Device for electrokinetic remediation of heavy metal contaminated soil
By installing anion and cation permeation membranes in the electrolysis chamber, the problems of high energy consumption and precipitate blockage in electroremediation were solved, achieving efficient remediation of heavy metal contaminated soil and reducing energy consumption and material loss.
Patent Information
- Application Number
- CN202423051860.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-10
- Publication Date
- 2025-11-25
- Estimated Expiration
- 2034-12-10
AI Technical Summary
In existing electric repair technologies, the ion migration distance during the electrolysis process in the electrolytic cell is too long, resulting in excessive energy consumption. Cathode deposits can easily clog the peristaltic pump tubes, reducing repair efficiency. Furthermore, the peristaltic pump tubes are prone to liquid backflow, affecting the repair effect.
An anion exchange membrane and a cation exchange membrane are installed in the electrolysis chamber. Heavy metal cations accumulate on one side of the anion exchange membrane to form precipitates, while hydroxide ions react with them to form metal precipitates that accumulate on the outside of the membrane. This prevents the precipitates from clogging the peristaltic pump tubes, and energy consumption is reduced by optimizing the size of the electrolysis chamber and the design of the peristaltic pump.
It improves the efficiency of electric repair, reduces energy consumption, reduces material loss of peristaltic pump tubing, prevents liquid backflow, and enhances the repair effect.
Smart Images
Figure CN223587993U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to the soil electric dynamic repair technical field, concretely relates to a device for electric dynamic repair of heavy metal contaminated soil. BACKGROUND
[0002] With the development of industrial society, the substandard discharge of waste water, and the pollutants containing heavy metals entering the environment through various channels, the heavy metal pollution of soil is increasingly serious. The heavy metal pollutants have poor migration in soil and cannot be utilized by microorganisms, and finally are enriched in human bodies through the food chain, endangering the health of human beings.
[0003] The electric dynamic repair is to insert electrodes into soil, and under the action of a stable electric field, the pollutants attached to the surface of soil particles are moved directionally through the electric migration, and the pollutants are finally enriched near the electrode area, and then are treated by separation, so as to remove the pollutants. However, the ion migration distance is too long in the electrolytic process of the commonly used electrolytic cell, which results in too large energy consumption, increased repair time, and a large amount of cathode precipitates generated by the electrolytic metal cations, which easily block the peristaltic pump pipe for adding chemicals, waste the pipe material, and cause the peristaltic pump pipe immersed in the electrolyte to easily cause liquid backflow, pollute the buffer solution, and reduce the electric dynamic repair efficiency. SUMMARY
[0004] In view of the above problems, the utility model aims at providing a device for electric dynamic repair of heavy metal contaminated soil, which can gather the precipitates generated by the electrolytic metal cations outside the cathode chamber, so as to improve the electric dynamic repair efficiency.
[0005] In order to achieve the above purpose, the utility model adopts the technical scheme of:
[0006] A device for electric dynamic repair of heavy metal contaminated soil, comprising an electrolytic chamber and a power supply, wherein an anode chamber and a cathode chamber are respectively arranged on opposite sides in the electrolytic chamber; an anode plate is arranged in the anode chamber, and a cathode plate is arranged in the cathode chamber; the anode plate and the cathode plate are respectively connected with the power supply; and the structural feature is that a vertical anion permeation membrane is arranged on the side of the electrolytic chamber close to the cathode chamber, and the anode chamber and the cathode chamber are respectively located on opposite sides of the anion permeation membrane.
[0007] When the device is used for electric dynamic repair, the heavy metal cations in the soil migrate from the anode to the cathode, and the heavy metal cations are gathered on one side of the anion permeation membrane but cannot pass through the anion permeation membrane due to the arrangement of the anion permeation membrane on one side of the cathode chamber. Meanwhile, the hydroxyl ions generated in the cathode chamber migrate to the anode under the action of the electric field, the hydroxyl ions pass through the anion permeation membrane and react with the heavy metal cations to generate metal precipitates, the metal precipitates are gathered on one side of the anion permeation membrane and outside the cathode chamber, do not affect the chemical adding pipe of the cathode chamber, reduce the waste of pipe material, and improve the electric dynamic repair efficiency.
[0008] Preferably, the cation permeable membrane is vertically arranged in the electrolysis chamber, and the anode chamber and the anion permeable membrane are respectively arranged on opposite sides of the cation permeable membrane. The cation permeable membrane can avoid the entry of hydroxyl ions into the soil outside the cation permeable membrane, so that the metal precipitates are gathered between the cation permeable membrane and the anion permeable membrane, the focusing effect is avoided, and the electrokinetic remediation efficiency is improved.
[0009] Specifically, the anion permeable membrane is fixed by a first partition plate, and the cation permeable membrane is fixed by a second partition plate, and the first partition plate and the side wall of the electrolysis chamber form the cathode chamber.
[0010] Preferably, the first partition plate and the second partition plate are arranged in parallel, and the first partition plate and the second partition plate are in abutment with the inner wall of the electrolysis chamber, and the first partition plate and the second partition plate form the precipitation chamber.
[0011] Specifically, one side of the electrolysis chamber is separated by a third partition plate to form the anode chamber, and the third partition plate is provided with a filter screen. The third partition plate can be a full-hole plate.
[0012] Preferably, the mesh number of the filter screen is 80-100.
[0013] Specifically, the electrolysis chamber is provided with a buffer tank outside, and the buffer liquid in the buffer tank is transported to the cathode chamber by a peristaltic pump pipe under the action of the peristaltic pump.
[0014] Preferably, the inner wall of the cathode chamber is provided with a peristaltic pump pipe groove at the upper portion, and the end portion of the peristaltic pump pipe is fixed in the peristaltic pump pipe groove. The peristaltic pump pipe is inserted into the peristaltic pump pipe groove, so that the peristaltic pump pipe is prevented from contacting the working liquid in the cathode chamber, thereby preventing the working liquid from flowing back.
[0015] Preferably, the length:width:height of the electrolysis chamber is 1-2:2-4:1-2. By designing the size of the electrolysis chamber, the distance between the anode and the cathode is reduced, the driving voltage of the power supply is reduced when the same quality of contaminated soil is remediated, and the energy consumption is reduced.
[0016] Specifically, the side wall of the anode chamber and the side wall of the cathode chamber are respectively provided with overflow ports, and the outer side of the anode chamber and the outer side of the cathode chamber are respectively provided with waste liquid tanks, and the overflow ports are respectively connected with the waste liquid tanks.
[0017] Compared with the prior art, the device for electrokinetic remediation of heavy metal contaminated soil provided by the utility model reduces the energy consumption of electrokinetic remediation, reduces the loss of peristaltic pump pipe material, prevents the electrolysis working liquid from flowing back, and improves the electrokinetic remediation efficiency. BRIEF DESCRIPTION OF DRAWINGS
[0018] Figure 1The device for electrically repairing heavy metal contaminated soil is a structure diagram of the device.
[0019] In the drawings:
[0020] 1-anode chamber; 2-electrolytic chamber; 3-peristaltic pump pipe groove; 4-filter screen; 5-precipitation chamber; 6-overflow port; 7-cathode chamber; 8-cation permeable membrane; 9-anion permeable membrane; 10-first partition plate; 11-anode plate; 12-cathode plate; 13-power supply; 14-second partition plate; 15-third partition plate; 16-buffer solution tank; 17-peristaltic pump; 18-peristaltic pump pipe; 19-waste liquid tank. DETAILED DESCRIPTION
[0021] The utility model will be described in detail below with reference to the drawings and in combination with the embodiments. It should be noted that the embodiments in the utility model and the features in the embodiments can be combined with each other without conflict. For the sake of description, if "up", "down", "left" and "right" appear in the following text, they only mean the same direction as the up, down, left and right of the drawings, and do not limit the structure.
[0022] As Figure 1 shown, the embodiment provides a device for electrically repairing heavy metal contaminated soil, which comprises an electrolytic chamber 2 and a power supply 13, and an anode chamber 1 and a cathode chamber 7 are arranged at opposite sides in the electrolytic chamber 2. An anode plate 11 is arranged in the anode chamber 1, and a cathode plate 12 is arranged in the cathode chamber 7, and the anode plate 11 and the cathode plate 12 are connected with the power supply 13. A cation permeable membrane 8 and an anion permeable membrane 9 are vertically arranged on one side of the electrolytic chamber 2 close to the cathode chamber 7, and the cation permeable membrane 8 and the anion permeable membrane 9 are parallel, and the anion permeable membrane 9 is arranged between the cathode chamber 7 and the cation permeable membrane 8. The anion permeable membrane 9 is fixed through a first partition plate 10, the cation permeable membrane 8 is fixed through a second partition plate 14, and the first partition plate 10 and the second partition plate 14 are parallel, and the first partition plate 10 and the second partition plate 14 are in abutment with the inner wall of the electrolytic chamber 2, and the first partition plate 10 and the second partition plate 14 form a precipitation chamber 5 between them. The left side of the electrolytic chamber 2 is separated from the anode chamber 1 through a third partition plate 15, and the first partition plate 10, the second partition plate 14 and the third partition plate 15 are all full-hole plates. The third partition plate 15 is provided with a filter screen 4, and the mesh number of the filter screen 4 is 80-100 meshes. The outer side of the electrolytic chamber 2 is provided with a buffer solution tank 16, and the buffer solution in the buffer solution tank 16 is conveyed to the cathode chamber 7 through a peristaltic pump pipe 18 under the action of a peristaltic pump 17. The inner wall of the cathode chamber 7 is provided with a peristaltic pump pipe groove 3, and the end of the peristaltic pump pipe 18 is fixed in the peristaltic pump pipe groove 3. The side walls of the anode chamber 1 and the cathode chamber 7 are both provided with overflow ports 6, the outer sides of the anode chamber 1 and the cathode chamber 7 are both provided with waste liquid tanks 19, and the overflow ports 6 are respectively connected with the waste liquid tanks 19.
[0023] The main working process of the device is shown as follows:
[0024] The heavy metal contaminated soil is wetted by water, stirred into mud and put into the electrolysis chamber 2, and the peristaltic pump pipe 18 is inserted into the peristaltic pump pipe groove 3 of the cathode chamber 7. According to the soil properties, the corresponding voltage and buffer flow are set, the device is operated, and the soil remediation experiment starts. In the process of migration of heavy metal cations in the soil from the anode to the cathode, the heavy metal cations pass through the cation permeable membrane 8 but cannot pass through the anion permeable membrane 9, thereby gathering in the precipitation chamber 5. At the same time, the hydroxyl ions generated in the cathode chamber 7 migrate to the anode under the action of the electric field, and the hydroxyl ions pass through the anion permeable membrane 9 and react with the heavy metal cations to generate metal precipitates. The cation permeable membrane 8 prevents the hydroxyl ions from entering the soil on the left side of the cation permeable membrane 8, thereby gathering the metal precipitates in the precipitation chamber 5. When the soil heavy metal concentration in the electrolysis chamber 2 reaches the standard, the device stops running.
[0025] The content illustrated in the above embodiments should be understood as the embodiments only for more clearly illustrating the utility model, and is not used for limiting the range of the utility model, and after reading the utility model, the modification of various equivalent forms of the embodiments by the person skilled in the art all fall into the range defined by the claims of the utility model.
Claims
1. An electro-remediation device for heavy metal contaminated soil, comprising an electrolysis chamber (2) and a power supply (13), wherein an anode chamber (1) and a cathode chamber (7) are respectively arranged on opposite sides of the electrolysis chamber (2); an anode plate (11) is arranged in the anode chamber (1), and a cathode plate (12) is arranged in the cathode chamber (7), wherein the anode plate (11) and the cathode plate (12) are respectively connected to the power supply (13); characterized in that: An anion permeation membrane (9) is vertically arranged in the electrolysis chamber (2) near the cathode chamber (7), and the anode chamber (1) and the cathode chamber (7) are located on opposite sides of the anion permeation membrane (9).
2. The apparatus for electrically remediating heavy metal contaminated soil according to claim 1, characterized in that: The electrolysis chamber (2) is vertically equipped with a cation permeation membrane (8), and the anode chamber (1) and the anion permeation membrane (9) are located on opposite sides of the cation permeation membrane (8).
3. The apparatus for electrically remediating heavy metal contaminated soil according to claim 2, characterized in that: The anion permeation membrane (9) is fixed by the first partition (10), and the cation permeation membrane (8) is fixed by the second partition (14). The first partition (10) and the side wall of the electrolysis chamber (2) form a cathode chamber (7).
4. The apparatus for electrically remediating heavy metal contaminated soil according to claim 3, characterized in that: The first partition (10) and the second partition (14) are arranged in parallel, and both the first partition (10) and the second partition (14) abut against the inner wall of the electrolysis chamber (2), forming a precipitation chamber (5) between the first partition (10) and the second partition (14).
5. The apparatus for electrically remediating heavy metal contaminated soil according to claim 3, characterized in that: The electrolysis chamber (2) is separated into an anode chamber (1) by a third partition (15) on one side, and a filter screen (4) is provided on the third partition (15).
6. The apparatus for electrically remediating heavy metal contaminated soil according to claim 5, characterized in that: The mesh size of the filter (4) is 80 to 100 mesh.
7. The apparatus for electrically remediating heavy metal contaminated soil according to claim 1, characterized in that: The electrolysis chamber (2) is provided with a buffer tank (16) on the outside. The buffer solution in the buffer tank (16) is transported to the cathode chamber (7) through the peristaltic pump pipe (18) under the action of the peristaltic pump (17).
8. The apparatus for electrically remediating heavy metal contaminated soil according to claim 7, characterized in that: The upper part of the inner wall of the cathode chamber (7) is provided with a peristaltic pump tube groove (3), and the end of the peristaltic pump tube (18) is fixed in the peristaltic pump tube groove (3).
9. The apparatus for electrically remediating heavy metal contaminated soil according to claim 1, characterized in that: The length:width:height of the electrolysis chamber (2) is 1~2:2~4:1~2.
10. The apparatus for electrically remediating heavy metal contaminated soil according to claim 1, characterized in that: Both the anode chamber (1) and the cathode chamber (7) are provided with overflow ports (6) on their side walls, and waste liquid tanks (19) are provided on the outside of both the anode chamber (1) and the cathode chamber (7). The overflow ports (6) are connected to the waste liquid tanks (19) respectively.