Electric animal and plant synergistic remediation system and method for heavy metal contaminated soil

Abstract

The invention discloses an electric animal and plant synergistic remediation system and method for heavy metal contaminated soil, and relates to the field of heavy metal contaminated soil remediation, the electric animal and plant synergistic remediation system comprises a supporting frame, two mounting shafts are rotationally connected in the supporting frame, and the outer surfaces of the mounting shafts are in transmission connection with a first driving mechanism connected with the supporting frame; according to the electric animal and plant synergistic remediation system and method for the heavy metal contaminated soil, through the synergistic effect of electric remediation, plant remediation and microorganisms, the purification effect of the heavy metal contaminated soil is remarkably improved. The electrokinetic remediation comprises the following steps: electrifying a graphite electrode through a direct-current power supply, and enriching charged heavy metal ions towards an electrode area under the action of electric field force; in phytoremediation, the hyperaccumulator root system secretes organic acids, chelating agents and the like, activates and releases heavy metals to a soil solution, improves the bioavailability of the soil solution, and promotes migration and enrichment of heavy metal ions in cooperation with electrokinetic remediation.

Description

Technical Field

[0001] This invention relates to heavy metal contaminated soil remediation technology, specifically to an electric plant-based co-remediation system and method for heavy metal contaminated soil. Background Technology

[0002] Heavy metal contamination of soil has become a global environmental challenge, seriously threatening ecological security and human health. Traditional remediation technologies, such as chemical leaching and topsoil replacement, can partially remove heavy metals, but they have drawbacks such as high costs, the risk of secondary pollution, and damage to soil structure. Against this backdrop, electrostatic remediation technology, as an emerging in-situ remediation method, is gradually gaining attention due to its advantages such as low operating costs, simple installation, and applicability to low-permeability soils.

[0003] The core principle of electrokinetic remediation technology lies in implanting inert electrodes at both ends of contaminated soil and applying a direct current electric field. The electric field induces various electrokinetic effects (including electrodialysis, electromigration, electrophoresis, and diffusion) to drive charged heavy metal ions in the soil to migrate directionally along the direction of the electric field, ultimately concentrating the heavy metals in the vicinity of the electrodes for centralized treatment. However, single electrokinetic remediation technology still faces many limitations in practical applications: for example, its removal effect on stable heavy metals in soil (such as iron-manganese oxide-bound and residual states) is limited; uneven electric field distribution may lead to remediation blind spots, resulting in poor purification of heavy metal-laden soil and hindering the restoration of soil ecological functions. Summary of the Invention

[0004] The purpose of this invention is to provide an electro-hydro-propagated plant-based remediation system and method for heavy metal contaminated soil, in order to solve the problem of poor heavy metal removal efficiency in existing technologies.

[0005] To achieve the above objectives, the present invention provides the following technical solution: an electric phytoremediation system for heavy metal contaminated soil, comprising a support frame, two mounting shafts rotatably connected within the support frame, a first drive mechanism connected to the support frame being driven to rotate on the outer surface of the mounting shafts, a purification box being fixedly connected between the two mounting shafts, a cathode box and an anode box being provided inside the purification box, filter plates being fixedly connected to both the cathode box and the anode box, graphite electrodes being provided inside both the cathode box and the anode box, the input end of the graphite electrodes being electrically connected to a DC power supply via wires, and a bidirectional pump body fixedly connected to the purification box via pipes on both the cathode box and the anode box.

[0006] A first telescopic drive component is fixedly connected inside the support frame. A planting plate is fixedly connected to the output end of the first telescopic drive component. Multiple planting holes and multiple soil placement grooves are opened on the top of the planting plate. An installation tube is rotatably connected to the purification box. A second drive mechanism connected to the purification box is driven to the outer surface of the installation tube. The second drive mechanism is used to drive the installation tube to rotate. A transmission tube is slidably connected inside the installation tube. A transmission block is fixedly connected to the outer surface of the transmission tube. A transmission groove is opened inside the transmission tube and slidably connected to the transmission block. A spiral tube is fixedly connected to the top of the transmission tube.

[0007] Furthermore, the first driving mechanism includes a second telescopic driving member fixedly connected to the support frame, and the output end of the second telescopic driving member is fixedly connected to a transmission rack slidably connected to the support frame. One side of the transmission rack is meshed with a transmission gear fixedly sleeved to the mounting shaft.

[0008] Furthermore, the second drive mechanism includes a rotating drive component fixedly connected to the purification box. The output end of the rotating drive component is fixedly connected to a first drive shaft rotatably connected to the purification box. The outer surface of the first drive shaft is driven by a plurality of second drive shafts rotatably connected to the purification box through a drive wheel and a drive belt. The outer surface of the second drive shaft is driven by a third drive shaft rotatably connected to the purification box through a drive wheel and a drive belt. The outer surfaces of the second drive shaft and the third drive shaft are all fixedly sleeved with a first gear. The outer surface of the first gear is meshed with a second gear fixedly sleeved to the mounting tube.

[0009] Furthermore, a third telescopic drive component is fixedly connected to the outer surface of the purification box, and a transmission box is fixedly connected to the output end of the third telescopic drive component. The transmission box is rotatably connected to the bottom end of the transmission tube. Multiple liquid outlet holes are opened on the outer surface of the spiral tube. A supply mechanism connected to the support frame is provided on the transmission box. The supply mechanism is used to supply nutrient solution to the transmission box.

[0010] Furthermore, the supply mechanism includes a liquid supply pump fixedly connected to the support frame, a first connecting pipe fixedly connected to the output end of the liquid supply pump, a second connecting pipe fixedly connected to one end of the first connecting pipe, a flexible hose fixedly connected to the transmission box fixedly connected to the outer surface of the second connecting pipe, and an electromagnetic valve provided on the first connecting pipe.

[0011] Furthermore, a third connecting pipe is fixedly connected to the outer surface of the second connecting pipe, a blower is fixedly connected to one end of the third connecting pipe, and an electromagnetic valve is provided on the third connecting pipe.

[0012] Furthermore, a fixing plate is fixedly connected to the bottom of the support frame, and the fixing plate has multiple fixing holes.

[0013] An electro-phytoremediation method for heavy metal contaminated soil includes the following steps:

[0014] Step 1: Pour the soil containing heavy metals into the purification box, then plant the plants in the planting holes on the planting board, and then move the planting board downwards to cover the top of the purification box.

[0015] Step 2: Deionized water is pumped into the cathode box, anode box and purification box by the bidirectional pump on the purification box. Then, the graphite electrode is energized to cause heavy metal ions in the soil to accumulate in the cathode box and anode box.

[0016] Step 3: During the enrichment and purification process, the spiral tube is driven to rotate by the second drive mechanism, and nutrient solution and air are supplied to the spiral tube at the same time to promote the purification of heavy metal soil in the purification box.

[0017] Step 4: After the soil in the purification box is purified, the first drive mechanism drives the mounting shaft and the purification box to rotate, and the purification box pours out the purified soil. Then, the soil to be purified is put back into the purification box, and the above steps are repeated to purify the heavy metal soil.

[0018] Compared with existing technologies, the electro-hydrophyto-organic co-remediation system and method for heavy metal contaminated soil provided by this invention have the following beneficial effects:

[0019] The synergistic effect of electroremediation, phytoremediation, and microbial intervention significantly enhances the purification effect of heavy metal contaminated soil. Electroremediation uses a DC power supply to energize graphite electrodes, causing charged heavy metal ions to accumulate in the electrode area under the influence of the electric field. In phytoremediation, hyperaccumulating plant roots secrete organic acids and chelating agents, activating and releasing heavy metals into the soil solution, increasing their bioavailability, and working in conjunction with electroremediation to promote the migration and accumulation of heavy metal ions. Simultaneously, plant roots provide a habitat for microorganisms, and the rhizosphere microbial community changes the valence state of heavy metals through reduction, reducing their toxicity. In addition, the spiral tube moves up and down and rotates back and forth within the purification chamber, agitating the soil and making it easier for heavy metal ions to enter the deionized water, accelerating their accumulation in the electrode area. The synergistic effect of these multiple methods efficiently removes heavy metals from the soil.

[0020] The first drive mechanism rotates the mounting shaft, enabling automatic rotation of the purification box and facilitating the automatic discharge of purified soil, reducing manual operation. The first telescopic drive component moves the planting plate up and down, facilitating plant planting and root removal, allowing for plant reuse without the need for regrowth, saving time and costs. Simultaneously, the supply mechanism, through a liquid pump and blower, provides nutrient solution and air to the soil, promoting root growth and enhancing the plant's ability to treat heavy metals. The nutrient solution and air are evenly injected into the soil through a spiral tube, improving resource utilization efficiency and ensuring a stable plant growth environment, thereby further enhancing the purification effect on heavy metal-contaminated soil. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0022] Figure 1 This is a first perspective view of the external structure of the present invention;

[0023] Figure 2 This is a second perspective view of the external structure of the present invention;

[0024] Figure 3 This is a third perspective view of the external structure of the present invention;

[0025] Figure 4 This is a perspective view of the internal structure of the present invention;

[0026] Figure 5 For the present invention Figure 2 Enlarged view of A in the middle;

[0027] Figure 6 For the present invention Figure 3 Enlarged view of B in the middle;

[0028] Figure 7 For the present invention Figure 4 A magnified view of C.

[0029] Explanation of reference numerals in the attached figures:

[0030] 1. Support frame; 2. Mounting shaft; 3. Purification box; 4. Cathode box; 5. Anode box; 6. Filter plate; 7. Graphite electrode; 8. Bidirectional pump body; 9. First telescopic drive component; 10. Planting plate; 11. Planting hole; 12. Soil placement trough; 13. Mounting pipe; 14. Transmission pipe; 15. Transmission block; 16. Transmission groove; 17. Spiral tube; 21. Second telescopic drive component; 22. Transmission rack; 23. Transmission gear; 31. Rotation drive component; 32. First transmission shaft; 33. Second transmission shaft; 34. Third transmission shaft; 35. First gear; 36. Second gear; 41. Third telescopic drive component; 42. Transmission box; 43. Liquid outlet; 51. Liquid supply pump; 52. First connecting pipe; 53. Second connecting pipe; 54. Hose; 55. Third connecting pipe; 56. Blower. Detailed Implementation

[0031] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0032] Example 1

[0033] Please see Figures 1 to 7 As shown, the present invention provides an electric plant-based co-remediation system for heavy metal contaminated soil, including a support frame 1. Two mounting shafts 2 are rotatably connected inside the support frame 1. A first drive mechanism connected to the support frame 1 is transmittedly connected to the outer surface of the mounting shafts 2. The first drive mechanism is used to drive the mounting shafts 2 to rotate. A purification box 3 is fixedly connected between the two mounting shafts 2. A cathode box 4 and an anode box 5 are provided inside the purification box 3. Filter plates 6 are fixedly connected to both the cathode box 4 and the anode box 5. Graphite electrodes 7 are provided inside both the cathode box 4 and the anode box 5. The input end of the graphite electrode 7 is electrically connected to a DC power supply through an electric wire. A bidirectional pump body 8 fixedly connected to the purification box 3 is fixedly connected to both the cathode box 4 and the anode box 5 through a pipe.

[0034] A first telescopic drive component 9 is fixedly connected inside the support frame 1. The first telescopic drive component 9 is an electric telescopic rod or an electric hydraulic rod. A planting plate 10 is fixedly connected to the output end of the first telescopic drive component 9. Multiple planting holes 11 are opened on the top of the planting plate 10. Multiple soil placement grooves 12 are opened on the top of the planting plate 10. An installation tube 13 is rotatably connected to the purification box 3. A second drive mechanism connected to the purification box 3 is driven to rotate the installation tube 13. A transmission tube 14 is slidably connected inside the installation tube 13. A transmission block 15 is fixedly connected to the outer surface of the transmission tube 14. A transmission groove 16 is opened inside the transmission tube 14 and slidably connected to the transmission block 15. A spiral tube 17 is fixedly connected to the top of the transmission tube 14.

[0035] The first drive mechanism includes a second telescopic drive member 21 fixedly connected to the support frame 1. The second telescopic drive member 21 is an electric telescopic rod or an electric hydraulic rod. The output end of the second telescopic drive member 21 is fixedly connected to a transmission rack 22 that is slidably connected to the support frame 1. One side of the transmission rack 22 is meshed with a transmission gear 23 that is fixedly sleeved with the mounting shaft 2. The second telescopic drive member 21 drives the transmission rack 22 to move, and the transmission rack 22 drives the transmission gear 23 and the mounting shaft 2 to rotate.

[0036] The second drive mechanism includes a rotating drive component 31 fixedly connected to the purification chamber 3. The rotating drive component 31 is a servo motor, which is controlled by a PLC programming program to control forward and reverse rotation and rotation angle. The output end of the rotating drive component 31 is fixedly connected to a first transmission shaft 32 rotatably connected to the purification chamber 3. The outer surface of the first transmission shaft 32 is driven by a transmission wheel and a transmission belt to a plurality of second transmission shafts 33 rotatably connected to the purification chamber 3. The outer surface of the second transmission shafts 33 is driven by a transmission wheel and a transmission belt to a third transmission shaft 34 rotatably connected to the purification chamber 3. The second transmission shafts 33 and the third transmission shafts 34 are connected by a transmission wheel and a transmission belt to a third transmission shaft 34 rotatably connected to the purification chamber 3. The outer surfaces of the three drive shafts 34 are all fixedly fitted with first gears 35. The outer surfaces of the first gears 35 are meshed with second gears 36, which are fixedly fitted with mounting tubes 13. The drive unit 31 drives the first drive shaft 32 to rotate. The first drive shaft 32 drives the second drive shaft 33 to rotate through a drive wheel and a drive belt. The second drive shaft 33 drives the third drive shaft 34 to rotate through a drive wheel and a drive belt. The second drive shaft 33 and the third drive shaft 34 drive the first gear 35 to rotate. The first gear 35 drives the second gear 36 to rotate. The second gear 36 drives the mounting tube 13 to rotate.

[0037] A third telescopic drive component 41 is fixedly connected to the outer surface of the purification box 3. The third telescopic drive component 41 is an electric telescopic rod or an electric hydraulic rod. The output end of the third telescopic drive component 41 is fixedly connected to a transmission box 42. The transmission box 42 is rotatably connected to the bottom end of the transmission pipe 14. Multiple liquid outlet holes 43 are opened on the outer surface of the spiral tube 17. A supply mechanism connected to the support frame 1 is provided on the transmission box 42. The supply mechanism is used to supply nutrient solution to the transmission box 42.

[0038] Plants are grown in the planting holes 11 on the planting plate 10 (e.g., centipede grass). The first telescopic drive 9 then moves the planting plate 10 downwards, placing the planted plants on top of the purification box 3. Heavy metal-contaminated soil is then placed into the purification box 3 through the soil inlet 12 on top of the planting plate 10. Deionized water is then added to the purification box 3. Finally, a DC power supply is activated, energizing the graphite electrodes 7 in the cathode box 4 and anode box 5. At this point, charged heavy metal ions (such as Pb) are released. 2+ Cd2+ Under the influence of an electric field, the soil migrates towards the electrode region via electrophoresis and accumulates. During this accumulation process, the second drive mechanism simultaneously drives the mounting tube 13 to rotate in both directions. The mounting tube 13 drives the transmission tube 14 to rotate via the transmission groove 16 and the transmission block 15. The transmission tube 14 drives the spiral tube 17 to rotate, and the spiral tube 17 agitates the soil in the purification box 3 in both directions. Simultaneously, the third telescopic drive member 41 drives the transmission box 42 to move up and down. The transmission box 42 drives the rotating transmission tube 14 to move up and down reciprocally. The transmission box 42 drives the transmission tube 14 and the spiral tube 17 to move up and down, thereby causing the multiple spiral tubes 17 in the purification box 3 to move up and down. 7. The soil in the purification tank 3 is agitated by the up-and-down reciprocating motion and forward-and-backward reciprocating rotation, causing heavy metal ions to enter the ionized water from the soil. This promotes the accumulation of heavy metal ions in the cathode tank 4 and anode tank 5. After a period of accumulation, the water accumulated in the cathode tank 4 and anode tank 5 is pumped in through the bidirectional pump 8, followed by the pumping of deionized water for further accumulation. After another period of accumulation, and through the electromechanical remediation process via plant roots, the remaining heavy metals in the soil are mostly in a stable state (such as iron-manganese oxide bound state or residue state), with low bioavailability. Hyperaccumulating plant roots secrete organic acids (such as citric acid and oxalic acid) and chelating agents (such as plant siderophores) to break the bonds between heavy metals and soil colloids, activating and releasing them into the soil solution, thus improving the bioavailability of heavy metals. For example, the citric acid secreted by the roots of Centipede Grass can bind with Pb... 2+ It forms soluble complexes, promoting their migration to the root surface, and at the same time, it works in conjunction with the migration and enrichment of heavy metal ions, thereby achieving effective removal of heavy metals from the soil.

[0039] Example 2

[0040] Based on Example 1, please refer to Figures 1 to 7 As shown, the supply mechanism includes a liquid supply pump 51 fixedly connected to the support frame 1. The output end of the liquid supply pump 51 is fixedly connected to a first connecting pipe 52. One end of the first connecting pipe 52 is fixedly connected to a second connecting pipe 53. The outer surface of the second connecting pipe 53 is fixedly connected to a flexible hose 54 fixedly connected to the transmission box 42. An electromagnetic valve is provided on the first connecting pipe 52.

[0041] A third connecting pipe 55 is fixedly connected to the outer surface of the second connecting pipe 53. A blower 56 is fixedly connected to one end of the third connecting pipe 55. An electromagnetic valve is installed on the third connecting pipe 55.

[0042] The bottom of the support frame 1 is fixedly connected to a fixing plate, and the fixing plate has multiple fixing holes.

[0043] Simultaneously, plant roots provide habitats for microorganisms, forming rhizosphere microbial communities. Some microorganisms (such as sulfate-reducing bacteria and iron-reducing bacteria) can alter the valence state of heavy metals through reduction, thus reducing their toxicity. For example, sulfate-reducing bacteria reduce Cr(VI) to the less toxic Cr(III), and iron-reducing bacteria reduce Fe(III) to Fe(II), promoting the precipitation or fixation of heavy metals. Meanwhile, the nutrient solution is supplied to the transmission box 42 via the first connecting pipe 52, the second connecting pipe 53, and the hose 54 through the supply pump 51. The transmission box 42 then supplies nutrient solution to the transmission pipe 14, which in turn supplies nutrient solution to the spiral tube 17. The spiral tube 17 sprays the nutrient solution out through its surface outlet holes 43. Simultaneously, the rotation and up-and-down movement of the spiral tube 17 evenly injects the nutrient solution into the soil, facilitating... The plant roots grow, and at regular intervals, the solenoid valve on the first connecting pipe 52 is closed, and then the solenoid valve on the third connecting pipe 55 is opened, which activates the blower 56. The blower 56 supplies gas to the transmission box 42 through the third connecting pipe 55, the second connecting pipe 53, and the hose 54. The gas then passes through the liquid outlet 43 on the spiral tube 17 to introduce air into the soil, thereby increasing the oxygen content in the soil and further promoting the growth of plant roots. This allows the plant roots to better process heavy metals in the soil and further improves the purification effect on soils with heavy metals.

[0044] After the soil is purified, the water accumulated in the cathode box 4 and anode box 5 is extracted. Then, the planting plate 10 is moved upward by the first telescopic drive component 9. While moving, the spiral tube 17 is rotated, which loosens the soil in the purification box 3, causing the plant roots to be pulled out of the soil. After the plant roots are pulled out of the soil, the first drive mechanism drives the mounting shaft 2 to rotate, which in turn drives the purification box 3 to rotate. The purification box 3 automatically pours in the purified soil and automatically pours it out. Then, the purification box 3 is rotated to the initial position, and the planting plate 10 is moved downward by the first telescopic drive component 9, placing the plant roots on the planting plate 10 into the purification box 3. Then, the soil to be purified containing heavy metals is poured into the purification box 3 through the soil discharge trough 12, thereby realizing the reuse of plants without the need for plant regeneration, thus improving the soil purification efficiency.

[0045] Example 3

[0046] Based on Examples 1 and 2, please refer to Figures 1 to 7 As shown, an electro-phytoremediation method for heavy metal contaminated soil includes the following steps:

[0047] Step 1: Pour the soil containing heavy metals into the purification box 3, then plant the plants in the planting holes 11 on the planting plate 10, and then move the planting plate 10 downwards to cover the top of the purification box 3.

[0048] Step 2: Deionized water is pumped into cathode box 4, anode box 5 and purification box 3 by the bidirectional pump on purification box 3. Then, the graphite electrode 7 is energized to enrich the heavy metal ions in the soil into cathode box 4 and anode box 5.

[0049] Step 3: During the enrichment and purification process, the spiral tube 17 is rotated by the second drive mechanism, and nutrient solution and air are supplied to the spiral tube 17 to promote the purification of heavy metal soil in the purification box 3.

[0050] Step 4: After the soil in the purification box 3 is purified, the first drive mechanism drives the mounting shaft 2 and the purification box 3 to rotate. The purification box 3 pours out the purified soil, and then puts the soil to be purified into the purification box 3. Then the above steps are repeated to purify the heavy metal soil.

[0051] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. An electro-hydrodynamic phytoremediation system for heavy metal contaminated soil, characterized in that, The system includes a support frame (1), which has two mounting shafts (2) rotatably connected inside. The outer surface of the mounting shafts (2) is connected to a first drive mechanism connected to the support frame (1). The first drive mechanism is used to drive the mounting shafts (2) to rotate. A purification box (3) is fixedly connected between the two mounting shafts (2). A cathode box (4) and an anode box (5) are provided inside the purification box (3). Filter plates (6) are fixedly connected to both the cathode box (4) and the anode box (5). Graphite electrodes (7) are provided inside both the cathode box (4) and the anode box (5). The input end of the graphite electrode (7) is electrically connected to a DC power supply through a wire. A bidirectional pump body (8) is fixedly connected to both the cathode box (4) and the anode box (5) through a pipe and is fixedly connected to the purification box (3). The support frame (1) is fixedly connected to a first telescopic drive member (9), and the output end of the first telescopic drive member (9) is fixedly connected to a planting plate (10). The top of the planting plate (10) is provided with multiple planting holes (11) and multiple soil placement grooves (12). The purification box (3) is rotatably connected to an installation tube (13). The outer surface of the installation tube (13) is connected to a second drive mechanism connected to the purification box (3). The second drive mechanism is used to drive the installation tube (13) to rotate. The installation tube (13) is slidably connected to a transmission tube (14). The outer surface of the transmission tube (14) is fixedly connected to a transmission block (15). The transmission tube (14) is provided with a transmission groove (16) slidably connected to the transmission block (15). The top of the transmission tube (14) is fixedly connected to a spiral tube (17).

2. The electro-hydraulic phytoremediation system for heavy metal contaminated soil according to claim 1, characterized in that, The first drive mechanism includes a second telescopic drive member (21) fixedly connected to the support frame (1). The output end of the second telescopic drive member (21) is fixedly connected to a transmission rack (22) that is slidably connected to the support frame (1). One side of the transmission rack (22) is meshed with a transmission gear (23) that is fixedly sleeved with the mounting shaft (2).

3. The electro-hydrodynamic phytoremediation system for heavy metal contaminated soil according to claim 1, characterized in that, The second drive mechanism includes a rotating drive component (31) fixedly connected to the purification box (3). The output end of the rotating drive component (31) is fixedly connected to a first drive shaft (32) rotatably connected to the purification box (3). The outer surface of the first drive shaft (32) is connected to a plurality of second drive shafts (33) rotatably connected to the purification box (3) via a drive wheel and a drive belt. The outer surface of the second drive shaft (33) is connected to a third drive shaft (34) rotatably connected to the purification box (3) via a drive wheel and a drive belt. The outer surfaces of the second drive shaft (33) and the third drive shaft (34) are both fixedly sleeved with a first gear (35). The outer surface of the first gear (35) is meshed with a second gear (36) fixedly sleeved with the mounting tube (13).

4. The electro-hydraulic phytoremediation system for heavy metal contaminated soil according to claim 1, characterized in that, The outer surface of the purification box (3) is fixedly connected to a third telescopic drive component (41), and the output end of the third telescopic drive component (41) is fixedly connected to a transmission box (42). The transmission box (42) is rotatably connected to the bottom end of the transmission tube (14). The outer surface of the spiral tube (17) is provided with multiple liquid outlet holes (43). The transmission box (42) is provided with a supply mechanism connected to the support frame (1). The supply mechanism is used to supply nutrient solution to the transmission box (42).

5. The electro-hydrodynamic phytoremediation system for heavy metal contaminated soil according to claim 4, characterized in that, The supply mechanism includes a liquid supply pump (51) fixedly connected to the support frame (1). The output end of the liquid supply pump (51) is fixedly connected to a first connecting pipe (52). One end of the first connecting pipe (52) is fixedly connected to a second connecting pipe (53). The outer surface of the second connecting pipe (53) is fixedly connected to a hose (54) fixedly connected to the transmission box (42). An electromagnetic valve is provided on the first connecting pipe (52).

6. The electro-hydraulic phytoremediation system for heavy metal contaminated soil according to claim 5, characterized in that, A third connecting pipe (55) is fixedly connected to the outer surface of the second connecting pipe (53), and a blower (56) is fixedly connected to one end of the third connecting pipe (55). An electromagnetic valve is provided on the third connecting pipe (55).

7. The electro-hydraulic phytoremediation system for heavy metal contaminated soil according to claim 1, characterized in that, The bottom of the support frame (1) is fixedly connected to a fixing plate, and the fixing plate has multiple fixing holes.

8. A method for electro-phytoremediation of heavy metal contaminated soil, characterized in that, The electro-hydrodynamic phytoremediation system for heavy metal contaminated soil as described in any one of claims 1-7 is characterized by comprising the following steps: Step 1: Pour the heavy metal soil into the purification box (3), then plant the plants in the planting holes (11) on the planting board (10), and then move the planting board (10) downwards to cover the top of the purification box (3); Step 2: Deionized water is pumped into the cathode box (4), anode box (5) and purification box (3) by the bidirectional pump on the purification box (3). Then, the graphite electrode (7) is energized to enrich the heavy metal ions in the soil into the cathode box (4) and anode box (5). Step 3: During the enrichment and purification process, the spiral tube (17) is rotated by the second drive mechanism, and nutrient solution and air are supplied to the spiral tube (17) at the same time to promote the purification of heavy metal soil in the purification box (3). Step 4: After the soil in the purification box (3) is purified, the first drive mechanism drives the installation shaft (2) and the purification box (3) to rotate. The purification box (3) pours out the purified soil, and then puts the soil to be purified into the purification box (3). Then the above steps are repeated to purify the heavy metal soil.

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