CN114769306A - Device and method for repairing composite heavy metal contaminated soil by combining electric leaching and leaching - Google Patents
Device and method for repairing composite heavy metal contaminated soil by combining electric leaching and leaching Download PDFInfo
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- 239000002689 soil Substances 0.000 title claims abstract description 92
- 238000002386 leaching Methods 0.000 title claims abstract description 54
- 229910001385 heavy metal Inorganic materials 0.000 title claims abstract description 48
- 238000000034 method Methods 0.000 title claims abstract description 16
- 239000002131 composite material Substances 0.000 title claims abstract description 15
- 239000007788 liquid Substances 0.000 claims abstract description 96
- 238000003860 storage Methods 0.000 claims abstract description 48
- 230000002093 peripheral effect Effects 0.000 claims abstract description 11
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 claims description 48
- 230000002572 peristaltic effect Effects 0.000 claims description 23
- 238000005067 remediation Methods 0.000 claims description 10
- 230000005684 electric field Effects 0.000 claims description 9
- ZGTMUACCHSMWAC-UHFFFAOYSA-L EDTA disodium salt (anhydrous) Chemical compound [Na+].[Na+].OC(=O)CN(CC([O-])=O)CCN(CC(O)=O)CC([O-])=O ZGTMUACCHSMWAC-UHFFFAOYSA-L 0.000 claims description 6
- 150000001875 compounds Chemical class 0.000 claims description 6
- 239000002905 metal composite material Substances 0.000 claims description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 3
- 238000005868 electrolysis reaction Methods 0.000 claims description 3
- 229910002804 graphite Inorganic materials 0.000 claims description 3
- 239000010439 graphite Substances 0.000 claims description 3
- 239000011550 stock solution Substances 0.000 claims 8
- 239000000243 solution Substances 0.000 claims 7
- 238000010828 elution Methods 0.000 claims 6
- 238000005406 washing Methods 0.000 claims 3
- 239000003795 chemical substances by application Substances 0.000 claims 1
- 238000009393 electroremediation Methods 0.000 claims 1
- 238000005516 engineering process Methods 0.000 abstract description 10
- 230000008439 repair process Effects 0.000 description 13
- 230000005520 electrodynamics Effects 0.000 description 6
- 229910052793 cadmium Inorganic materials 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 229910052745 lead Inorganic materials 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000007599 discharging Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 239000004927 clay Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000000536 complexating effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000003795 desorption Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000000909 electrodialysis Methods 0.000 description 1
- 238000001962 electrophoresis Methods 0.000 description 1
- 239000003480 eluent Substances 0.000 description 1
- 238000011066 ex-situ storage Methods 0.000 description 1
- 230000004720 fertilization Effects 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
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- 238000011105 stabilization Methods 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
- B09C1/08—Reclamation of contaminated soil chemically
- B09C1/085—Reclamation of contaminated soil chemically electrochemically, e.g. by electrokinetics
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
- B09C1/02—Extraction using liquids, e.g. washing, leaching, flotation
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- Life Sciences & Earth Sciences (AREA)
- Soil Sciences (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention discloses a device and a method for restoring composite heavy metal contaminated soil by an electric-leaching combined technology, and the device comprises a direct-current power supply, a first liquid storage chamber, a second liquid storage chamber, a third liquid storage chamber, a fourth liquid storage chamber, electrode chambers and a soil chamber, wherein the electrode chambers are arranged in the soil chamber, the number of the electrode chambers is multiple, the electrode chambers comprise a middle electrode chamber positioned in the soil chamber and peripheral electrode chambers arranged around the middle electrode chamber, electrode columns are respectively arranged in the electrode chambers, the electrode columns in the middle electrode chamber are connected with a cathode of the direct-current power supply, and the electrode columns in the peripheral electrode chambers are connected with an anode of the direct-current power supply 70 percent; by adopting the electric-leaching combined technology, leaching is carried out firstly, and then electric power is applied, so that the repairing time is greatly shortened, and the heavy metal removal rate is improved.
Description
Technical Field
The invention relates to the field of polluted soil treatment and restoration, in particular to a device and a method for restoring composite heavy metal polluted soil by combining electric leaching and leaching.
Background
With the development of social economy, the heavy metal content of soil is continuously accumulated by artificial activities such as mining, industrial production, agricultural fertilization and the like, the heavy metal content exceeds the self-cleaning capacity of the soil, and the social environment and public health are seriously harmed.
For heavy metal contaminated soil, remediation treatment can be performed by leaching, solidification-stabilization, chemical oxidation/reduction, phytoremediation, electrodynamics and other methods. The electric power repairing technology analyzes heavy metals from the surface of soil particles to pore water solution by arranging electrodes in a polluted site and applying voltage to the electrode ends, and then the heavy metals are transferred to an electrode chamber to be removed under the actions of electromigration, electrodialysis, electrophoresis, diffusion and the like. The method has the advantages of small influence on the soil structure, small secondary pollution, flexible adoption of an in-situ or ex-situ remediation mode and the like, and has a good application prospect. The traditional electric restoration research mainly uses a one-dimensional electric field (namely, one cathode and one anode), the potential difference of the soil in the field is unstable, the effective working area is small, the restoration time is long, the heavy metal removal rate is poor, and the treatment cost is high. The electric power repairing technology of the two-dimensional electric field can obviously improve the effective working area of the electric field, shorten the repairing time and improve the removal rate of heavy metals. The leaching technology can obviously accelerate the desorption time between heavy metal and soil particles, has the advantages of short repair period, high efficiency and the like, but has poor repair effect on low-permeability soil such as clay and the like. In conclusion, the single electrodynamic force or leaching remediation technology has more limitations in site remediation, so the electrokinetic-leaching combined remediation technology is adopted to remediate the soil polluted by the compound heavy metals.
Disclosure of Invention
In order to solve the technical problems, the technical scheme provided by the invention is as follows: a device for restoring composite heavy metal contaminated soil by combining electric leaching and leaching comprises a direct current power supply, a first liquid storage chamber, a second liquid storage chamber, a third liquid storage chamber, a fourth liquid storage chamber, an electrode chamber and a soil chamber, the electrode chambers are arranged in the soil chamber, the number of the electrode chambers is multiple, the electrode chambers comprise a middle electrode chamber positioned in the soil chamber and peripheral electrode chambers arranged around the middle electrode chamber, the electrode chambers are respectively provided with electrode columns, the electrode column in the middle electrode chamber is connected with the cathode of a direct current power supply, the electrode column in the peripheral electrode chamber is connected with the anode of a direct current power supply, the first liquid storage chamber extends into the soil chamber through a first liquid outlet pipe and is connected with a spray head, the second liquid storage chamber is connected with the peripheral electrode chamber through a second liquid outlet pipe, and the third liquid storage chamber and the fourth liquid storage chamber are connected with the middle electrode chamber through a third liquid outlet pipe and a fourth liquid outlet pipe respectively.
Furthermore, the electrode chamber is a porous column, and the electrode column is a graphite electrode column.
Further, filter paper is arranged on the inner wall of the electrode chamber.
Furthermore, peristaltic pumps are respectively arranged on the first liquid outlet pipe, the second liquid outlet pipe and the third liquid outlet pipe.
Furthermore, an ammeter is connected to the cathode of the direct current power supply.
Furthermore, an eluent is stored in the first liquid storage chamber, an anode repair liquid is stored in the second liquid storage chamber, a cathode repair liquid is stored in the third liquid storage chamber, and an overflow liquid is stored in the fourth liquid storage chamber.
The invention also discloses a method for restoring the soil polluted by the compound heavy metal by combining electric leaching and leaching, which comprises the following steps:
s1, leaching: according to the solid-liquid ratio of the soil to the leacheate of 1 g: 0.1-0.5 ml, conveying the leacheate in the first liquid storage chamber into a soil chamber through a peristaltic pump, leaching and repairing for 1-3 days, and draining redundant leacheate after leaching is finished;
s2, electric driving: applying an electric field to the washed polluted soil chamber, wherein the voltage is 1-3V/cm, and the initial current is 0.1-0.4A; inputting the repairing liquid in the second liquid storage chamber into the anode electrode chamber through a peristaltic pump, controlling the flow rate through the peristaltic pump, and controlling the liquid level height of the anode chamber to be consistent with the height of the repaired soil; the repair liquid in the third liquid storage chamber is input into the cathode electrode chamber through a peristaltic pump, the liquid level height of the cathode chamber is kept consistent with the soil height, and the repair liquid is automatically input into the fourth liquid storage chamber when the liquid level height exceeds a set height; the electrolysis time is 8-20 days; and finishing the restoration of the heavy metal composite polluted soil.
Further, in the step S1, the leacheate is an EDTA-2Na solution and a citric acid solution, the molar concentration of the EDTA-2Na solution is 0.05-1.0 mol/L, and the molar concentration of the citric acid solution is 0.1-1.0 mol/L; and in the step S1, the flow rate of the leacheate is controlled to be 0.5-1.0 mL/min by a peristaltic pump.
Further, in the step S2, the anode repair solution is citric acid, and the molar concentration is 0.1-1.0 mol/L; the cathode repairing solution is citric acid, and the molar concentration is 0.1-0.5 mol/L;
furthermore, after the soil near the cathode chamber is repaired in the step S2, the step S1 can be started again, and the leacheate in the first liquid storage chamber is input into the soil in the cathode region through the peristaltic pump and is carried out simultaneously with the electrokinetic force repairing.
The working principle of the invention is as follows: the restoring method of leaching first and then electric power is adopted. Firstly, a part of heavy metal enters the soil pore water solution under the complexing/acidifying action through leaching, and then is discharged along with the leaching solution. Secondly, under the condition of applying an electric field, the soil is further acidified, heavy metals are further desorbed, and finally the heavy metals are directionally transferred to an electrode chamber under the action of the electric field to form precipitates for removal.
Compared with the prior art, the invention has the following advantages:
(1) the invention provides a method for restoring soil polluted by composite heavy metals by using an electric-leaching combined technology, which is used for restoring the soil polluted by the heavy metals, and has higher removal effect on the heavy metals Pb and Cd, and the removal rates of the heavy metals Pb and Cd reach 80% and 70% respectively.
(2) The two-dimensional electrodynamic force repairing technology adopted by the invention greatly improves the effective working area of the electric field, so that heavy metals in the soil to be repaired can be effectively removed.
(3) The invention adopts the electric-leaching combined technology, leaching is carried out firstly, and then electric power is applied, so that the repair time is greatly shortened, and the heavy metal removal rate is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and those skilled in the art can also obtain other related drawings based on the drawings without inventive efforts.
FIG. 1 is a schematic diagram of connection of an electrode chamber, an electrode column and a direct current power supply in the device for repairing composite heavy metal contaminated soil by combining electric leaching and leaching.
FIG. 2 is a schematic diagram of connection between an electrode chamber and each liquid storage chamber in the device for repairing composite heavy metal contaminated soil by combining electric leaching and leaching.
FIG. 3 is a schematic disassembly diagram of the device for repairing the composite heavy metal contaminated soil by combining electric leaching and leaching.
FIG. 4 is a schematic distribution diagram of electrode chambers in the device for repairing composite heavy metal contaminated soil by combining electric leaching and leaching.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined or explained in subsequent figures.
In the description of the embodiments of the present invention, it should be noted that, if the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or the orientations or positional relationships that the products of the present invention are usually placed in when used, the orientations or positional relationships are only used for convenience of describing the present invention and simplifying the description, but the terms do not indicate or imply that the devices or elements indicated must have specific orientations, be constructed in specific orientations, and operate, and therefore, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
Furthermore, the terms "horizontal", "vertical", "suspended" and the like do not require that the components be absolutely horizontal or suspended, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the description of the embodiments of the present invention, "a plurality" means at least 2.
In the description of the embodiments of the present invention, it should be further noted that unless otherwise explicitly stated or limited, the terms "disposed," "mounted," "connected," and "connected" should be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
Examples
A device for repairing composite heavy metal contaminated soil through electric-leaching combined remediation comprises a direct current power supply 1, a first liquid storage chamber 2, a second liquid storage chamber 3, a third liquid storage chamber 10, a fourth liquid storage chamber 11, electrode chambers 4 and a soil chamber 5, wherein the electrode chambers 4 are arranged in the soil chamber 5, the number of the electrode chambers 4 is multiple, the device comprises a middle electrode chamber 401 positioned in the soil chamber 5 and peripheral electrode chambers 402 arranged around the middle electrode chamber 401, electrode columns 6 are respectively arranged in the electrode chambers 4, in the embodiment, the electrode chambers 4 are porous columns, the electrode columns 6 are graphite electrode columns, the electrode columns 6 in the middle electrode chamber 401 are connected with a cathode of the direct current power supply 1, the electrode columns 6 in the peripheral electrode chambers 402 are connected with an anode of the direct current power supply 1, a cathode of the direct current power supply 1 is connected with an ammeter 15, the first liquid storage chamber 2 extends into the soil chamber through a first liquid outlet pipe 7 and is connected with a spray head 8, the second liquid storage chamber 3 is connected with the peripheral electrode chamber 402 through a second liquid outlet pipe 9, and the third liquid storage chamber 10 and the fourth liquid storage chamber 11 are respectively connected with the middle electrode chamber 401 through a third liquid outlet pipe 12 and a fourth liquid outlet pipe 13; peristaltic pumps 14 are respectively arranged on the first liquid outlet pipe 7, the second liquid outlet pipe 9 and the third liquid outlet pipe 12, and filter paper is arranged on the inner wall of the electrode chamber 4.
In this embodiment, the first liquid storage chamber 2 stores an eluting solution, the second liquid storage chamber 3 stores an anode repair solution, the third liquid storage chamber 10 stores a cathode repair solution, and the fourth liquid storage chamber 11 stores an overflow solution.
The method for repairing the composite heavy metal contaminated soil by using the device comprises the following steps:
s1, leaching: according to the solid-liquid ratio of 1g of soil to leacheate: 0.1-0.5 ml of leacheate in the first liquid storage chamber is input into the soil chamber through a peristaltic pump, the leaching and repairing time is 1-3 days, and after the leaching is finished, redundant leacheate is drained; wherein the leacheate is an EDTA-2Na solution and a citric acid solution, the molar concentration of the EDTA-2Na solution is 0.05-1.0 mol/L, and the molar concentration of the citric acid solution is 0.1-1.0 mol/L; in the step S1, the flow rate of the leacheate is controlled to be 0.5-1.0 mL/min by a peristaltic pump.
S2, electric driving: applying an electric field to the washed polluted soil chamber, wherein the voltage is 1-3V/cm, and the initial current is 0.1-0.4A; inputting the repair liquid in the second liquid storage chamber into the anode electrode chamber through a peristaltic pump, and controlling the flow rate through the peristaltic pump to control the liquid level of the anode chamber to be consistent with the height of the repaired soil; the repair liquid in the third liquid storage chamber is input into the cathode electrode chamber through a peristaltic pump, the liquid level height of the cathode chamber is kept consistent with the soil height, and the repair liquid is automatically input into the fourth liquid storage chamber when the liquid level height exceeds a set height; the electrolysis time is 8-20 days; finishing the restoration of the heavy metal composite polluted soil, wherein the anode restoration liquid is citric acid, and the molar concentration is 0.1-1.0 mol/L; the cathode repairing solution is citric acid, and the molar concentration is 0.1-0.5 mol/L; in addition, after the soil is repaired to be hardened near the cathode chamber, S1 can be started again, and the leacheate in the first liquid storage chamber is conveyed into the soil in the cathode region through the peristaltic pump and is repaired simultaneously with the electrodynamic force.
Example one
The method for restoring the soil polluted by the compound heavy metal comprises the following steps: adding the leacheate into the polluted soil according to a certain water-soil ratio of 0.5:1, uniformly stirring, standing for 24h, and discharging the redundant solution. Placing the porous electrode column in a repairing device, covering a layer of filter paper on the inner wall of the electrode column, and then placing the columnar electrode in the repairing device; transferring the washed soil into an electrodynamic force repairing device, adding 0.3mol/L citric acid solution of anode repairing liquid into an anode chamber through a peristaltic pump, adding 0.1mol/L citric acid solution of cathode repairing liquid into a cathode chamber, keeping the height consistent with the height of the soil to be repaired, switching on a power supply, wherein the voltage is 2V/cm, the initial current is 0.7A, and the repairing time is 8 d. And finishing the restoration of the heavy metal composite polluted soil. And (5) adopting 20 dot soil to measure the content of the residual Pb and Cd in the soil. The average Pb removal rate is 72.2%, and the average Cd removal rate is 60.9%.
Example two
The method for restoring the soil polluted by the compound heavy metal comprises the following steps: adding 0.1mol/LEDTA-2Na solution of leacheate into the polluted soil according to a certain water-soil ratio of 0.5:1, uniformly stirring, standing for 24h, and discharging the redundant solution. Placing the porous electrode column in a repairing device, covering a layer of filter paper on the inner wall of the electrode column, and then placing the columnar electrode in the repairing device; transferring the washed soil into an electrodynamic force repairing device, adding an anode repairing solution of 0.3mol/L citric acid solution into an anode chamber through a peristaltic pump, adding a cathode repairing solution of 0.1mol/L citric acid solution into a cathode chamber, keeping the height consistent with the height of the soil to be repaired, switching on a power supply, controlling the voltage to be 2V/cm, the initial current to be 0.8A and the repairing time to be 8 d. And finishing the restoration of the heavy metal composite polluted soil. And after the remediation, 20 point soil is adopted, and the content of the residual Pb and Cd in the soil is measured. The average removal rate of Pb is 81.3 percent, and the average removal rate of Cd is 71.6 percent.
The present invention and its embodiments have been described above, and the description is not intended to be limiting, and the drawings show only one embodiment of the present invention, and the actual structure is not limited thereto. In summary, those skilled in the art should be able to conceive of the present invention without creative design of the similar structural modes and embodiments without departing from the spirit of the present invention, and all such modifications should fall within the protection scope of the present invention.
Claims (10)
1. The utility model provides a device of compound heavy metal contaminated soil is jointly restoreed in electronic-drip washing, a serial communication port, including DC power supply, first stock solution room, second stock solution room, third stock solution room, fourth stock solution room, electrode compartment and soil chamber, the electrode compartment sets up in the soil chamber, the quantity of electrode compartment is a plurality of, including being located the indoor middle electrode compartment of soil and setting up the peripheral electrode compartment around the middle electrode compartment, the electrode compartment is interior to be established and to be set up the electrode post respectively, the indoor electrode post of middle electrode is connected with the DC power supply negative pole, the indoor electrode post and the DC power supply positive pole of peripheral electrode are connected, first stock solution room stretches into the soil chamber through first drain pipe and connects the shower head, second stock solution room is connected with peripheral electrode compartment through the second drain pipe, third stock solution room, fourth stock solution room are respectively through third drain pipe, The fourth liquid outlet pipe is connected with the middle electrode chamber.
2. The device for remediating composite heavy metal contaminated soil by combining electrokinetic elution and leaching as claimed in claim 1, wherein the electrode chamber is a porous column, and the electrode column is a graphite electrode column.
3. The device for remediating the composite heavy metal contaminated soil through combination of electric leaching and leaching as claimed in claim 1, wherein the inner wall of the electrode chamber is provided with filter paper.
4. The device for remediating complex heavy metal contaminated soil by combining electric elution and elution as claimed in claim 1, wherein peristaltic pumps are respectively arranged on the first liquid outlet pipe, the second liquid outlet pipe and the third liquid outlet pipe.
5. The device for remediating complex heavy metal contaminated soil by combining electrokinetic-leaching according to claim 1, wherein an ammeter is connected to a cathode of the direct current power supply.
6. The device for remediating complex heavy metal contaminated soil by combining electrokinetic elution and elution as claimed in claim 1, wherein an elution agent is stored in the first liquid storage chamber, an anode remediation liquid is stored in the second liquid storage chamber, a cathode remediation liquid is stored in the third liquid storage chamber, and an overflow liquid is stored in the fourth liquid storage chamber.
7. The method for restoring the soil polluted by the compound heavy metal by combining electric leaching and leaching is characterized by comprising the following steps of:
s1, leaching: according to the solid-liquid ratio of 1g of soil to leacheate: 0.1-0.5 ml of leacheate in the first liquid storage chamber is input into the soil chamber through a peristaltic pump, the leaching and repairing time is 1-3 days, and after the leaching is finished, redundant leacheate is drained;
s2, electric driving: applying an electric field to the washed polluted soil chamber, wherein the voltage is 1-3V/cm, and the initial current is 0.1-0.4A; inputting the repairing liquid in the second liquid storage chamber into the anode electrode chamber through a peristaltic pump, controlling the flow rate through the peristaltic pump, and controlling the liquid level height of the anode chamber to be consistent with the height of the repaired soil; the repairing liquid in the third liquid storage chamber is input into the cathode electrode chamber through a peristaltic pump, the liquid level height of the cathode chamber is consistent with the soil height, and the repairing liquid is automatically input into the fourth liquid storage chamber when the liquid level height exceeds a set height; the electrolysis time is 8-20 days; and finishing the restoration of the heavy metal composite polluted soil.
8. The method for remediating the composite heavy metal contaminated soil through combination of electric leaching and leaching according to claim 1, wherein the leaching solution in the step S1 is EDTA-2Na solution and citric acid solution, the molar concentration of the EDTA-2Na solution is 0.05-1.0 mol/L, and the molar concentration of the citric acid solution is 0.1-1.0 mol/L; and in the step S1, the flow rate of the leacheate is controlled to be 0.5-1.0 mL/min through a peristaltic pump.
9. The method for remediating complex heavy metal contaminated soil by combining electrokinetic leaching and leaching according to claim 1, wherein the anode remediation solution in the step S2 is citric acid, and the molar concentration is 0.1-1.0 mol/L; the cathode repairing solution is citric acid, and the molar concentration is 0.1-0.5 mol/L.
10. The method for remediating complex heavy metal contaminated soil by combining electro-leaching and washing as claimed in claim 1, wherein the step S2 is performed until soil hardening phenomenon near the cathode chamber occurs, and then the step S1 is performed again, and the leachate in the first liquid storage chamber is pumped into the soil in the cathode region through a peristaltic pump, and the electro-leaching and washing are performed simultaneously with the electro-kinetic remediation.
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| CN217665395U (en) * | 2022-04-17 | 2022-10-28 | 江苏地质矿产设计研究院(中国煤炭地质总局检测中心) | Device for repairing composite heavy metal contaminated soil through combination of electric leaching and leaching |
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| CN102441564A (en) * | 2011-10-14 | 2012-05-09 | 上海市环境科学研究院 | Electric remediation method for heavy metal contaminated soil by composite electrode |
| CN103252344A (en) * | 2013-05-20 | 2013-08-21 | 华北电力大学 | Electrically-enhanced soil in-situ eluting and repairing device and method |
| US20140339086A1 (en) * | 2013-05-20 | 2014-11-20 | North China Electric Power University | Apparatus and method for electrokinetic in-situ leaching remediation of soil |
| CN103752599A (en) * | 2013-12-25 | 2014-04-30 | 天津生态城环保有限公司 | Equipment and method for restoring heavy metal contaminated soil by combining leaching and electro-deposition |
| CN104858225A (en) * | 2015-06-03 | 2015-08-26 | 江苏省环境科学研究院 | Device and method for washing and electrokinetic-combined remediation of heavy metal contaminated soil |
| CN108326030A (en) * | 2018-01-11 | 2018-07-27 | 上海理工大学 | The heavy metal-polluted soil prosthetic device of convertible array-type electrode |
| CN111054741A (en) * | 2019-12-30 | 2020-04-24 | 苏州弘宇水处理工程服务有限公司 | Method and device for repairing heavy metal-organic matter combined polluted soil by electric-leaching combined technology |
| CN217665395U (en) * | 2022-04-17 | 2022-10-28 | 江苏地质矿产设计研究院(中国煤炭地质总局检测中心) | Device for repairing composite heavy metal contaminated soil through combination of electric leaching and leaching |
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