CN215745485U - Electrode assembly for heavy metal contaminated soil treatment and electric repair system - Google Patents

Abstract

The utility model discloses an electrode assembly and an electric restoration system for treating heavy metal polluted soil, wherein the electrode assembly comprises an adsorption reaction tube, the adsorption reaction tube comprises a cavity which is enclosed by an outer wall and a bottom plate and is provided with an opening at one end, the inner side of the outer wall is provided with an inner wall, the inner wall is enclosed end to divide the cavity into an inner cavity and an outer cavity, the outer wall and the inner wall are provided with water permeable holes, the surface of the outer wall is attached with a first filter layer, the surface of the inner wall is attached with a second filter layer, a heavy metal adsorption material is filled in the outer cavity, an electrode liquid outlet pipe and an electrode liquid return pipe are respectively arranged in the inner cavity, and the electrode is communicated with a power supply. The utility model combines an electric repair technology with an adsorption method, pollutants are simultaneously transferred to the heavy metal adsorption material in the adsorption reaction tube under the action of electric power, and the adsorption reaction tube is removed after the repair is finished, so that the in-situ removal of the heavy metals is realized.

Description

Electrode assembly for heavy metal contaminated soil treatment and electric repair system

Technical Field

The utility model relates to the technical field of electric restoration, in particular to an electrode assembly and an electric restoration system for heavy metal contaminated soil treatment.

Background

With the development of economic society, the pollution of farmland soil is gradually intensified, and the pollution poses serious threats to ecological environment and human health. Currently, the current practice is. Soil pollution has become the third environmental pollution worldwide in addition to atmospheric, water body pollution. In China, polluted farmland is up to 8000 ten thousand hm2, and accounts for 63.5% of the farmland area in China. Therefore, remediation of contaminated farmland soil is a major problem to be solved urgently.

The repair technology of heavy metal contaminated soil is various, and mainly comprises a physical method, a chemical method, a biological method or a coupling method of a plurality of methods. The electrodynamics repairing technology utilizes two electrodes inserted into soil to apply an electric field at two ends of the polluted soil, and under the combined action of electrochemistry and electrodynamics, pollutants which are water-soluble or adsorbed on the surface layer of soil particles move to a positive electrode and a negative electrode according to different charges, so that the pollutants are enriched or recycled near the electrodes, and the aim of cleaning the soil is fulfilled.

In recent years, research and application of electric remediation technology for heavy metal contaminated soil are receiving much attention. The majority of domestic electric repair research is in the laboratory research stage, and the research is mainly carried out by a small-sized test device with a direct-current power supply, electrodes, an electrolytic bath and a soil chamber. The distance between the cathode and the anode of the device is only about 20cm, and the device cannot be directly used for on-site repair. In addition, the efficiency of removing the heavy metal in the middle of the soil is not high, the heavy metal transferred into the electrode chamber flows back to the soil chamber in the later period of the experiment, and the efficiency of repairing the actual heavy metal contaminated soil is not ideal.

The utility model with publication number CN 109719122A discloses a treatment method and a device for removing heavy metal ions in soil (water) with an adsorbent, which comprises four parts: a direct current stabilized voltage power supply, an electrode anode, an electrode cathode and an adsorbing material. The electrode anode material uses DSA anode, the electrode cathode uses one of cadmium electrode, graphite electrode, zinc electrode, brass electrode and lead electrode according to different soil (or water), the adsorbent selects one or two of zeolite, active carbon and chitosan. The activated carbon adsorbent and the DSA anode are wrapped by a double-layer wire mesh and fixed on one side of the electrolytic tank, and the activated carbon adsorbent and the graphite cathode electrode are wrapped by the double-layer wire mesh and fixed on the other side of the electrolytic tank. Under the action of an electric field, heavy metal ions (including heavy metal acid radical ions) move to the cathode (or the anode), and can be reduced to low-valence metal ions or metal simple substances at the cathode (or the anode) or adsorbed by the adsorbents at the anode and the cathode for enrichment. The utility model discloses a to pollute soil arranges the electrolysis trough in and handles, need wrap up adsorbent and electrode with double-deck wire mesh, complex operation is not convenient for directly be used for soil normal position to restore.

Therefore, the research and development of a device capable of quickly removing heavy metals in soil and directly used for soil in-situ remediation are urgently needed, and the device plays a vital role in improving the soil environment quality, protecting the ecological environment and stably producing crops and grains, and realizing high yield and safe production.

Disclosure of Invention

The utility model aims to solve the technical problem that aiming at the defects of the prior art, the utility model provides the electrode assembly for heavy metal contaminated soil treatment, which can be directly used for in-situ soil remediation and is convenient to operate.

The utility model provides an electrode subassembly for heavy metal contaminated soil administers, includes the adsorption reaction pipe, the adsorption reaction pipe includes and encloses the one end open-ended that closes by outer wall and bottom plate and holds the chamber, the outer wall inboard is equipped with the inner wall, the inner wall encloses to close and will hold the chamber and divide into interior appearance chamber and outer appearance chamber two parts end to end, the outer wall with seted up the hole of permeating water on the inner wall, the surface of outer wall is attached to have first filter layer, the surface of inner wall is attached to have the second filter layer, it has heavy metal adsorption material to fill in the outer appearance chamber, be equipped with electrode, electrode liquid drain pipe and electrode liquid return line in the content chamber respectively, electrode and power intercommunication.

The electrode assembly combines an electric repairing technology with an adsorption method, and pollutants in soil directionally migrate under the action of the electrode and are absorbed by the heavy metal adsorption material in the accommodating cavity. When the electrode assembly is used, the electrode assembly is directly placed in the polluted soil, so that the in-situ remediation of the polluted soil is realized, and the operation is convenient.

The electrode assemblies are usually used in pairs, wherein an anode electrode bar is placed in one electrode assembly, a cathode electrode bar is placed in the other electrode assembly, an electrode liquid outlet pipe is communicated with a working liquid storage barrel, and an electrode liquid return pipe is communicated with a waste liquid barrel.

Further, the electrode assembly further comprises a top wall, and the top wall seals the top of the cavity between the outer wall and the inner wall and is fixedly connected with the outer wall and the inner wall respectively.

Further, the electrode assembly further comprises a handle fixedly mounted to the upper surface of the top wall. After the material is adsorbed and saturated, the electrode assembly can be lifted by the lifting handle, and the electrode assembly is replaced again or the next polluted soil is repaired.

Further, in order to prevent the electrode liquid from corroding the adsorption reaction tube, the outer wall, the inner wall, the bottom plate and the top wall are made of corrosion-resistant hard materials.

Further, the electrode assemblies are arranged in an even number, wherein the electrodes in one half of the electrode assemblies are anode electrodes, the electrodes in the other half of the electrode assemblies are cathode electrodes, the anode electrodes are connected in series, the cathode electrodes are connected in series, and the anode electrode circuits and the cathode electrode circuits are connected in parallel.

The utility model also discloses an electric restoration system for heavy metal contaminated soil treatment, which comprises an electrode working solution unit and the electrode assembly, wherein the electrode working solution unit comprises a working solution storage barrel and a waste liquid barrel, the working solution storage barrel is communicated with the electrode solution outlet pipe through an infusion pump, and the waste liquid barrel is communicated with the electrode solution return pipe through a waste liquid lifting pump.

Under the action of the electric field force, anions in the contaminated soil on the inner side of the electrode assembly migrate toward the anode, and cations migrate toward the cathode. Heavy metal cations in the polluted farmland soil can be enriched in the adsorption material of the electrode assembly or enter into the cathode electrolyte, so that the content of harmful heavy metal ions in the farmland soil is reduced, and the aim of restoring the farmland soil is fulfilled.

Further, electronic repair system still includes mobile device, auxiliary unit and energy power unit, mobile device includes roof and bottom plate, seted up in proper order on the bottom plate and held the groove that electrode subassembly passed through, the quantity in groove with electrode subassembly's quantity is unanimous, auxiliary unit including install in track on the roof, install respectively in drilling equipment and elevating gear on the track, drilling equipment and elevating gear all can follow the track removes, the groove is located under the track, drilling equipment can descend and pass through the groove to punch in soil, elevating gear can drive electrode subassembly reciprocates.

Further, electronic repair system still includes the control unit, the control unit respectively with drilling equipment with elevating gear's driving motor, the transfer pump with waste liquid elevator pump electricity is connected. And setting corresponding parameters of the adjusting device, so that the treatment efficiency of the heavy metal pollution remediation system can be adjusted and controlled within variables.

Further, the energy power unit comprises a direct current power system and a solar power system, the solar power system comprises a solar cell array, a controller and a storage battery, the solar cell array is installed above the top plate and is sequentially electrically connected with the controller, the storage battery and the direct current power system. The solar energy is adopted for power supply, so that the solar mobile water heater is convenient for outdoor mobile use.

Further, the adsorbing material is one or more of activated carbon, biochar and steel slag.

Compared with the prior art, the utility model has the beneficial effects that:

(1) the electrode assembly can be directly and automatically controlled, is directly placed into the polluted soil by using the lifting device, is used for in-situ soil remediation, and is convenient to operate;

(2) the utility model combines the electric repair technology and the adsorption method, pollutants are simultaneously transferred to the heavy metal adsorption material in the adsorption reaction tube under the action of electric power, and the adsorption reaction tube is removed after the repair is finished to realize the in-situ removal of the heavy metals, so that the heavy metals transferred to the electrode chamber are prevented from flowing back to the soil chamber in the later period of the experiment, and the problem of soil pollution is fundamentally solved;

(3) the vehicle-mounted farmland soil heavy metal pollution in-situ remediation system is developed in an integrated manner, realizes a mobile in-situ quick remediation mode for soil heavy metal pollution treatment, and can be used for remediation of farmland polluted soil with large area and shallow pollution depth;

(4) the system has the functions of early-stage equipment installation and repair operation, has high automation degree, can reduce labor cost, can continuously operate, has the characteristics of high speed, high efficiency and the like, and can shorten the construction period;

(5) the remediation system utilizes clean energy generated by solar energy or wind power generation, is energy-saving and environment-friendly, and reduces the soil remediation cost;

(6) the utility model is not only suitable for the remediation of inorganic (heavy metal and the like) polluted soil, but also suitable for the remediation of organic and radionuclide polluted soil.

Drawings

FIG. 1 is a cross-sectional view of an adsorption reaction tube.

FIG. 2 is a schematic perspective view of an adsorption reaction tube.

FIG. 3 is a schematic diagram of a framework of an electric heavy metal contaminated farmland remediation system.

FIG. 4 is a schematic front section view of an electric heavy metal contaminated farmland remediation system.

FIG. 5 is a schematic plan view of an electric heavy metal contaminated farmland remediation system.

In the figure: 1-double layer mobile device, 11-top plate, 12-bottom plate, 13-groove;

2-energy power unit, 21-direct current power system, 22-solar power generation system, 221-solar cell array, 222-controller, 223-storage battery;

3-electrode working solution unit, 31-working solution storage barrel, 32-waste solution barrel, 33-infusion pump, 34-waste solution lifting pump, 35-electrode solution outlet pipe and 36-electrode solution return pipe;

4-auxiliary unit, 41-track, 42-drilling device, 43-lifting device;

5-an electrode assembly, 51-an adsorption reaction tube, 511-an outer wall, 512-an inner wall, 513-a bottom wall, 514-a top wall, 515-a heavy metal adsorption material, 516-a first filter layer, 517-a second filter layer, 518-a handle, 521-an anode electrode rod, 522-a cathode electrode rod, 523-a lead and 524-an inner cavity;

6-a control unit.

Detailed Description

As shown in figure 3, the movable contaminated soil electrokinetic remediation system consists of an energy power unit 2, an electrode working solution unit 3, an auxiliary unit 4, an electrode assembly 5 and a control unit 6, which are carried by a double-layer movable device 1.

As shown in fig. 4, the double-deck movable apparatus 1 is of a crawler type. The compartment comprises a top plate 11 and a bottom plate 12. The bottom plate is square, and the side length is 2.5 m. The grooves are arranged at the positions of the tracks staggered near four corners of the square, the hole diameter is 20cm, and the center distance between every two adjacent holes is 2 m. The track 41 and the drilling device 42 are arranged on the top plate 11 of the double-layer movable device 1, and the electrode working solution unit 3 and the direct-current power supply system 7 are arranged on the bottom plate 12 of the double-layer movable device 1. When the system does not work, the adsorption reaction tube 4 and the electrode system can be placed on the bottom plate 12 of the double-layer movable device.

The energy power unit 2 includes a direct current power supply system 21 and a solar power generation system 22. The dc power supply system 21 is a power supply system mainly powered by solar energy and secondarily powered by a generator. The DC output voltage of the DC power transformer 6 is 0-220V, and the voltage gradient is 1-2V/cm. The solar power generation system 22 includes a solar cell array 221, a controller 222, and a storage battery 223. The solar cell array 221 is mounted on the top plate 11 of the movable device and is connected with the controller 222, the storage battery 223 and the direct-current power supply system 21 in sequence through leads.

As shown in fig. 5, the electrode working solution unit 3 includes a working solution storage barrel 31, a waste solution barrel 32, an infusion pump 33, a waste solution lift pump 34, an electrode solution outlet pipe 35, and an electrode solution return pipe 36. The working solution storage barrel 31 and the waste liquid barrel 32 are PE water tanks. The working liquid storage barrel 31, the waste liquid barrel 32, the infusion pump 33 and the waste liquid lifting pump 34 are all positioned on the double-layer movable device bottom plate 12 and avoid the position of the hole. The working liquid storage barrel 31 is sequentially connected with a four-channel distribution type infusion pump 33 and four electrode liquid outlet pipes 35, and the waste liquid barrel 32 is sequentially connected with four groups of waste liquid lifting pumps 34 and electrode liquid return pipes 36.

As shown in fig. 4, the auxiliary unit 4 includes an aluminum alloy rail 41, a drilling device 42 that can travel along the rail, and a lifting device 43. The track 41 is a square with the side length of 2m, is positioned above the bottom plate 12 of the double-layer movable device and is parallel to the bottom plate 12, and four top points of the track correspond to the circle centers of four grooves 13 of the lower-layer floor and are connected with the top plate 11 of the double-layer movable device 1. The drilling device 42 includes a drive motor and a drill bit. The output end at the bottom of the driving motor is provided with a spiral drill bit through a coupler, and the driving motor can move along the track. The lifting device 43 is embodied as a pneumatic hoist for movement of the electrode assembly adsorption reaction tube 41 and the electrode system 42.

As shown in fig. 1-2, the electrode assembly 5 includes an adsorption reaction tube 51 and an electrode system 52. The adsorption reaction tube 51 is a thick-wall barrel-shaped structure and is composed of an outer wall 511 and an inner wall 512 which are coaxial annular structures, a bottom wall 513 and a top wall 514, and a heavy metal adsorption material 515 filled in an annular accommodating area among the inner wall 511, the outer wall 512, the bottom wall 512 and the top wall 513. The inner wall 512 and the outer wall 511 may be made of corrosion-resistant perforated hard plastic, and a layer of filter material 516 and 517, which may be filter paper or filter cloth, is attached to the outer side of the inner wall 512 and the inner side of the outer wall 511, respectively. The bottom wall 513 and the top wall 514 enclose a corrosion resistant rigid panel, and a handle 518 is provided on the exterior of the top panel, the handle 518 being connectable to a lifting device. The adsorption reaction tube 51 may be driven to move up and down by the elevating device 43.

Electrode system 52 includes 2 sets of anodes and 2 sets of cathodes. 2 groups of the anode electrode bars 521 or the cathode electrode bars 522 connected in series are connected in parallel and connected with the direct current power supply system 11 through a lead 523. The electrode bar is made of graphite, and a lifting handle is arranged at the top end of the electrode and can be connected with the lifting device 43.

The control unit 6 is integrated in the cab, electrically connected with the lifting device 43, the driving motor of the drilling device 42, the infusion pump 33 of the electrode working fluid unit and the waste liquid lifting pump 34, and set corresponding parameters of the adjusting device, so that the treatment efficiency of the heavy metal pollution remediation system can be adjusted and controlled within variables. The circuit connection of the control unit and the drilling device is the prior art, and can refer to an automatic positioning hole-rotating device for producing cable slots (patent number: 201921188590.X), or to an automatic control circuit design course design (https:// wenku.baidu.com/view/d70eb157d0f34693daef5ef7ba0d4a7303766c8c. html) for controlling the drilling device to drill holes in soil. The control unit is used for controlling the operation of the infusion pump 33 and the waste liquid lift pump 34, the specific circuit connection is the prior art, and the control unit can refer to a circuit between a control device and a drug injection pump in the Chinese patent with the application number of 202021704251.5, or a water pump liquid level control circuit schematic diagram (http:// www.gky-ywkz. com/GKYznywkzyhbjkzq/27.html) for controlling the opening and closing and the flow rate of the infusion pump 33 and the waste liquid lift pump 34. The control unit can control the solar power generation system by referring to a solar-based electric power soil remediation system (application number: 201721036613.6) or the working principle of a solar controller (http:// www.elecfans.com/article/88/131/taiyangnen/2018/20180327653025_2.html), and the control unit controls the solar power generation system to supply power to each component. In summary, the above circuit connections are all prior art and will not be described in detail in the specification.

The movable type polluted soil electric remediation system combines an electric remediation technology with an adsorption method, and pollutants are simultaneously transferred into a heavy metal adsorption material in an adsorption reaction pipe under the action of electric power, so that the aim of reducing the content of heavy metals in the polluted soil is fulfilled, and the problem of soil pollution is fundamentally solved; the energy supply system, the electrode system and the working solution system are integrated in the movable device, so that a movable in-situ quick remediation mode for heavy metal pollution treatment of soil is realized, and the movable in-situ quick remediation device can be used for remediation of farmland polluted soil with large area and shallow pollution depth; the system has the functions of early-stage equipment installation and repair operation, has high automation degree, can continuously operate, has the characteristics of high speed, high efficiency and the like, and can shorten the construction period; the repair system utilizes clean energy and has the advantages of energy conservation, economy and environmental protection.

The following is a specific description of the implementation of the present invention by way of example:

suppose a piece of farmland soil polluted by cadmium is repaired, the repair area is 600 square meters, and the depth is 0.4 meter.

1) The soil is cleaned, and sundries such as vegetation, stones and the like are removed. And analyzing the properties of the soil such as pH, water content, heavy metal content and the like. The soil to be repaired is divided into repair districts, and the pH value and the water content of the soil in the repair districts are adjusted to meet the requirements of the electrodynamic force repair process.

2) The electrode working solution is potassium dihydrogen phosphate-sodium hydroxide buffer solution, and the heavy metal adsorption material 515 of the adsorption reaction tube 51 is activated carbon particles. After the heavy metal polluted farmland electric restoration system is moved to the position above a farmland soil block to be restored, the drilling device 42 in the restoration system is positioned to the top point of the track 41, and the drill bit penetrates through the opening 13 of the bottom plate of the double-layer movable device 1 to drill in the soil below the movable device 1. The hole diameter of the drill hole is 20cm, and the depth is 40 cm. After drilling, the drill bit is lifted and moved away from the top of the track.

3) The lifting device 43 is positioned at the top of the track 41, the adsorption reaction tube 51 is connected, and the adsorption reaction tube 51 is driven to pass through the double-layer movable device bottom plate opening 13 and descend into an opening in the soil below the movable device 1. After the adsorption reaction tube 51 is mounted in place, the connection between the elevating device 43 and the adsorption reaction tube 51 is released, and the elevating device 43 is lifted.

4) The anode electrode bar 521 is connected with the lifting device 43, and the lifting device 43 drives the anode electrode bar 521 to downwards pass through the opening of the double-layer movable device bottom plate 13 and descend to the cavity of the inner wall of the adsorption reaction tube 51 installed in the soil opening. After the electrode rod 521 is mounted in place, the connection between the lifting device 43 and the anode electrode rod 521 is released, and the lifting device 43 is lifted.

5) The above 1) to 4) are repeated to complete the drilling of the orbit 41 under the other 3 apexes, the installation of the adsorption reaction tube 51 and the electrode rod 521. The two groups of cathodes and the two groups of anodes are respectively positioned on the vertexes of the opposite sides of the square.

6) The working solution storage container 31 and the waste liquid barrel 32 of the electrode working solution unit 3 are respectively connected to the inner wall cavity of the adsorption reaction tube 51 through an electrode solution outlet tube 35 and an electrode solution return tube 36.

7) And (3) starting the electrode working solution unit 3 and the direct current power supply system 21, and adjusting the electric field intensity to be 1.5V/cm. The electrolyte is fed into the cavity of the inner wall of the adsorption reaction tube 51. Under the action of the direct current electric field force provided by the solar power generation system 22 and municipal power, anions in the square polluted soil with the four groups of electrodes as vertexes migrate to the anode, and cations migrate to the cathode. Heavy metal cations in the polluted farmland soil can be enriched in the heavy metal adsorption material 515 of the adsorption reaction tube 51 or enter into the cathode electrolyte, so that the content of harmful heavy metal ions in the farmland soil is reduced, and the aim of restoring the farmland soil is fulfilled.

8) And detecting the restored land soil, and after the concentration of pollutants in the land soil is reduced to a restoration target value, lifting the electrode bar 52 and the adsorption reaction tube 51 into the double-layer movable device 1 through the lifting device, so that the land soil restoration is completed.

Claims (9)

1. The utility model provides an electrode subassembly for heavy metal contaminated soil administers, its characterized in that includes adsorption reaction pipe (51), adsorption reaction pipe (51) include the one end open-ended that is enclosed by outer wall (511) and bottom plate (513) and hold the chamber, outer wall (511) inboard is equipped with inner wall (512), inner wall (512) end to end encloses and closes and divide into interior appearance chamber (524) and outer appearance chamber two parts with holding the chamber, outer wall (511) with seted up the hole of permeating water on inner wall (512), the surface of outer wall (511) is attached to have first filter layer (516), the surface of inner wall (512) is attached to have second filter layer (517), it has heavy metal adsorption material (515) to fill in the outer appearance chamber, be equipped with electrode, electrode liquid drain pipe (35) and electrode liquid return tube (36) in the content chamber respectively, the electrode communicates with the power.

2. The electrode assembly of claim 1, further comprising a top wall (514), wherein the top wall (514) closes off a top of the cavity between the outer wall (511) and the inner wall (512), and is fixedly connected to the outer wall (511) and the inner wall (512), respectively.

3. The electrode assembly of claim 2, further comprising a handle (518), wherein the handle (518) is fixedly attached to an upper surface of the top wall (514).

4. The electrode assembly according to any one of claims 1 to 3, wherein the electrode assembly is provided in an even number, wherein the electrodes in one half of the electrode assembly are anode electrodes, the electrodes in the other half of the electrode assembly are cathode electrodes, the anode electrodes are connected in series, the cathode electrodes are connected in series, and the anode electrode circuit and the cathode electrode circuit are connected in parallel.

5. An electric remediation system for heavy metal contaminated soil remediation, characterized by comprising an electrode working solution unit (3) and the electrode assembly (5) of claims 1-4, wherein the electrode working solution unit (3) comprises a working solution storage barrel (31) and a waste solution barrel (32), wherein the working solution storage barrel (31) is communicated with the electrode solution outlet pipe (35) through an infusion pump (33), and the waste solution barrel (32) is communicated with the electrode solution return pipe (36) through a waste solution lift pump (34).

6. The electric repair system according to claim 5, further comprising a moving device (1), an auxiliary unit (4) and an energy power unit (2), wherein the moving device (1) comprises a top plate (11) and a bottom plate (12), the bottom plate (12) is sequentially provided with grooves (13) for accommodating the electrode assemblies, the number of the grooves (13) is the same as that of the electrode assemblies, the auxiliary unit (4) comprises a rail (41) arranged on the top plate (11), a drilling device (42) and a lifting device (43) respectively arranged on the rail (41), the drilling device (42) and the lifting device (43) can move along the rail (41), the grooves (13) are positioned under the rail (41), and the drilling device (42) can descend through the grooves (13), and holes are punched in the soil, and the lifting device (43) can drive the electrode component to move up and down.

7. The electrical repair system according to claim 6, further comprising a control unit (6), the control unit (6) being electrically connected with the drive motors of the drilling device (42) and the lifting device (43), the infusion pump (33) and the waste lift pump (34), respectively.

8. The electrical restoration system according to any one of claims 5 to 7, wherein the energy power unit (2) comprises a DC power supply system (21) and a solar power generation system (22), the solar power generation system (22) comprises a solar cell matrix (221), a controller (222) and a storage battery (223), the solar cell matrix (221) is mounted above the roof (11) and is electrically connected with the controller (222), the storage battery (223) and the DC power supply system (21) in turn.

9. The electrical repair system of any one of claims 5 to 7, wherein the adsorbent material is one or more of activated carbon, biochar, steel slag.

Images