Device and method for removing soil composite organic pollutants

Abstract

The present invention provides a device and method for removing complex organic pollutants in soil, which are applied in the field of soil remediation. The device injects water into the soil to be treated and performs electrolysis. Through the fluidity and solubility of water, the organic pollutants in the soil are gathered in the water. The water is then pumped into a biological pool. The water is adsorbed in sequence by spherical Yulong fillers, activated carbon hollow columns and polypropylene hollow columns, so as to achieve the effect of in-situ remediation of organic pollutants in the soil. Compared with the prior art, the present solution does not require the transportation of the soil and will not introduce new pollution into the soil. It is also simple to operate, can greatly improve the soil remediation efficiency, and reduce the remediation cost.

Description

Technical Field

[0001] The present application relates to the field of soil remediation, and in particular to a device and method for removing complex organic pollutants from soil. Background Art

[0002] Organically contaminated soil is a common type of pollution in contaminated sites. Complex organic pollutants in soil mainly include petroleum hydrocarbons, pesticides, benzene series (BTEX), polycyclic aromatic hydrocarbons (PAHs) and chlorinated hydrocarbons. These pollutants mainly enter the soil environment during the mining and use of fossil fuels, spraying of pesticides, leakage of storage tanks, discharge of sewage and stacking of solid waste. Generally, there are many types of soil organic pollutants, which are difficult to degrade, carcinogenic, teratogenic and cause crop yield reduction, thus threatening the growth of crops and human health and safety. At the same time, pollutants will also enter the groundwater due to rainwater erosion and other reasons, causing groundwater pollution.

[0003] There are many methods for treating contaminated soil, such as redox technology, chemical dehalogenation, leaching and improver remediation technology in chemical remediation technology; heat treatment, steam extraction, solidification stabilization and soil replacement in physical remediation technology; and bioremediation technology using microorganisms or plants to treat pollutants in the soil. However, there are still many shortcomings in current remediation technology, such as chemical remediation technology will take away other nutrients in the soil, posing the risk of groundwater contamination; physical remediation technology has a large amount of engineering and high cost; microorganisms in bioremediation technology have certain requirements for the growth environment and a small scope of application.

[0004] Therefore, there is an urgent need for a device and method which has less pollution to the ecological environment, is simple to operate, and can efficiently treat soil pollution and remove complex organic pollutants in situ. Summary of the invention

[0005] The purpose of the present application is to efficiently treat soil pollution in situ and remove complex organic pollutants. Compared with the prior art, a device for removing complex organic pollutants in soil is provided, including a water tank along the direction of water flow, two variable frequency water pumps, a microbial electrolysis axe, a biological pool and two pump water axes respectively located on both sides of the microbial electrolysis axe, characterized in that pipes are connected between the two variable frequency water pumps and the biological pool, between the water tank and one of the variable frequency water pumps, and between the variable frequency water pump connected to the water tank and the microbial electrolysis axe, and an electromagnetic valve is installed on the pipe between the water tank and the variable frequency water pump, and the other variable frequency water pump is respectively connected to the two pumps. A water pump hose is connected between the water axes. The microbial electrolysis axe includes multiple liquid pressure plates and multiple electrolytic blades respectively located between two adjacent liquid pressure plates. Hydraulic support rods are installed on the upper ends of the electrolytic blades and the liquid pressure plates. The liquid pressure plate includes a stainless steel liquid pressure plate and a soil cutting blade fixedly connected to the lower end of the stainless steel liquid pressure plate. A plurality of evenly distributed water pressure holes are opened on the upper end of the stainless steel liquid pressure plate. The pipe mouth between the variable frequency water pump and the microbial electrolysis axe is connected to the microbial electrolysis axe through the water pressure holes. A plurality of evenly distributed water outlet holes are opened on the side of the stainless steel liquid pressure plate. The water pressure holes and the water outlet holes are connected to the inside of the stainless steel liquid pressure plate.

[0006] The device injects water into the soil to be treated and performs electrolysis. Through the fluidity and solubility of water, the organic pollutants in the soil are gathered in the water, and the water is then pumped out into a biological pool. The water is adsorbed in sequence by spherical Yulong fillers, activated carbon hollow columns, and polypropylene hollow columns to achieve the effect of in-situ remediation of organic pollutants in the soil. Compared with the existing technology, this solution does not require the transportation of the soil and will not introduce new pollution into the soil. It is also simple to operate, which can greatly improve the efficiency of soil remediation and reduce the cost of remediation.

[0007] Furthermore, the mouth of the water outlet facing the stainless steel liquid pressure plate is covered with nylon cloth, and the nylon cloth is fixed to the edge of the water outlet mouth through a stainless steel mesh. The nylon cloth can be used to intercept mud in the soil, making it difficult for the mud to enter the liquid pressure plate, thereby effectively ensuring the circulation of water inside and outside the liquid pressure plate. The stainless steel mesh is used to fix the nylon cloth, making it difficult for it to be displaced due to the impact of water.

[0008] Furthermore, the electrolytic blade includes a stainless steel hollow plate, a plastic support rod connected between the left and right inner walls of the stainless steel hollow plate, a hard plastic fixedly connected to the upper and lower inner walls of the stainless steel hollow plate, a plastic film carbon cloth and a plastic film titanium-based alumina connected between the two hard plastics, and a soil cutting blade is also connected to the lower end of the stainless steel hollow plate. The hard plastic connected to the upper and lower ends of the plastic film carbon cloth and the plastic film titanium-based alumina serves as an electrolytic cell.

[0009] Furthermore, a water pumping port is bored at the upper end of the water pumping axe, which is connected and communicated with a water pumping hose. The water pumping axe includes two hollow stainless steel plates and three nylon mesh layers located between the ends of the two hollow stainless steel plates close to each other. A plurality of water pumping holes are bored on the hollow stainless steel plate close to the microbial electrolysis axe. The three nylon mesh layers are fixed on the hollow stainless steel plate by stainless steel mesh. When the variable frequency water pump absorbs water in use, water in the soil enters the middle part of the water pumping axe along the plurality of water pumping holes, is filtered through multiple layers of nylon mesh layers, enters the water pumping hose along the water pumping port, and finally enters the biological pool, so that water carrying organic pollutants in the soil can be flushed out into the biological pool, and through multiple adsorption and purification, the removal of organic matter in the soil is achieved.

[0010] Furthermore, the cross-section of the hollow stainless steel plate is an acute triangle, and the top angles of the two hollow stainless steel plates face downward and are fixedly contacted with each other. The two hollow stainless steel plates and multiple nylon mesh layers form an acute isosceles triangle, making the entire water pump axe present a sharp triangle shape, which facilitates its cutting into the soil to transfer water containing organic pollutants.

[0011] Furthermore, a liquid level detection probe is installed at the upper end of the biological pool to monitor the water level in the biological pool, fully ensuring its treatment efficiency for sewage extracted from the soil. The left and right inner walls of the biological pool are fixedly connected with multiple interlaced water blocks to guide the flow direction of water, effectively ensuring that the sewage can fully contact with multiple spherical Yulong fillers, so that organic pollutants can be fully adsorbed by the spherical Yulong fillers, and the discharged water is more fully purified. Multiple spherical Yulong fillers are placed above each water block. The top water block is just below the water inlet of the biological pool, and the bottom water block is just above the water outlet of the biological pool. Polypropylene hollow columns and multiple activated carbon hollow columns are placed on the inner side of the water outlet of the biological pool.

[0012] Furthermore, the polypropylene hollow column is filled with meltblown polypropylene, and the activated carbon hollow column is filled with activated carbon particles. The meltblown polypropylene and the activated carbon particles can be replaced regularly in the polypropylene hollow column and the activated carbon hollow column, so that the biological pool can always treat sewage in a relatively efficient state.

[0013] A method for removing organic pollutants from a device for removing composite organic pollutants from soil, comprising the following steps:

[0014] S1. Along the direction of water flow, arrange the water tank, two variable frequency water pumps, microbial electrolysis axe, biological pool and two pump water axes located on both sides of the microbial electrolysis axe in sequence;

[0015] S2, pumping the water in the water tank into the microbial electrolysis axe through a variable frequency water pump, and overflowing from the surface of the liquid pressure sheet, thereby contacting the electrolysis blade and being electrolyzed by the electrolysis blade;

[0016] S3, the electrolyzed water flows out of the microbial electrolysis axe, and then carries the organic pollutants in the soil and spreads to the water pump axe;

[0017] S4. Under the action of the variable frequency water pump, the electrolyzed water in the soil is pumped into the biological pool through the water pump axe, and then passes through the spherical Yulong filler, activated carbon hollow column and polypropylene hollow column in the biological pool in turn, so that the pollutant particles in the sewage are fully absorbed;

[0018] S5. Finally, the purified water is pumped into the water tank again by the variable frequency water pump, and then pumped into the microbial electrolysis axe for circulation to remove organic pollutants in the soil.

[0019] Optionally, the activated carbon hollow column includes an outer shell, end caps threadedly connected to the two ends of the outer shell, and an inner variable tube placed inside the outer shell, the activated carbon particles are placed in the inner variable tube, a long water inlet groove is opened in the middle of the outer shell, the end face of the inner variable tube facing the long water inlet groove is a porous structure, and the inner variable tube is made of elastic material. Before the water in the biological pool is discharged, it first enters the inner variable tube along the long water inlet groove and fully contacts with the activated carbon particles, so that the residual organic pollutants in the water are adsorbed again, and then enter the outer shell along the two ends of the inner variable tube, and finally are discharged from the end caps, and then pass through the next activated carbon hollow column and repeat the above process to achieve repeated adsorption and purification of sewage.

[0020] Compared with the prior art, the advantages of this application are:

[0021] The device injects water into the soil to be treated and performs electrolysis. Through the fluidity and solubility of water, the organic pollutants in the soil are gathered in the water, and the water is then pumped out into a biological pool. The water is adsorbed in sequence by spherical Yulong fillers, activated carbon hollow columns, and polypropylene hollow columns to achieve the effect of in-situ remediation of organic pollutants in the soil. Compared with the existing technology, this solution does not require the transportation of the soil and will not introduce new pollution into the soil. It is also simple to operate, which can greatly improve the efficiency of soil remediation and reduce the cost of remediation. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is the main schematic diagram of this application;

[0023] Figure 2 A side schematic diagram of the microbial electrolysis axe of the present application;

[0024] Figure 3 A schematic top view of the microbial electrolysis axe of the present application;

[0025] Figure 4 A three-dimensional diagram of the liquid pressing sheet portion of the present application;

[0026] Figure 5A cross-sectional view of the electrolytic blade of the present application;

[0027] Figure 6 A three-dimensional schematic diagram of the water pump axe of this application;

[0028] Figure 7 This is a schematic cross-sectional view of the biological pond of this application;

[0029] Figure 8 This is a schematic diagram of a three-dimensional activated carbon hollow column in Example 2 of the present application;

[0030] Fig. 9 It is a three-dimensional schematic diagram of a partially half-sectioned activated carbon hollow column in Example 2 of the present application;

[0031] Fig.10 This is an exploded view of the activated carbon hollow column of this application.

[0032] Description of the numbers in the figure:

[0033] 1 microbial electrolysis axe, 2 frequency conversion water pump, 3 biological pool, 31 liquid level detection probe, 32 spherical Yulong filler, 33 water barrier, 34 activated carbon hollow column, 35 polypropylene hollow column, 4 pump water axe, 41 hollow stainless steel plate, 42 nylon mesh layer, 43 pump water hose, 44 water extraction hole, 11 electrolysis blade, 111 stainless steel hollow plate, 112 plastic film carbon cloth, 113 plastic support rod, 114 plastic film titanium-based alumina, 115 soil cutting blade, 116 hard plastic, 12 liquid pressure sheet, 121 water pressure hole, 122 water outlet hole, 123 stainless steel liquid pressure plate, 13 hydraulic support rod, 6 water tank; 341 outer shell, 342 end cover, 343 inner variable cylinder. DETAILED DESCRIPTION

[0034] The embodiments will be combined with the drawings in the specification to clearly and completely describe the technical solution of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making any creative work shall fall within the scope of protection of the present application.

[0035] Embodiment 1:

[0036] The present invention provides a device for removing soil composite organic pollutants. Figure 1 , including a water tank 6, two variable frequency water pumps 2, a microbial electrolysis axe 1, a biological pool 3 and two water pump axes 4 respectively located on both sides of the microbial electrolysis axe 1 along the direction of water flow, characterized in that pipes are connected between the two variable frequency water pumps 2 and the biological pool 3, between the water tank 6 and one of the variable frequency water pumps 2, and between the variable frequency water pump 2 connected to the water tank 6 and the microbial electrolysis axe 1, and an electromagnetic valve is installed on the pipe between the water tank 6 and the variable frequency water pump 2, and a water pump hose 43 is connected between the other variable frequency water pump 2 and the two water pump axes 4 respectively.

[0037] See also Figure 2-3 The microbial electrolysis axe 1 includes a plurality of liquid pressure sheets 12 and a plurality of electrolytic blades 11 respectively located between two adjacent liquid pressure sheets 12. Hydraulic support rods 13 are installed on the upper ends of the electrolytic blades 11 and the liquid pressure sheets 12. The hydraulic support rods 13 are vertically arranged for inserting the microbial electrolysis axe 1 into the soil.

[0038] See also Figure 4 The liquid pressing sheet 12 includes a stainless steel liquid pressing plate 123 and a soil cutting blade 115 fixedly connected to the lower end of the stainless steel liquid pressing plate 123. A plurality of evenly distributed water pressure holes 121 are opened at the upper end of the stainless steel liquid pressing plate 123. The pipe mouth between the variable frequency water pump 2 and the microbial electrolysis axe 1 is connected to the microbial electrolysis axe 1 through the water pressure holes 121.

[0039] A plurality of evenly distributed water outlet holes 122 are drilled on the side of the stainless steel liquid pressure plate 123. The water pressure holes 121 and the water outlet holes 122 are both connected to the interior of the stainless steel liquid pressure plate 123. The mouth of the water outlet hole 122 facing the inside of the stainless steel liquid pressure plate 123 is covered with nylon cloth. The nylon cloth is fixed to the edge of the mouth of the water outlet hole 122 through a stainless steel mesh. The nylon cloth can be used to intercept mud in the soil, making it difficult for the mud to enter the liquid pressure plate 12, thereby effectively ensuring the circulation of water inside and outside the liquid pressure plate 12. The stainless steel mesh is used to fix the nylon cloth, making it difficult for it to shift due to the impact of water.

[0040] See also Figure 5 The electrolytic blade 11 includes a stainless steel hollow plate 111, a plastic support rod 113 connected between the left and right inner walls of the stainless steel hollow plate 111, a hard plastic 116 fixedly connected to the upper and lower inner walls of the stainless steel hollow plate 111, a plastic film carbon cloth 112 and a plastic film titanium-based alumina 114 connected between the two hard plastics 116, and a soil cutting blade 115 is also connected to the lower end of the stainless steel hollow plate 111. The hard plastic 116 connected to the upper and lower ends of the plastic film carbon cloth 112 and the plastic film titanium-based alumina 114 serves as an electrolytic cell.

[0041] See also Figure 6 A water pumping port is bored at the upper end of the water pump axe 4, and the water pumping port is connected and communicated with the water pumping hose 43. The water pumping axe 4 includes two hollow stainless steel plates 41 and three nylon mesh layers 42 located between the ends of the two hollow stainless steel plates 41 close to each other. A plurality of water pumping holes 44 are bored on the hollow stainless steel plate 41 close to the microbial electrolysis axe 1, and the three nylon mesh layers 42 are fixed on the hollow stainless steel plate 41 by stainless steel mesh. When the variable frequency water pump 2 absorbs water in use, water in the soil enters the middle part of the water pump axe 4 along the plurality of water pumping holes 44, and enters the water pumping hose 43 along the water pumping port through the filtration of the multi-layer nylon mesh layers 42, and finally enters the biological pool 3, so that water with organic pollutants in the soil can be flushed out into the biological pool 3, and the organic matter in the soil can be removed through multiple adsorption purification.

[0042] The cross-section of the hollow stainless steel plate 41 is an acute triangle, and the top angles of the two hollow stainless steel plates 41 face downward and are fixedly contacted with each other. The two hollow stainless steel plates 41 and the multiple nylon mesh layers 42 form an acute isosceles triangle, making the entire water pump axe 4 present a sharp triangle shape, which is convenient for it to cut into the soil and transfer water containing organic pollutants.

[0043] See also Figure 7 A liquid level detection probe 31 is installed at the upper end of the biological pool 3 to monitor the water level in the biological pool 3, fully ensuring its treatment efficiency for sewage extracted from the soil. A plurality of interlaced water blocking blocks 33 are fixedly connected to the left and right inner walls of the biological pool 3 to guide the flow direction of water, effectively ensuring that the sewage can fully contact with the plurality of spherical Yulong fillers 32, so that the organic pollutants can be fully adsorbed by the spherical Yulong fillers 32, so that the discharged water is more fully purified. A plurality of spherical Yulong fillers 32 are placed above each water blocking block 33, the uppermost water blocking block 33 is just located directly below the water inlet of the biological pool 3, and the lowermost water blocking block 33 is just located directly above the water outlet of the biological pool 3. A polypropylene hollow column 35 and a plurality of activated carbon hollow columns 34 are placed on the inner side of the water outlet of the biological pool 3.

[0044] The polypropylene hollow column 35 is filled with meltblown polypropylene, and the activated carbon hollow column 34 is filled with activated carbon particles. The meltblown polypropylene and activated carbon particles in the polypropylene hollow column 35 and the activated carbon hollow column 34 can be replaced regularly, so that the biological pool 3 can always treat sewage in a relatively efficient state.

[0045] The polypropylene hollow column 35 and the activated carbon hollow column 34 are both columnar structures with internal mesopores and porous hollow surfaces, and melt-blown polypropylene and activated carbon particles are filled in the hollow columns respectively.

[0046] A method for removing organic pollutants from a device for removing composite organic pollutants from soil, comprising the following steps:

[0047] S1. Along the direction of water flow, a water tank 6, two variable frequency water pumps 2, a microbial electrolysis axe 1, a biological pool 3, and two water pump axes 4 located on both sides of the microbial electrolysis axe 1 are arranged in sequence;

[0048] S2, pumping the water in the water tank 6 into the microbial electrolysis axe 1 through the variable frequency water pump 2, and overflowing from the surface of the liquid pressing sheet 12, thereby contacting the electrolysis blade 11 and being electrolyzed by the electrolysis blade 11;

[0049] S3, the electrolyzed water flows out of the microbial electrolysis axe 1, and then carries the organic pollutants in the soil to diffuse to the water pump axe 4;

[0050] S4, under the action of the variable frequency water pump 2, the water after electrolysis in the soil is pumped into the biological pool 3 through the water pump axe 4, and sequentially passes through the spherical Yulong filler 32, the activated carbon hollow column 34 and the polypropylene hollow column 35 in the biological pool 3, so that the pollutant particles in the sewage are fully absorbed;

[0051] S5. Finally, the purified water is pumped into the water tank 6 again by the variable frequency water pump 2, and then pumped into the microbial electrolysis axe 1 again for circulation, so as to remove organic pollutants in the soil.

[0052] The device injects water into the soil to be treated and performs electrolysis. Through the fluidity and solubility of water, the organic pollutants in the soil are gathered in the water, and then the water is pumped out to the biological pool 3. After being adsorbed in sequence by the spherical Yulong filler 32, the activated carbon hollow column 34 and the polypropylene hollow column 35, the organic pollutants in the soil are repaired in situ. Compared with the prior art, the present solution does not require the transportation of the soil and will not introduce new pollution into the soil. At the same time, it is simple to operate, which can greatly improve the efficiency of soil repair and reduce the cost of repair.

[0053] Embodiment 2:

[0054] See also Figure 8-9 The activated carbon hollow column 34 includes an outer shell 341, end caps 342 threadedly connected to the two ends of the outer shell 341, and an inner variable tube 343 placed inside the outer shell 341. The activated carbon particles are placed in the inner variable tube 343. A water inlet groove is opened in the middle of the outer shell 341. The end surface of the inner variable tube 343 facing the water inlet groove is a porous structure, and the inner variable tube 343 is made of elastic material, such as Fig.10 Before the water in the biological pool 3 is discharged, it first enters the inner variable tube 343 along the water inlet groove and fully contacts with the activated carbon particles so that the residual organic pollutants in it are adsorbed again, and then enters the outer shell 341 along the two ends of the inner variable tube 343, and finally is discharged from the end cover 342, and then passes through the next activated carbon hollow column 34 and repeats the above process to achieve repeated adsorption and purification of sewage.

[0055] In addition, when the sewage flows faster, that is, the speed entering the inner variable tube 343 is greater than the speed of the sewage out of the inner variable tube 343, the inner variable tube 343 will be stretched, causing the space inside the inner variable tube 343 to change, and the gap between each activated carbon particle will increase, so that the contact with the sewage will be more complete, making it less likely for the activated carbon particles to block each other, resulting in better adsorption effect. At the same time, it is convenient for the sewage to pass through the activated carbon hollow column 34 faster, thereby accelerating the adsorption efficiency of the biological pool 3 on the sewage.

[0056] Based on Example 1, this example specifically defines the activated carbon hollow column 34, and the particle distance between the activated carbon particles can be adaptively changed according to the flow rate of the water flow.

[0057] It is worth noting that the specific structural setting of the polypropylene hollow column 35 can also be consistent with that of the activated carbon hollow column 34.

[0058] The above is only the best implementation method adopted by this application in combination with current actual needs, but the protection scope of this application is not limited to this.

Claims

1. A device for removing complex organic pollutants from soil, comprising a water tank (6) along the direction of water flow, two variable frequency water pumps (2), a microbial electrolysis axe (1), a biological pool (3), and two pump water axes (4) respectively located on both sides of the microbial electrolysis axe (1), characterized in that: Pipes are connected between the two variable frequency water pumps (2) and the biological pool (3), between the water tank (6) and one of the variable frequency water pumps (2), and between the variable frequency water pump (2) connected to the water tank (6) and the microbial electrolysis axe (1), and a solenoid valve is installed on the pipeline between the water tank (6) and the variable frequency water pump (2). A pump hose (43) is connected between the other variable frequency water pump (2) and the two pump axes (4). The microbial electrolysis axe (1) comprises a plurality of liquid pressing sheets (12) and a plurality of electrolytic blades (11) respectively located between two adjacent liquid pressing sheets (12). Liquid is installed on the upper ends of the electrolytic blades (11) and the liquid pressing sheets (12). The pressure support rod (13) is provided, the pressure plate (12) comprises a stainless steel pressure plate (123) and a soil cutting blade (115) fixedly connected to the lower end of the stainless steel pressure plate (123), a plurality of uniformly distributed water pressure holes (121) are drilled on the upper end of the stainless steel pressure plate (123), a pipe opening between the variable frequency water pump (2) and the microbial electrolysis axe (1) is connected to the microbial electrolysis axe (1) through the water pressure holes (121), a plurality of uniformly distributed water outlet holes (122) are drilled on the side of the stainless steel pressure plate (123), and the water pressure holes (121) and the water outlet holes (122) are both connected to the inside of the stainless steel pressure plate (123); The electrolytic blade (11) comprises a stainless steel hollow plate (111), a plastic support rod (113) connected between the left and right inner walls of the stainless steel hollow plate (111), a hard plastic (116) fixedly connected to the upper and lower inner walls of the stainless steel hollow plate (111), a plastic film carbon cloth (112) and a plastic film titanium-based aluminum dioxide (114) both connected between the two hard plastics (116), and a soil cutting blade (115) is also connected to the lower end of the stainless steel hollow plate (111); A liquid level detection probe (31) is installed at the upper end of the biological pool (3); a plurality of interlaced water blocking blocks (33) are fixedly connected to the left and right inner walls of the biological pool (3); a plurality of spherical Yulong fillers (32) are placed above each of the water blocking blocks (33); the uppermost water blocking block (33) is located just below the water inlet of the biological pool (3); the lowermost water blocking block (33) is located just above the water outlet of the biological pool (3); and a polypropylene hollow column (35) and a plurality of activated carbon hollow columns (34) are placed inside the water outlet of the biological pool (3).

2. The device for removing soil composite organic pollutants according to claim 1, characterized in that: The opening of the water outlet hole (122) facing the inside of the stainless steel liquid pressure plate (123) is covered with nylon cloth, and the nylon cloth is fixed to the edge of the opening of the water outlet hole (122) through a stainless steel mesh.

3. The device for removing soil composite organic pollutants according to claim 1, characterized in that: The water pump axe (4) has a water pumping port at the upper end, and the water pumping port is connected to and communicates with a water pumping hose (43). The water pumping axe (4) includes two hollow stainless steel plates (41) and three nylon mesh layers (42) located between the ends of the two hollow stainless steel plates (41) close to each other. A plurality of water pumping holes (44) are drilled on the hollow stainless steel plate (41) close to the microbial electrolysis axe (1), and the three nylon mesh layers (42) are fixed on the hollow stainless steel plate (41) by a stainless steel mesh.

4. The device for removing soil composite organic pollutants according to claim 3, characterized in that: The cross section of the hollow stainless steel plate (41) is an acute triangle, and the apex angles of the two hollow stainless steel plates (41) face downward and are in fixed contact with each other, and the two hollow stainless steel plates (41) and the plurality of nylon mesh layers (42) form an acute isosceles triangle.

5. The device for removing soil composite organic pollutants according to claim 1, characterized in that: The polypropylene hollow column (35) is filled with melt-blown polypropylene, and the activated carbon hollow column (34) is filled with activated carbon particles.

6. The device for removing soil composite organic pollutants according to claim 5, characterized in that: The activated carbon hollow column (34) comprises an outer shell (341), end covers (342) threadedly connected to two ends of the outer shell (341), and an inner variable tube (343) placed inside the outer shell (341), and the activated carbon particles are placed inside the inner variable tube (343).

7. The device for removing complex organic pollutants from soil according to claim 6, characterized in that: A long water inlet groove is bored in the middle of the outer shell (341), and the end surface of the inner variable tube (343) facing the long water inlet groove is a porous structure, and the inner variable tube (343) is made of elastic material.

8. The method for removing organic pollutants from soil according to claim 1, characterized in that: The following steps are involved: S1, along the direction of water flow, a water tank (6), two variable frequency water pumps (2), a microbial electrolysis axe (1), a biological pool (3), and two water pump axes (4) located on both sides of the microbial electrolysis axe (1); S2, pumping water in the water tank (6) into the microbial electrolysis axe (1) through the variable frequency water pump (2), and overflowing from the surface of the liquid pressing sheet (12), thereby contacting the electrolysis blade (11) and being electrolyzed by the electrolysis blade (11); S3, the electrolyzed water flows out of the microbial electrolysis axe (1), and then carries the organic pollutants in the soil and diffuses toward the water pump axe (4); S4, under the action of the variable frequency water pump (2), the water after electrolysis in the soil is pumped into the biological pool (3) through the water pump axe (4), and then passes through the spherical Yulong filler (32), the activated carbon hollow column (34) and the polypropylene hollow column (35) in the biological pool (3) in sequence, so that the pollutant particles in the sewage are fully absorbed; S5. Finally, the purified water is pumped into the water tank (6) again by the variable frequency water pump (2), and then pumped into the microbial electrolysis axe (1) for circulation, thereby removing organic pollutants in the soil.

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