of which is in contact with the bottom surface of the first space (44), the inner wall of which is in contact with the filter medium (41), and the outer wall of which is in contact with the inner wall of the shell (42).

6. The electrodialysis treatment device for nickel-containing soil eluent according to claim 3, characterized in that: The liquid inlet of the alkali solution storage and filtering device (40) is arranged on the upper side wall of the housing (42).

7. The electrodialysis treatment device for nickel-containing soil eluent according to claim 1, characterized in that: A liquid control valve (46) is provided on a pipeline connecting the liquid inlet of the alkali solution storage and filtering device (40) and the outlet of the alkali chamber. The liquid control valve (46) is arranged at a position close to the liquid inlet of the alkali solution storage and filtering device (40).

8. The electrodialysis treatment device for nickel-containing soil eluent according to claim 1, characterized in that: The eluent storage (50) comprises a first inlet (51) and a second inlet (52), wherein the first inlet (51) is connected to the eluent entry pipe (60), the outlet of the salt chamber formed between the anion exchange membrane (103) and the cation exchange membrane (104) is connected to the second inlet (52), and the outlet of the eluent storage (50) is connected to the inlet of the salt chamber.

9. The electrodialysis treatment device for nickel-containing soil eluate according to claim 8, characterized in that: A first peristaltic pump (21) is provided on a pipeline connected to the inlet of the anode chamber formed between the anode plate (101) and the first bipolar membrane (102), the inlet of the cathode chamber formed between the second bipolar membrane (105) and the cathode plate (106), and the outlet of the electrode liquid storage (20); A second peristaltic pump (31) is provided on a pipeline connecting the inlet of the acid chamber formed between the first bipolar membrane (102) and the anion exchange membrane (103) and the outlet of the phosphoric acid solution storage (30); A third peristaltic pump (47) is provided on a pipeline connecting the inlet of the alkali chamber and the outlet of the alkali solution storage and filtering device (40); A fourth peristaltic pump (53) is provided on a pipeline connecting the inlet of the salt chamber and the outlet of the eluent storage (50).

10. The electrodialysis treatment device for nickel-containing soil eluate according to claim 1, characterized in that: The bottom surface of the alkali solution storage and filtering device (40) is provided with an annular mounting groove (48) for fixing the filtering medium (41).

Images