CN106914486B - Electric remediation device and electric remediation method for heavy metal contaminated soil - Google Patents
Electric remediation device and electric remediation method for heavy metal contaminated soil Download PDFInfo
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- CN106914486B CN106914486B CN201710295059.1A CN201710295059A CN106914486B CN 106914486 B CN106914486 B CN 106914486B CN 201710295059 A CN201710295059 A CN 201710295059A CN 106914486 B CN106914486 B CN 106914486B
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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
Abstract
The invention discloses an electric remediation device and an electric remediation method for heavy metal contaminated soil. The electric repairing device comprises a power supply and a body, wherein an anode region, a detoxification region and a cathode region are sequentially arranged in the body, a filter plate is arranged between the anode region and the detoxification region, a composite filter plate is arranged between the detoxification region and the cathode region, the anode region is connected with the anode of the power supply, the cathode region is connected with the cathode of the power supply, the anode region is composed of an anode region polar plate and nutrient solution, the cathode region is composed of a cathode region polar plate and buffer solution, the composite filter plate is formed by stacking filter paper loaded with active carbon and porous sintered glass, the power supply is a programmable direct current power supply, and the voltage is square wave pulse voltage. The electric remediation method comprises the step of putting the pretreated heavy metal contaminated soil into an electric remediation device for remediation. The electric restoration device and the method have the advantages of solving the problem of alkaline zone migration, improving restoration efficiency, reducing soil nutrition loss, reducing power consumption and the like.
Description
Technical Field
The invention belongs to the field of soil treatment, relates to a treatment device and a treatment method for heavy metal contaminated soil, and particularly relates to an electric restoration device and an electric restoration method for heavy metal contaminated soil.
Background
According to geochemical survey reports (2015) of cultivated land in China issued by the Chinese geological survey bureau, 3488 ten thousand mu of heavily-polluted cultivated land with heavy metal and slightly-lightly polluted or overproof cultivated land with coverage area reaching 7899 thousand mu in China are shown, and the polluted or overproof cultivated land is mainly distributed in Jian Hui area, Min Yueqiong area and southwest area in south China. Heavy metals in the soil not only cause a reduction in the yield and quality of crops, but also can be concentrated by crops and endanger human health through the food chain, such as cadmium-containing rice and the like.
In view of the harmfulness of heavy metal pollution in soil in China, the State Council released the action plan for soil pollution control (abbreviated as "Ten items of soil") in 2016, 5, and 28 days. The safe utilization rate of the polluted cultivated land reaches about 90 percent and the safe utilization rate of the polluted land block reaches over 90 percent by 2020. The release of ten items of soil provides strong market demands for the remediation technology of the soil polluted by the heavy metals.
Aiming at the heavy metal pollution of soil, the research of related repair technologies at present mainly comprises technologies such as chemical extraction, immobilization, modifier application, phytoremediation, microbial remediation, electrodynamic force and the like. Among them, the electric remediation technology is a potential novel soil remediation technology developed in the last decade, and has received wide attention of researchers at home and abroad due to the characteristics of simple operation, short remediation time, high efficiency and the like.
However, the existing electric repair technology has some limitations in terms of marketable application, which mainly appear in the following aspects:
1) the alkaline zone of the cathode migrates to the anode, resulting in precipitation of heavy metals that cannot migrate out. The pH controls the adsorption and desorption, precipitation and dissolution of ions in the soil solution. Under the action of electric field, OH generated by cathode-Will move along the column towards the anode, forming a cathode alkaline zone, while the positively charged heavy metal ions will move towards the cathode. So that the heavy metal ions will react with OH-Meet in certain point in the earth pillar, and generate heavy metal and deposit, lead to the unable emigration of heavy metal, still can block up soil micropore, cause soil conductance to reduce, the restoration efficiency descends.
2) The electrokinetic process is not selective, resulting in soil nutrient deprivation. The electric restoration mainly depends on an electric field as a driving force, positive ions migrate to a cathode under the action of the electric field, and K in soil is not selective due to the electric field+The nutrient elements are also transferred out to the cathode at the same time; in addition, nutrient elements such as N, P in the soil are lost along with the removal of heavy metals, and finally the soil is nutrient-barren.
3) Large electric energy consumption, repairThe re-cost is high. At present, the electric restoration generally adopts a direct current power supply mode. Research shows that the traditional electric restoration is 1m3The polluted soil consumes about 40kwh of electric power, the whole treatment cost is about 10 times of the electric power, namely about 400 yuan is required for treating 1t of the polluted soil, and the cost for treating 1t of the polluted soil by the conventional method is only about 250 yuan.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides an electric repair device and an electric repair method for heavy metal contaminated soil, which can solve the problem of alkaline zone migration, improve the repair efficiency, reduce the soil nutrition loss and reduce the electric energy consumption.
In order to solve the technical problems, the invention adopts the following technical scheme.
The electric restoration device for the heavy metal contaminated soil comprises a power supply and a body, wherein an anode region, a detoxification region and a cathode region are sequentially arranged in the body, a filter plate is arranged between the anode region and the detoxification region, a composite filter plate is arranged between the detoxification region and the cathode region, the anode region is connected with the anode of the power supply, and the cathode region is connected with the cathode of the power supply;
the composite filter plate is formed by stacking filter paper loaded with activated carbon and porous sintered glass, and the filter paper loaded with the activated carbon is close to one side of the detoxification region;
the power supply is a programmable direct current power supply, the programmable direct current power supply is provided with a current display area, and the voltage provided by the programmable direct current power supply is square wave pulse voltage.
In the above electric remediation device for heavy metal contaminated soil, preferably, the anode region polar plate is composed of a titanium substrate loaded with a catalyst, the titanium substrate is a titanium plate, the mass fraction of titanium in the titanium plate is 87% -99%, the catalyst is ruthenium dioxide, and the loading amount of the catalyst is 0.4mg/cm2～0.8mg/cm2(ii) a The anode region polar plate is connected with the anode of the power supply, and the anode regionThe polar plate is partially immersed in the nutrient solution.
In the above electric remediation device for heavy metal contaminated soil, preferably, the cathode region plate is made of an aluminum material, the aluminum material is an aluminum plate, and the mass fraction of aluminum in the aluminum plate is 92% to 99%; the cathode region polar plate is connected with the negative electrode of the power supply, and the cathode region polar plate is partially immersed in the buffer solution.
In the above electric remediation device for heavy metal contaminated soil, preferably, the nutrient solution is composed of the following components: 0.2-0.4 mol/L humic acid, 0.1-0.3 mol/L citric acid and 0.05-0.1 mol/L potassium nitrate; and/or the buffer solution is potassium phosphate buffer solution, and the pH value of the buffer solution is 6-9.
In the above electric remediation device for heavy metal contaminated soil, preferably, the filter plate is made of porous sintered glass, the thickness of the porous sintered glass is 2mm to 5mm, and the pore diameter of the porous sintered glass is 0.05mm to 0.5 mm.
In the above electric remediation device for heavy metal contaminated soil, preferably, the thickness of the filter paper loaded with the activated carbon in the composite filter plate is 0.4mm to 0.6mm, the pore diameter of the filter paper loaded with the activated carbon is 1 μm to 10 μm, and the loading amount of the activated carbon is 10mg/cm2～50mg/cm2(ii) a The thickness of the porous sintered glass in the composite filter plate is 3 mm-8 mm, and the aperture of the porous sintered glass is 0.01 mm-0.2 mm.
In the electric remediation device for heavy metal contaminated soil, preferably, the pulse amplitude of the square-wave pulse voltage is +0.5V/cm to +2V/cm, the pulse width is 2s to 4s, and the pulse period is 2s to 8 s.
As a general technical concept, the invention also provides an electric remediation method of heavy metal contaminated soil, which comprises the following steps:
(1) after the heavy metal contaminated soil is air-dried and sieved, adjusting the water content to 25% -35% to obtain the pretreated heavy metal contaminated soil;
(2) and (2) loading the pretreated heavy metal contaminated soil into a detoxification area of the electric remediation device for the heavy metal contaminated soil, compacting, operating the electric remediation device for the heavy metal contaminated soil to remediate the pretreated heavy metal contaminated soil, and recovering flocculates generated in the cathode area after remediation is finished.
In the above method for electrically remedying heavy metal contaminated soil, preferably, in the step (1), the heavy metal contaminated soil is air-dried until the water content is 5% to 10%, and the diameter of the sieved sieve pore is 2mm to 4 mm;
and/or in the step (2), the compacted density of the pretreated heavy metal contaminated soil is 2000g/cm3～5000g/cm3(ii) a The maximum current of the repair is less than or equal to 0.2mA, the nutrient solution is supplemented to the anode region in the repair process, and the supplement amount of the nutrient solution is 10L/day/m3Detoxification area of 25L/day/m3The detoxification area (namely the supplement amount of the nutrient solution in the anode area is related to the volume of the detoxification area), and the repair time is 3-7 days; the floc is a precipitate containing aluminum and heavy metals.
In the method for electrically remedying the heavy metal-contaminated soil, the heavy metal in the heavy metal-contaminated soil preferably includes at least one of cadmium, lead, zinc and copper, and the soil in the heavy metal-contaminated soil is clay and/or silt.
Compared with the prior art, the invention has the advantages that:
1. in the electric remediation device for heavy metal contaminated soil, the composite filter plate loaded with the activated carbon filter paper forms a micro electric field between the detoxification area and the cathode area, so that the migration speed of heavy metal ions from the detoxification area to the cathode area is accelerated; meanwhile, an acidic atmosphere is created between the detoxification area and the cathode area due to the generation of the micro electric field, so that the problem that the charged heavy metal ions are precipitated and cannot be continuously migrated due to the fact that an alkaline zone migrates from the cathode area to the detoxification area in the traditional electric repair is solved. The addition of the anode nutrient solution not only obviously improves the electric remediation efficiency of the heavy metal contaminated soil, but also solves the problem of soil nutrient impoverishment caused by the traditional electric remediation. The use of the square wave pulse voltage obviously reduces the electric energy consumption in the electric repair process, and lays a foundation for the commercial application of the electric repair process.
2. The electric remediation method for the heavy metal contaminated soil has the advantages of realizing the removal of the heavy metal in the soil in the detoxification area, synchronously flocculating, precipitating and recycling the heavy metal in the solution in the cathode area, and saving the operation cost of the technology without matching with subsequent wastewater treatment facilities. In addition, the method adopts the current as a judgment index of the repair end point instead of the heavy metal content in the soil as the judgment index, so that the method has practical application operability.
Drawings
Fig. 1 is a schematic structural view of an electric remediation device for heavy metal contaminated soil according to embodiment 1 of the present invention.
Fig. 2 is an electron microscope image of a titanium substrate loaded with a catalyst in an anode region of an electrokinetic remediation device for heavy metal contaminated soil according to example 1 of the present invention.
Fig. 3 is a schematic diagram of a square-wave pulse voltage in embodiment 1 of the present invention.
FIG. 4 is a graph showing an energy spectrum of flocs produced in the cathode region in example 2 of the present invention.
Illustration of the drawings:
1. an anode region plate; 2. filtering the plate; 3. a detoxification area; 4. a composite filter plate; 5. a cathode region plate; 6. flocculating; 7. a power source; 8. an anode region; 9. a cathode region; 10. activated carbon loaded filter paper; 11. a body.
Detailed Description
The invention is further described below with reference to the drawings and specific preferred embodiments of the description, without thereby limiting the scope of protection of the invention.
The materials and equipment used in the following examples are commercially available.
Example 1:
an electric restoration device for heavy metal contaminated soil, as shown in fig. 1, comprises a power supply 7 and a body 11, wherein an anode region 8, a detoxification region 3 and a cathode region 9 are sequentially arranged in the body 11, a filter plate 2 for preventing fine particles in the detoxification region 3 from reversely migrating to the anode region 8 is arranged between the anode region 8 and the detoxification region 3, and a composite filter plate 4 for simultaneously creating a micro-electric field and an acidic atmosphere is arranged between the detoxification region 3 and the cathode region 9, so that the migration speed of heavy metal ions from the detoxification region 3 to the cathode region 9 is accelerated, and heavy metal precipitation in the detoxification region 3 is prevented. The anode region 8 is connected to the positive pole of the power supply 7, and the cathode region 9 is connected to the negative pole of the power supply 7.
In this embodiment, the anode region 8 is composed of an anode region plate 1 and a nutrient solution (the nutrient solution is not shown in fig. 1), the anode region plate 1 is partially immersed in the nutrient solution, and the anode region plate 1 is connected to the positive electrode of the power supply 7. The anode region polar plate 1 is composed of a titanium substrate loaded with a catalyst, FIG. 2 is an SEM image of the titanium substrate loaded with the catalyst, the titanium substrate is a titanium plate, the mass fraction of titanium in the titanium plate is 91 percent and can be 87 to 99 percent, the catalyst is ruthenium dioxide, and the loading amount of the ruthenium dioxide on the titanium plate is 0.4mg/cm2，0.4mg/cm2～0.8mg/cm2All can be used. The volume of the nutrient solution used was 196mL (generally 2/3 of the volume of the anode region) supplemented with 20L/day/m3The volume of the detoxification area comprises the following components in addition: 0.4mol/L humic acid, 0.2mol/L citric acid and 0.07mol/L potassium nitrate. In the present invention, the composition of the nutrient solution can be implemented as follows: 0.2-0.4 mol/L humic acid, 0.1-0.3 mol/L citric acid and 0.05-0.1 mol/L potassium nitrate.
The cathode region 9 is composed of a cathode region plate 5 and a buffer solution (the buffer solution is omitted in fig. 1), the cathode region plate 5 is partially immersed in the buffer solution, and the cathode region plate 5 is connected with the negative electrode of the power supply 7. The cathode region polar plate 5 is made of aluminum material, the aluminum material is 1050 type aluminum plate, the mass fraction of aluminum in the aluminum plate is 94%, and the mass fraction of aluminum in the aluminum plate can be 92% -99%. The buffer solution is potassium phosphate buffer solution, the volume of the potassium phosphate buffer solution is 196mL (generally 2/3 of the volume of the cathode region), the composition is 1.39mol/L potassium monohydrogen phosphate and 3.61mol/L potassium dihydrogen phosphate, and the pH value can be 6.4 and 6-9.
In this embodiment, the filter plate 2 is made of porous sintered glass, the thickness of the porous sintered glass may be 3mm or 2mm to 5mm, and the pore diameter of the porous sintered glass may be 0.05mm or 0.05mm to 0.5 mm.
In this embodiment, the composite filter plate 4 is formed by stacking an activated carbon-loaded filter paper 10 and porous sintered glass, and the activated carbon-loaded filter paper 10 is close to the detoxification region 3, i.e. the activated carbon-loaded filter paper 10 is loadedThe carbon filter paper 10 is arranged between the detoxification area 3 and the porous sintered glass of the composite filter plate 4. The thickness of the filter paper 10 loaded with the activated carbon can be 0.5mm and 0.4 mm-0.6 mm, the aperture of the filter paper 10 loaded with the activated carbon can be 2 micrometers and 1 micrometer-10 micrometers, and the loading capacity of the activated carbon is 20mg/cm2，10mg/cm2～50mg/cm2All can be used. The thickness of the porous sintered glass of the composite filter plate 4 is 4mm, 3 mm-8 mm, and the aperture of the porous sintered glass of the composite filter plate 4 is 0.1mm, 0.01 mm-0.2 mm.
In this embodiment, the power supply 7 is a programmable dc power supply, and the model is rig l DP1116A, the programmable dc power supply has a current display area capable of displaying current, and the supplied voltage is square-wave pulse voltage. As shown in FIG. 3, the square-wave pulse voltage has a pulse amplitude of +1V/cm, a voltage pulse width B of 2s, and a voltage pulse period T of 4 s. In the invention, the pulse amplitude of the square wave pulse voltage is +0.5V/cm to +2V/cm, the pulse width is 2s to 4s, and the pulse period can be 2s to 8 s.
In this example, the cubic anode region 8 was 60mm 70mm long by wide by high, and the titanium plate in the anode region 8 was 2mm 60mm 90mm long by wide. The length, width, height and size of the cubic filter plate 2 were 3mm 80mm, that is, the square porous sintered glass had a longitudinal sectional size of 80mm, a thickness of 3mm and an average pore size of 0.05 mm. The cylindrical detoxification zone 3 has a circular longitudinal section with a diameter of 70mm and a total length of 120 mm. The length, width, height and height of the cubic composite filter plate 4 are 4.5mm 80mm, the longitudinal section size of the porous sintered glass in the composite filter plate 4 is 80mm, the thickness is 4mm, the average pore size is 0.1mm, the thickness of the filter paper 10 loaded with the activated carbon is 0.5mm, the pore size is 2 μm, and the loading amount of the activated carbon is 20mg/cm2. The cubic cathode region 9 was 60mm by 70mm and the 1050 type aluminum plate in the cathode region 9 was 2mm by 60mm by 90 mm.
Example 2
The electric remediation method for the heavy metal contaminated soil can be implemented by adopting the electric remediation device for the heavy metal contaminated soil of the embodiment 1, and comprises the following steps:
(1) taking viscous soil (clay) which is collected from a place in Hunan and polluted by heavy metal as heavy metal polluted soil to be repaired, wherein the viscous soil (clay) contains 100mg/kg of cadmium (Cd), 0.21g/kg of total nitrogen, 0.13g/kg of total phosphorus, 2.3g/kg of total potassium and 32% of water content, air-drying the heavy metal polluted soil to be repaired until the water content is 8%, sieving the soil with the sieve pore diameter of 3mm, and then adjusting the water content to 26% to obtain the pretreated heavy metal polluted soil.
(2) The pretreated heavy metal contaminated soil obtained in step (1) was loaded into the detoxification zone 3 of the electric restoration apparatus of example 1 and compacted until the density of the heavy metal contaminated soil was 3000g/cm3Then, the electric repairing device in the embodiment 1 is started, the current change of the loop is monitored, the maximum current is less than or equal to 0.2mA, and meanwhile, the anode is supplemented with 9.2mL/d of nutrient solution (the nutrient solution in the embodiment 1). When the loop current is lower than 0.2mA after 5 days of operation, the operation of the device is stopped. After analysis, the cadmium removal rate is 94.32%, while the floc 6 containing aluminum and cadmium is recovered, and the energy spectrum characterization result of the floc 6 is shown in FIG. 4 and Table 1.
TABLE 1 content of the components in the flocs
| Element(s) | Mass ratio% | Mole ratio% |
| Carbon C | 9.18 | 26.28 |
| N-N | 0.92 | 2.24 |
| Oxygen O | 4.01 | 8.62 |
| Aluminum Al | 24.54 | 31.21 |
| Phosphorus P | 9.7 | 10.74 |
| Sulfur S | 6.68 | 7.17 |
| Cadmium Cd | 44.97 | 13.74 |
The following is the analysis of the treatment effect of the electric remediation device and the electric remediation method for the heavy metal contaminated soil of the invention on the cadmium contaminated cohesive soil compared with other methods and devices thereof.
Comparative example 1
The electric prosthetic device of this comparative example 1 is substantially the same as that of example 1 except that: the filter paper in the composite filter plate is not loaded with active carbon. Comparative example 1 heavy metal contaminated soil was treated according to the method of example 2.
Comparative example 2
The electric prosthetic device of this comparative example 2 is substantially the same as that of example 1 except that: the nutrient solution in the anode area is clear water. Comparative example 2 heavy metal contaminated soil was treated according to the method of example 2.
Comparative example 3
The electric prosthetic device of this comparative example 3 is substantially the same as that of example 1 except that: the voltage supplied by the power supply is a constant voltage, not a square pulse voltage. Comparative example 3 heavy metal contaminated soil was treated according to the method of example 2.
As shown in Table 2, the treatment effect on the heavy metal contaminated soil was different for different remediation apparatuses.
TABLE 2 comparison results of indexes of heavy metal contaminated soil under different remediation devices
After the filter paper in the composite filter plate of comparative example 1 is not loaded with activated carbon, the Cd removal efficiency is 40.46%, and compared with examples 1-2, the Cd removal efficiency is reduced by 53.86%. The result shows that the composite filter plate 4 containing the filter paper loaded with the activated carbon forms a micro electric field between the detoxification area 3 and the cathode area 9, and creates an acidic atmosphere, thereby solving the problem of alkaline zone migration and improving the removal efficiency of the heavy metal Cd.
The nutrient solution of the comparative example 2 is replaced by clear water, the Cd removal efficiency is 80.54 percent, and the contents of nutrient elements in the soil are respectively as follows: 0.08g/kg total nitrogen, 0.11g/kg total phosphorus, 1.2g/kg total potassium. Compared with the embodiments 1-2, the Cd removal efficiency and the total nitrogen, total phosphorus and total potassium contents of the nutrient elements are obviously reduced. The result shows that the addition of the anode nutrient solution not only obviously improves the electrokinetic remediation efficiency of the heavy metal contaminated soil, but also solves the problem of soil nutrient element loss caused by electrokinetic remediation.
The square pulse voltage of comparative example 3 was replaced with a constant voltage, and it was 0.024kw.h for power consumption. Compared with the embodiments 1-2, the consumption of electric energy is improved by 118%. The results show that the use of square wave pulse voltage significantly reduces the power consumption during electrodynamic repair.
The foregoing is merely a preferred embodiment of the invention and is not intended to limit the invention in any manner. Although the present invention has been described with reference to the preferred embodiments, it is not intended to be limited thereto. Those skilled in the art can make many possible variations and modifications to the disclosed embodiments, or equivalent modifications, without departing from the spirit and scope of the invention, using the methods and techniques disclosed above. Therefore, any simple modification, equivalent replacement, equivalent change and modification made to the above embodiments according to the technical essence of the present invention are still within the scope of the protection of the technical solution of the present invention.
Claims (10)
1. The electric remediation device for the heavy metal contaminated soil is characterized by comprising a power supply (7) and a body (11), wherein an anode region (8), a detoxification region (3) and a cathode region (9) are sequentially arranged in the body (11), a filter plate (2) is arranged between the anode region (8) and the detoxification region (3), a composite filter plate (4) is arranged between the detoxification region (3) and the cathode region (9), the anode region (8) is connected with the anode of the power supply (7), and the cathode region (9) is connected with the cathode of the power supply (7);
the anode region (8) consists of an anode region polar plate (1) and nutrient solution, the cathode region (9) consists of a cathode region polar plate (5) and buffer solution, the composite filter plate (4) consists of filter paper (10) loaded with activated carbon and porous sintered glass which are stacked, and the filter paper (10) loaded with the activated carbon is close to one side of the detoxification region (3);
the power supply (7) is a programmable direct current power supply which is provided with a current display area, and the voltage provided by the programmable direct current power supply is square wave pulse voltage.
2. The device for electrically repairing heavy metal contaminated soil according to claim 1, wherein the anode region polar plate (1) is composed of a titanium substrate loaded with a catalyst, the titanium substrate is a titanium plate, the mass fraction of titanium in the titanium plate is 87-99%, the catalyst is ruthenium dioxide, and the loading amount of the catalyst is 0.4mg/cm2～0.8mg/cm2(ii) a The anode area polar plate (1) is connected with the anode of a power supply (7), and part of the anode area polar plate (1) is immersed in the nutrient solution.
3. The device for electrokinetic remediation of heavy metal contaminated soil according to claim 1, wherein the cathode zone plate (5) is made of an aluminum material, the aluminum material is an aluminum plate, and the mass fraction of aluminum in the aluminum plate is 92% to 99%; the cathode region polar plate (5) is connected with the negative electrode of the power supply (7), and part of the cathode region polar plate (5) is immersed in the buffer solution.
4. The device for electrokinetic remediation of heavy metal contaminated soil according to claim 1, wherein said nutrient solution is comprised of: 0.2-0.4 mol/L humic acid, 0.1-0.3 mol/L citric acid and 0.05-0.1 mol/L potassium nitrate; and/or the buffer solution is potassium phosphate buffer solution, and the pH value of the buffer solution is 6-9.
5. The device for electrically remedying the heavy metal contaminated soil according to any one of claims 1 to 4, wherein the filter plate (2) is made of porous sintered glass, the thickness of the porous sintered glass is 2mm to 5mm, and the pore diameter of the porous sintered glass is 0.05mm to 0.5 mm.
6. The device for electrically remedying the heavy metal contaminated soil according to any one of claims 1 to 4, wherein the thickness of the activated carbon-loaded filter paper (10) in the composite filter plate (4) is 0.4mm to 0.6mm, the pore diameter of the activated carbon-loaded filter paper (10) is 1 μm to 10 μm, and the loading amount of the activated carbon is 10mg/cm2～50mg/cm2(ii) a The thickness of the porous sintered glass in the composite filter plate (4) is 3 mm-8 mm, and the aperture of the porous sintered glass is 0.01 mm-0.2 mm.
7. The device for electrically restoring the heavy metal contaminated soil according to any one of claims 1 to 4, wherein the square-wave pulse voltage has a pulse amplitude of +0.5V/cm to +2V/cm, a pulse width of 2s to 4s, and a pulse period of 2s to 8 s.
8. An electrokinetic remediation method of heavy metal contaminated soil comprises the following steps:
(1) after the heavy metal contaminated soil is air-dried and sieved, adjusting the water content to 25% -35% to obtain the pretreated heavy metal contaminated soil;
(2) loading the pretreated heavy metal contaminated soil into a detoxification area (3) of an electric remediation device for heavy metal contaminated soil according to any one of claims 1 to 7, compacting, operating the electric remediation device for heavy metal contaminated soil to remediate the pretreated heavy metal contaminated soil, and recovering flocs (6) generated in the cathode area (9) after remediation is completed.
9. The electrokinetic remediation method for heavy metal contaminated soil according to claim 8, wherein in the step (1), the heavy metal contaminated soil is air-dried until the water content is 5% -10%, and the diameter of the sieved sieve pore is 2-4 mm;
and/or in the step (2), the compacted density of the pretreated heavy metal contaminated soil is 2000g/cm3～5000g/cm3(ii) a The maximum current of the repair is less than or equal to 0.2mA, the nutrient solution is supplemented to the anode region (8) in the repair process, and the supplement amount of the nutrient solution is 10L/day/m3Detoxification area of 25L/day/m3In a detoxification area, the repairing time is 3-7 days; the flocculate (6) is a precipitate containing aluminium and heavy metals.
10. The method for electrokinetic remediation of heavy metal-contaminated soil according to claim 8 or 9, wherein the heavy metal in the heavy metal-contaminated soil comprises at least one of cadmium, lead, zinc and copper, and the soil in the heavy metal-contaminated soil is clay and/or silt.
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