CN105665437B - A kind of device using Electroremediation contaminated soil - Google Patents

Abstract

The invention discloses a device for repairing polluted soil by using electric power, and belongs to the technical field of waste treatment. The device of the invention adopts a hexagonal shell design, six anode devices form a regular hexagon, and the cathode device is in the center, which includes a DC power supply, an electrolyte raw material chamber, a soil remediation reactor, an ion exchange chamber, an electrolyte solution mixing chamber and a waste liquid. In the collection chamber, the soil remediation reactor in the device is inserted into the soil, and the cathode and anode are connected to the DC power supply to form a DC electric field, so that heavy metals and organic matter can be removed under the action of electromigration and electroosmotic flow. The device can adjust the processing area according to the size of the processing site, or process it in batches according to the size and shape of the site.

Description

A device for remediating polluted soil using electric power

technical field

The invention relates to a device for repairing polluted soil by using electric power, and belongs to the technical field of waste treatment.

Background technique

In recent years, due to the rapid growth of population and the rapid development of industry, a large amount of various types of pollutants have been produced. Solid wastes are continuously stacked and dumped on the soil surface, harmful waste water is continuously infiltrating into the soil, and harmful gases and floating dust in the atmosphere are also continuously falling into the soil along with the rain, resulting in soil pollution. These pollutants are continuously accumulated in organisms through the food chain, and have great potential harm to human health. Soil pollutants can be mainly divided into heavy metals and organic matter, which have the characteristics of concealment, long-term effect and refractory degradation, so it is difficult to deal with them by conventional methods.

The bioremediation process mainly uses plants with strong ability to absorb pollutants to absorb soil pollution, or use microorganisms to degrade and purify soil, but most of the heavy metal hyperaccumulator plants are short, low in biomass, and slow in growth, so the remediation efficiency is greatly affected. , and it is not easy to operate mechanized; at the same time, microorganisms have strict requirements on external environmental conditions, which seriously restricts successful introduction. Methods of chemical remediation of contaminated soils have also received attention. Mainly by adding chemical remediation substances and chemical reactions with soil pollutants, the pollutants are degraded or their toxicity is reduced, such as chemical leaching technology, solution leaching technology, chemical fixation technology, etc. However, the chemical remediation process often produces secondary pollution and is only suitable for soils with high permeability coefficients.

The use of DC electric field enrichment technology has many advantages compared with bioremediation processes and chemical remediation processes: it can be applied to a wide range of pollutants; It has high economic benefits; it can be used in combination with other technologies at the same time; it has little damage to the nature and structure of the soil, and is not easy to form secondary pollution; it is more suitable for comprehensive treatment of dense soil with low permeability coefficient.

Electric remediation can be divided into in-situ electric remediation method and ex-situ electric remediation method according to the different treatment sites of soil remediation. At present, the existing ex-situ electric remediation is to excavate the contaminated soil, transfer it to an electric remediation device for electric treatment and remediation, and then transport the treated soil back to the original place and refill it into the original land. The ex-situ restoration treatment method not only greatly damages the vegetation and ecological environment of the original site, but also excavates and transports the soil, which greatly increases the treatment cost. The in-situ electric repairing method adopted in the present invention utilizes electric repairing equipment, installs it at the original site of the site, and directly performs electric repairing treatment on the soil. In contrast, the in-situ restoration method is less destructive to the original ecological environment, and because there is no soil transportation and excavation, it saves costs to a large extent.

The existing electric repair electrodes are arranged in parallel, and the electric field and current between the cathode and anode electrodes are constant. As the repair progresses, due to the enrichment and removal of pollutants, the current density will gradually decrease, and the repair efficiency will gradually decrease.

SUMMARY OF THE INVENTION

In order to overcome the above-mentioned problems, the present invention provides a device for remediating polluted soil by using electric power. In the present invention, the main body of the device is designed as a regular polygon, because the electric field formed by the arrangement of the regular polygon is a non-uniform electric field, which can effectively enhance the migration of pollution in the soil, and is conducive to the removal of pollutants. Moreover, the arrangement of regular polygons can more effectively fill the treatment site in field applications, improve the coverage efficiency of the device, and achieve seamless coverage without missing any place.

The main part of the device is a soil remediation reactor designed with a regular polygonal shell; the soil remediation reactor is divided into an anode electrolysis chamber, a soil column chamber, and a cathode electrolysis chamber; a plurality of anode electrolysis chambers are located at the vertices of the polygon, and a single cathode The electrolysis chamber is located in the center.

In an embodiment of the present invention, the polygon is a regular hexagon.

In an embodiment of the present invention, electrodes are provided in the anode electrolysis chamber and the cathode electrolysis chamber, which are respectively connected to the positive and negative electrodes of the DC power supply.

In an embodiment of the present invention, the anode electrolysis chamber and the cathode electrolysis chamber contain cones at the bottoms, so that the electrode chambers of the device can be safely put into the soil.

In an embodiment of the present invention, the electrode is a composite electrode composed of a mixture of graphite and acid-base zeolite.

In an embodiment of the present invention, the electrodes are in the form of non-uniform electrodes, arranged in a regular hexagonal arrangement, and can be disassembled for easy replacement.

In an embodiment of the present invention, the device further includes a DC power supply, a peristaltic pump, an electrolyte raw material chamber, an ion exchange chamber, an electrolyte mixing chamber, and a waste liquid collection chamber.

In an embodiment of the present invention, the electrolyte raw material chamber is connected with the electrolyte mixing chamber through a peristaltic pump; the electrolyte mixing chamber is respectively connected with the catholyte chamber, the anolyte chamber, and the ion exchange chamber through a peristaltic pump; The cathode electrolysis chamber is connected with the ion exchange chamber through a peristaltic pump.

In an embodiment of the present invention, the anode electrolysis chamber is connected to the waste liquid collection chamber.

In an embodiment of the present invention, the peristaltic pump is a mechanical diaphragm metering pump.

In one embodiment of the present invention, the ion exchange chamber contains an ion exchange material for filtering ions in the electrolyte drawn from the catholyte chamber.

In an embodiment of the present invention, the ion exchange chamber is provided with four layers of membranes, and the inner layer is filled with ion exchange resin.

In an embodiment of the present invention, the device further includes a liquid collection chamber; a semipermeable membrane is attached between the catholyte chamber and the liquid collection chamber, so that metal ions can enter the liquid collection chamber from the catholyte chamber and cannot Re-enter the cathode electrode chamber from the liquid collection chamber.

In one embodiment of the present invention, the electrolyte mixing chamber mixes the electrolyte that has been processed by the ion exchange chamber with the electrolyte in the electrolyte raw material chamber, and then enters the cathodic electrolysis chamber or the anodic electrolysis chamber again for recycling. .

The second object of the present invention is to provide a method for enriching heavy metals and/or organic matter in polluted soil, using the device.

The device comprises a DC power supply (1), a soil remediation reactor (11), an ion exchange chamber (7), an electrolyte mixing chamber (8) and a waste liquid collection chamber (9); the soil remediation reactor (11) Separated into an anode electrolysis chamber (4), a soil column chamber (10), and a cathode electrolysis chamber (5), the soil to be treated is placed in the soil column chamber (10), and the anode electrolysis chamber (4) and the cathode electrolysis chamber (5) are installed There is an electrolyte, and electrodes (6) are provided, which are respectively connected with the positive and negative electrodes of the DC power supply (1), and the electrolyte infiltrates the soil in the soil column chamber (10); the electrolyte enters the anode electrolysis from the electrolyte mixing chamber (8). In the chamber (4), the electrolyte entering the cathodic electrolysis chamber (5) by the electrokinetic effect is removed by the ion exchange chamber (7), and then enters the electrolyte mixing chamber (8) and the raw electrolyte from the electrolyte raw material chamber (3). Mixing, the electrolyte in the electrolyte mixing chamber (8) enters the anolyte chamber (4) or the catholyte chamber (5).

In one embodiment of the present invention, in the method, the electrolyte solution filled with pollutants in the anode electrolysis chamber (4) enters the waste collection place (9) for further processing.

In an embodiment of the present invention, the device further comprises a mechanical diaphragm metering pump (2), responsible for adding or reducing electrolyte in the anolyte chamber (4) and the catholyte chamber (5) to realize automatic operation.

In an embodiment of the present invention, the mechanical diaphragm metering pump is MGM0002 mechanical diaphragm metering pump, and the flow rate is 50 mL/min.

In an embodiment of the present invention, in the method, the distance between electrodes is 57 cm, and the voltage gradient is 2 V/cm.

In an embodiment of the present invention, the electrolyte is 0.01M NaCl solution or water or a mixture thereof.

In an embodiment of the present invention, Dowfax 8390 anionic surfactant is also added in the electrolysis chamber as an electrolysis control solution.

In one embodiment of the present invention, the method is to place the soil to be tested between the anode and cathode electrodes, and pump the electrolyte into the anode and cathode electrolysis chambers, so that the liquid level of the anode and cathode electrolytes is at the height of the soil sample. be consistent. Continue to pour the electrolyte into the cathode and anode chambers for 24 hours to make the soil solution reach a saturated state, then turn on the adjustable DC power supply and start energizing, the voltage gradient is between 0.5-6.0V/cm, run for 7-21 days, and turn off the power supply. It can also be energized intermittently to reduce energy consumption.

Beneficial effects of the present invention:

(1) The device is designed as a regular hexagon, because the electric field formed by the regular hexagon arrangement is a non-uniform electric field, which can effectively enhance the migration of inorganic ions in the soil and is conducive to the removal of pollutants. Moreover, the arrangement of regular hexagons can more effectively fill the treatment site in field applications, improve the coverage efficiency of the device, and achieve seamless coverage without missing any place.

(2) When the electrodynamic repairing contaminated soil device provided by the present invention has a heavy metal concentration of 500 mg/kg and a voltage gradient of 1.0-2.0 V/cm, after running for 360 hours, the heavy metals in the soil can be enriched to the cathode area, The mobility is over 85%. Therefore, the device can significantly improve the mobility of heavy metals, is an effective test device, and has great practical engineering application value.

(3) The device for remediating polluted soil by electrodynamics provided by the present invention can deal with any heavy metal/organic matter that damages the soil, reduces its quality and use value, and can pollute surface water and groundwater, causing harm to human health and agricultural production. More specifically, it refers to metal elements and metalloid elements with a density greater than 4.0g/cm ³ that can be toxic to living organisms or produce toxicity in excess, such as mercury, fluorine, lead, chromium, arsenic, copper, zinc, nickel, manganese etc., as well as POPs, organic poisons.

Description of drawings

Fig. 1 is the top view of soil remediation reactor; Wherein, 4 anode electrolysis chambers, 5 cathode electrolysis chambers;

2 is a schematic diagram of an embodiment of a device for remediating polluted soil by utilizing electrodynamic force; 1 DC power supply; 2 mechanical diaphragm metering pump; 3 electrolyte raw material chamber; 4 anode electrolysis chamber; 5 cathode electrolysis chamber; 6 electrodes; 7 ion exchange chamber; 8 electrolyte mixing chamber; 9 waste liquid collection chamber; 10 soil column chamber; 11 soil remediation reactor; 12 liquid collection chamber;

Figure 3: Schematic diagram of the three-dimensional structure of the soil remediation reactor; among them, 4 anode electrolysis chambers; 5 cathode electrolysis chambers, 12 liquid collection chambers, and 13 semipermeable membranes.

Detailed ways

The present invention will be further described in detail below through examples.

From the anode area to the cathode area, five equal sampling areas were set up, namely 1 ^# , 2 ^# , 3 ^# , 4 ^# , and 5 ^# , to sample and measure the pollutant concentration in each area of the soil after restoration.

Example 1: Device for remediating polluted soil using electrodynamics

The main part of the device for remediating polluted soil using electrodynamics of the present invention is a soil remediation reactor designed with a regular polygonal shell; the soil remediation reactor is divided into an anode electrolysis chamber, a soil column chamber, and a cathode electrolysis chamber; a plurality of anodes The electrolysis chambers are located at the vertices of the polygon, with the single cathodic electrolysis chamber at the center. The anode electrolysis chamber and the cathode electrolysis chamber are provided with electrodes, which are respectively connected with the positive and negative electrodes of the DC power supply. The anode electrolysis chamber and the cathode electrolysis chamber contain cones at the bottom, which is convenient for the electrode chamber of the device to be safely put into the soil.

Preferably, the polygon is a regular hexagon.

The device of the present invention can adjust the processing area according to the size of the processing site, or perform treatment in batches according to the size and shape of the site.

Example 2: Device for Remediation of Contaminated Soil Using Electrodynamics

As shown in Figure 1, it is a kind of composition mode of the device of the present invention, adopts the shell design of hexagon, and six anode devices form a regular hexagon, and the cathode device is in the middle. It includes a DC power supply 1, a soil remediation reactor 11, an ion exchange chamber 7, an electrolyte mixing chamber 8 and a waste liquid collection chamber 9; the soil remediation reactor 11 is divided into an anode electrolysis chamber 4, a soil column chamber 10, and a cathode electrolysis chamber. 5, the soil to be treated is in the soil column chamber 10, the anode chamber 4 and the cathode chamber 5 are equipped with electrolyte, and electrodes 6 are provided, which are respectively connected with the positive and negative electrodes of the DC power supply 1, and the electrolyte infiltrates the soil column chamber 10. soil.

The ion-exchange chamber 7 contains ion-exchange material for filtering ions in the electrolyte drawn from the catholyte chamber 5 . The electrolyte mixing chamber 8 mixes the electrolyte processed by the ion exchange chamber 7 and the electrolyte in the electrolyte raw material chamber 3, and then enters the catholyte chamber 5 or the anolyte chamber 4 again for recycling.

The electrolyte raw material chamber 3 is connected with the electrolyte mixing chamber 8 through the mechanical diaphragm metering pump 2; The pump is connected; the cathode electrolysis chamber 5 is connected with the ion exchange chamber 7 through a peristaltic pump.

The device also includes a liquid collection chamber 12; a layer of semi-permeable membrane 13 is attached between the cathode electrolysis chamber 5 and the liquid collection chamber 12, so that metal ions can enter the liquid collection chamber from the cathode electrolysis chamber and cannot enter again from the liquid collection chamber. to the cathode electrode compartment.

Example 3: Remediation of Chromium Contaminated Soil

Using the device shown in Figure 2, the main body of the electrodynamic heavy metal enrichment device is a regular hexagonal plexiglass device, which consists of a soil column chamber (L×H=50cm×65cm), an electrode chamber (16cm ² × 65cm) , stabilized DC power supply, composite graphite electrode (12cm ² × 50cm), mechanical diaphragm vacuum pump, etc. During the experiment, the electrolyte enters the anode electrode chamber from the electrolyte mixing chamber, and the electrolyte entering the cathode electrode chamber by the electrokinetic effect removes cations through the ion exchange chamber, and then enters the electrolyte mixing chamber and is mixed with the raw electrolyte before entering the anode electrode chamber. Finally, the electrolyte filled with contaminants in the anolyte chamber enters the waste collection for further processing. The inter-electrode distance was 57 cm, and the voltage gradient was 2 V/cm. The electrolyte is 0.01M NaCl solution. MGM0002 mechanical diaphragm metering pump was selected, and the flow rate was 50mL/min.

The experimental soil is cohesive soil. Soil samples were taken, air-dried, ground, and stored for later use after passing through a 2mm sieve. A certain amount of potassium dichromate was weighed, dissolved in deionized water, added to the soil sample, fully stirred and mixed, and then placed in a glass container for 15 d at room temperature. After measurement, the concentration of Cr in the tested soil sample was about 500 mg/kg, and the moisture content was 16.2%.

Operation steps of electrodynamic enrichment experiment: before the experiment starts, add NaCl solution into the soil column chamber, then slowly inject the test soil sample into the soil column chamber, and mix it with the NaCl solution (water-soil ratio is 1:2) to remove Air bubbles in the soil to avoid increasing electrical resistance. The anode and cathode liquids are distilled water, so that the anode liquid level, the test soil and the cathode liquid level are at the same height, turn on the peristaltic pump, pour distilled water into the cathode and anode chambers, and run for 24 hours to make the soil solution in the soil column chamber reach a saturated state. Then start to energize, and the voltage between the two poles is always 114V (ie, the potential gradient is 2V/cm). After the test soil was treated for 360 hours, the power was turned off, the soil samples in each area were taken out from the reaction device and air-dried to constant weight in the greenhouse, then ground into fine particles, passed through a 2mm sieve and stored for use, and then subjected to microwave digestion, and finally determined. The concentration of Cr in soil was determined by flame atomic absorption spectrophotometry.

The results showed that after the experiment, the pH of the soil was between 3.6 and 9.7 (from the anode area to the cathode area), and the electroosmotic flow rate was up to 650 mL. The heavy metal Cr migrated from the cathode area to the anode area in the form of oxoacid ions. The mobility of Cr(VI) in 4 ^# and 5 ^# sampling areas reached 63.7% and 54.2%, respectively, the Cr(VI) mobility in soils 2 ^# and 3 ^# decreased gradually ^, while the The content is as high as 877mg/kg. This shows that the heavy metals in the soil will be rapidly enriched in a certain area under the action of electrodynamic force.

Example 4: Remediation of Philippine Contaminated Soil

The phenanthrene enrichment experiment was carried out on the same phenanthrene-contaminated soil using the same experimental device as in Example 3 above.

The experimental soil is cohesive soil. Soil samples were taken, air-dried, ground, and stored for later use after passing through a 2mm sieve. A certain amount of phenanthrene was weighed, dissolved in acetone, added to the soil sample, fully stirred and mixed, and then placed in a glass container for incubation at room temperature for 15 days. After measurement, the concentration of phenanthrene in the tested soil sample was about 500 mg/kg, and the moisture content was 16.8%.

Operation steps of electrodynamic enrichment experiment: Before the experiment starts, add NaCl solution into the soil column chamber, and then put the test

The soil sample was slowly injected into the soil column chamber and fully mixed with NaCl solution (water-soil ratio was 1:2) to remove air bubbles in the soil and avoid increasing the resistance. The anode and cathode liquids are distilled water, so that the anode liquid level, the test soil and the cathode liquid level are at the same height, turn on the peristaltic pump, pass distilled water into the cathode and anode chambers, and run for 24 hours to make the soil solution in the soil column chamber reach a saturated state. Then start to energize, and the voltage between the two poles is always 114V (ie, the potential gradient is 2V/cm). After the test soil was treated for 360 hours, the power was turned off, the soil samples in each area were taken out from the reaction device and air-dried to constant weight in the greenhouse, then ground into fine particles, sieved through a 2mm sieve and stored for later use, and then ultrasonic extraction-high performance liquid chromatography was used. Finally, the concentration of phenanthrene in the soil was determined.

The results showed that after the experiment, the pH of the soil was between 3.8 and 9.1 (from the anode area to the cathode area), and the maximum electroosmotic flow rate could reach 610 mL; the phenanthrene was gradually enriched from the anode area to the cathode area, of which 1 ^# and 2 ^# were sampled The mobility of phenanthrene reached 52.4% and 41.5%, respectively. The mobility of phenanthrene in soils of 3 ^# and 4 ^# gradually decreased, while the content of phenanthrene in the 5 ^# sample was as high as 937 mg/kg. This shows that the organic matter in the soil will be rapidly enriched in a certain area under the action of electrodynamic force.

Example 5: Restoration of Cr-phenanthrene composite polluted soil

Cr and phenanthrene enrichment experiments were carried out on the same Cr-phenanthrene composite polluted soil with the same experimental apparatus as in the above-mentioned Example 2.

The experimental soil is cohesive soil. Soil samples were taken, air-dried, ground, and stored for later use after passing through a 2mm sieve. A certain amount of potassium dichromate and phenanthrene were weighed, dissolved in deionized water and acetone, respectively, added to the soil sample, fully stirred and mixed, and then placed in a glass container for incubation at room temperature for 15 d. After measurement, the concentration of Cr and phenanthrene in the tested soil sample was about 500 mg/kg, and the moisture content was 16.5%.

Operation steps of electrodynamic enrichment experiment: Before the experiment starts, add NaCl solution into the soil column chamber, then slowly inject the test soil sample into the soil column chamber, and mix it with the NaCl solution (water-soil ratio is 1:2) to remove Air bubbles in the soil to avoid increasing electrical resistance. The anode and cathode liquids are distilled water, so that the anode liquid level, the test soil and the cathode liquid level are at the same height, turn on the peristaltic pump, pass distilled water into the cathode and anode chambers, and run for 24 hours to make the soil solution in the soil column chamber reach a saturated state. Then start to energize, and the voltage between the two poles is always 114V (ie, the potential gradient is 2V/cm). After the test soil was treated for 360 hours, the power was turned off, and the soil samples in each area were taken out from the reaction device and air-dried to constant weight in the greenhouse, then ground into fine particles, passed through a 2mm sieve and stored for later use, and then digested by microwave-flame atomic absorption spectrometry. The concentration of Cr in soil was determined by photometric method, and the concentration of phenanthrene in soil was determined by ultrasonic extraction-high performance liquid chromatography.

The results showed that the pH of the soil was between 3.0 and 9.8 after the experiment (from the anode area to the cathode area), and the maximum electroosmotic flow rate could reach 590 mL; the phenanthrene was gradually enriched from the anode area to the cathode area, of which 1 ^# and 2 ^# were sampled The mobility of phenanthrene in the soils reached 49.4% and 38.5%, respectively. The mobility of phenanthrene in soils of 3 ^# and 4 ^# gradually decreased, and the content of phenanthrene in the 5 ^# sample was as high as 985 mg/kg. On the contrary, the heavy metal Cr migrates from the cathode area to the anode area in the form of oxo-acid ions, and the mobility of Cr(VI) at the 4 ^# and 5 ^# sampling points reaches 65.7% and 58.2%, respectively. Cr in the soils of 2 ^# and 3 ^# The mobility of (Ⅵ) gradually decreased, while the content of Cr(Ⅵ) in the 1 ^# sample was as high as 847 mg/kg. This shows that the soil remediation device can be used to remediate the soil contaminated by heavy metals and organic matter, and enrich the pollutants in a certain area of the soil.

Example 6: Remediation of Cr-phenanthrene composite polluted soil

The enrichment experiment was carried out on the same compound polluted soil with the same experimental device as in the above Example 2, the difference is that 10 times cmc (critical micelle concentration) Dowfax8390 anionic surfactant was added to the bipolar electrolysis chamber as the electrolysis control liquid.

The operation steps of electrodynamic enrichment experiment are slightly different from those in Example 1. Before starting the experiment, first add NaCl solution into the soil column chamber, then slowly inject the test soil sample into the soil column chamber, mix thoroughly with the NaCl solution (water-soil ratio is 1:2) to remove air bubbles in the soil and avoid increasing resistance. The anode and cathode liquids are distilled water, so that the anode liquid level, the test soil and the cathode liquid level are at the same height, turn on the metering pump, and pour distilled water into the cathode and anode chambers. After running for 24 hours, the soil solution in the soil column chamber reaches a saturated state. Then start to energize, and the voltage between the two poles is always 114V (ie, the potential gradient is 2V/cm). At the beginning of the experiment, the electrolytes passed into the cathode and anode chambers were all distilled water. When the reaction device was running for 12 hours, 10 times of cmcDowfax8390 solution was introduced into the cathode chamber. The total treatment of the tested soil was 360 hours. The soil samples in each area were taken out from each sampling port and air-dried to constant weight in a greenhouse, then ground into fine particles, passed through a 200mm sieve and stored for later use, and then microwave digestion-flame atomic absorption spectrophotometry was used to determine the concentration of Cr in the soil, using Determination of phenanthrene concentration in soil by ultrasonic extraction-high performance liquid chromatography.

The results showed that after the experiment, the pH of the soil was between 2.7 and 8.9 (from the anode area to the cathode area), and the maximum electroosmotic flow rate could reach 640 mL; phenanthrene was gradually enriched from the anode area to the cathode area, and 1 ^# and 2 ^# were sampled. The mobility of point phenanthrene reached 60.4% and 57.5%, respectively. The mobility of phenanthrene in soils of 3 ^# and 4 ^# decreased gradually, while the content of phenanthrene in 5 ^# sampled was as high as 805 mg/kg. On the contrary, the heavy metal Cr migrates from the cathode area to the anode area in the form of oxo-acid ions, and the mobility of Cr(VI) at the 4 ^# and 5 ^# sampling points reaches 85.7% and 81.2%, respectively, and the Cr in the 2 ^# and 3 ^# soils The mobility of (Ⅵ) decreased gradually, while the Cr(Ⅵ) content at the 1 ^# sample was as high as 702 mg/kg. This shows that adding the surfactant Dowfax8390 to the electrolyte can promote the migration of pollutants in the soil and improve the remediation efficiency of pollutants.

Although the present invention has been disclosed above with preferred embodiments, it is not intended to limit the present invention. Anyone who is familiar with this technology can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, The protection scope of the present invention should be defined by the claims.

Claims (5)

1. a device utilizing electrodynamics to repair polluted soil, is characterized in that, the main part of described device is the soil remediation reactor that adopts the shell design of regular polygon; Described soil remediation reactor is separated into anode electrolysis chamber, soil column chamber, cathodic electrolysis chamber; multiple anodic electrolysis chambers are located at the vertices of the polygon, and a single cathodic electrolysis chamber is located in the center; The device further comprises a DC power supply, a peristaltic pump, an electrolyte raw material chamber, an ion exchange chamber, an electrolyte mixing chamber, and a waste liquid collection chamber; The anode electrolysis chamber and the cathode electrolysis chamber contain cones at the bottom, which is convenient for the electrolysis chamber of the device to be safely put into the soil; The electrolyte raw material chamber is connected with the electrolyte mixing chamber through a peristaltic pump; the electrolyte mixing chamber is respectively connected with the catholyte chamber, the anolyte chamber and the ion exchange chamber through a peristaltic pump; the catholyte chamber and the ion exchange chamber are connected by a peristaltic pump; connected to the peristaltic pump; The device also includes a liquid collection chamber; a layer of semipermeable membrane is attached between the cathode electrolysis chamber and the liquid collection chamber; The polygon is a regular hexagon. 2. A method for enriching heavy metals and/or organic matter in polluted soil, using the device of claim 1. 3. The method according to claim 2, wherein the device comprises a DC power supply (1), a soil remediation reactor (11), an ion exchange chamber (7), an electrolyte mixing chamber (8) and a waste liquid A collection chamber (9); the soil remediation reactor (11) is divided into an anode electrolysis chamber (4), a soil column chamber (10), and a cathode electrolysis chamber (5), and the soil to be treated is placed in the soil column chamber (10) , the anodic electrolysis chamber (4) and the cathodic electrolysis chamber (5) are equipped with electrolyte, and electrodes (6) are arranged, which are respectively connected with the positive and negative electrodes of the DC power supply (1), and the electrolyte infiltrates the soil column chamber (10) The electrolyte enters the anode electrolysis chamber (4) from the electrolyte mixing chamber (8), and the electrolyte entering the cathodic electrolysis chamber (5) by the electrokinetic effect is removed by the ion exchange chamber (7), and then enters the electrolyte mixing chamber. (8) Mixing with the raw electrolyte from the electrolyte raw material chamber (3), the electrolyte in the electrolyte mixing chamber (8) enters the anolyte chamber (4) or the catholyte chamber (5). 4. The method according to claim 2, characterized in that, Dowfax8390 anionic surfactant is also added in the anode electrolysis chamber (4) and the cathode electrolysis chamber (5) as an electrolysis control solution. 5. method according to claim 2, is characterized in that, described method is that test soil is placed between yin and yang electrodes, passes electrolyte solution into yin and yang electrolysis chamber with pump, makes cation and anolyte electrolyte liquid level and The height of the soil samples remains the same, and the electrolyte solution is continuously fed into the cathode and anode chambers for 24 hours to make the soil solution reach a saturated state. Then, the adjustable DC power supply is turned on to start energization or intermittent energization, and the voltage gradient is between 0.5-6.0V/cm. 7-21 days.