CN106881339A - Pin-connected panel original position drip washing is electronic with EKG to cooperate with the device and method for removing heavy metal-polluted soil - Google Patents

Abstract

The invention discloses an assembled in-situ leaching and EKG electric cooperative removal device for soil heavy metals, comprising a leaching-electric cooperative operation platform, and an EKG electric removal device installed on the leaching-electric cooperative operation platform for inserting into the soil Module, and power supply, eluent penetration device, peristaltic pump, soil heavy metal solution storage tank. The EKG electric removal module includes an EKG electrode fixing plate, an EKG electrode fixed on the EKG electrode fixing plate, and a soil heavy metal solution collection tank. The EKG electrode and peristaltic pump are connected to the power supply, the heavy metal solution extraction hose is fixed on the EKG electrode fixing plate, the lower end extends into the soil heavy metal solution collection tank, and the upper end passes through the peristaltic pump and communicates with the soil heavy metal solution storage tank. The invention is an assembleable device, without excavating the soil, without using desorption electrodes, directly infiltrates the eluent into the soil pollution layer in situ, uses the electric field to elute and migrate heavy metals in situ, and removes the heavy metals after leaching The solution is separated and stored from the soil layer to realize the separation of heavy metals from water and soil.

Description

A device for removing heavy metals from soil in combination with in-situ leaching and EKG electric synergy method

technical field

The invention relates to the field of soil environmental protection and soil heavy metal pollution restoration, in particular to an assembled in-situ leaching and EKG electric synergistic device and method for removing soil heavy metals.

Background technique

With the development of industry and agriculture, the problem of soil heavy metal pollution has become increasingly prominent, posing a serious threat to the lives and health of the people. Therefore, there is an urgent need for remediation and treatment of heavy metal-contaminated soils. Chemical leaching is an efficient method for the remediation of heavy metal-contaminated soils, but it is not effective in removing heavy metals in low-permeability soils, and in-situ chemical leaching also has the problem of difficult drainage of eluent. Electric remediation refers to the introduction of low-voltage direct current into polluted soil, and the use of electric field to gradually migrate and separate soil pollutants through electromigration and electrodialysis. It is a green, efficient and new in-situ remediation technology. has unique advantages. Therefore, if the advantages of leaching and electric remediation can be complemented, the remediation efficiency of soil heavy metal pollution can be greatly improved. At present, there have been many theoretical studies and discussions on some process parameters and methods on the leaching and electric restoration of heavy metal contaminated soil at home and abroad, but there are few electric restoration devices, especially the coordinated removal of heavy metals in soil by in-situ leaching + electric restoration. There are fewer devices.

The invention patent "A combined leaching electric repair device and method for heavy metal-contaminated soil" (application number: 201510298674.9) discloses an ex-situ repair method for heavy metal-contaminated soil. After leaving, adjust the pH, then put the soil into the leaching tank for leaching, stirring and solid-liquid separation, and then transfer the leached soil to the electric restoration room for electric treatment.

The utility model patent "An Electric Restoration Type Soil Pollution Treatment Vehicle" (Patent No.: 201520782269.X) has the advantage of mobility by loading the polluted soil into the engineering vehicle and then performing electric restoration and electrothermal restoration. bit fixes.

The utility model patent "Leaching device for enhanced treatment of heavy metal-contaminated soil by electric method" (Patent No.: 201320357655.5) provides an ex-situ repair (ex-situ) device combining electric repair and leaching. The repair is placed in the same circular structure device. The outer ring of the device is the anode, and the center of the circle is the cathode. Heavy metals migrate from the anode to the cathode, and the eluent is injected from the top of the device through the pipeline.

Utility model patent "In-situ Electric Remediation Engineering Device for Mobile Site Contaminated Soil" (Patent No.: 201520899695.1), the electrode of the device is a hollow circular electrode group, and the electrode material is iron, titanium, stainless steel or graphite electrodes. The heavy metal solution in the electrode hollow cavity is extracted and enters the filter column, oxidation column and adsorption column, etc. The device is a detachable assembly design with good mobility.

The inventor found in the process of realizing the present invention that there are not many existing rinsing+electric restoration devices, and there are mainly the following deficiencies: (1) The existing electric restoration devices seldom consider the field conditions of polluted soil, and lack the ability to assemble (2) In-situ treatment devices, most electric repair devices are ex-situ treatment devices, and the cost of soil excavation is high; (3) Rare in-situ soil electric repair (in-situ) devices Most of the electrodes used are circular hollow electrodes, and the electrode materials are mainly iron, titanium, stainless steel or graphite electrodes. The site coverage is small, the repair efficiency is low, the electrodes have poor acid and alkali corrosion resistance, and are not easy to install; (4) In-situ soil electric repair process In this method, the heavy metal ions in the soil are adsorbed and enriched on the electrode, and then the electrode is eluted and separated. There are many operating steps and the separation efficiency is low.

Contents of the invention

In view of the above problems, the present invention uses electrokinetic geosynthetics (EKG) with both water-conducting and conductive properties as electrodes, and utilizes the electroosmotic dehydration and electromigration of EKG electrodes to propose an assembled in-situ leaching and EKG electrokinetic A device and method for synergistically removing heavy metals from soil. The device is a modular and assembleable device. It does not need to excavate the soil, and does not need a desorption electrode. It directly infiltrates the eluent into the soil pollution layer in situ, and uses the electric field to elute in situ and transfer heavy metals, and separate and store the heavy metal solution after leaching from the soil layer to realize the separation of heavy metals from water and soil. The device is easy to install, has high removal efficiency of heavy metals, and can be applied in batches and large scale, especially suitable for heavy metal contaminated sediment or farmland soil remediation.

An assembled in-situ leaching and EKG electric cooperative removal device for soil heavy metals, including a leaching-electric cooperative operation platform, an EKG electric removal module installed on the leaching-electric cooperative operation platform for inserting into the soil, and a power supply , eluent penetration device, peristaltic pump, soil heavy metal solution storage tank, the EKG electric removal module includes EKG electrode fixed plate and EKG electrode fixed on the EKG electrode fixed plate, soil heavy metal solution collection tank, EKG electrode and peristaltic pump and Power connection, the heavy metal solution extraction hose is fixed on the EKG electrode fixing plate, the lower end extends into the soil heavy metal solution collection tank, the upper end passes through the peristaltic pump and communicates with the soil heavy metal solution storage tank, and the eluent penetration device is used to disperse the eluent Into the soil, a water guide groove is formed on the EKG electrode, which is used to guide the soil heavy metal ions leached out after the EKG electrode is energized into the soil heavy metal solution collection tank, and the peristaltic pump is used to pump the soil heavy metal solution from the soil heavy metal solution collection tank into the leaching - Soil heavy metal solution storage tank on the electric cooperative operation platform.

Further, the EKG electric removal module also includes an EKG electrode protection plate, and there is a certain distance between the EKG electrode protection plate and the EKG electrodes. Pulling out the EKG electrode protection plate can prevent soil particles from clogging the EKG electrode water guide groove to the greatest extent. further,

Further, the EKG electric removal module also includes a liquid level gauge installed on the EKG electrode fixing plate, and the lower end of the liquid level gauge extends into the soil heavy metal solution collection tank for real-time monitoring of the liquid level of the soil heavy metal solution collection tank , when the liquid level increases slowly or remains unchanged, start the peristaltic pump to pump the soil heavy metal solution from the soil heavy metal solution collection tank into the soil heavy metal solution storage tank on the leaching-electric cooperative operation platform.

Further, the eluent permeation device includes a eluent storage tank and a perforated permeable column connected with the eluent storage tank and vertically arranged below the eluent storage tank, the length of the perforated permeable column is related to the soil pollution The thickness of the layer is the same. After the eluent is added to the eluent storage tank, it is dispersed into the soil pollution layer through the perforated permeable column.

Further, the EKG electrode fixing plate and the EKG electrode protection plate are plugged and fixed on the upper part of the soil heavy metal solution collection tank.

Further, the upper part of the soil heavy metal solution collection tank is provided with an EKG electrode fixing plate slot and an EKG electrode protection plate slot, and the EKG electrode fixing plate and the EKG electrode protection plate are plugged into the EKG electrode fixing plate slot and the EKG electrode protection plate respectively. in the slot.

Further, the soil heavy metal solution collection tank is provided with a hollow cavity that can accommodate the heavy metal solution.

Further, the upper ends of the EKG electrode fixing plate and the soil heavy metal solution collection tank are respectively provided with reserved holes for the EKG electrode fixing plate and the heavy metal solution collection tank, which are used to place the liquid level gauge and the heavy metal solution extraction hose, and the heavy metal solution extraction hose. The lifting hose and the lower end of the liquid level gauge extend into the hollow cavity from the reserved hole of the metal solution collection tank.

Further, the EKG electrode includes a conductive copper wire, an EKG electrode conductive material, a geotextile wrapped with the EKG conductive material, and an EKG electrode water guide groove, and an EKG electrode water guide groove is formed on the surface of the EKG electrode conductive material from top to bottom.

A method for in-situ leaching and EKG electric synergistic removal of heavy metals in soil is characterized in that the above-mentioned device is used to carry out, and the method comprises the following steps:

Start-up of in-situ leaching and EKG electric cooperative removal: Add eluent to the eluent penetration device, and the eluent will disperse into the soil through the eluent penetration column of the eluent penetration device. The length of the penetration column is related to the thickness of the soil cultivation layer Similarly, the EKG electrode is connected to a DC regulated power supply, and under the action of the EKG electric field, the eluent performs in-situ leaching on the heavy metal-contaminated soil, and the eluted heavy metal ions and soil pore water, under the action of electromigration and electrodialysis Migration to the EKG electrode of the EKG electrokinetic removal module;

Separation and removal of heavy metals in soil: The heavy metal solution migrated to the surface of the EKG electrode flows along the EKG electrode water guide channel through the soil heavy metal solution guide channel to the soil heavy metal solution collection tank of the EKG electric removal module under the action of gravity, and the liquid level gauge monitors the soil in real time The liquid level height of the heavy metal solution collection tank, start the peristaltic pump in time to pump the heavy metal solution from the soil heavy metal solution collection tank into the soil heavy metal solution collection tank on the leaching-electric cooperative operation platform, to achieve the separation and in-situ removal of heavy metals Purpose;

Timely collect the target heavy metal concentration of the solution extracted from the soil heavy metal solution collection tank, and measure the target heavy metal content of the treated soil. When the soil heavy metal content reaches the standard or the target heavy metal concentration of the soil heavy metal solution collection tank is low, the treatment can be ended .

Beneficial effect of the present invention and significant technical progress are as follows:

1. Modular design of electric repair device, which can be assembled and arranged for leaching and electric repair, integrated consideration of heavy metal contaminated soil leaching, collection of heavy metal solution from leaching in soil, separation of heavy metal solution from soil leaching, etc., realizing soil The in-situ leaching and water-soil separation of heavy metals can remove the leached heavy metals from the soil to the greatest extent, and the repair period is short and the effect is quick.

2. EKG with water conduction and conduction functions is used as the electrode, and a pluggable slot-type EKG electric removal module with a three-layer structure is designed to facilitate the on-site installation and engineering application of the EKG electrode. Use the EKG electrode fixing plate to inlay and install the EKG electrode to ensure that the EKG electrode is flat and in full contact with the soil in the polluted layer. The EKG electrode protection plate is used to prevent soil particles from clogging the EKG water guide groove, and to maximize the performance of EKG electroosmotic dehydration and electromigration to remove heavy metals.

3. The eluent penetration device is equipped on the leaching-electric cooperative operation platform, and functions such as eluent replenishment and high-efficiency dispersion are designed. The width of the eluent penetration device is the same as that of the EKG electrode. The length of the permeation column is the same as the soil depth of the polluted layer, so that the eluent can fully contact the soil polluted layer in all directions under the drive of the EKG electric field, and the leaching efficiency of the heavy metal polluted soil can be improved.

4. The EKG electric removal module is designed with a soil heavy metal solution collection tank, and a liquid level gauge and a heavy metal solution extraction hose are left in the EKG electrode fixing plate, which can quickly collect, monitor and discharge the heavy metal solution of the EKG electric removal module. The liquid level gauge is coupled with the heavy metal solution extraction hose and the EKG electric removal module. The device has compact structure, complete functions and high space utilization efficiency.

5. The EKG electric removal module and the rinsing-electric cooperative operation platform are assembled design, which is easy and fast to install, and can be mass-produced. Multiple EKG electric removal modules can be spliced according to site requirements, which has the basis for large-scale application.

Description of drawings

Fig. 1 is a structural schematic diagram of the device for removing heavy metals in soil in combination with assembled in-situ leaching and EKG electric operation in accordance with the present invention;

Fig. 2 is A-A sectional view in Fig. 1;

Fig. 3 is B-B sectional view in Fig. 1;

Fig. 4 is the structural representation of EKG electrode among the present invention;

Fig. 5 is a cross-sectional view of the eluent permeation device in the present invention.

In the figure: 1-EKG electric removal module, 2-wire, 3-washing-electric cooperative operation platform, 4-DC stabilized power supply, 5-soil heavy metal solution collection tank, 6-soil heavy metal solution transfer hose, 7- Peristaltic pump, 8-eluent penetration device, 9-EKG electrode fixing plate, 10-EKG electrode (10-1-conductive copper wire, 10-2-geotextile wrapped EKG conductive material, 10-3-EKG electrode conductor Sink, 10-4-EKG electrode conductive material), 11-EKG-electrode protection plate, 12-hollow cavity, 13-EKG electrode fixing plate slot, 14-EKG electrode protection plate slot, 15-soil heavy metal solution guide Launder, 16-soil heavy metal solution extraction hose, 17-EKG electrode fixed plate reserved hole, 18-reserved hole for heavy metal solution collection tank, 19-soil heavy metal solution collection tank, 20-liquid level gauge, 21-shower Eluent permeation column, 22-washer, 23-fixing screw, 24-eluent storage tank, 25-eluent adding port.

detailed description

The technical solutions in the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the present invention.

Figure 1 is a schematic structural view of the device for the combined in-situ leaching and EKG electric cooperative removal of heavy metals in soil according to the present invention. Electric removal module 1 and a rinsing-electric cooperative operation platform 3. The leaching-electric collaborative operation platform 3 is equipped with a DC stabilized power supply 4 , a leaching solution penetration device 8 , a peristaltic pump 7 , a heavy metal solution extraction hose 6 and a soil heavy metal solution storage tank 5 .

Please refer to FIG. 2 and FIG. 3 , the EKG electrodynamic removal module 1 includes an EKG electrode fixing plate 9 , an EKG electrode 10 , an EKG electrode protection plate 11 , a liquid level gauge 20 and a soil heavy metal solution collection tank 19 .

The eluent permeation device 8 is installed on the eluent-electric cooperative operation platform 3 approximately as wide as the EKG, and the space between the eluent permeation device 8 and the eluent-electric cooperative operation platform 3 is sealed with a gasket 22 and tightened with screws 23 , to prevent the eluent from overflowing to the eluent-electric cooperative operation platform.

As shown in FIG. 5 , the eluent permeation device 8 includes a eluent storage tank 24 and a perforated permeation column 21 that communicates with the eluent storage tank 24 and is vertically arranged below the eluent storage tank 24 . The length of the column 21 is the same as the thickness of the soil contamination layer. After the eluent is added to the eluent liquid storage tank 24, it is dispersed into the soil contamination layer through the perforated permeation column 21.

The soil heavy metal solution collection tank 19 is provided with a hollow cavity 12, and the EKG electrode fixing plate 9 and the EKG electrode protection plate 11 are plugged in the soil heavy metal solution collection tank 19 top, as shown in Figure 3, the soil heavy metal solution collection tank 19 tops are provided with There are EKG electrode fixing plate slot 13 and EKG electrode protection plate slot 14, EKG electrode fixing plate 9 and EKG electrode protection plate 11 are plugged into EKG electrode fixing plate slot 13 and EKG electrode protection plate slot 14 respectively. The slot 13 of the EKG electrode fixing plate 9 can also prevent soil particles from entering the hollow cavity 12 of the heavy metal solution collection tank when the heavy metal solution is extracted.

The EKG electrode fixing plate 9 is fixed with the EKG electrode 10. For example, the EKG electrode 10 can be fixed side by side on the EKG fixing plate 9 with expansion rivets.

In order to ensure that the EKG electrode 10 is flat and in all-round contact with the soil profile, there is a certain distance between the EKG electrode protection plate 11 and the EKG electrode 10, which is used to prevent soil particles from clogging the EKG electrode water guide groove to the greatest extent after the EKG electrode protection plate 11 is pulled out 10-3.

The upper ends of the EKG electrode fixing plate 9 and the soil heavy metal solution collection tank 19 are respectively provided with a reserved hole 17 for the EKG electrode fixing plate and a reserved hole 18 for the heavy metal solution collection tank for placing the liquid level gauge 20 and the heavy metal solution extraction hose 16. The heavy metal solution extraction hose 16 and the liquid level gauge 20 can pass through the EKG electrode fixing plate 9, and the lower end extends into the hollow cavity 12 from the reserved hole 18 of the metal solution collection tank.

As shown in Figure 4, the EKG electrode 10 includes a conductive copper wire 10-1, an EKG electrode conductive material 10-4, a geotextile 10-2 wrapping the EKG conductive material 10-4, an EKG electrode water guide groove 10-3, and an EKG electrode conductive material 10-4. The surface of the electrode conductive material 10-4 forms an EKG electrode water guide groove 10-3 from top to bottom.

Two EKG electric removal modules 1 and the leaching-electric cooperative operation platform 3 are assembled through the card slot, and the DC stabilized power supply 4 is connected, and the soil pore water and the soil heavy metal ions leached out can be gradually migrated to the The water guide tank 10-3 of the EKG electrode 10 enters the soil heavy metal solution collection tank 19 under the action of gravity.

The liquid level gauge 20 is installed in the EKG fixed plate to monitor the liquid level height of the soil heavy metal solution collection tank in real time. When the liquid level height increases slowly or remains unchanged, the peristaltic pump 7 is started to pump the soil heavy metal solution from the soil heavy metal solution collection tank 19. Enter the soil heavy metal solution storage tank 5 on the leaching-electric cooperative operation platform 3.

In this example, the farmland polluted by heavy metals is taken as the object, and the steps of in-situ leaching and EKG electric synergistic removal of heavy metals using the device shown in Figure 1 are as follows:

(1) On-site investigation of heavy metal contaminated soil. Collect heavy metal contaminated soil samples according to "Soil Testing Part 1: Collection, Processing and Storage of Soil Samples (NY/T 1121.1-2006), and measure the physical and chemical properties of soil pH, organic matter content, moisture content, soil particle size composition, etc.; After the soil sample is pretreated, the heavy metal content is determined by ICP-MS or AAS, and the target heavy metal to be processed is determined.

(2) The EKG electrode 10 is fixed. Fix the EKG electrode 10 on the EKG electrode fixing plate 9 with expansion rivets, connect the single EKG electrodes 10 in series with wires as required, and splice larger EKG electrodes;

(3) Assemble the EKG electric removal module 1 . The EKG electrode fixing plate 9 and the EKG electrode protection plate 11 and the soil heavy metal solution collection tank 19 are assembled using the draw-in slots (13, 14), and the reserved holes (17 18) Insert the heavy metal solution extraction hose 16 and liquid level gauge 20 into the hollow cavity 12 of the soil heavy metal solution collection tank 19, then insert the assembled EKG electric removal module 1 into the heavy metal contaminated soil, and pull out the EKG electrode Protection plate 11;

(4) Construction of in-situ elution and EKG electrokinetic coordination system. Two EKG electric removal modules 1 are installed on the rinsing-electric cooperative operation platform 3 by using the card slot. The distance between the two EKG electrodynamic removal modules 1 is related to the available voltage of the DC stabilized power supply 4 and the voltage gradient of the EKG electrodynamic restoration. Generally speaking, the voltage gradient is 2-4V/cm, and the distance between EKG electric removal modules 1 is not higher than 50cm. Install a DC stable power supply 4, a eluent penetration device 8, a peristaltic pump 7, a soil heavy metal solution extraction hose 6 and a soil heavy metal solution storage tank 5 on the leaching-electric cooperative operation platform 3;

(5) In situ leaching and EKG electrokinetic coordinated removal start. Add eluent (such as FeCl ₃ and calcium chloride) in eluent permeation device 8, eluent is dispersed into soil by eluent permeation column 21 of eluent permeation device 8, and permeation column length and soil plowing layer The thickness is the same (about 25cm), the EKG electrode 10 is connected to the DC stabilized voltage power supply 4, and under the action of the EKG electric field, the eluent carries out in-situ elution to the heavy metal contaminated soil, and the heavy metal ions and soil pore water eluted are separated in the electric field. Migrate to the EKG electrodes 10 of the two EKG electrodynamic removal modules 1 under the action of migration and electrodialysis;

(6) Separation and removal of heavy metals in soil. The heavy metal solution migrated to the surface of the EKG electrode 10 flows to the soil heavy metal solution collection tank 19 of the EKG electric removal module 1 along the EKG electrode water guide channel 10-3 through the soil heavy metal solution guide channel 15 under the action of gravity, and the liquid level gauge 20 real-time Monitor the liquid level height of the soil heavy metal solution collection tank 19, and start the peristaltic pump 7 in time to draw the heavy metal solution from the soil heavy metal solution collection tank 19 into the soil heavy metal solution collection tank 5 on the soil heavy metal solution collection tank 3 for leaching-electric cooperative operation platform, to reach the heavy metal water- Soil separation and in situ removal purposes.

(7) Collect the target heavy metal concentration of the solution extracted from the soil heavy metal solution collection tank 19 in time, and measure the target heavy metal content of the treated soil. When the soil heavy metal content reaches the standard or the soil heavy metal solution collection tank 19 extracts the solution target heavy metal concentration. , to end processing.

(8) For on-site application, according to the processing degree and time limit requirements, it can be processed multiple times in the same area or quickly processed in a large area after assembly. The rinsing-electric cooperative operation platform 3 can use alternating current to supply power for the DC stabilized power supply, and when it is inconvenient to supply power in the field, batteries can also be used to replace the DC stabilized voltage power supply.

The above is only a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto, any changes or substitutions that can be easily imagined by those skilled in the art within the technical scope disclosed in the present invention, All should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be determined by the protection scope of the claims.

Claims (10)

1. a kind of pin-connected panel original position drip washing is electronic with EKG cooperates with the device for removing heavy metal-polluted soil, it is characterised in that：Including drenching Wash-electronic work compound platform (3), be installed on drip washing-electronic work compound platform (3) for insert the EKG in soil electricity Dynamic removal module (1) and power supply, leacheate permeability apparatus (8), peristaltic pump (7), heavy metal-polluted soil solution storage tanks (5), institute The electronic removal modules (1) of EKG are stated including ekg electrode fixed plate (9) and the ekg electrode of ekg electrode fixed plate (9) is fixed on (10), heavy metal-polluted soil solution collecting tank (19), ekg electrode (10) and peristaltic pump (7) are connected with power supply, heavy metal solution extracting Flexible pipe (6) is fixed on ekg electrode fixed plate (9), and heavy metal-polluted soil solution collecting tank (19) is stretched into lower end, and upper end passes through peristaltic pump (7) afterwards with heavy metal-polluted soil solution storage tanks (5) UNICOM, leacheate permeability apparatus (8) for leacheate to be dispersed into soil, Guiding gutter (10-3) is formed with ekg electrode (10), for the soil heavy metal ion for going out drip washing after ekg electrode (10) energization Heavy metal-polluted soil solution collecting tank (19) is imported, peristaltic pump (7) is for heavy metal-polluted soil solution to be received from heavy metal-polluted soil solution Collection groove (19) is pumped into the heavy metal-polluted soil solution storage tanks (5) on drip washing-electronic work compound platform (3).

2. pin-connected panel original position drip washing as claimed in claim 1 is electronic with EKG cooperates with the device for removing heavy metal-polluted soil, its feature It is：The electronic removal modules (1) of EKG also include ekg electrode protection board (11), ekg electrode protection board (11) and ekg electrode (10) it is spaced in intervals between, ekg electrode protection board (11) is extracted afterwards can to greatest extent avoid soil particle from blocking ekg electrode Guiding gutter (10-3).

3. pin-connected panel original position drip washing as claimed in claim 1 is electronic with EKG cooperates with the device for removing heavy metal-polluted soil, its feature It is：The electronic removal modules (1) of EKG also include the liquid level gauge (20) being installed in ekg electrode fixed plate (9), liquid level gauge (20) lower end is stretched into heavy metal-polluted soil solution collecting tank (19), for the liquid of real-time monitoring heavy metal-polluted soil solution collecting tank Face highly, after liquid level increasess slowly or be constant, starts peristaltic pump (7) heavy metal-polluted soil solution is molten from heavy metal-polluted soil Liquid collecting tank (19) is pumped into the heavy metal-polluted soil solution storage tanks (5) on drip washing-electronic work compound platform (3).

4. pin-connected panel original position drip washing as claimed in claim 1 is electronic with EKG cooperates with the device for removing heavy metal-polluted soil, its feature It is：The leacheate permeability apparatus (8) including leacheate accumulator tank (24) and with leacheate accumulator tank (24) UNICOM and vertically Infiltration post (21) with holes below leacheate accumulator tank (24), the length and soil pollution thickness degree of infiltration post (21) with holes It is identical, after leacheate is added to leacheate reservoir (24), soil pollution layer is dispersed into through infiltration post (21) with holes.

5. pin-connected panel original position drip washing as claimed in claim 2 is electronic with EKG cooperates with the device for removing heavy metal-polluted soil, its feature It is：Ekg electrode fixed plate (9) and ekg electrode protection board (11) grafting are fixed on heavy metal-polluted soil solution collecting tank (19) Portion.

6. pin-connected panel original position drip washing as claimed in claim 5 is electronic with EKG cooperates with the device for removing heavy metal-polluted soil, its feature It is：Heavy metal-polluted soil solution collecting tank (19) top is provided with ekg electrode fixed plate draw-in groove (13) and ekg electrode protection board draw-in groove (14), ekg electrode fixed plate (9) and ekg electrode protection board (11) are plugged on ekg electrode fixed plate draw-in groove (13) and EKG respectively In electrode protection board groove (14).

7. pin-connected panel original position drip washing as claimed in claim 3 is electronic with EKG cooperates with the device for removing heavy metal-polluted soil, its feature It is：The hollow cavity (12) that can accommodate heavy metal solution is provided with heavy metal-polluted soil solution collecting tank (19).

8. pin-connected panel original position drip washing as claimed in claim 7 is electronic with EKG cooperates with the device for removing heavy metal-polluted soil, its feature It is：Ekg electrode fixed plate (9) and heavy metal-polluted soil solution collecting tank (19) upper end are respectively equipped with ekg electrode fixed plate and reserve Hole (17) and heavy metal solution collecting tank preformed hole (18), for placing liquid level gauge (20) and heavy metal solution extracting flexible pipe (16), heavy metal solution extracting flexible pipe (16) and liquid level gauge (20) lower end are stretched into hollow from metallic solution collecting tank preformed hole (18) In cavity (12).

9. pin-connected panel original position drip washing as claimed in claim 1 is electronic with EKG cooperates with the device for removing heavy metal-polluted soil, its feature It is：The ekg electrode (10) includes conductive copper wire (10-1), ekg electrode conductive material (10-4), parcel EKG conductive materials The geotextiles (10-2) of (10-4), ekg electrode guiding gutter (10-3), ekg electrode conductive material (10-4) surface are formed by up to Under ekg electrode guiding gutter (10-3).

10. a kind of drip washing in situ is electronic with EKG cooperates with the method for removing heavy metal-polluted soil, it is characterised in that usage right requirement 1- Device any one of 9 is carried out, and methods described comprises the following steps：

Drip washing in situ is electronic with EKG to cooperate with removal to start：The addition leacheate in leacheate permeability apparatus (8), leacheate passes through The leacheate of leacheate permeability apparatus (8) permeates post (21) and is dispersed into soil, permeates column length and plough horizon thickness phase Together, ekg electrode (10) connects D.C. regulated power supply (4), and under EKG electric field actions, leacheate heavy metal contaminated soil is carried out Drip washing in situ, the heavy metal ion for eluting and soil pore water, to the electronic removals of EKG in the presence of electromigration and electrodialysis Ekg electrode (10) migration of module (1)；

Heavy metal-polluted soil is separated and removal：The heavy metal solution on ekg electrode (10) surface is moved under gravity along EKG Electrode guiding gutter (10-3) flows to the heavy metal-polluted soil of the electronic removal modules (1) of EKG through heavy metal-polluted soil solution guiding gutter (15) Solution collecting tank (19), the liquid level of liquid level gauge (20) real-time monitoring heavy metal-polluted soil solution collecting tank (19) starts in time From heavy metal-polluted soil solution collecting tank (19) be pumped on drip washing-electronic work compound platform (3) heavy metal solution by peristaltic pump (7) Heavy metal-polluted soil solution collecting tank (5), reach heavy metal water-soil and separate purpose with removal in situ；

Collection heavy metal-polluted soil solution collecting tank (19) in time extracts the target heavy metal concentration of solution, and measure is subject to processing Soil target content of beary metal, when heavy metal content in soil is up to standard or heavy metal-polluted soil solution collecting tank (19) extracted solution target When heavy metal concentration is relatively low, you can end is processed.