Heavy metal contaminated soil leaching remediation system and using method thereof

Abstract

The invention discloses a heavy metal contaminated soil leaching remediation system and a using method thereof, and belongs to the technical field of heavy metal contaminated soil remediation, the heavy metal contaminated soil leaching remediation system comprises contaminated soil, a surface sealing film is arranged at the top of the contaminated soil, and multiple sets of embedded holes are formed in the surface sealing film and the contaminated soil in a linear array mode. According to the device, a rolling wheel drives a connecting rod and a rack to move, a first gear drives a connecting block, a first round wheel, a rectangular block and a protective layer to move, a first through hole formed in a second round wheel is shielded through the protective layer, so that the output hole diameter of a spray head is automatically adjusted, and the distance between a vertical plate from top to bottom and the rolling wheel is larger and larger; therefore, the resistance of the nozzles at the bottom is used for counteracting hydrostatic pressure increased due to increase of the depth, it is ensured that the flow of leacheate flowing out of the multiple nozzles on the whole pipe length is close to be uniform as far as possible, the soil in the whole target remediation area can obtain the relatively balanced chemical leaching effect, and the covering effect on the soil and the leaching uniformity are remarkably improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of heavy metal contaminated soil remediation, and in particular relates to a heavy metal contaminated soil leaching and remediation system and a method for using the same. Background Art

[0002] With the development of society and industry, the soil environment is suffering from serious pollution, including heavy metal pollution, organic pollution and other pollution. The current heavy metal contaminated soil remediation technologies mainly include solidification / stabilization, chemical washing, phytoremediation and electroremediation. The heavy metal contaminated soil leaching remediation is a technology that selectively dissolves or separates heavy metal pollutants in the soil through chemical solutions, and then purifies the contaminated soil through liquid-solid separation. It is also one of the effective methods for large-scale heavy metal contaminated soil.

[0003] For example, a soil pollution remediation device disclosed in Chinese patent document (CN110961447A) includes a power supply, a refrigerator, a liquid injection pump, a vacuum pump, a steam-water separator and a freeze-thaw elution unit. The freeze-thaw elution unit includes two liquid injection drain plates, two liquid extraction drain plates and a freezing pipe. The two liquid extraction drain plates are arranged outside the freezing pipe, and the two liquid injection drain plates are symmetrically arranged outside the liquid extraction drain plates. The refrigerator is connected to the freezing pipe, the liquid injection pump is connected to the liquid injection drain plate, the liquid extraction drain plate is connected to the steam-water separator, and the steam-water separator is connected to the vacuum pump. The two liquid injection drain plates are used as the cooling medium. As the anode, the two liquid extraction drain plates serve as cathodes. The injection drain plate and the liquid extraction drain plate on the same side of the freezing pipe are connected to the positive and negative poles of the power supply through wires, and an electrode area is formed between the injection drain plate and the liquid extraction drain plate. The invention adopts a combination of electric repair, artificial freezing and vertical shaft elution to improve the repair effect. However, during the use of the device, the pressure between multiple nozzles or water outlets on the same liquid injection drain plate is different, resulting in different soil liquid flow and penetration effects at different depths, which in turn affects the repair effect of the device. Therefore, improvement is needed. Summary of the Invention

[0004] The purpose of the present invention is to solve the problem in the prior art that during use, the pressures between multiple nozzles or water outlets on the same liquid injection drainage plate are different, resulting in different soil liquid flow rates and penetration effects at different depths, which in turn affects the remediation effect of the device. A heavy metal contaminated soil leaching and remediation system and its use method are proposed.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A heavy metal contaminated soil leaching and remediation system includes contaminated soil, a surface sealing membrane is provided on the top of the contaminated soil, a plurality of pre-buried holes are linearly arrayed within the surface sealing membrane and the contaminated soil, a plurality of anode hollow tubes and cathode plastic drainage cylinders are alternately arrayed within the plurality of pre-buried holes, an anti-precipitation component is provided within the cathode plastic drainage cylinder, a plurality of nozzles are circumferentially arrayed within the anode hollow tube, and a plurality of pressure adaptation components and dispersion components are respectively provided within the nozzles;

[0007] The pressure adaptation component includes a first gear rotatably connected to one side of the outside of the nozzle, an adaptive adjustment unit is provided on the outer peripheral side of the first gear, first circular wheels are fixedly connected to both sides of the interior of the first gear through connecting blocks, a second circular wheel is sealed on one side of the first circular wheel, first through holes are opened on both sides of the interior of the second circular wheel, and protective layers are provided on both sides of the interior of the first through hole, and the first gear and the first circular wheel are driven to rotate by the adaptive adjustment unit to adjust the output aperture of the nozzle.

[0008] As a further description of the above technical solution:

[0009] The first circular wheel is rotatably sealed inside the nozzle, the second circular wheel is fixedly connected to a channel opened inside the nozzle, one side of the protective layer is fixedly connected to the outer wall of the connecting block through a rectangular block, an arc-shaped through hole is opened inside the nozzle, and the connecting block is slidably connected inside the arc-shaped through hole.

[0010] As a further description of the above technical solution:

[0011] A rack is meshedly connected to one side of the top of the first gear, and a connecting rod is fixedly connected to one side of the rack. A fixing plate is provided on the outer peripheral side of the connecting rod, and the fixing plate is fixedly connected to the inside of the anode hollow tube. A circular through hole is opened inside the fixing plate, and the connecting rod is slidably connected inside the circular through hole.

[0012] As a further description of the above technical solution:

[0013] The connecting rod is fixedly connected to the roller at one end away from the rack, and a vertical plate is provided on the other side of the roller. A plurality of cone blocks are fixedly connected to the side of the vertical plate opposite to the roller. The cone blocks are arranged above the roller, and the plurality of cone blocks are increasingly farther away from the roller from top to bottom. A second spring is sleeved on the outer peripheral side of the connecting rod, and the two sides of the second spring are respectively fixedly connected to one side of the roller and one side of the fixed plate.

[0014] As a further description of the above technical solution:

[0015] An annular cylinder is provided above the vertical plate, the top of the annular cylinder is fixedly connected to the inner wall of the anode hollow tube, a plurality of first springs are fixedly connected to the bottom side of the annular cylinder, a sliding plate is fixedly connected to the top of the first spring, the sliding plate is slidably connected to the inside of the annular cylinder, the bottom of the sliding plate is fixedly connected to the top of the vertical plate, and the vertical plate is slidably connected to the inside of the annular cylinder.

[0016] As a further description of the above technical solution:

[0017] The two sides of the top of the sliding plate are fixedly connected to the main liquid sacs, and the two main liquid sacs are connected to the same connecting pipe through a pipe joint. The other end of the connecting pipe is provided with multiple connection boxes through the pipe joint and the branch pipe. The connection box is arranged below the nozzle and fixedly connected to the inside of the anode hollow tube. The tops of the multiple extraction main pipes are connected to the same injection main pipe through pipes.

[0018] As a further description of the above technical solution:

[0019] An auxiliary liquid sac is fixedly connected to the inner circumference of the connection box, and the auxiliary liquid sac is connected to the branch pipe. A sliding block is fixedly connected to the side of the auxiliary liquid sac away from the inner wall of the connection box, and a guide rod is fixedly connected to the other side of the sliding block. The sliding block and the guide rod are both slidably sealed inside the connection box. A third spring is provided on both sides of the auxiliary liquid sac, and both sides of the third spring are fixedly connected to one side of the sliding block and the inner wall of the connection box respectively.

[0020] As a further description of the above technical solution:

[0021] The dispersion component includes a round seat arranged at the center of the output end of the nozzle, the round seat is fixedly connected to the inner wall of the nozzle through a mounting frame, a plurality of fourth springs are fixedly connected to one side of the inside of the round seat, and a main oil bag is provided on the inner circumference of the plurality of fourth springs, one side of the main oil bag is fixedly connected to the inner wall of the round seat, the fourth spring and the other side of the main oil bag are fixedly connected to a circular plate, the circular plate is slidably connected to the inside of the round seat, and the side of the circular plate away from the main oil bag is fixedly connected to a fixing rod, the fixing rod and the circular plate are both slidably sealed inside the round seat, the fixing rod extends to the outside of the round seat away from one end of the circular plate and is fixedly connected to a conical cylinder, the output end of the nozzle is provided with a cone that is adapted to the outer circumference of the conical cylinder, the main oil bag is connected to two auxiliary oil bags through an oil delivery pipe and a pipe joint, the auxiliary oil bag is arranged inside the nozzle, and the two sides of the auxiliary oil bag are respectively fixedly connected to the inner wall of the nozzle and one side of the connecting block.

[0022] As a further description of the above technical solution:

[0023] The anti-sedimentation component includes a pumping cylinder, which is rotatably connected to the inside of the cathode plastic drainage cylinder. The bottom of the pumping cylinder is connected to a pumping head. The outer peripheral side of the top of the pumping cylinder is fixedly connected to a second gear. A partition is provided below the second gear. The partition is fixedly connected to the pumping cylinder and the inside of the cathode plastic drainage cylinder. A third gear is meshed with one side of the second gear. A rotating shaft is fixedly connected to the inside of the third gear. The top of the rotating shaft is fixedly connected to a drive motor. The top of the drive motor is fixedly connected to the inner wall of the cathode plastic drainage cylinder. Multiple cathode plastic drainage cylinders are connected to the same extraction main pipe through a pipe.

[0024] A method for leaching and remediating heavy metal contaminated soil, comprising the following steps:

[0025] S1. First, insert the anode hollow tube and cathode plastic drainage tube into the pre-buried holes in the contaminated soil, connect the injection pipe to the external liquid supply device, and then connect the extraction pipe to the external vacuum device;

[0026] S2. Then, the anode hollow tube and the cathode plastic drain cylinder are connected to the positive electrode and the negative electrode of the external power supply respectively, and the external power supply energizes the anode hollow tube and the cathode plastic drain cylinder through the positive electrode and the negative electrode;

[0027] S3: The contaminated soil squeezes the guide rod, causing it to move the sliding block and squeeze the auxiliary liquid sac and the third spring, transferring the liquid inside the auxiliary liquid sac to the main liquid sac through the branch pipe and the connecting pipe, causing the main liquid sac to expand and drive the sliding plate, vertical plate and cone block to move downward;

[0028] S4. As the cone block moves downward, it squeezes the roller, connecting rod, second spring, and rack, causing the first gear to drive the connecting block, first circular wheel, rectangular block, and protective layer to move. The protective layer blocks the first through hole inside the second circular wheel, thereby automatically adjusting the output aperture of the nozzle.

[0029] S5. As the connecting block moves, it transfers the oil from the auxiliary oil sac to the main oil sac through the oil pipe, causing the main oil sac to expand and drive the circular plate, fixed rod, and tapered cylinder to move. This allows the tapered cylinder to align with the cone at the output end of the nozzle, reducing the annular flow cross-sectional area at the nozzle outlet.

[0030] S6. The spray liquid and dissolved pollutants that migrate into the cathode plastic drainage tube will enter the interior and will be extracted by an external vacuum pump to repair the contaminated soil;

[0031] S7. During this process, the driving motor drives the rotating shaft, the third gear, the second gear, the pumping cylinder and the pumping head to rotate, thereby reducing the precipitation effect of the liquid and heavy metal ions inside the cathode plastic drainage cylinder.

[0032] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0033] 1. In the present invention, a pressure-adaptive component is provided to enable the roller to drive the connecting rod and the rack to move, so that the first gear drives the connecting block, the first circular wheel, the rectangular block and the protective layer to move, and the first through hole opened inside the second circular wheel is blocked by the protective layer to automatically adjust the output aperture of the nozzle. As the vertical plate is increasingly distant from the roller from top to bottom, the nozzle resistance at the bottom offsets the hydrostatic pressure increased by the increase in depth, ensuring that the flow rate of the eluent flowing out of the multiple nozzles along the entire pipe length is as close to uniform as possible, so that the soil in the entire target remediation area can obtain a relatively balanced chemical elution effect, significantly improving the coverage effect and elution uniformity of the soil, and assisting in ensuring the uniformity of soil electrical conductivity and moisture distribution, making the electric field distribution more stable, and promoting the more uniform and efficient migration of heavy metal ions to the cathode in the entire remediation area, thereby effectively improving the overall pollutant removal efficiency of the soil.

[0034] 2. In the present invention, through the provision of a dispersion component, the connecting block transfers the oil in the auxiliary oil sac to the main oil sac during movement, causing the main oil sac to expand and drive the circular plate, fixed rod, and tapered tube to move. The tapered tube is matched with the cone at the output end of the nozzle, reducing the annular flow cross-sectional area at the nozzle outlet, suppressing over-elution, and assisting in enhancing the uniform penetration of contaminated soil, so as to quickly establish a saturated conductive path in the bottom soil, increase the electric field coverage depth, and enable the device to more flexibly respond to remediation needs of different soil depths, permeabilities, or pollutant concentrations.

[0035] 3. In the present invention, through the anti-precipitation component set up, the spray liquid and dissolved pollutants that migrate to the inside of the cathode plastic drainage tube will enter the interior, and the external vacuum pump will extract them. At the same time, the driving motor drives the rotating shaft, the third gear, the second gear, the pumping tube and the pumping head to rotate, reducing the precipitation effect of the liquid and heavy metal ions inside the cathode plastic drainage tube, and ensuring the internal extraction effect and anti-blocking effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a schematic diagram of the overall three-dimensional structure of the present invention;

[0037] Figure 2 This is a schematic diagram of the overall three-dimensional structure of the anode hollow tube and the cathode plastic drainage cylinder in the present invention;

[0038] Figure 3 For the present invention Figure 2 A local enlarged structural diagram of point A;

[0039] Figure 4 A schematic diagram of a partial three-dimensional structure of the pressure adaptation component of the present invention;

[0040] Figure 5 Schematic diagram of the internal three-dimensional structure of the annular cylinder in the present invention;

[0041] Figure 6 Schematic diagram of the overall three-dimensional structure of the first gear in the present invention;

[0042] Figure 7 For the present invention Figure 6 A schematic diagram of the partially enlarged structure at point B;

[0043] Figure 8 It is a schematic diagram of a partial three-dimensional structure of the dispersed components in the present invention;

[0044] Figure 9 Schematic diagram of the internal three-dimensional structure of the connection box in the present invention;

[0045] Figure 10 This is a schematic diagram of the internal three-dimensional structure of the cathode plastic drainage cylinder of the present invention;

[0046] Figure 11 For the present invention Figure 10 Schematic diagram of the local enlarged structure at point C.

[0047] Legend:

[0048] 1. Contaminated soil; 2. Surface sealing membrane; 3. Injection pipe; 4. Anode hollow tube; 5. Extraction pipe; 6. Cathode plastic drainage cylinder; 7. Pressure adaptation assembly; 701. Annular cylinder; 702. First spring; 703. Main liquid sac; 704. Sliding plate; 705. Vertical plate; 706. Cone block; 707. Roller; 708. Connecting rod; 709. Fixed plate; 710. Second spring; 711. Rack; 712. First gear; 713. Connecting block; 714. First round wheel; 715. Second round wheel; 716, protective layer; 717, connecting box; 718, third spring; 719, auxiliary liquid sac; 720, sliding block; 721, guide rod; 8, dispersion component; 801, round seat; 802, fourth spring; 803, main oil sac; 804, fixing rod; 805, conical cylinder; 806, auxiliary oil sac; 9, anti-sedimentation component; 901, pumping cylinder; 902, pumping head; 903, second gear; 904, third gear; 905, rotating shaft; 906, driving motor; 10, nozzle. DETAILED DESCRIPTION

[0049] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0050] See also Figures 1-11 The present invention provides a technical solution: a heavy metal contaminated soil leaching and remediation system, comprising contaminated soil 1, a surface sealing membrane 2 provided on the top of the contaminated soil 1, a plurality of pre-buried holes linearly arrayed inside the surface sealing membrane 2 and the contaminated soil 1, a plurality of anode hollow tubes 4 and cathode plastic drainage cylinders 6 alternately arrayed inside the plurality of pre-buried holes, an anti-precipitation component 9 provided inside the cathode plastic drainage cylinder 6, a plurality of nozzles 10 circumferentially arrayed inside the anode hollow tube 4, a plurality of pressure adaptation components 7 and dispersion components 8 provided inside the nozzles 10;

[0051] The pressure adaptation component 7 includes a first gear 712 rotatably connected to one side of the outside of the nozzle 10, an adaptive adjustment unit is provided on the outer peripheral side of the first gear 712, and the first round wheel 714 is fixedly connected to both sides of the interior of the first gear 712 through a connecting block 713, and a second round wheel 715 is sealed on one side of the first round wheel 714, and a first through hole is opened on both sides of the interior of the second round wheel 715, and a protective layer 716 is provided on both sides of the interior of the first through hole. The first gear 712 and the first round wheel 714 are driven to rotate by the adaptive adjustment unit to adjust the output aperture of the nozzle 10, the first round wheel 714 is rotatably sealed inside the nozzle 10, the second round wheel 715 is fixedly connected to the channel opened inside the nozzle 10, and one side of the protective layer 716 is sealed by a torque. The block is fixedly connected to the outer wall of the connecting block 713, an arc-shaped through hole is provided inside the nozzle 10, and the connecting block 713 is slidably connected inside the arc-shaped through hole. A rack 711 is meshed and connected to one side of the top of the first gear 712, and a connecting rod 708 is fixedly connected to one side of the rack 711. A fixing plate 709 is provided on the outer peripheral side of the connecting rod 708. The fixing plate 709 is fixedly connected to the inside of the anode hollow tube 4, and a circular through hole is provided inside the fixing plate 709. The connecting rod 708 is slidably connected to the inside of the circular through hole. The connecting rod 708 is fixedly connected to the roller 707 at one end away from the rack 711, and a vertical plate 705 is provided on the other side of the roller 707. A plurality of cone blocks 706 are fixedly connected to the side of the vertical plate 705 relative to the roller 707, and the cone blocks 706 are provided on the roller 707. Above, multiple cone blocks 706 are increasingly farther away from the roller 707 from top to bottom, a second spring 710 is sleeved on the outer peripheral side of the connecting rod 708, and both sides of the second spring 710 are fixedly connected to one side of the roller 707 and one side of the fixed plate 709 respectively. An annular cylinder 701 is provided above the vertical plate 705, and the top of the annular cylinder 701 is fixedly connected to the inner wall of the anode hollow tube 4, and multiple first springs 702 are fixedly connected to the bottom side of the annular cylinder 701. The top of the first spring 702 is fixedly connected to a sliding plate 704, and the sliding plate 704 is slidably connected to the inside of the annular cylinder 701. The bottom of the sliding plate 704 is fixedly connected to the top of the vertical plate 705, and the vertical plate 705 is slidably connected to the inside of the annular cylinder 701, and both sides of the top of the sliding plate 704 are fixedly connected to the main liquid capsule 7 03, the two main liquid capsules 703 are connected to the same connecting pipe through a pipe joint, and multiple connecting boxes 717 are set at the other end of the connecting pipe through a pipe joint and a branch pipe. The connecting box 717 is set below the nozzle 10, and the connecting box 717 is fixedly connected to the inside of the anode hollow tube 4. The tops of multiple extraction main pipes 5 are connected to the same injection main pipe 3 through pipes. The inner circumference of the connecting box 717 is fixedly connected to an auxiliary liquid capsule 719, and the auxiliary liquid capsule 719 is connected to the branch pipe. The auxiliary liquid capsule 719 is fixedly connected to a sliding block 720 on the side away from the inner wall of the connecting box 717, and the other side of the sliding block 720 is fixedly connected to a guide rod 721. The sliding block 720 and the guide rod 721 are both slidably sealed inside the connecting box 717. A third spring 718 is provided on both sides of the auxiliary liquid capsule 719.The two sides of the third spring 718 are fixedly connected to one side of the sliding block 720 and the inner wall of the connection box 717 respectively.

[0052] Specific implementation method: first, insert the anode hollow tube 4 and the cathode plastic drainage tube 6 into the pre-buried hole pre-opened in the contaminated soil 1, and connect the injection main tube 3 with the external liquid supply device, and then connect the extraction main tube 5 with the external vacuum device, and then connect the anode hollow tube 4 and the cathode plastic drainage tube 6 to the positive and negative poles of the external power supply respectively. The external power supply energizes the anode hollow tube 4 and the cathode plastic drainage tube 6 through the positive and negative poles. When the anode hollow tube 4 and the cathode plastic drainage tube 6 are inserted into the contaminated soil 1, the contaminated soil will squeeze the guide rod 721 when they just enter the contaminated soil. The guide rod 721 drives the sliding block 720 to move and squeeze the auxiliary liquid capsule 719 and the third spring 718, and transports the liquid in the auxiliary liquid capsule 719 to the main liquid capsule 703 through the branch pipe and the connecting pipe, so that the main liquid capsule 703 expands and drives the sliding plate 704, the vertical plate 705 and the cone block 706 to move downward. In the process of moving downward, the cone block 706 squeezes the roller 707, the connecting rod 708, the second spring 710 and the rack 711. The linkage effect between the rack 711 and the first gear 712 is used to transmit power to the first gear 712, so that the first gear 712 drives the connecting block 713 , the first round wheel 714, the rectangular block and the protective layer 716 are moved, and the first through hole opened in the second round wheel 715 is blocked by the protective layer 716 to automatically adjust the output aperture of the nozzle 10, and the distance between the vertical plate 705 and the roller 707 from top to bottom becomes larger and larger, so the output aperture of the bottom nozzle 10 is adjusted first, so that the multiple nozzles 10 become smaller and smaller from top to bottom, and the increased resistance of the bottom nozzle 10 is used to offset the hydrostatic pressure increased by the increase in depth, so as to ensure that the flow rate of the eluent flowing out of the multiple nozzles 10 on the entire pipe length is as close to uniform as possible, so that the soil in the entire target remediation area is uniform. It can obtain a relatively balanced chemical leaching effect, significantly improve the soil coverage effect and leaching uniformity, and assist in ensuring the uniformity of soil conductivity and moisture distribution, making the electric field distribution more stable, reducing local overheating or drying, and promoting dissolved pollutants (heavy metal ions / complexes) in the entire remediation area to migrate more evenly and efficiently toward the cathode plastic drainage tube 6, thereby effectively improving the overall pollutant removal efficiency of the soil, wherein the number of circles of the connecting box 717 can be set according to actual needs, wherein the composition shape between the anode hollow tube 4 and the cathode plastic drainage tube 6 can be selected according to actual needs.

[0053] The dispersion assembly 8 includes a round seat 801 arranged at the center of the output end of the nozzle 10. The round seat 801 is fixedly connected to the inner wall of the nozzle 10 through a mounting bracket. A plurality of fourth springs 802 are fixedly connected to one side of the inner portion of the round seat 801. A main oil bag 803 is provided on the inner circumference of the plurality of fourth springs 802. One side of the main oil bag 803 is fixedly connected to the inner wall of the round seat 801. A circular plate is fixedly connected to the other side of the fourth spring 802 and the main oil bag 803. The circular plate is slidably connected to the inside of the round seat 801. The circular plate is fixed away from the side of the main oil bag 803. It is connected to a fixed rod 804, and the fixed rod 804 and the circular plate are both slidably sealed inside the round seat 801. The fixed rod 804 extends away from one end of the circular plate to the outside of the round seat 801 and is fixedly connected to a conical cylinder 805. The output end of the nozzle 10 is provided with a cone that is adapted to the outer peripheral side of the conical cylinder 805. The main oil bag 803 is connected to two auxiliary oil bags 806 through an oil pipe and a pipe joint. The auxiliary oil bag 806 is arranged inside the nozzle 10, and the two sides of the auxiliary oil bag 806 are respectively fixedly connected to the inner wall of the nozzle 10 and one side of the connecting block 713.

[0054] Specific implementation method: During the movement, the connecting block 713 will squeeze the auxiliary oil bag 806, and transport the oil inside the auxiliary oil bag 806 to the main oil bag 803 through the oil pipe, so that the main oil bag 803 will expand and drive the circular plate, fixed rod 804 and conical cylinder 805 to move, so that the conical cylinder 805 matches the cone at the output end of the nozzle 10, reducing the annular flow cross-sectional area at the outlet of the nozzle 10, suppressing over-elution, and assisting in enhancing the uniform penetration of contaminated soil, so as to quickly establish a saturated conductive path for the bottom soil, increase the electric field coverage depth, and enable the device to more flexibly respond to the remediation needs of different soil depths, permeability or pollutant concentrations.

[0055] The anti-sedimentation component 9 includes a pumping cylinder 901, which is rotatably connected to the inside of the cathode plastic drainage cylinder 6. The bottom of the pumping cylinder 901 is connected to a pumping head 902. The outer peripheral side of the top of the pumping cylinder 901 is fixedly connected to a second gear 903. A partition is provided below the second gear 903. The partition is fixedly connected to the pumping cylinder 901 and the inside of the cathode plastic drainage cylinder 6. The second gear 903 is meshed with a third gear 904 on one side. The inside of the third gear 904 is fixedly connected to a rotating shaft 905. The top of the rotating shaft 905 is fixedly connected to a driving motor 906. The top of the driving motor 906 is fixedly connected to the inner wall of the cathode plastic drainage cylinder 6. Multiple cathode plastic drainage cylinders 6 are connected to the same extraction main pipe 5 through a pipeline.

[0056] Specific implementation method: The spray liquid and dissolved pollutants that migrate to the inside of the cathode plastic drainage tube 6 will enter the inside, and the external vacuum pump will extract them to repair the contaminated soil. During this process, the drive motor 906 can be started, and the drive motor 906 drives the rotating shaft 905 and the third gear 904 to rotate. The linkage effect between the third gear 904 and the second gear 903 is used to transmit power to the second gear 903, so that the second gear 903 drives the pumping cylinder 901 and the pumping head 902 to rotate, reducing the precipitation effect of the liquid and heavy metal ions inside the cathode plastic drainage tube 6, and ensuring the internal extraction effect and anti-blocking effect.

[0057] A method for leaching and remediating heavy metal contaminated soil, comprising the following steps:

[0058] S1. First, insert the anode hollow tube 4 and the cathode plastic drainage tube 6 into the pre-buried hole in the contaminated soil 1, connect the injection pipe 3 to the external liquid supply device, and then connect the extraction pipe 5 to the external vacuum device;

[0059] S2. After that, the anode hollow tube 4 and the cathode plastic drainage cylinder 6 are connected to the positive electrode and the negative electrode of the external power supply respectively, and the external power supply energizes the anode hollow tube 4 and the cathode plastic drainage cylinder 6 through the positive electrode and the negative electrode;

[0060] S3: The contaminated soil squeezes the guide rod 721, causing it to move the sliding block 720 and squeeze the auxiliary liquid capsule 719 and the third spring 718. The liquid in the auxiliary liquid capsule 719 is transported to the main liquid capsule 703 through the branch pipe and the connecting pipe, causing the main liquid capsule 703 to expand and drive the sliding plate 704, the vertical plate 705 and the cone block 706 to move downward.

[0061] S4. As the cone block 706 moves downward, it squeezes the roller 707, the connecting rod 708, the second spring 710, and the rack 711, causing the first gear 712 to drive the connecting block 713, the first circular wheel 714, the rectangular block, and the protective layer 716 to move. The protective layer 716 blocks the first through hole in the second circular wheel 715, thereby automatically adjusting the output aperture of the nozzle 10.

[0062] S5. During its movement, the connecting block 713 transfers the oil in the auxiliary oil sac 806 to the main oil sac 803 through the oil pipe, causing the main oil sac 803 to expand and drive the circular plate, fixed rod 804, and tapered tube 805 to move. This causes the tapered tube 805 to match the taper of the output end of the nozzle 10, thereby reducing the annular flow cross-sectional area at the outlet of the nozzle 10.

[0063] S6. The spray liquid and dissolved pollutants that migrate to the cathode plastic drainage tube 6 will enter the interior thereof, and the external vacuum pump will extract them to repair the contaminated soil;

[0064] S7. During this process, the driving motor 906 drives the rotating shaft 905, the third gear 904, the second gear 903, the pumping cylinder 901 and the pumping head 902 to rotate, thereby reducing the precipitation effect of the liquid and heavy metal ions inside the cathode plastic drainage cylinder 6.

[0065] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A heavy metal contaminated soil leaching and remediation system, comprising contaminated soil (1), characterized in that: A surface sealing film (2) is provided on the top of the contaminated soil (1); a plurality of pre-buried holes are arranged in a linear array inside the surface sealing film (2) and the contaminated soil (1); a plurality of anode hollow tubes (4) and cathode plastic drainage cylinders (6) are arranged in an alternating manner inside the plurality of pre-buried holes; an anti-precipitation component (9) is provided inside the cathode plastic drainage cylinder (6); a plurality of nozzles (10) are arranged in a circumferential array inside the anode hollow tube (4); a plurality of pressure adaptation components (7) and dispersion components (8) are respectively provided inside the nozzles (10); The pressure adaptation component (7) includes a first gear (712) rotatably connected to one side of the outside of the nozzle (10), an adaptive adjustment unit is provided on the outer peripheral side of the first gear (712), first round wheels (714) are fixedly connected to both sides of the interior of the first gear (712) through connecting blocks (713), a second round wheel (715) is sealed on one side of the first round wheel (714), first through holes are opened on both sides of the interior of the second round wheel (715), and protective layers (716) are provided on both sides of the interior of the first through hole, and the first gear (712) and the first round wheel (714) are driven to rotate by the adaptive adjustment unit to adjust the output aperture of the nozzle (10).

2. A heavy metal contaminated soil leaching and remediation system according to claim 1, characterized in that: The first circular wheel (714) is rotatably sealed inside the nozzle (10), the second circular wheel (715) is fixedly connected to a channel opened inside the nozzle (10), one side of the protective layer (716) is fixedly connected to the outer wall of the connecting block (713) through a rectangular block, an arc-shaped through hole is opened inside the nozzle (10), and the connecting block (713) is slidably connected inside the arc-shaped through hole.

3. The heavy metal contaminated soil leaching and remediation system according to claim 2, characterized in that: A rack (711) is meshedly connected to one side of the top of the first gear (712), and a connecting rod (708) is fixedly connected to one side of the rack (711). A fixing plate (709) is provided on the outer peripheral side of the connecting rod (708). The fixing plate (709) is fixedly connected to the inside of the anode hollow tube (4), and a circular through hole is provided inside the fixing plate (709). The connecting rod (708) is slidably connected inside the circular through hole.

4. The heavy metal contaminated soil leaching and remediation system according to claim 3, characterized in that: The connecting rod (708) is fixedly connected to a roller (707) at one end away from the rack (711), and a vertical plate (705) is provided on the other side of the roller (707). The vertical plate (705) is fixedly connected to a plurality of cone blocks (706) on the side opposite to the roller (707). The cone blocks (706) are provided above the roller (707), and the plurality of cone blocks (706) are increasingly farther away from the roller (707) from top to bottom. A second spring (710) is sleeved on the outer peripheral side of the connecting rod (708), and the two sides of the second spring (710) are fixedly connected to one side of the roller (707) and one side of the fixed plate (709) respectively.

5. The heavy metal contaminated soil leaching and remediation system according to claim 4, characterized in that: An annular cylinder (701) is provided above the vertical plate (705), the top of the annular cylinder (701) is fixedly connected to the inner wall of the anode hollow tube (4), a plurality of first springs (702) are fixedly connected to the bottom side of the annular cylinder (701), a sliding plate (704) is fixedly connected to the top of the first spring (702), the sliding plate (704) is slidably connected to the inside of the annular cylinder (701), the bottom of the sliding plate (704) is fixedly connected to the top of the vertical plate (705), and the vertical plate (705) is slidably connected to the inside of the annular cylinder (701).

6. The heavy metal contaminated soil leaching and remediation system according to claim 5, characterized in that: Both sides of the top of the sliding plate (704) are fixedly connected to main liquid sacs (703), and the two main liquid sacs (703) are connected to the same connecting pipe through a pipe joint. The other end of the connecting pipe is provided with multiple connection boxes (717) through the pipe joint and the branch pipe. The connection box (717) is arranged below the nozzle (10), and the connection box (717) is fixedly connected to the inside of the anode hollow tube (4). The tops of the multiple extraction main pipes (5) are connected to the same injection main pipe (3) through pipes.

7. The heavy metal contaminated soil leaching and remediation system according to claim 6, characterized in that: The inner circumference of the connection box (717) is fixedly connected to an auxiliary liquid sac (719), and the auxiliary liquid sac (719) is connected to the branch pipe. The side of the auxiliary liquid sac (719) away from the inner wall of the connection box (717) is fixedly connected to a sliding block (720), and the other side of the sliding block (720) is fixedly connected to a guide rod (721). The sliding block (720) and the guide rod (721) are both slidably sealed inside the connection box (717). A third spring (718) is provided on both sides of the auxiliary liquid sac (719), and the two sides of the third spring (718) are respectively fixedly connected to one side of the sliding block (720) and the inner wall of the connection box (717).

8. The heavy metal contaminated soil leaching and remediation system according to claim 7, characterized in that: The dispersion assembly (8) includes a round seat (801) arranged at the center of the output end of the nozzle (10), the round seat (801) is fixedly connected to the inner wall of the nozzle (10) through a mounting frame, a plurality of fourth springs (802) are fixedly connected to one side of the inner portion of the round seat (801), a main oil bag (803) is provided on the inner circumference of the plurality of fourth springs (802), one side of the main oil bag (803) is fixedly connected to the inner wall of the round seat (801), and a circular plate is fixedly connected to the other side of the fourth springs (802) and the main oil bag (803), the circular plate is slidably connected to the inner portion of the round seat (801), and the circular plate is fixed on the side away from the main oil bag (803). A fixing rod (804) is connected, and the fixing rod (804) and the circular plate are both slidably sealed inside the circular seat (801). The fixing rod (804) extends away from one end of the circular plate to the outside of the circular seat (801) and is fixedly connected to a conical cylinder (805). The output end of the nozzle (10) is provided with a cone that is adapted to the outer peripheral side of the conical cylinder (805). The main oil bag (803) is connected to two auxiliary oil bags (806) through an oil delivery pipe and a pipe joint. The auxiliary oil bags (806) are provided inside the nozzle (10), and the two sides of the auxiliary oil bag (806) are fixedly connected to the inner wall of the nozzle (10) and one side of the connecting block (713) respectively.

9. The heavy metal contaminated soil leaching and remediation system according to claim 1, characterized in that: The anti-sedimentation component (9) includes a water pumping cylinder (901), which is rotatably connected to the inside of the cathode plastic drainage cylinder (6). The bottom of the water pumping cylinder (901) is connected to a water pumping head (902). The outer peripheral side of the top of the water pumping cylinder (901) is fixedly connected to a second gear (903). A partition is provided below the second gear (903). The partition is fixedly connected to the water pumping cylinder (901) and the inside of the cathode plastic drainage cylinder (6). One side of the second gear (903) is meshed with a third gear (904). The inside of the third gear (904) is fixedly connected to a rotating shaft (905). The top of the rotating shaft (905) is fixedly connected to a driving motor (906). The top of the driving motor (906) is fixedly connected to the inner wall of the cathode plastic drainage cylinder (6). Multiple cathode plastic drainage cylinders (6) are connected to the same extraction main pipe (5) through a pipeline.

10. A method for leaching and remediation of heavy metal contaminated soil, characterized in that: A heavy metal contaminated soil leaching and remediation system as described in any one of claims 1 to 9 specifically comprises the following steps: S1. First, insert the anode hollow tube (4) and the cathode plastic drainage tube (6) into the pre-buried hole opened in the contaminated soil (1), connect the injection pipe (3) to the external liquid supply device, and then connect the extraction pipe (5) to the external vacuum device; S2. Then, the anode hollow tube (4) and the cathode plastic drainage tube (6) are connected to the positive electrode and the negative electrode of the external power supply respectively, and the external power supply energizes the anode hollow tube (4) and the cathode plastic drainage tube (6) through the positive electrode and the negative electrode; S3. The contaminated soil squeezes the guide rod (721), causing the guide rod (721) to drive the sliding block (720) to move and squeeze the auxiliary liquid bag (719) and the third spring (718), and the liquid inside the auxiliary liquid bag (719) is transported to the inside of the main liquid bag (703) through the branch pipe and the connecting pipe, causing the main liquid bag (703) to expand and drive the sliding plate (704), the vertical plate (705) and the cone block (706) to move downward; S4. When the cone block (706) moves downward, it squeezes the roller (707), the connecting rod (708), the second spring (710) and the rack (711), so that the first gear (712) drives the connecting block (713), the first circular wheel (714), the rectangular block and the protective layer (716) to move, and the first through hole opened inside the second circular wheel (715) is blocked by the protective layer (716), so as to automatically adjust the output aperture of the nozzle (10); S5. During the movement, the connecting block (713) transports the oil in the auxiliary oil bag (806) to the main oil bag (803) through the oil pipe, causing the main oil bag (803) to expand and drive the circular plate, the fixed rod (804) and the tapered cylinder (805) to move, so that the tapered cylinder (805) matches the cone at the output end of the nozzle (10), thereby reducing the annular flow cross-sectional area at the outlet of the nozzle (10); S6. The spray liquid and dissolved pollutants that migrate to the cathode plastic drainage cylinder (6) will enter the interior thereof and will be extracted by an external vacuum pump to repair the contaminated soil; S7. During this process, the driving motor (906) drives the rotating shaft (905), the third gear (904), the second gear (903), the pumping cylinder (901) and the pumping head (902) to rotate, thereby reducing the precipitation effect of the liquid and heavy metal ions inside the cathode plastic drainage cylinder (6).

Images