45 results about "Electrokinetic remediation" patented technology

A method for synchronously remediating organically contaminated soil and groundwater by means of electrokinetic coupled multiphase extraction. Cathode wells and anode wells are distributed in a staggered manner in an area to be remediated; a pipe filled with an electrolyte is inserted into each of the cathode wells and the anode wells; an extraction pipe is inserted into each cathode well; electrodes are connected to an electrokinetic remediation system; the extraction pipes are connected to a multiphase extraction system; by means of electrokinetic remediation, persulfate anions in a catholyte are injected into a stratum from the cathode wells and are then migrated to an anode by means of the action of electromigration, iron ions released by a sacrificial anode in an anolyte are migrated to a cathode by means of the action of electromigration and electrodialysis, and persulfate in soil and groundwater are activated during "opposite-direction" migration; then, the direction of an electric field is switched, and at the same time, electrolytes are added to corresponding electrode wells for "opposite-direction" migration, and remediation treatment is performed according to the above electrode-based remediation method and an electrode-based remediation method in which an electrode direction is switched, until organically contaminated soil and groundwater in the area to be treated are completely remediated at the same time; and the multiphase extraction system is started after the electrode-based remediation, and the electrolytes in the electrode wells are depleted. Further disclosed is the use of the method for synchronously remediating organically contaminated soil and groundwater by means of electrokinetic coupled multiphase extraction in in-situ remediation of organically contaminated soil.

The application discloses a new device for pre-acidification process combined with cathode buffer zone electric dynamic remediation of heavy metal contaminated soil and a construction method, and belongs to the field of electric dynamic remediation of heavy metal contaminated soil. The device comprises a soil remediation chamber and a sewage treatment chamber. The soil remediation chamber is open at the top, is provided with an anode plate on one side, and is provided with a cathode plate on the opposite side. Filter paper is attached to the two sides of the anode plate and the cathode plate. The cathode plate is further provided with a cathode buffer chamber opposite the anode plate. The anode plate and the cathode plate are connected through wires, a power supply and a sensor. The soil remediation chamber is connected with the sewage treatment chamber on the side provided with the cathode plate, and a gap is formed between the soil remediation chamber and the sewage treatment chamber to allow liquid to flow from the soil remediation chamber into the sewage treatment chamber. The sewage treatment chamber is provided with adsorption material. The sewage treatment chamber is provided with a drainage hole and a drainage pipe at the bottom end. The method can effectively remove heavy metals in sewage and can avoid the possibility of secondary pollution of the environment caused by electric dynamic remediation of sewage.

The invention belongs to the technical field of soil heavy metal treatment, and relates to a floater-loaded electrooxidation electrokinetic remediation device and a paddy field soil heavy metal removal method, the electrokinetic remediation device comprises a floating module, a power supply arranged in the floating module, and an anode electrode and a cathode electrode which are respectively connected with the anode and the cathode of the power supply; the anode electrode comprises an electrode core rod and an iron layer arranged outside the electrode core rod; the removing method comprises the steps that the floater-loaded electrooxidation electrokinetic remediation device is unloaded into overlying water of a paddy field to be remedied, the anode electrode and the cathode electrode are immersed, and heavy metal ions are adsorbed through electrode reaction. Compared with the prior art, heavy metal can be collected while heavy metal desorption of the paddy field soil is achieved, the follow-up treatment cost of the heavy metal is reduced, and the purpose of in-situ, low-energy-consumption and low-cost remediation of the paddy field soil polluted by the heavy metal is achieved.

The invention relates to the field of environmental protection engineering construction, and discloses a river and lake water body-bottom mud in-situ electrokinetic remediation system which comprises a plurality of electrode tubes, electrodes, a direct-current power supply and a wire, and the number of the electrode tubes and the number of the electrodes are equal and are both even; the electrode tube comprises an electrolyte chamber, a clay chamber, a repair chamber, a filter screen, a fixing buckle, a sealing cover, supporting legs and an overflow hole; the chamber of the electrode tube comprises one or more of an electrolyte chamber, a clay chamber and a repair chamber and at least comprises the repair chamber, and supporting legs are arranged below the electrode tube; the electrode is arranged in the electrolyte cavity, one end of the electrode is connected with a direct-current power supply through a wire, and supporting legs of an electrode tube are inserted into the lower lying layer; according to the invention, synchronous or asynchronous electrokinetic remediation of river and lake water and bottom mud pollutants is realized, the global dosage is reduced, and the excessive risk of chemical remediation is avoided.

The utility model discloses a device for electrokinetic remediation of heavy metal contaminated soil, which comprises an electrolysis chamber and a power supply, and an anode chamber and a cathode chamber are respectively arranged on two opposite sides in the electrolysis chamber; an anode plate is arranged in the anode chamber, a cathode plate is arranged in the cathode chamber, and the anode plate and the cathode plate are respectively connected with a power supply; an anion permeable membrane is vertically arranged on the side, close to the cathode chamber, in the electrolysis chamber, and the anode chamber and the cathode chamber are located on the two opposite sides of the anion permeable membrane respectively. According to the device for electrokinetic remediation of the heavy metal contaminated soil, metal precipitates are gathered on one side of the anion permeable membrane and located outside the cathode chamber, a dosing pipe of the cathode chamber cannot be affected, pipe loss is reduced, and electrokinetic remediation efficiency is improved.

The present invention relates to the technical field of soil remediation, in particular to a technical method for controlling electroosmotic flow in electrokinetic remediation. The steps are as follows: (1) Test the zeta potential of the target soil under the original pH condition and judge the direction of electroosmotic flow; (2) Install an electrokinetic remediation device and cathode and anode liquid circulation pumps; (3) Adjust the flow rates of the cathode and anode circulation pumps according to the positive and negative values of the soil zeta potential. The present invention solves the technical problem that it is difficult to control the direction and magnitude of electroosmotic flow during electrokinetic remediation, thereby improving the electrokinetic remediation efficiency of heavy metal contaminated soil.

The invention discloses an automatic blowdown electrokinetic remediation device and method coupling electrolysis gas production pressurization and siphoning. The device comprises a siphoning upward-discharging type conductive drainage plate, a direct-current stabilized power supply and a vacuum self-priming pump. The siphon upward-drainage type conductive drainage plate is made of a flexible material and comprises a vertical drainage plate, a top end U-shaped plate and a flexible water guide pipe. Vertical water guide grooves are formed in the surfaces of the vertical drainage plates, vertical water guide pipes are arranged in the vertical drainage plates, and bottom water storage grooves are formed in the bottoms; the flexible water guide pipe is connected with the top end U-shaped plate and the vacuum self-sucking pump; the bottom water storage tank is communicated with the vertical water guide grooves and the vertical water guide pipes and used for collecting the soil pore water solution guided by the vertical water guide grooves, conveying the soil pore water solution to the top end U-shaped plate from the vertical water guide pipes under internal electrolysis gas production pressurization and external vacuum negative pressure, and meanwhile discharging the soil pore water solution to the flexible water guide pipes under the siphoning action of the top end U-shaped plate. The problems that existing polluted soil / bottom mud electric guiding, discharging and repairing are tedious in procedure, difficult to overhaul, large in workload, high in cost and the like are solved.

The application belongs to the field of soil heavy metal remediation, and particularly relates to a carbon cloth supported polypyrrole / graphene oxide / zinc oxide auxiliary electrode for soil remediation and a preparation method thereof. A PPy / GO / ZnO ternary composite cluster 3D network structure material is prepared first; then the carbon cloth is soaked in a PPy / GO / ZnO ternary composite cluster 3D network structure material suspension, and is put into a reaction kettle to react to obtain an auxiliary electrode, which is put into a traditional electromotive remediation system to remediate various heavy metal contaminated soils by electrification. The addition of the auxiliary electrode can reduce the ion migration resistance in the soil system, improve the system current, accelerate the migration speed of heavy metal ions in the electromotive remediation system, make the electric field distribution more uniform, and produce a greater potential difference. Compared with the traditional electromotive remediation, the remediation efficiency is increased by 21% to 35%. The maximum removal rate of Pb, Cr, Cd, Cu and Ni reaches 57% to 90%.

The present application relates to a kind of microbial combined electric repair method for removing soil Cd, using electric repair contaminated soil device, the device includes soil chamber, anode chamber and cathode chamber at both ends of soil chamber, anode chamber and cathode chamber are equipped with anode plate, cathode plate respectively, direct current stabilized power supply is equipped between anode plate and cathode plate, soil chamber is equipped with solid-liquid separation baffle between anode chamber and cathode chamber, including the following steps: S1, fill Cd contaminated soil in soil chamber, add electrolyte solution to Cd contaminated soil, cover soil upper surface, soak 20-30h;S2, add organic acid buffer solution to cathode chamber;S3, input direct current;S4, filamentous fungi are inoculated in soil close to cathode region, repair 7-9d;S5, remove filamentous fungi from soil, complete the repair of contaminated soil.The present application makes Cd in soil migrate to soil close to cathode region, filamentous fungi enrich heavy metal Cd, after removing filamentous fungi, make soil Cd concentration reach farmland soil standard.

The invention discloses a method for removing anions in soil and underground water through electrokinetic remediation-in-situ electrochemical green rust production adsorption coupling. An electrokinetic remediation unit and an electric flocculation unit located on a device are included. According to the electrokinetic remediation-electric flocculation coupling, a periodic square wave power supply is adopted to control two units to work alternately, and a square wave periodic power supply mode with different duty ratios of EC and EK is adopted, so that the removal efficiency of anions is improved, and the energy consumption of working units is reduced; the anode of the electric flocculation unit is doped with magnesium and zinc, Fe < 2 + > electrolysis is promoted, the green rust yield and stability are improved, and the efficiency of capturing and removing anions is further promoted; the cathode of the electric flocculation unit has a high local pH value, precipitates or micro-precipitates are generated with cations generated by electrolysis to pre-capture anions, and the anions are deposited to the bottom of the electric flocculation unit to further promote the removal efficiency of the anions and provide a smooth path for subsequent migration and capture of the anions at the same time.

The invention discloses a three-dimensional electrokinetic remediation device and application thereof. The device is of a box type structure; the electrokinetic remediation electrolytic tanks are arranged at the two ends of the device, and electrodes and an electrolyte solution are arranged in the electrokinetic remediation electrolytic tanks; the cathode, the anode and the auxiliary electrolyte cavity are arranged between the electrokinetic remediation electrolytic tanks, and the soil column pipe and the auxiliary electrolyte cavity are MnFe2O4 coated GBC; the solute in the electrolyte solution is chitosan salt, Tween X-100 and hydrogen peroxide. The problems that existing biochar only serves as a passive cathode and lacks catalytic sites, and a two-dimensional electrode structure is uneven in electric field distribution and difficult to recycle are solved, MnFe2O4-coated GBC serves as an auxiliary electrode, a three-dimensional electrode structure is constructed, and a customized composite electrolyte is combined, so that the migration ability of pollutants is enhanced, and the service life of the pollutants is prolonged. Fenton-like degradation of organic chlorine pollutants can be promoted, and the remediation efficiency and the treatment uniformity are remarkably improved.

The present application relates to soil remediation and improvement technical field, especially to a kind of method for soil fertility recovery after soil electrokinetic remediation and application thereof, comprising the following steps: soil basic parameter detection: the soil after electrokinetic remediation is zoned, and the pH value, alkali-dissolving nitrogen, available phosphorus, available potassium content and moisture content of each region soil are detected respectively;pH precision regulation: according to the pH value of each regional soil, pH is adjusted using differential reagent, to reach the suitable growth interval of crops;Quasi-nutrient supplement: based on the nutrient deficiency amount of detection analysis, combined with the nutrient amount brought in during pH adjustment process, calculate and supplement nitrogen, phosphorus and potassium fertilizer;Add soil conditioner to soil, mix evenly after ploughing, adjust soil moisture content, cover film maintenance, complete soil fertility recovery.The present application effectively solves the problem that traditional technology cannot zoned differential regulation of electrokinetic remediation soil acid and alkali, pH adjustment, nutrient supplement and structure improvement cannot be synchronized, fertility recovery is slow, and farmland reclamation is lagging behind.

The invention belongs to the technical field of water treatment, and discloses a plant coupling electrokinetic remediation and auxiliary agent in-situ treatment system for coastal shallow water type lake and reservoir bottom mud. Comprising a phytoremediation unit, an electrokinetic remediation unit, a feeding unit and an auxiliary unit. Through establishment of an aquatic plant-electrokinetic remediation-medicament-assisted bottom mud in-situ treatment technology integration system and a prediction model capable of guiding application of the technology integration system, an innovative solution which gives consideration to environmental protection, economical efficiency and applicability is provided for treatment of coastal shallow water type lake and reservoir bottom mud endogenous pollution.

The application discloses a method for simultaneously repairing organic contaminated soil and underground water by electric coupling and multi-phase extraction. Cathode and anode wells are arranged in the area to be repaired in a staggered manner, electrolyte-filled tubes are inserted into the cathode and anode wells, an extraction tube is inserted into the cathode well, the electrodes are connected to an electric repair system, and the extraction tube is connected to a multi-phase extraction system. Through the electric repair, persulfate anions in the cathode electrolyte are injected into the stratum from the cathode well, and are migrated to the anode through the electromigration effect. Iron ions released from the sacrificial anode in the anode electrolyte are migrated to the cathode through the electromigration and electrodialysis effects. In the "opposite" migration, the persulfate in the soil and underground water is activated. Then, the electric field direction is switched, and electrolyte is added into the corresponding electrode wells to perform the "opposite" migration. The repair is performed according to the above electrode repair and electrode repair with the electrode direction switched. The application can realize the simultaneous and efficient repair and detoxification of the composite organic contaminated soil and underground water.

The invention provides environment restoration type electric reinforced permeable reactive barrier equipment which comprises a permeable reactive barrier, an anode well and a cathode well, the anode well and the cathode well are arranged on the two sides of the permeable reactive barrier respectively, an anode control box is installed on the top of the anode well, a cathode control box is installed on the top of the cathode well, and the anode control box is connected with the cathode control box. A high-precision adjustable direct-current stabilized power supply is arranged at the top of the permeable reactive barrier, and the anode control box and the cathode control box are both connected with the high-precision adjustable direct-current stabilized power supply; the permeable reactive barrier comprises a soil chamber, two PRB chambers and two electrode chambers, and electrode plates are mounted in the electrode chambers through electrode clamps; the advantages of the two technologies are combined, pollutants can be pushed to the PRB through electromigration and electroosmosis of electrokinetic remediation, the removal efficiency of the pollutants is improved, the pollutants can be further treated through the physical, chemical or biological action process of the PRB, and therefore the better remediation effect is achieved.

The invention discloses a method for repairing hexavalent chromium contaminated soil through combination of a composite activator and electrodynamic force, and belongs to the technical field of heavy metal contaminated soil repairing. Comprising the following steps: air-drying hexavalent chromium polluted soil, sieving to remove impurities, and mixing by using a drum mixer to obtain a uniform soil sample; the method comprises the following steps: filling a soil sample into a soil remediation tank, slowly adding a composite soil activator solution formed by mixing tartaric acid with the concentration of 0.1 mol / L and potassium chloride with the concentration of 0.04-0.06 mol / L into the soil until the soil is completely infiltrated, and performing electrokinetic remediation on the soil sample infiltrated with the composite soil activator solution until the remediation is finished. According to the method, the hexavalent chromium contaminated soil is remedied through combination of low-molecular organic acid and potassium chloride and electrokinetic remediation, the removal efficiency of hexavalent chromium is remarkably improved, the remedied soil can reach the national standard first-class land use screening value, damage to the soil structure and secondary pollution are avoided, meanwhile, the effect of improving alkaline soil is achieved, and the method is suitable for large-scale popularization and application. Good popularization and application prospects are realized.

The present application belongs to the field of electrokinetic remediation of heavy metal contaminated soil, and particularly relates to a method for in-situ electrokinetic remediation of heavy metal contaminated soil. Specifically, a hollow functional material with an inner cavity is pre-embedded in the middle transition zone of the contaminated soil area to be treated; a direct current electric field is applied to both ends of the contaminated soil area to be treated, which drives the migration of heavy metal ions in the initial anode region to the middle transition zone, promotes the aggregation of colloids in the zone, compresses the soil pores, and forms an ion bypass channel with the inner cavity of the hollow functional material; when the physicochemical characteristics of the middle transition zone reach the threshold condition, the polarity of the electrodes at both ends of the contaminated soil area to be treated is switched; the reverse electric field promotes the migration of heavy metal ions in the initial cathode direction to the bypass channel formed above, and in-situ enrichment and stable remediation are realized with the counter-migrating stabilized ions in the bypass channel. The method breaks through the mass transfer limitation of traditional electrokinetic remediation, and realizes efficient spatial enrichment and synchronous stabilization of heavy metals.

The application relates to the technical field of soil remediation, in particular to a Fe3O4-CNT / MgO-ATP / SA electrode material and application thereof. The conventional auxiliary electrode used in the electrokinetic remediation technology has poor mechanical performance and poor removal effect on heavy metal ions in the soil. In view of the above problems, the application provides a Fe3O4-CNT / MgO-ATP / SA electrode material, which is obtained by encapsulating modified MgO attapulgite rod soil and Fe3O4 magnetized carbon nanotubes in a crosslinked network structure formed by sodium alginate to obtain an auxiliary electrode material. The obtained auxiliary electrode material has good conductivity, environmental protection and corrosion resistance. The MgO-ATP in the auxiliary electrode material has good adsorption capacity for heavy metal ions. The Fe3O4-CNT endows the auxiliary electrode material with excellent conductivity. The crosslinked network structure of the auxiliary electrode material has good mechanical strength and stability.

The utility model belongs to the technical field of river and lake bottom mud remediation, and discloses a heavy metal polluted bottom mud in-situ electric remediation device which comprises a double-layer isolation cover, the cathode module is arranged at one end of the bottom of the double-layer isolation cover and comprises a cathode protection cover, the interior of the cathode protection cover is divided into a first cavity and a second cavity through a partition plate with holes, a cation exchange membrane and a cathode electrode are arranged in the first cavity, and a heavy metal adsorption material is arranged in the second cavity; the cathode module is arranged at the other end of the bottom of the double-layer isolation cover and comprises an anode protection cover, and an anode electrode is arranged in the anode protection cover; the cathode protection cover and the anode protection cover are made of insulating hard materials with holes, and the anode electrode and the cathode electrode are connected with a power source through waterproof wires respectively. And the electrolyte supply device is used for conveying acidic electrolyte to the cathode protection cover. The in-situ electrokinetic remediation device for the heavy metal polluted bottom mud is good in remediation effect.

This invention belongs to the field of electrokinetic remediation of heavy metals in soil, specifically relating to a method for preparing and applying an auxiliary electrode made of PANI@monolayer graphene oxide / MWCNT material. This invention functionalizes two carbon materials by acid treatment with hydrochloric acid, and then synthesizes polyaniline from aniline and loads it onto the polyaniline to form the auxiliary electrode. The carbon materials are monolayer graphene oxide and MWCNT (multi-walled carbon nanotubes). Under the synergistic effect of the acid-modified monolayer graphene oxide, MWCNT, and PANI, the auxiliary electrode exhibits higher structural stability and superior electrochemical properties, resulting in a longer high-stability time for electrokinetic remediation. The auxiliary electrode prepared using this method has significant advantages in terms of shape and conductivity.

The present application relates to the technical field of soil remediation materials, and more specifically, to a method for preparing and applying a conductive polymer-cellulose composite material. The composite material uses activated carbon fiber as a raw material to prepare a modified cellulose material. A conductive polymer, namely phytic acid-doped polyaniline, is prepared by polymerization and composited with the modified cellulose material to prepare a conductive polymer-cellulose composite material. The conductive polymer-cellulose composite material is combined with electric remediation technology to remediate cadmium-contaminated soil. Applying the conductive polymer-cellulose composite material to electric remediation technology improves the remediation capacity of heavy metal-contaminated soil.

The invention relates to the technical field of ecological restoration equipment, in particular to an electrode-adjustable heavy metal contaminated soil leaching restoration device which comprises a leaching bin, a supporting pad is arranged at the bottom of the leaching bin, guide-in pipes are arranged on the two sides of the leaching bin, a partition plate is arranged in the leaching bin, and the electrode-adjustable heavy metal contaminated soil leaching restoration device is arranged in the leaching bin by rotating a rotating handle. A handle is rotated to drive an adjusting gear to rotate through an adjusting rod, the adjusting gear drives an adjusting rack to move relatively under the meshing acting force, the adjusting rack drives electrode columns to move relatively under the guiding acting force of a limiting plate, and therefore the distance between the two electrode columns is adjusted, and the problem that when low-permeability polluted soil is subjected to leaching remediation, the electrode columns are damaged is effectively solved. For heavy metal contaminated soil with different permeability, leacheate is difficult to fully permeate into the contaminated soil to influence the overall remediation efficiency, an electric enhanced leaching remediation technology is adopted, the distance between a cathode electrode and an anode electrode is designed to be adjustable, and the synergistic effect between electric remediation and leaching remediation can be effectively improved for heavy metal contaminated soil with different permeability.

The invention discloses a method for electrokinetic remediation of heavy metal Cd in soil through coupling of nitrified humic acid and hydrodynamic force, and belongs to the technical field of soil remediation. According to the method, nitration humic acid is prepared through nitric acid modified humic acid, and the effective state concentration of Cd in soil can be remarkably increased; the method comprises the following steps: injecting nitrified humic acid as an enhancer into polluted soil, activating stable-state Cd, and converting the stable-state Cd into a transferable state; constructing an electrokinetic remediation system comprising a specific electrode combination, and applying a direct-current electric field to drive the directional migration of Cd; the ion transmission environment is optimized by combining a water power circulating device, the pH polarization phenomenon is relieved, and the repairing efficiency is cooperatively improved. Experiments show that the method can enable the Cd removal rate of the anode and the middle area to reach up to 95%, has the advantages of high efficiency, environmental protection, simplicity and convenience in operation, high adaptability and the like, is suitable for remediation of soil in farmland, mining area and the like polluted by medium and high-concentration Cd, and provides a new technical path for heavy metal polluted soil remediation.

The application provides a sand layer heavy metal contaminated soil in-situ electric dynamic remediation device and a remediation method thereof, and relates to the technical field of environmental protection engineering construction. The sand layer heavy metal contaminated soil in-situ electric dynamic remediation device comprises two electrode chambers, at least two liquid control chambers are installed on each electrode chamber, at least two remediation pipes are fixedly installed on the bottom of the at least two liquid control chambers in correspondence, soft clay is filled into the at least two remediation pipes, and the at least two remediation pipes are communicated with the liquid control chambers and the electrode chambers through the soft clay. Based on the low permeability of the contaminated soft clay, the remediation pipe is used, the pipe opening avoids the sand layer, the electrolyte above the ground and the electrode are used, and the contaminated soil is remediated by applying a direct current electric field.

The invention discloses a method for intensifying dissolution of arsenic lead ore solid solution through an electric field and application. The method comprises the following steps: preparing a mixed solution from a sodium arsenate solution and a sodium chloride solution in proportion, and preparing an arsenite solid solution by taking a lead acetate solution as a basic solution; different electrolytes are selected at the temperature of 25 DEG C according to the dissolving-out speed and concentration requirements of arsenic ions and lead ions, an arsenite solid solution is subjected to electric field strengthening rapid dissolution, and the technology provides technical support for electrokinetic remediation of soil polluted by arsenic and lead and resource utilization of tailings containing arsenic and lead.

The application discloses a preparation method of an acetylene black combined polypyrrone loaded multi-walled carbon nanotube auxiliary electrode and application of the auxiliary electrode in soil electrokinetic remediation, and belongs to the technical field of electrokinetic remediation of organic matter contaminated soil. The auxiliary electrode is prepared by mixing acetylene black and multi-walled carbon nanotubes and then in-situ polymerizing polypyrrone and pressing into a sheet by a powder pressing method. The auxiliary electrode has a large specific surface area, excellent conductivity and rate performance, and can be used in electrokinetic remediation of contaminated soil, can effectively increase the current intensity, maximally reduce the interface side reaction with electrolyte, improve the current efficiency in the electrokinetic remediation process, reduce the energy consumption of electrokinetic remediation, and improve the organic matter treatment capacity of contaminated soil, so as to achieve the purposes of small environmental disturbance, green environmental protection, high economic benefits and the like.

The invention discloses a system and a method for remediation of heavy metal contaminated soil through combination of leaching and electric power. The system comprises a soil screening device, a leaching device, an electrokinetic remediation device and a solid-liquid separation and recovery device. The method comprises the following steps: carrying out screening treatment on the polluted soil, then leaching and activating, carrying out electrokinetic remediation to directionally migrate and enrich heavy metals, and finally carrying out solid-liquid separation and recycling leacheate. Through organic combination of screening, leaching, electrokinetic remediation and solid-liquid separation, the problems that the remediation effect of high-clay soil is poor and the remediation cost is high are effectively solved, and efficient and economical remediation of the heavy metal contaminated soil is achieved.

The invention relates to an electrokinetic remediation device for soil polluted by perfluorooctanoic acid. An electrode assembly comprises two graphite rods arranged in an anode chamber and a cathode chamber respectively, one end of each graphite rod extends into electrolyte of the anode chamber or the cathode chamber, and the other end of each graphite rod is connected with a power supply assembly through a wire; the isolation assemblies are arranged at the joint of the soil chamber and the anode chamber and the joint of the soil chamber and the cathode chamber; the power supply assembly is a direct-current stabilized power supply and is used for providing stable direct-current voltage for the electrode assembly so as to form an electric field with set intensity in the soil chamber. The invention further relates to a perfluorooctanoic acid contaminated soil electrokinetic remediation method. According to the device and the method, migration of PFOA is promoted through a stable electric field, an isolation assembly prevents soil particles from polluting an electrode and assists electrolyte permeation, and the desorption efficiency of the PFOA is improved in cooperation with sodium cholate; in-situ remediation does not need large-scale earth cutting, cost is reduced, the soil structure and microorganisms are protected, energy consumption is low, secondary pollution is avoided, remediation is efficiently achieved, and ecology and economy are both considered.

This invention belongs to the field of river and lake sediment remediation technology, and discloses an in-situ electric remediation system for river and lake sediments. The system includes an insulated remediation support frame with multiple openings on the walls of its upper and lower horizontal pipe groups; a pair of anode electrode rods inserted into a pair of opposite pipes in the lower horizontal pipe group; a pair of cathode electrode rods inserted into a pair of opposite pipes in the upper horizontal pipe group; the anode and cathode electrode rods are respectively connected to the positive and negative terminals of a power supply via wires; a remediation material package fixed to the upper horizontal pipe group of the insulated remediation support frame; an insulated positioning rod inserted into a vertical pipe for insertion into the remediated sediment; a rigid force transmission sleeve fitted onto the upper section of the insulated positioning rod; and a traction rope assembly, with one end of each traction rope fixed to the upper horizontal pipe group and the other end wound around a pulley and fixed to a rope shaft. The above system has a simple structure and can effectively remediate river and lake sediments contaminated with heavy metals.

The application discloses a kind of electric remediation device and continuous removal system for removing and recovering chromium-contaminated soil, and relates to the technical field of soil electrokinetic remediation, comprising: tank, tank is divided into soil chamber, permeable reaction wall, anode chamber and first cathode chamber by first hollow partition arranged inside tank;First electrode rod is inserted in anode chamber and first cathode chamber;First anion exchange membrane is clamped in the first hollow partition between soil chamber and permeable reaction wall, to prevent trivalent chromium ions from entering soil chamber in reverse;Cation exchange membrane is clamped in the first hollow partition between permeable reaction wall and anode chamber, to make trivalent chromium ions directional migration to first cathode chamber under electric field driving, first anion exchange membrane effectively prevents trivalent chromium ions generated in reduction process from migrating into soil due to electromigration, and further causing secondary pollution;Cation exchange membrane ensures that trivalent chromium ions directional migrate to first cathode chamber under the action of electric field.