268 results about "Electrokinetic remediation" patented technology

The invention provides an electric complex-strengthening repairing method and device of heavy metal-organic co-contaminated soil. The method provided by the invention comprises the following steps of: filling contaminated soil into an electric repairing device, and then adding an oxidant into a cathode electrolyte and an anode electrolyte or directly spraying the oxidant on the contaminated soil, wherein the oxidant comprises hydrogen peroxide, pypocholoride and persulfate; applying a direct-current electric field on a cathode and an anode, wherein the strength of the electric field is 0.5-2 V / cm; and controlling the pH values of the cathode electrolyte and the anode electrolyte to be 3-11. By selecting the suitable for oxidant and controlling the pH value of the electrolyte, the migration of the heavy metal can be effectively increased and the removing efficiency is improved; and meanwhile, the oxidant is used for effectively degrading organic pollutants when the pollutants are migrated, thereby relieving the post-treatment and simultaneously removing the heavy metal and the organic pollutants.

The invention relates to an in-situ remediation method of heavy metal-organic combined pollution soil. According to the method, a set of electrokinetic remediation device is added with a power switching system, an electrode heating technology is combined with the electrokinetic remediation and chemical oxidization technology, namely, the direct current power is utilized firstly, sodium persulfate used as the oxidizing agent is migrated to soil through electric process, meanwhile, migration and removal of heavy metal ion in the soil are realized. Then the alternating current power is switched, and soil is heated to a certain temperature through the electrode heating method so as to activate the sodium persulfate migrated to soil, and thereby realizing the in-situ degradation of organic pollutant in the soil. The method applies electrode to the electrode heating system and the electrokinetic remediation device at the same time, simplifies the remediation device and saves the system energy consumption while solves the difficulty that oxidant cannot migrate and activate in the soil and improves the remediation efficiency; the method is a combined soil remediation technology with prospect of application and promotion.

The invention relates to composite electrodes and an electrokinetic remediation method of heavy metal polluted soil by using the composite electrodes. According to the electrodes, an active material layer is adhered to the surface of graphite electrodes or metal electrodes of an anode and a cathode so as to form integrated composite electrodes with permeable reactive performance. By the permeablereactive layer, on one hand, H<+> and OH<-> generated from the electrode reaction can be neutralized and adsorbed, the pH value of the soil can be effectively controlled, and the heavy metal can be prevented from being prematurely deposited in the soil. On the other hand, migrated heavy metal pollutants can be captured, and in situ removal of the heavy metal pollutants in the soil can be realizedby removing the composite electrodes.

The invention discloses composite technology combining an electrodynamic method and a chemical leaching method, namely a process for performing high speed in situ restoration on heavy metal pollution soil without secondary pollution, wherein a natural organic complexing agent and an acidic anode working solution are used as a leaching agent; a leaching liquid containing heavy metals is migrated to a cathode processing area through electroosmotic flow; and combining the advantages that the electromigration can pass through low-permeability soil and a low pH anode working solution and can strengthen the desorption of solid heavy metals, the leaching agent can be selected as comparably mild natural organic acid so as to avoid the secondary pollution at source; simultaneously, with the repair process, pH jump points formed near a cathode are leached intermittently, an acid migration belt is controlled to advance continuously so that the pH jump points appear in the cathode processing area, and the problem of the reduction of the current efficiency with the time because of the decline of the local conductivity caused by the neutralization reaction between an acid surface and an alkali surface at a restoring part is avoided.

The invention discloses an electrodynamic and drop-irrigation combined heavy-metal-polluted soil remediation method. The method comprises the following steps of: mounting positive and negative electrodes at the two ends of heavy-metal-polluted soil, wherein the positive and negative electrodes are made from carbon fibers; respectively placing adsorbents between the positive electrode and the polluted soil and between the negative electrode and the polluted soil; placing a drop irrigation device above soil close to the absorbents; slowly dropwise adding electrolyte, buffer solution or a complexing agent and the like into the polluted soil at the two sides, and carrying out periodic polarity switching, wherein heavy metal moves under the action of electric migration and is adsorbed by the adsorbents, thus concentration of the heavy metal in the soil is reduced. According to the invention, drop irrigation technology is applied to polluted soil electric remediation, a complex anode chamber, a complex cathode chamber and an electrolyte circulating system in the traditional electrodynamic remediation are not used, a proper amount of drop irrigation liquid is reserved in the soil, electrolyte and secondary pollution are effectively avoided, and the method disclosed by the invention has the advantages of simple structure, operation convenience, practicability, effectiveness and the like.

The invention relates to a method for removing heavy metal in sludge from municipal sewage plant by using emerging electrokinetic remediation (ERT) green technology, belonging to the technology field of environmental protection. The method comprises the steps of: building an ERT device; and loading the pre-treated sludge from municipal sewage plant into a sludge bed, and performing electrokinetic treatment at a bed body voltage gradient of 1.2-1.3 V / cm while maintaining pH of electrolyte at 6-8 and employing poly epoxy succinic acid (PESA) as complexing agent for enhancing electromigration capability of heavy metal. The mean removal rate of the heavy metal is over 60% during the electrokinetic process. The Cu, Zn, Cr, Pb, Ni and Cd contents in the treated sludge completely satisfy the sludge agricultural application national standard (GB4284-84). The inventive method has the advantages of simple process, short treatment period, good treatment effect, and low treatment cost; and will take an important role in harmless and resource treatment of municipal sludge, especially industrial sludge in the future.

The invention discloses a remedying method for removing chrome in contaminated soil of a chromium slag site in situ. The method comprises the following steps of: (1) smashing the air-dried chromium-contaminated soil of the chromium slag site, and sieving the smashed soil; (2) mixing the soil sieved in the step (1) and a citric acid solution to ensure that the moisture content of the soil reaches a set value, carrying out uniform stirring and then carrying out balancing for one day; (3) putting the soil balanced in the step (2) in a soil sample chamber of an electrokinetic remediation device, wherein the two ends of the soil sample chamber of the electrokinetic remediation device are respectively a cathode chamber and an anode chamber; and (4) adding an electrolyte to the cathode chamber and the anode chamber, respectively inserting graphite electrodes in the cathode chamber and the anode chamber, and connecting a power source to ensure that electric currents pass through the soil chamber to carry out electrokinetic remediation, wherein the electrolyte is a KCI solution. For the high-chromium-content alkaline contaminated soil of the chromium slag site, the remedying method is simple in technology, higher in removal efficiency of chrome in comparison with a common electrokinetic remediation method, low in unit energy consumption and lowered in cost, and can effectively reduce the bioavailability of residual chromium in the soil.

The invention relates to an in-situ treatment method for electrically repairing heavy metal contaminated soil based on a plastic electrode. The in-situ treatment method is characterized by comprising the following steps: step I, determining the treatment depth of contaminated soil by performing soil experiment; step II, leveling ground; step III, performing water irrigation and pre-soaking on soil with the water content of less than 30%; step IV, distributing an anode plastic electrode (6) and a cathode plastic electrode (5); step V, distributing a water discharge pipe (3) and a water filling pipe (4); step VI, respectively connecting the cathode plastic electrode (5) and the anode plastic electrode (6) by using conducting wires (2), and gathering the cathode plastic electrode (5) and the anode plastic electrode (6) to be connected to positive and negative electrodes of a direct current power supply (1); and step VII, powering on the direct current power supply (1), and starting electro-osmosis treatment. The in-situ treatment method for electrically repairing the heavy metal contaminated soil based on the plastic electrode, disclosed by the invention, has the advantages that the in-situ treatment method can be used for rapidly reducing the heavy metal content of a soil body, and is relatively high in environmental protection performance.

The invention discloses a repairing system and method for heavy metal-organic combined polluted soil and underground water. The repairing system comprises an electric repairing system, a resistance heating system, a soil gas-phase extraction system, an extracted gas phase treatment system and a system switchover system. The electric repairing system comprises a positive electrode and a negative electrode connected with a direct current power source, and the positive electrode and the negative electrode are arranged in a positive electrode electrolytic cell and a negative electrode electrolytic cell respectively. The resistance heating system comprises a positive electrode and a negative electrode connected with an alternating current power source. The system switchover system comprises a control device which controls the switching-on and off of a first switch and a second switch through a temperature detector probe. According to the repairing system, the electrodes are applied to the resistance heating system and the electric repairing system, effective combination and unification of the electric repairing technology and the heat treatment technology are achieved, equipment of the system is simplified, the repairing effect is enhanced, and the removal efficiency is improved.

The invention belongs to the technical field of environmental treatment and in particular relates to a microorganism-electric power two-segment repairing method for petroleum contaminated soils. According to the microorganism-electric power two-segment repairing method disclosed by the invention, conversion between two segments including microorganism repairing and electrokinetic repairing is carried out with the ratio of the total petroleum hydrocarbon content and the total organic carbon content in contaminated soils, and the purpose of preparing the petroleum contaminated soils is achieved; microorganisms are capable of preferentially degrading light components which are easily degraded in petroleum hydrocarbon and then removing heavy components by virtue of the strengthening effect of an electric field, and staged degradation of pollutants is realized; the problem that the pollutants can not be completely degraded by virtue of single microorganisms is solved, and the energy consumption by virtue of single electrokinetic remediation is also lowered; the microorganism-electric power two-segment repairing method is rapid in speed for repairing the petroleum contaminated soils, high in efficiency and low in cost; and compared with single microorganism repairing and single electrokinetic repairing, the efficiency is improved by above 20-40 percent.

The invention discloses a method for repairing heavy metal polluted soil and special equipment thereof. The special equipment is a microorganism fuel battery; a positive electrode region consists of a positive electrode and microorganism culture liquid inoculated on the positive electrode; a negative electrode region consists of a catalyst-loaded carbon material and a buffering solution; a detoxification region is separated from the negative electrode region through a filtering membrane; the detoxification region is a sodium chloride aqueous solution. The repairing method comprises the steps of (1) air-drying the heavy metal polluted soil to be repaired, and performing screening and dilution to obtain heavy metal pollution sludge; (2) replacing the sodium chloride aqueous solution in the detoxification region with a heavy metal polluted soil solution, keeping for 3 days to 6 months, and thus finishing repairing. According to the method, the microorganism fuel battery converts organic matters into current, and the generated current is used for electrically repairing the heavy metal polluted soil, so that the repairing treatment speed is high, and the cost is low; the metal is particularly suitable for removing electric pollutants from low-permeation soil.

The invention discloses a method for restoring heavy metal contaminated soil by utilizing combination of microorganisms and EK-PRBs. According to the method, the heavy metal contaminated soil is repaired by using an electrokinetic (EK) repairing device, the electrokinetic repairing device is composed of a reactive tank, two electrodes, two permeable reactive barriers (PRB) and a direct-current power supply, the detachable permeable reactive barriers are arranged in front of the two electrodes respectively, the heavy metal composite contaminated soil, humus and a microbial reactive tank are arranged between the permeable reaction barriers, voltage is applied to the two electrodes, after electrification, cadmium in the soil is transferred to the cathode under the effect of the electric force and is adsorbed and fixed by the permeable reactive barrier before the cathode, chromium in the soil is transferred to the anode under the effect of the electric force and is adsorbed and fixed by the permeable reactive barrier before the anode, and the permeable reactive barriers for adsorbing and fixing heavy metal ions are removed so as to obtain the soil with pollution of the heavy metal ions removed. The method is simple to operate, low in cost and convenient to use, on-site repairing of the heavy metal contaminated soil can be realized, the repairing efficiency is high, and no new pollution is generated in the repairing process.

The invention belongs to the field of soil remediation and discloses an electrokinetic remediation method of heavy metal contaminated soil. The electrokinetic remediation method of heavy metal contaminated soil comprises the following steps of: preparing simulated heavy metal contaminated soil for later use; making an electrokinetic test device; and filling the simulated heavy metal contaminated soil into the electrokinetic test device; performing electrokinetic tests; and taking the simulated heavy metal contaminated soil one week later, and analyzing and testing heavy metals in the simulated heavy metal contaminated soil. The electrokinetic test device mainly comprises the following 5 reaction tanks in sequence: an anode chamber 1, a soil chamber 1, a cathode chamber, a soil chamber 2 and an anode chamber 2 in sequence, wherein a molecular sieve containing PRB (permeable reactive barrier) is arranged between two of the reaction tanks. The electrokinetic test device further comprises cathode and anode electrodes, cathode and anode working fluids and a direct-current stabilized-voltage power supply, wherein the cathode and anode electrodes and the cathode and anode working fluids are filled in the cathode and anode chambers.

The invention discloses a novel electrokinetic intensified technology and process for biologically remedying polycyclic aromatic hydrocarbon polluted soil, which successfully introduces nutrients and microorganisms into a reaction zone to degrade target pollutant, provides advantages for in situ bioremediation of the soil polluted by organic pollutant, and promotes research on electrokinetic remediation and in situ bioremediation. The process is the combined application of electrode switch and electrolyte mixture circulation of two electrodes in electrokinetic remediation; when the voltage gradient is 1 V / cm, the electrokinetic intensified remedying test is performed by adopting a motion manner of periodically changing electric field direction, when the electrode switch time is 12 h, the electrolyte is bacterium suspension (comprising nutrients), the pH value is 7.3, and the flow speed of the circular electrolyte is 800 ml / h. Test result indicates that the nutrients and the microorganisms can be introduced into the zone to be remedied by the novel electrokinetic intensified biologically remedying process, the target pollutant can be degraded, and the problems of easiness in change of soil pH value and nonuniform distribution of nutrients in conventional electrokinetic remediation are solved, and the bioremediation efficiency is increased by 55%, thus providing advantages to the in situ bioremediation of the soil polluted by organic pollutant, and effectively improving the bioremediation efficiency.

The invention relates to an electrokinetic remediation method and device of heavy metal contaminated soil. The device comprises a pre-treatment system, a direct current voltage-stabilizing power supply, an electrokinetic electrode, a main control system and an after-treatment system, wherein the main control system is connected with and controls the pre-treatment system, the direct current voltage-stabilizing power supply and the after-treatment system; the direct current voltage-stabilizing power supply supplies power to the electrokinetic electrode. According to an electrokinetic soil remediation technology, the heavy metal contaminated soil can be remediated in situ, secondary pollution is avoided, and the treatment cost is low. The problems of high equipment investment, high treatment cost, high probability of secondary pollution and the like of a conventional soil remediation technology are solved.

Belonging to the technical field of soil remediation, the invention in particular relates to an in-situ full-automatic contaminated soil remediation device. Disposed on a delivery vehicle, the device comprises a soil metal ion chelating agent and acid-base neutralizing agent injection instrument, a metal ion electrokinetic remediation instrument, a soil remediation microbial spray instrument, a rotary tillage and rotovation instrument, and a microcomputer control system. Specifically, the soil metal ion chelating agent and acid-base neutralizing agent injection instrument, the soil remediation microbial spray instrument, the metal ion electrokinetic remediation instrument and in electric connection with the microcomputer control system. The soil metal ion chelating agent and acid-base neutralizing agent injection instrument and the soil remediation microbial spray instrument respectively perform chemical chelation remediation and microbial in-situ remediation on the contaminated soil. The metal ion electrokinetic remediation instrument performs electrokinetic remediation on the contaminated soil. The rotary tillage and rotovation instrument is connected to a power unit of the delivery vehicle through a rotary tillage and rotovation transmission unit. And the rotary tillage and rotovation instrument performs aeration oxidation remediation on the contaminated soil. The in-situ full-automatic contaminated soil remediation device provided by the invention has the characteristics of high degree of automation, high efficiency, low energy consumption, and environmental protection, etc.

The invention discloses a novel process and technology for strengthening electric remediation and bioremediation of polycyclic aromatic hydrocarbon contaminated soil by using a surfactant, and provides the novel process for strengthening the electric remediation and the bioremediation of the polycyclic aromatic hydrocarbon contaminated soil by using the surfactant, and parameters of the process, which effectively improves the efficiency of the slightly soluble organic pollutant in the bioremediation, and propels the researches on the electric remediation and in-situ bioremediation. According to the process provided by the invention, electrolytes of two electrodes are mixed and circulated, and the surfactant and microorganisms are added in the electrolytes for electric injection. A test for strengthening the electric remediation and the bioremediation by using the surfactant is carried out in conditions as follows: a voltage gradient is 1 V / cm; the electrolytes are bacterium suspension (containing nutrients) and the surfactant; a pH value is 7.3; and the flow velocity of the circulating electrolytes is 800 ml / h. Shown by a test result, the novel process for strengthening the electric remediation and the bioremediation by using the surfactant can effectively improve a degradation speed of the contaminated soil in China and Philippines, improves a degradation speed of pyrene and benzopyrene, and solves the problem that the acid-base variation of a pH value of the soil is easy to occur in the traditional electric remediation and bioremediation.

The invention discloses a method for processing heavy metal Cd contaminated soil, which is characterized by comprising the steps of adding rhamnolipid aqueous solution with concentration of 0.5-2g / L into a negative electrolytic tank, adding deionized water into a positive electrolytic tank, installing a filter cloth between the Cd contaminated soil needed to process and the negative electrolytic tank as well as the positive electrolytic tank, installing a permeable reaction wall on an enrichment place of the heavy metal Cd far away from five eighth of an anode S3, and switching on to electronically repair the Cd contaminated soil. The Cd concentration rate is above 4 times higher than an initial value; and under the function, the concentration rate is reduced to about 3.63 times, the total removal ratio of the heavy value Cd of the whole soil is about 40%, and the contribution ratio of the permeable reaction wall on the removal ratio is about 90%, so that the alkaline rhamnolipid solution proves that the process of the heavy metal from enrichment to removal can be realized by the electrical repair and the permeable reaction wall. The method is simple in operation condition, wide in range of application, low in cost, high in efficiency, liable to realize, and has the better social benefit and biological benefit on the heavy metal Cd contaminated soil.

The invention relates to a preparation method of a biochar-like matter used for heavy metal contaminated soil repair, the method includes pretreatment of raw materials, mixed inoculation of raw material bacteria liquid, low temperature pyrolysis and charring, crushing, screening and other steps, the biochar-like matter is prepared from one or more of plant and animal residues, food market garbage or kitchen wet waste as the raw materials, and compared with the existing technology such as replacement, electrokinetic remediation, complexation leaching, steam extraction, oxidation reduction electric mechanical repair and the like, the biochar-like matter adopts in-situ remediation technology, and has the advantages of low manufacturing and implementation cost, stability and the like.

The invention relates to an apparatus and a method for repairing polluted soil and underwater by cooperation of in-situ electricity and electrochemistry. In the method, a mono-metal or double-metal electrode having a nano-scale surface or an air cathode having advanced pollutant oxidation function is formed for reducing and degrading organic pollutants, then the formed electrode is used as a cathode in the electric repairing apparatus; a direct-current electric field is applied to a medium to migrate the organic pollutants in the medium to the cathode, thus achieving cooperation of electric field driven pollutant migration and in-situ electrode electrochemical degradation. The method avoids complex engineering problems, such as secondary treatment after extraction of a cathode solution, extra addition of a redox agent, arrangement of PRB and the like, during a conventional electric repairing process, and can significantly reduce engineering work load and repairing cost in the electricrepairing. The invention provides the in-situ repairing method for the polluted soil and underwater, which is simple in preparation, is low in cost and has high-effective cooperation.

The invention discloses an electrokinetic remediation contaminated soil display system. The system comprises a detection subsystem, a real-time sampling subsystem, a transmission subsystem, a treatment subsystem, a display subsystem, a recording and storing subsystem and a feedback subsystem. By means of the electrokinetic remediation contaminated soil display system, multiple sensors are effectively integrated, detection, displaying and storing of electric field intensity, pH, Eh, moisture content, temperature and soil interstitial water heavy metal concentration at any position in an electrokinetic remediation treatment box can be achieved, and the later-period data processing is facilitated. The electrokinetic remediation contaminated soil display system is of great significance in knowing soil remediation conditions, improving electrokinetic remediation efficiency, reducing manual work amount for monitoring soil remediation and reducing maintaining cost.

The invention provides a two-dimensional inhomogeneous field experiment device for electrically repairing polluted soil. The two-dimensional inhomogeneous field experiment device comprises a soil sample trough, a gas measuring device, a liquid circulating and measuring device, an electrode control system and a data acquisition system, wherein the soil sample trough comprises a trough body, a top cover, a bottom cover and bolts; center nuts and a plurality of other nuts which are arranged around the center nuts and are in center symmetric and annular are arranged on the top cover and the bottom cover, electrodes are arranged between the upper nuts and the lower nuts, a plurality of probes are uniformly distributed on the top cover, a graded tube is used as the gas measuring device, the liquid circulating and measuring device comprises a connecting pipe, a total distributing pipe, a peristaltic pump and a liquid measuring device, the electrode control system is connected with the electrodes, and the data acquisition system is connected with the probes. The two-dimensional inhomogeneous field experiment device is capable of well simulating the repairing condition of the polluted soil, brings the convenience for monitoring various electric power parameters in real time in an experiment process, is beneficial to removal of pollutants and reduction of energy consumption, is high in system stability, and has an experiment value and an application prospect.

The invention discloses a device and a method for repairing caesium contaminated soil with a cathode approximation method, belonging to the field of caesium contaminated environment repairing technology. The device comprises a soil sample chamber, an electrode chamber, an electrode, a power supply and a pipeline, wherein the soil sample chamber comprises two hollow cylinders which are concentric, have different radiuses and have the same height, the hollow cylinders are arranged inside and outside to form an inner chamber and an outer chamber, a plurality of first-level anode chambers are uniformly arranged on the inner side of the outer cylinder and are close to the chamber wall, a plurality of second-level anode chambers are uniformly arranged at the inner side of the inner cylinder and are close to the chamber wall, and a cathode chamber is arranged at the center of the cylinder. The treatment method comprises the steps of fixing the cathode, changing the anode along with electrokinetic remediation, and enabling contaminants to be approximated to the cathode continuously, so as to enrich the contaminants-caesium in the soil in a specific cathode zone, effectively transfer the contaminants-caesium to be out of the contaminated soil, and reduce the volume of the contaminated soil; and finally adsorbing adopting an adsorbing material and recycling.

The invention discloses a magnetic-assistance electrokinetic remediation device for contaminated soil. According to the magnetic-assistance electrokinetic remediation device for the contaminated soil, contaminants in the contaminated soil can be enriched in a regulated area in an acceleration mode through the effect of an extra electric field and the effect of an extra magnetic field, so that the purpose of cleaning the contaminated soil is achieved. The magnetic-assistance electrokinetic remediation device for the contaminated soil comprises an electrode liquid addition tube, an anode plate, a processing area, a cathode column, an electrode chamber, a magnet, an outer shell and an electrode liquid discharging tube. The contaminated soil is placed into the processing area, electrode liquid enters the area of the electrode chamber through a pipeline, the contaminants in the contaminated soil can rapidly transfer through the extra electric field and the extra magnetic field, and the concentration of the partial contaminants is improved. The magnetic-assistance electrokinetic remediation device for the contaminated soil is simple in structure, low in construction cost and easy to operate, can achieve degradation and removal of various contaminants in the contaminated soil.

The invention discloses a method for electrically repairing heavy metal As (Arsenic) contaminated soil by using rhamnolipid, which comprises the steps of controlling the moisture content of the soil to 27% to 33%, adding a rhamnolipid solution with concentration of 0.5 to 4g / L into a negative electrolytic tank, adding deionized water into a positive electrolytic tank, installing a permeable reaction wall consisting of lytags and fine sand with the weight ratio of (3 to 5) to 10 in an enrichment place of a pollutant heavy metal As, and switching on to electronically repair the As contaminated soil. The alkaline rhamnolipid solution provided by the invention can advance the removal ratio of the heavy metal As to 28.53%, wherein the total removal ratio of the heavy metal As is further advanced to about 40% by the permeable reaction wall, and the contribution ratio of the permeable reaction wall on the removal ratio is close to 90%, so that the alkaline rhamnolipid solution proves that the removal ratio of the heavy metal is promoted by the electrical repair and the permeable reaction wall. The method is simple in operation condition, wide in range of application, low in cost, high in efficiency, and liable to realize, and has better social benefit and biological benefit on the heavy metal As contaminated soil.

A system for managing fluids used during electroremediation of contaminants in a porous medium, such as soil is disclosed. The system monitors the fluid gain and loss from the electrode wells and maintains optimal fluid levels in the wells on an individual basis. The system may use a sensor element for measuring the metal ion content of the electrode well fluid. A method for using the fluid management system is also disclosed.

The invention provides an electric promoting eluting and removing device and an electric promoting eluting and removing method for soil heavy metal based on an electric geotextile. An eluting agent is applied to heavy metal polluted soil and the eluting agent and soil are uniformly mixed through a plowing machine, so that the heavy metal in the soil is desorbed into a soil solution through eluting; EKG electrodes are buried into the soil at intervals in parallel and are used as anode and cathode materials of electrodynamics; an interval electrifying manner is adopted under the potential gradient of 0.2V / cm-4V / cm, so that the heavy metal with positive charges in the farmland soil is desorbed into the soil solution through eluting, and is enriched to a cathode under the action of an electric field; then the heavy metal is transferred out of the soil under the action of circulating washing of electrode liquid; and the washed electrode liquid is treated and then is circularly used for washing an electrode. By adopting the electric promoting eluting and removing device and method, the effect of chemical eluting can be improved and the discharging of an eluent is promoted; and meanwhile, the problem of soil acidification and alkalization in an electric remediation process is effectively avoided, and the electrode can be conveniently and rapidly mounted and used in field.

A method for removing the copper pollution in laterite includes such steps as arranging the electrolytic pools at both ends of the polluted laterite region, arranging a processing pool close to each electrolytic pool in order to exchange liquid, inserting electrodes in said electrolytic pools, applying a DC power supply across them, and using an automatic pH control system to control the pH value of cathode pool to be in a certain range.

The invention discloses a device for repairing polluted soil and underground water by adopting a composite electrode. The device comprises an electric repair device, a direct-current power supply, an ammeter, a slide rheostat, the composite electrode and a graphite electrode, wherein the electric repair device consists of a repair chamber, a cathode electrolytic cell, an anode electrolytic cell and electrolyte storage tanks; the repair chamber comprises composite polluted soil and the underground water; the cathode electrolytic cell and the anode electrolytic cell are arranged at the two ends of the repair chamber; the composite electrode is mounted in the cathode electrolytic cell; the surface of the composite electrode is coated with an active material; the graphite electrode is mounted in the anode electrolytic cell; the cathode electrolytic cell and the anode electrolytic cell are respectively connected with an electrolyte storage tank; a monitoring probe is mounted between the cathode electrolytic cell and the anode electrolytic cell; the direct-current power supply, the ammeter and the slide rheostat are connected in series between the composite electrode and the graphite electrode. The invention also discloses a method for repairing polluted soil and underground water by adopting the above device.

The invention relates to an electrokinetic remediation method of polluted soil and groundwater; according to the method, by using the trapping effect of ion-induced voltage well, artificial high-conductance soil is established between a cathode and an anode so as to prepare an artificial focusing zone; upriver pollutants are entrapped in the artificial focusing zone, and downriver pollutants still migrate into the electrode working fluid for removal. The artificial focusing zone rich in pollutants is excavated, and is treated and disposed by a transposition method. The advantages of the method are that: the migration distance and time of upriver pollutants of the artificial focusing zone are shortened, and thus the time, energy consumption and related cost of the electrokinetic remediation of the whole field are reduced.