CN117380724A - Electric-permeable reactive barrier combined remediation method for heavy metal contaminated soil - Google Patents
Electric-permeable reactive barrier combined remediation method for heavy metal contaminated soil Download PDFInfo
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- CN117380724A CN117380724A CN202311611666.6A CN202311611666A CN117380724A CN 117380724 A CN117380724 A CN 117380724A CN 202311611666 A CN202311611666 A CN 202311611666A CN 117380724 A CN117380724 A CN 117380724A
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- 239000002689 soil Substances 0.000 title claims abstract description 57
- 229910001385 heavy metal Inorganic materials 0.000 title claims abstract description 42
- 230000004888 barrier function Effects 0.000 title claims abstract description 41
- 238000000034 method Methods 0.000 title claims abstract description 33
- 238000005067 remediation Methods 0.000 title claims abstract description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 12
- 239000000440 bentonite Substances 0.000 claims description 44
- 229910000278 bentonite Inorganic materials 0.000 claims description 44
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 claims description 44
- 239000000835 fiber Substances 0.000 claims description 30
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 27
- 239000002131 composite material Substances 0.000 claims description 23
- 230000008439 repair process Effects 0.000 claims description 21
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 18
- 238000002360 preparation method Methods 0.000 claims description 14
- 239000010902 straw Substances 0.000 claims description 13
- 238000001354 calcination Methods 0.000 claims description 12
- 239000002994 raw material Substances 0.000 claims description 12
- 239000004576 sand Substances 0.000 claims description 11
- 238000001816 cooling Methods 0.000 claims description 10
- 239000000945 filler Substances 0.000 claims description 10
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 8
- 239000006004 Quartz sand Substances 0.000 claims description 7
- 239000011230 binding agent Substances 0.000 claims description 7
- 230000008569 process Effects 0.000 claims description 7
- 239000000203 mixture Substances 0.000 claims description 6
- 239000000919 ceramic Substances 0.000 claims description 5
- 238000002156 mixing Methods 0.000 claims description 5
- 239000012299 nitrogen atmosphere Substances 0.000 claims description 5
- 239000011148 porous material Substances 0.000 claims description 4
- 239000004113 Sepiolite Substances 0.000 claims description 2
- 239000004927 clay Substances 0.000 claims description 2
- 239000011361 granulated particle Substances 0.000 claims description 2
- 238000005469 granulation Methods 0.000 claims description 2
- 230000003179 granulation Effects 0.000 claims description 2
- 229910052625 palygorskite Inorganic materials 0.000 claims description 2
- 239000002245 particle Substances 0.000 claims description 2
- 229910052624 sepiolite Inorganic materials 0.000 claims description 2
- 235000019355 sepiolite Nutrition 0.000 claims description 2
- 239000008187 granular material Substances 0.000 claims 1
- 241000196324 Embryophyta Species 0.000 description 23
- 150000002500 ions Chemical class 0.000 description 21
- 240000008042 Zea mays Species 0.000 description 11
- 235000005824 Zea mays ssp. parviglumis Nutrition 0.000 description 11
- 235000002017 Zea mays subsp mays Nutrition 0.000 description 11
- 235000005822 corn Nutrition 0.000 description 11
- 238000003900 soil pollution Methods 0.000 description 6
- 239000012798 spherical particle Substances 0.000 description 6
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 5
- 229910052804 chromium Inorganic materials 0.000 description 5
- 239000011651 chromium Substances 0.000 description 5
- 230000005684 electric field Effects 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- WLZRMCYVCSSEQC-UHFFFAOYSA-N cadmium(2+) Chemical compound [Cd+2] WLZRMCYVCSSEQC-UHFFFAOYSA-N 0.000 description 4
- 238000001035 drying Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000001179 sorption measurement Methods 0.000 description 4
- 238000010276 construction Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 3
- 238000011049 filling Methods 0.000 description 3
- RVPVRDXYQKGNMQ-UHFFFAOYSA-N lead(2+) Chemical compound [Pb+2] RVPVRDXYQKGNMQ-UHFFFAOYSA-N 0.000 description 3
- 238000012954 risk control Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 229910052793 cadmium Inorganic materials 0.000 description 2
- BDOSMKKIYDKNTQ-UHFFFAOYSA-N cadmium atom Chemical compound [Cd] BDOSMKKIYDKNTQ-UHFFFAOYSA-N 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 241001465754 Metazoa Species 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 229910001430 chromium ion Inorganic materials 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000001066 destructive effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000004043 dyeing Methods 0.000 description 1
- 238000009713 electroplating Methods 0.000 description 1
- 230000035558 fertility Effects 0.000 description 1
- 239000003673 groundwater Substances 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910021645 metal ion Inorganic materials 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
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- 230000004048 modification Effects 0.000 description 1
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- 230000008093 supporting effect Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 239000002912 waste gas Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
Classifications
-
- 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
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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 belongs to the technical field of soil and underground water remediation, and particularly relates to an electric-permeable reactive barrier combined remediation method for heavy metal contaminated soil.
Description
Technical Field
The invention belongs to the technical field of soil and groundwater remediation, and particularly relates to an electric-permeable reactive barrier combined remediation method for heavy metal contaminated soil.
Background
With the rapid development of social economy and urban industrialization progress, serious heavy metal pollution problems are brought to soil environments by human industrial production and unreasonable agricultural measures, and particularly, a large amount of waste residues, waste water and waste gas containing heavy metals can be generated in industrial activities such as metallurgy, tanning, dyeing, electroplating, metal processing and the like, and enter the surrounding soil environments in various ways along with the time to cause heavy metal pollution of the soil.
Currently, the global accepted soil heavy metal pollution remediation technology is mainly divided into three types: physical repair, chemical repair, and biological repair. However, three restoration modes have great disturbance to soil components and structures: physical repair is often accompanied by the destruction of soil structures and the reduction of soil fertility; the chemical restoration is easy to cause secondary pollution of soil and underground water, and has great negative influence on physicochemical properties and nutrients of the soil, so that the secondary utilization of the soil is difficult; bioremediation is also destructive to the soil during the maintenance of the soil environment due to the harsh requirements of animals, plants and microorganisms on the soil environment.
The electric repair technology is used as an efficient and green in-situ soil repair method, has low disturbance to the soil, and can lead the polluted ions in the soil to directionally migrate under the action of electric field force on the basis of not influencing the original ecological environment of the soil, thereby achieving the purpose of removal. However, the focusing and backflow phenomena of heavy metals are found in the research process, so that the removal rate of the heavy metals in the electric remediation technology is seriously influenced, and therefore, the research on a low-disturbance efficient remediation method for the heavy metal contaminated soil is very necessary.
Disclosure of Invention
Aiming at the technical problems in the prior art, the invention provides an electric-permeable reactive barrier combined remediation method for heavy metal contaminated soil, which couples the electric remediation of the contaminated soil and the permeable reactive barrier remediation together, and adsorbs, precipitates or oxidizes heavy metal pollutants enriched around an electrode plate in the electric remediation process through the permeable reactive barrier, thereby realizing the low-disturbance rapid and high-efficiency remediation of the heavy metal contaminated soil.
In order to achieve the above purpose, the embodiment of the invention adopts the following technical scheme:
an anode electrode and a cathode electrode are arranged in the polluted area, a permeable reaction wall perpendicular to the ground is arranged between the cathode electrode and the anode electrode and at a distance of 0.2-0.5 m from the cathode electrode, and the soil in the polluted area is restored by switching on a power supply.
Compared with the prior art, the electric-permeable reactive barrier combined restoration method for the heavy metal contaminated soil provided by the invention couples the restoration of the permeable reactive barrier with the electric restoration, and pushes heavy metal ions in the soil to migrate towards the cathode through a parallel electric field generated between the cathode electrode and the anode electrode, and the permeable reactive barrier is utilized to adsorb and fix the moving heavy metal ions in the migration process of the heavy metal ions, so that the high-efficiency removal of the heavy metal ions is achieved, and the disturbance of the whole restoration process on soil components and structures is small, thus the method has a good application prospect.
Preferably, the filler of the permeable reactive barrier is divided into five layers along the direction vertical to the ground, wherein the first layer and the fifth layer are quartz sand, the second layer and the fourth layer are bentonite modified plant fibers, and the third layer is a composite material loaded with zero-valent iron.
Compared with the prior art, the permeable reactive barrier filler provided by the invention has the advantages that the structure is stable, the adsorption performance of heavy metal ions is outstanding, the quartz sand on the outermost layer has excellent adsorption performance on the heavy metal ions, the physical property and the chemical property are stable, the influence of external factors such as pollutants, temperature and pH is avoided, and the permeable reactive barrier filler has a certain supporting effect on the whole filler system; the bentonite modified fiber has a certain permeability besides the heavy metal ion adsorption capacity, and can ensure the trafficability of heavy metal ions while bonding a quartz sand layer and a composite material layer loaded with zero-valent iron; the zero-valent iron has the characteristics of higher surface area and strong reactivity, and the higher reduction potential has outstanding removal effect on metal ions such as chromium, lead, cadmium and the like, and is used as the core of the filler to control the whole repair effect.
Preferably, the bentonite modified plant fiber is prepared from the following raw materials in parts by weight: 10-20 parts of bentonite and 30-50 parts of straw plant fiber. Further preferably, the preparation method of the bentonite modified plant fiber comprises the following steps: and (3) crushing the straw plant fibers to 100-200 meshes, uniformly mixing the crushed straw plant fibers with bentonite, and performing pyrolysis in a nitrogen atmosphere for 40-60 min to obtain the bentonite modified plant fibers.
Compared with the prior art, the bentonite modified plant fiber provided by the invention adopts the straw as the main raw material, is easy to obtain, wide in source and low in cost, and can be pyrolyzed after being uniformly mixed with the bentonite, so that on one hand, the porous structure of the straw plant fiber can be reserved, and on the other hand, the specific surface area of the bentonite can be improved, and the adsorption capacity and permeability of the finally prepared bentonite modified plant fiber can be improved.
Preferably, the preparation raw materials of the zero-valent iron composite material comprise the following raw materials in parts by mass: 10-20 parts of zero-valent iron, 20-30 parts of activated carbon, 20-30 parts of binder and 10-20 parts of porous material; wherein the binder is at least one of bentonite or clay; the porous material is one of porous ceramic, palygorskite or sepiolite.
Preferably, the preparation method of the zero-valent iron composite material comprises the following steps: and uniformly mixing the raw materials according to a proportion, adding water to the water content of 60-80%, granulating, and calcining to obtain the zero-valent iron composite material.
Preferably, the preparation process of the zero-valent iron composite material further comprises the steps of covering fine sand on the surface of the granulated particles after granulation, and drying at 80-100 ℃.
Preferably, the calcination process in the preparation process of the zero-valent iron composite material is as follows: granulating, cooling the dried particles to room temperature, covering fine sand on the surface, calcining for 0.5-1 hour at 500-700 ℃, and cooling to obtain the filling material.
The fine sand is covered on the surface of the composite material in the granulating and calcining processes, so that the mutual adhesion between the composite materials can be avoided, the structure and mechanical properties of the material are ensured, the drying temperature and the calcining temperature are optimized, the drying and calcining speeds are ensured, the raw material deterioration can be avoided, and the yield is improved.
Detailed Description
The present invention will be described in further detail with reference to the following examples in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Example 1
The embodiment provides a method for repairing heavy metal contaminated soil, wherein the ph=8.0 of the contaminated soil, and the concentration of chromium (hexavalent) ions is as follows: 95.6mg/kg, lead ion concentration: 3033mg/kg, the cadmium ion concentration is: 198.6mg/kg, which are beyond the control value range of the second type of land in the soil pollution risk control Standard of soil environmental quality construction land:
the repair method adopts the electric-permeable reactive barrier combined repair, and comprises the specific steps that 10m of cathode electrode plates and 10m of anode electrode plates are arranged in parallel perpendicular to the ground in a soil pollution area, wherein the distance between the cathode electrode plates and the anode electrode plates is 15m, the permeable reactive barrier which is parallel to the cathode electrode plates and has the length of 10m, the thickness of 1.5m and the depth of 10m is arranged between the cathode electrode plates and the anode electrode plates at the position 0.3m away from the cathode electrode plates, wherein the filler of the permeable reactive barrier is divided into 5 layers with the same thickness along the direction perpendicular to the ground, the first layer and the fifth layer are quartz sand, the second layer and the fourth layer are bentonite modified plant fibers, and the third layer is a composite material loaded with zero-valent iron, and the thickness of each layer is 0.1m.
The bentonite modified plant fiber is prepared from bentonite and corn straw, wherein the bentonite comprises 20 parts of bentonite and 50 parts of corn straw, and the preparation method of the bentonite modified plant fiber comprises the following steps: after the corn stalk is crushed to 200 meshes, the corn stalk and bentonite are uniformly mixed according to the mass parts, the mixture is transferred into a tube furnace, and the mixture is pyrolyzed for 60 minutes at 600 ℃ under the nitrogen atmosphere, and the bentonite modified plant fiber is obtained after cooling.
The preparation raw materials of the zero-valent iron composite material comprise the following components in parts by mass: 15 parts of zero-valent iron, 25 parts of active carbon, 25 parts of binder bentonite and 15 parts of porous ceramic, after being uniformly mixed according to the parts by weight, adding water until the water content is between 60% and 80%, transferring into a granulator to prepare spherical particles with the diameter less than or equal to 5mm, covering the surfaces of the spherical particles with fine sand, drying in a vacuum box at 80 ℃ for 1h, cooling to room temperature, continuously covering the surfaces with the fine sand, and calcining for 0.5h at 600 ℃ in a muffle furnace to obtain the zero-valent iron composite material.
After the materials are sequentially filled into the permeable reactive barrier, an electric field of 2V/m is formed between the cathode electrode plate and the anode electrode plate by electrifying, so that ions between the cathode electrode plate and the anode electrode plate directionally move, and heavy metal ions concentrated to the cathode are intensively adsorbed and treated by the filler in the permeable reactive barrier.
Example 2
The embodiment provides a method for repairing heavy metal contaminated soil, wherein the ph=8.0 of the contaminated soil, and the concentration of chromium (hexavalent) ions is as follows: 98.7mg/kg, lead ion concentration: 2832mg/kg, cadmium ion concentration is: 225.3mg/kg, which are beyond the control value range of the second type of land in the soil pollution risk control Standard of soil environmental quality construction land:
the repair method adopts the electric-permeable reactive barrier combined repair, and comprises the specific steps that 10m of cathode electrode plates and 10m of anode electrode plates are arranged in parallel in a soil pollution area, wherein the distance between the cathode electrode plates and the anode electrode plates is 15m, the permeable reactive barrier which is parallel to the cathode electrode plates and has the length of 10m, the thickness of 1.5m and the depth of 10m is arranged between the cathode electrode plates and the anode electrode plates at the position 0.5m away from the cathode electrode plates, wherein the filling of the permeable reactive barrier is divided into 5 layers with equal thickness along the direction vertical to the ground, the first layer and the fifth layer are quartz sand, the second layer and the fourth layer are bentonite modified plant fibers, and the third layer is a composite material loaded with zero-valent iron, and the thickness of each layer is 0.1m.
The bentonite modified plant fiber is prepared from 15 parts of bentonite and 40 parts of corn straw, wherein the preparation method of the bentonite modified plant fiber comprises the following steps: after the corn stalk is crushed to 100 meshes, the corn stalk is uniformly mixed with bentonite according to the mass parts, the mixture is transferred into a tube furnace to be pyrolyzed for 50 minutes at 500 ℃ under the nitrogen atmosphere, and the bentonite modified plant fiber is obtained after cooling.
The preparation raw materials of the zero-valent iron composite material comprise the following components in parts by mass: the preparation method comprises the steps of uniformly mixing 20 parts of zero-valent iron, 30 parts of activated carbon, 30 parts of binder bentonite and 20 parts of porous ceramic according to parts by weight, adding water until the water content is between 60% and 80%, transferring to a granulator to form spherical particles with the diameter less than or equal to 5mm, covering the surfaces of the spherical particles with fine sand, driving in a vacuum box at 80 ℃ for 1h, cooling to room temperature, continuously covering the surfaces with the fine sand, and calcining at 600 ℃ for 0.5h in a muffle furnace to obtain the zero-valent iron composite material.
After the materials are sequentially filled into the permeable reactive barrier, an electric field of 1.5V/m is formed between the cathode electrode plate and the anode electrode plate by electrifying, so that ions between the cathode electrode plate and the anode electrode plate are directionally moved, and heavy metal ions concentrated to the cathode are intensively adsorbed and treated by the filler in the permeable reactive barrier.
Example 3
The embodiment provides a method for repairing heavy metal contaminated soil, wherein the ph=7.5 of the contaminated soil, and the concentration of chromium (hexavalent) ions is as follows: 115.8mg/kg, lead ion concentration: 2785mg/kg, cadmium ion concentration: 204.8mg/kg, which are beyond the control value range of the second type of land in the soil pollution risk control Standard of soil environmental quality construction land:
the repair method adopts the electric-permeable reactive barrier combined repair, and comprises the specific steps that 10m of cathode electrode plates and 10m of anode electrode plates are arranged in parallel in a soil pollution area, wherein the distance between the cathode electrode plates and the anode electrode plates is 10m, the permeable reactive barrier which is parallel to the cathode electrode plates and has the length of 10m, the thickness of 2.5m and the depth of 10m is arranged between the cathode electrode plates and the anode electrode plates at the position 0.5m away from the cathode electrode plates, wherein the filling of the permeable reactive barrier is divided into 5 layers with equal thickness along the direction vertical to the ground, the first layer and the fifth layer are quartz sand, the second layer and the fourth layer are bentonite modified plant fibers, and the third layer is a composite material loaded with zero-valent iron, and the thickness of each layer is 0.1m.
The bentonite modified plant fiber is prepared from bentonite and corn straw, wherein the bentonite comprises 20 parts of bentonite and 50 parts of corn straw, and the preparation method of the bentonite modified plant fiber comprises the following steps: after the corn stalk is crushed to 200 meshes, the corn stalk and bentonite are uniformly mixed according to the mass parts, the mixture is transferred into a tube furnace, and the mixture is pyrolyzed for 60 minutes at 600 ℃ under the nitrogen atmosphere, and the bentonite modified plant fiber is obtained after cooling.
The preparation raw materials of the zero-valent iron composite material comprise the following components in parts by mass: 15 parts of zero-valent iron, 25 parts of active carbon, 25 parts of binder bentonite and 15 parts of porous ceramic, after being uniformly mixed according to the parts by weight, adding water until the water content is between 60% and 80%, transferring into a granulator to form spherical particles with the diameter less than or equal to 5mm, covering the surfaces of the spherical particles with fine sand, driving in a vacuum box at 80 ℃ for 1h, cooling to room temperature, continuously covering the surfaces with the fine sand, and calcining at 600 ℃ for 0.5h in a muffle furnace to obtain the zero-valent iron composite material.
After the materials are sequentially filled into the permeable reactive barrier, an electric field of 1V/m is formed between the cathode electrode plate and the anode electrode plate by electrifying, so that ions between the cathode electrode plate and the anode electrode plate are directionally moved, and heavy metal ions concentrated to the cathode are intensively adsorbed and treated by the filler in the permeable reactive barrier.
Test case
After 30 days of energization, the soil in the treatment areas in examples 1 to 3 was randomly sampled, each area was sampled 10 times, the concentrations of chromium ions, lead ions and cadmium ions in the restored soil were measured, and the average value and the removal rate were calculated, with the results shown in the following table:
the detection result shows that the electric-permeable reactive barrier combined restoration method for the heavy metal contaminated soil provided by the invention can realize concentrated removal of heavy metal ions in the soil while ensuring the original structure and physicochemical properties of most of the contaminated soil, has small disturbance to the soil, has high-efficiency removal effect on heavy metal ions such as chromium, lead, cadmium and the like, and has short restoration period and high efficiency.
The foregoing description of the preferred embodiments of the invention is not intended to limit the invention to the particular embodiments disclosed, but on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.
Claims (10)
1. An electric-permeable reactive barrier combined remediation method for heavy metal contaminated soil is characterized in that an anode electrode and a cathode electrode are arranged in a contaminated area, a permeable reactive barrier perpendicular to the ground is arranged between the cathode electrode and the anode electrode at a distance of 0.2-0.5 m from the cathode electrode, and the soil in the contaminated area is remediated by switching on a power supply.
2. The method for combined repair of electro-permeable reactive barrier in heavy metal contaminated soil according to claim 1, wherein the filler of the permeable reactive barrier is divided into 5 layers in a direction perpendicular to the ground, wherein the first layer and the fifth layer are quartz sand, the second layer and the fourth layer are bentonite modified plant fibers, and the third layer is a composite material loaded with zero-valent iron.
3. The method for the combined repair of the electric-permeable reactive barrier of the heavy metal contaminated soil according to claim 2, wherein the bentonite modified plant fiber is prepared from the following raw materials in parts by mass: 10-20 parts of bentonite and 30-50 parts of straw plant fiber.
4. The method for the combined repair of the electrokinetic-permeable reactive barrier of the heavy metal contaminated soil according to claim 3, wherein the bentonite modified plant fiber is prepared by the following steps: and (3) crushing the straw plant fibers to 100-200 meshes, uniformly mixing the crushed straw plant fibers with bentonite, and pyrolyzing the mixture in a nitrogen atmosphere for 40-60 min to obtain the bentonite modified plant fibers.
5. The method for the combined repair of the electric-permeable reactive barrier of the heavy metal contaminated soil according to claim 2, wherein the preparation raw materials of the zero-valent iron composite material comprise the following components in parts by mass: 10-20 parts of zero-valent iron, 20-30 parts of activated carbon, 20-30 parts of binder and 10-20 parts of porous material.
6. The method for the combined electro-permeable reactive barrier repair of heavy metal contaminated soil according to claim 5, wherein the binder is at least one of bentonite or clay.
7. The combined electro-permeable reactive barrier repair method for heavy metal contaminated soil according to claim 5, wherein the porous material is one of porous ceramics, palygorskite, or sepiolite.
8. The method for the combined repair of the electro-permeable reactive barrier of the heavy metal contaminated soil according to any one of claims 5 to 7, wherein the preparation method of the zero-valent iron composite material is as follows:
and uniformly mixing the raw materials according to a proportion, adding water to the water content of 60-80%, granulating, and calcining to obtain the zero-valent iron composite material.
9. The combined electro-permeable reactive barrier restoration method for heavy metal contaminated soil according to claim 8, wherein the surface of the granulated particles is covered with fine sand after the granulation is completed, and the particles are dried in a vacuum environment at 80 to 100 ℃.
10. The combined electro-permeable reactive barrier repair method for heavy metal contaminated soil according to claim 9, wherein the calcination process is: granulating, cooling the dried granules to room temperature, covering fine sand on the surface, calcining for 0.5-1 hour at 500-700 ℃, and cooling to obtain the zero-valent iron composite material.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117548477A (en) * | 2024-01-12 | 2024-02-13 | 自然资源部第二海洋研究所 | Sediment heavy metal pollution restoration method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117548477A (en) * | 2024-01-12 | 2024-02-13 | 自然资源部第二海洋研究所 | Sediment heavy metal pollution restoration method |
| CN117548477B (en) * | 2024-01-12 | 2024-04-09 | 自然资源部第二海洋研究所 | Sediment heavy metal pollution restoration method |
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