Soil remediation device and remediation method

Abstract

The invention provides a soil remediation device and method, and belongs to the technical field of contaminated soil remediation, the soil remediation device comprises a frame, a shell surrounding the frame and rolling wheels, the rolling wheels are arranged at the bottommost part of the frame, the top of the frame is of a conical structure, the bottom of the conical structure is of a cylindrical structure, and an exhaust fan is arranged at the top of the conical structure; a spiral loosening thermalizer, a cyclone dust removal area, an electrolysis area, a photocatalysis area and an adsorption area are sequentially arranged in the frame from bottom to top. A gas collecting coaming is arranged outside the unscrewing thermalizer, the top of the gas collecting coaming is of a conical structure, a gas outlet is formed in the uppermost portion of the conical structure, the lower portion of the gas collecting coaming is of a multi-section sleeve type structure, and a handle and a hook are arranged on a sleeve at the bottommost end. The soil remediation device can effectively treat various volatile contaminated soil, is simple in structure and convenient to operate, can carry out soil remediation treatment on a contaminated site, does not need to excavate and backfill the soil, and has small disturbance to the soil.

Description

Technical Field

[0001] The present invention relates to the technical field of contaminated soil remediation, and in particular to a soil remediation device and a remediation method. Background Art

[0002] Soil remediation is an urgent problem to be solved. Soil remediation methods include chemical, physical and biological methods. Commonly used technologies are as follows:

[0003] 1. Chemical leaching, with the help of chemical solvents that can promote the dissolution or migration of pollutants in the soil environment, the leaching liquid is injected into the contaminated soil layer under the action of gravity or water head pressure, and then the solution containing pollutants is extracted from the soil and the wastewater is treated.

[0004] 2. Incineration method: burn the contaminated soil in an incinerator to decompose harmful substances into low-molecular flue gas. The flue gas is then dust-removed, cooled and purified before it meets emission standards.

[0005] 3. Thermodynamic remediation technology uses heat conduction, heat blankets, heat wells, heat walls, thermal radiation, radio wave heating, etc. to achieve the remediation of contaminated soil.

[0006] 4. Thermal desorption remediation technology heats the soil contaminated by organic matter to above the boiling point of the organic matter to volatilize the organic matter in the soil into gas and then treat the waste gas.

[0007] 5. The permeable reaction wall is a permeable wall containing reaction materials built in shallow soil and groundwater. When the polluted water passes through the wall, the pollutants in it undergo physical and chemical reactions with the reaction materials in the wall and are purified and removed.

[0008] 6. Landfill method: apply waste into the soil as a slurry, adjust the soil nutrition, moisture and pH value through fertilization, irrigation, lime addition, etc., and keep the pollutants aerobic degradation in the upper layer of the soil. For this, you can use a soil acidity meter to test the soil pH and moisture to check the soil improvement effect.

[0009] 7. Composting method: Use traditional composting methods to pile up contaminated soil and mix it with organic matter, straw, wheat straw, wood chips, bark, feces, etc., relying on microorganisms in the composting process to degrade difficult-to-degrade organic pollutants in the soil.

[0010] 8. Phytoremediation: using agricultural technology to improve the chemical and physical restrictive conditions of the soil that are unfavorable to plant growth, making it suitable for planting, and by planting preferred plants and their rhizosphere microorganisms to directly or indirectly absorb, volatilize, separate, and degrade pollutants, restore and rebuild the natural ecological environment and vegetation landscape.

[0011] 9. Bioremediation is a controlled or spontaneous process that uses organisms, especially microorganisms, to catalyze and degrade organic pollutants, thereby repairing the polluted environment or eliminating pollutants in the environment. Among them, microbial remediation technology uses the metabolic effects of native bacteria, foreign bacteria, genetically engineered bacteria, etc. on pollutants to transform and degrade pollutants, and is mainly used for the degradation of organic pollutants in the soil. By changing various environmental conditions such as nutrition, redox potential, and co-metabolism matrix, the degradation of microorganisms is enhanced to achieve the purpose of treatment.

[0012] Among them, chemical methods are expensive and prone to secondary pollution. The physical remediation process is costly and cannot be used for agricultural purposes after treatment, which causes dust and other pollution. Biological remediation is low-cost, does not change the nature of the soil, and does not cause secondary pollution, but it takes a long time, the degree of pollution cannot exceed the normal threshold of the remediation plants, and is greatly affected by the season.

[0013] The Chinese patent "A soil in-situ remediation device and method" (application number: 202110314929.1) discloses a soil in-situ remediation device and method, which is provided with rollers, gas collecting areas, heat preservation enclosures, loosening devices, lifters, oxidation areas, absorption areas, water removal areas, adsorption areas, exhaust fans, solar and wind power generation systems, and electric heaters from bottom to top. The device has an integrated structure, a simple structure, and occupies a small area. It can carry out soil remediation and treatment on-site at the pollution site, and the repaired soil can be directly backfilled in place without the need for excavation and backfilling of the soil. However, the patent still causes great disturbance to the soil. Summary of the invention

[0014] The purpose of the present invention is to provide a soil remediation device and a remediation method, which can effectively treat various volatile contaminated soils, have a simple structure, and are easy to operate. Soil remediation can be carried out on-site at the contaminated site without the need for excavation and backfilling of the soil, and the disturbance to the soil is also small.

[0015] To achieve the above object, the present invention provides the following technical solutions:

[0016] A soil remediation device comprises a frame, a shell surrounding the frame and a roller, wherein the roller is arranged at the bottom of the frame, the top of the frame is a conical structure, the bottom of the conical structure is arranged as a cylindrical structure, the top of the conical structure is arranged with an exhaust fan, and the inside of the frame is arranged with a loosening thermalizer, a cyclone dust removal area, an electrolysis area, a photocatalytic area, and an adsorption area in sequence from bottom to top.

[0017] The outside of the unscrewed heat exchanger is provided with an air collecting plate, the top of the air collecting plate is a conical structure, the uppermost part of the conical structure is provided with an air outlet, the lower part of the air collecting plate is a multi-section sleeve structure, and the lowermost sleeve is provided with a handle and a hook.

[0018] Furthermore, the loosening heater includes a loosening motor, a transmission shaft, a spiral impeller drill, an electric heater and a blower.

[0019] The loosening motor is arranged on the frame, the transmission shaft is uprightly arranged in the middle of the air collecting enclosure, the transmission shaft is a hollow cylindrical structure, the upper part of the transmission shaft is connected to the loosening motor, and the lower part of the transmission shaft is provided with a spiral impeller drill, the spiral impeller drill is a hollow structure, and a plurality of air outlet holes are provided on the spiral impeller drill.

[0020] The electric heater is arranged on one side of the loosening motor, and the air blower is arranged on one side of the electric heater. The air blower is connected with the transmission shaft, the spiral impeller drill and the electric heater through a pipeline.

[0021] Furthermore, an ejector is provided inside the cyclone dust removal area, an air inlet of the ejector is connected to an air outlet, and a plurality of soil discharge ports are provided on the bottom side wall of the cyclone dust removal area.

[0022] Furthermore, a cathode plate and an anode plate are arranged inside the electrolysis zone, and both the cathode plate and the anode plate are spiral wing-shaped electrode plates. Several ultrasonic generators are arranged between the cathode plate and the anode plate, and the cathode plate and the anode plate are connected to a DC power supply.

[0023] Furthermore, a flow partition is provided between the photocatalytic zone and the electrolysis zone, and the flow partition is two staggered flat plates, and an air flow channel is provided between the two flat plates.

[0024] A controller, a ballast and an ultraviolet lamp are arranged inside the photocatalytic zone, and an aluminum-based TiO2 net is arranged on the periphery of the ultraviolet lamp.

[0025] Furthermore, activated carbon is arranged inside the adsorption zone.

[0026] Furthermore, the soil remediation device is provided with an observation port and a maintenance and replacement port.

[0027] Furthermore, the frame is made of stainless steel, and the outer shell and the gas collecting enclosure are made of hard plastic plate or stainless steel plate.

[0028] Furthermore, the rollers are made of rubber material, and there are four rollers.

[0029] A method for repairing soil using a soil repair device of the present invention comprises the following steps:

[0030] S1. Move the soil remediation device to the upper part of the land to be remediated and lower the suspended gas collecting enclosure.

[0031] S2. Turn on the power switch, loosen the motor to start, the spiral impeller drill bit rotates and moves downward to drill into the soil to loosen the soil, and the hot air generated by the electric heater enters the loosened soil through the transmission shaft, the spiral impeller drill bit and the air outlet on the spiral impeller drill bit. The hot air heats the soil and causes the volatile components in the soil to escape.

[0032] S3. Volatile gas escapes from the soil and enters the ejector. The air flow ejected by the ejector performs spiral motion in the cyclone dust removal area. The dust-containing gas generates centrifugal force during the rotation process, which throws the soil particles with a density greater than that of the gas to the side wall of the cyclone dust removal area. The soil particles come into contact with the side wall of the cyclone dust removal area, lose inertia and fall along the wall under the action of gravity. The soil particles are separated from the gas and discharged from the soil discharge port at regular intervals.

[0033] S4. The waste gas enters the electrolysis area, passes through the anode plate and the cathode plate, and an oxidation reaction occurs on the spiral wing-shaped surface of the anode plate and the cathode plate, oxidizing the pollutants in the waste gas into harmless products including carbon dioxide. The ultrasonic wave generated by the ultrasonic generator promotes the turbulence and rotation effect of the waste gas, increasing the contact and mixing efficiency between the waste gas and the plates.

[0034] S5. The volatile waste gas continues to rise and enters the photocatalytic zone. The high-intensity, high-ozone ultraviolet lamp tube emits a high-energy ultraviolet light beam and ozone to irradiate the waste gas and synergistically decompose the waste gas. The pollutants in the waste gas are further oxidized and decomposed.

[0035] S6. The volatile waste gas continues to rise and enters the adsorption zone, and the substances contained in the volatile waste gas are intercepted and adsorbed in the adsorption zone.

[0036] S7. Finally, the gas is discharged by the exhaust fan to achieve standard emission.

[0037] S8. After the repair is completed, loosen the motor to reverse the spiral impeller drill and raise the spiral impeller drill; turn off the power; hold the handle on the sleeve, lift the sleeve and hang the hook on the sleeve on the side wall of the soil remediation device, waiting for the next round of repair operation.

[0038] Advantages of the present invention:

[0039] 1. The device has a simple structure, low manufacturing cost and easy operation.

[0040] 2. This device can carry out soil remediation on-site at the pollution site, without the need for excavation and backfilling of the soil, and with less disturbance to the soil.

[0041] 3. This device does not produce wastewater and there is no secondary pollution. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 It is a structural schematic diagram of the present invention;

[0043] In the figure: 1. roller;

[0044] 2. Gas collecting panel, 201. Gas outlet, 202. Handle;

[0045] 3. Unscrew the heater, 301. Unscrew the motor, 302. Drive shaft, 303. Spiral impeller drill, 304. Electric heater, 305. Blower;

[0046] 4. Cyclone dust removal area, 401. ejector, 402. soil discharge port;

[0047] 5. electrolysis area, 501, cathode plate, 502, anode plate, 503, ultrasonic generator;

[0048] 6. Photocatalytic zone;

[0049] 7. Adsorption area;

[0050] 8. Exhaust fan. DETAILED DESCRIPTION

[0051] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are 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 creative work are within the scope of protection of the present invention. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention.

[0052] like Figure 1 As shown, a soil remediation device includes a frame, a shell surrounding the frame and a roller 1, wherein the roller 1 is arranged at the bottom of the frame, the top of the frame is a conical structure, the bottom of the conical structure is arranged as a cylindrical structure, the top of the conical structure is arranged with an exhaust fan 8, and the inside of the frame is arranged with a loosening thermalizer 3, a cyclone dust removal area 4, an electrolysis area 5, a photocatalytic area 6, and an adsorption area 7 in sequence from bottom to top.

[0053] The outside of the unscrewed heat exchanger 3 is provided with an air collecting plate 2, the top of the air collecting plate 2 is a conical structure, the uppermost part of the conical structure is provided with an air outlet 201, the lower part of the air collecting plate is a multi-section sleeve structure, and the bottom sleeve is provided with a handle 202 and a hook.

[0054] As a preferred embodiment of the present invention, the loosening heater 3 includes a loosening motor 301 , a transmission shaft 302 , a spiral impeller drill 303 , an electric heater 304 and a blower 305 .

[0055] The unscrewing motor 301 is arranged on the frame, and the transmission shaft 302 is uprightly arranged in the middle of the gas collecting enclosure 2. The transmission shaft 302 is a hollow cylindrical structure. The upper part of the transmission shaft 302 is connected to the unscrewing motor 301, and the unscrewing motor 301 drives the transmission shaft 302 to rotate.

[0056] A spiral impeller drill 303 is disposed at the lower portion of the transmission shaft 302 . The spiral impeller drill 303 is a hollow structure and is provided with a plurality of air outlet holes.

[0057] The electric heater 304 is arranged at one side of the loosening motor 301 , and the air blower 305 is arranged at one side of the electric heater 304 . The air blower 305 is connected with the transmission shaft 302 , the spiral impeller drill 303 and the electric heater 304 through a pipeline.

[0058] The spiral impeller drill 303 cuts and loosens the soil, and the hot air generated by the electric heater 304 enters the loosened soil through the transmission shaft 302, the spiral impeller drill 303 and the air outlet holes on the spiral impeller drill 303. The hot air heats the soil, causing volatile components in the soil to escape.

[0059] As a preferred embodiment of the present invention, an ejector 401 is provided inside the cyclone dust removal zone 4 , the air inlet of the ejector 401 is connected to the air outlet 201 , and a plurality of soil discharge ports 402 are provided on the bottom side wall of the cyclone dust removal zone 4 .

[0060] The air flow ejected by the ejector 401 performs a spiral motion in the cyclone dust removal area 4. The dust-containing gas generates centrifugal force during the rotation process, which throws the soil particles with a density greater than that of the gas to the side wall of the cyclone dust removal area 4. The soil particles come into contact with the side wall of the cyclone dust removal area 4, lose their inertia, and fall along the wall under the action of gravity, and the soil particles are separated from the gas.

[0061] As a preferred embodiment of the present invention, a cathode plate 501 and an anode plate 502 are arranged inside the electrolysis zone 5, and the cathode plate 501 and the anode plate 502 are both spiral wing-shaped electrode plates. The spiral wing-shaped electrode plates can better receive the swirling airflow from the cyclone dust removal zone 4. On the other hand, the spiral wing-shaped electrode plates provide a larger surface area, which can further increase the contact area between the exhaust gas and the electrode, enhance the mass transfer between the pollutants in the exhaust gas and the electrode, and improve the reaction efficiency.

[0062] A plurality of ultrasonic generators 503 are disposed between the cathode plate 501 and the anode plate 502 , and the cathode plate 501 and the anode plate 502 are connected to a direct current power source.

[0063] As a preferred embodiment of the present invention, a flow partition is provided between the photocatalytic zone 6 and the electrolytic zone 5. The flow partition is two staggered flat plates, and an air flow channel is provided between the two flat plates.

[0064] The photocatalytic zone 6 is provided with a controller, a ballast and an ultraviolet lamp tube, and the periphery of the ultraviolet lamp tube is provided with an aluminum-based TiO2 mesh.

[0065] As a preferred embodiment of the present invention, activated carbon is arranged inside the adsorption area 7. The activated carbon is required to have the advantages of developed pores, large specific surface area, fast adsorption speed, anti-friction, and anti-washing. If the gas velocity is reduced after a long period of operation, the activated carbon needs to be replaced in time.

[0066] As a preferred embodiment of the present invention, the soil remediation device is provided with an observation port and a maintenance and replacement port.

[0067] As a preferred embodiment of the present invention, the frame is made of stainless steel, and the outer shell and the gas collecting enclosure 2 are made of hard plastic plate or stainless steel plate.

[0068] As a preferred embodiment of the present invention, the roller 1 is made of rubber material, and the number of the rollers 1 is four.

[0069] A method for repairing soil using a soil repair device of the present invention comprises the following steps:

[0070] S1. Move the soil remediation device to the upper part of the land to be remediated and lower the suspended gas collecting enclosure 2.

[0071] S2. Turn on the power switch, start the loosening motor 301, and the spiral impeller drill 303 rotates and moves downward to drill into the soil to loosen the soil. The hot air generated by the electric heater 304 enters the loosened soil through the transmission shaft 302, the spiral impeller drill 303 and the air outlet on the spiral impeller drill 303. The hot air heats the soil to allow volatile components in the soil to escape.

[0072] S3. Volatile gas escapes from the soil and enters the ejector 401. The air flow ejected by the ejector 401 performs spiral motion in the cyclone dust removal area 4. The dust-containing gas generates centrifugal force during the rotation process, and the soil particles with a density greater than that of the gas are thrown toward the side wall of the cyclone dust removal area 4. The soil particles come into contact with the side wall of the cyclone dust removal area 4, lose inertia, and fall along the wall under the action of gravity. The soil particles are separated from the gas and are regularly discharged from the soil discharge port 402.

[0073] S4. The waste gas enters the electrolysis zone 5, passes through the anode plate 502 and the cathode plate 501, and an oxidation reaction occurs on the spiral wing-shaped surface of the anode plate 502 and the cathode plate 501, oxidizing the pollutants in the waste gas into harmless products including carbon dioxide. The ultrasonic wave generated by the ultrasonic generator 503 promotes the turbulence and rotation effect of the waste gas, and increases the contact and mixing efficiency between the waste gas and the plates.

[0074] S5. The volatile waste gas continues to rise and enters the photocatalytic zone 6. The high-intensity, high-ozone ultraviolet lamp tube emits a high-energy ultraviolet light beam and ozone to irradiate the waste gas, synergistically decompose the waste gas, and the pollutants in the waste gas are further oxidized and decomposed.

[0075] S6. The volatile waste gas continues to rise and enters the adsorption zone 7, and the substances contained in the volatile waste gas are intercepted and adsorbed in the adsorption zone 7.

[0076] S7. Finally, the gas is discharged by the exhaust fan 8 to achieve standard emission.

[0077] S8. After the repair is completed, loosen the motor 301 to reverse the spiral impeller drill 303 and raise the spiral impeller drill 303; turn off the power; hold the handle 202 on the sleeve, lift the sleeve and hang the hook on the sleeve on the side wall of the soil remediation device, waiting for the next round of repair operation.

[0078] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art can still adjust the technical solutions described in the above embodiments or replace some of the technical features by equivalents. Therefore, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention is also intended to include these modifications and variations.

Claims

1. A soil remediation device, comprising a frame, a shell surrounding the frame and a roller (1), wherein the roller (1) is arranged at the bottom of the frame, and is characterized in that: The top of the frame is a conical structure, the bottom of the conical structure is a cylindrical structure, the top of the conical structure is provided with an exhaust fan (8), and the inside of the frame is provided with a swivel thermalizer (3), a cyclone dust removal area (4), an electrolysis area (5), a photocatalytic area (6), and an adsorption area (7) in sequence from bottom to top; The unscrewing heat exchanger (3) is provided with an air collecting plate (2) on the outside, the top of the air collecting plate (2) is a conical structure, the uppermost part of the conical structure is provided with an air outlet (201), the lower part of the air collecting plate is a multi-section sleeve structure, and the sleeve at the bottom is provided with a handle (202) and a hook.

2. A soil remediation device according to claim 1, characterized in that: The loosening heater (3) comprises a loosening motor (301), a transmission shaft (302), a spiral impeller drill (303), an electric heater (304) and a blower (305); The loosening motor (301) is arranged on the frame, the transmission shaft (302) is uprightly arranged in the middle of the gas collecting enclosure (2), the transmission shaft (302) is a hollow cylindrical structure, the upper part of the transmission shaft (302) is connected to the loosening motor (301), and the lower part of the transmission shaft (302) is provided with a spiral impeller drill (303), the spiral impeller drill (303) is a hollow structure, and a plurality of air outlet holes are arranged on the spiral impeller drill (303); The electric heater (304) is arranged on one side of the loosening motor (301), and the air blower (305) is arranged on one side of the electric heater (304). The air blower (305) is connected to the transmission shaft (302), the spiral impeller drill (303) and the electric heater (304) through a pipeline.

3. A soil remediation device according to claim 2, characterized in that: An ejector (401) is arranged inside the cyclone dust removal area (4), an air inlet of the ejector (401) is connected to an air outlet (201), and a plurality of soil discharge ports (402) are arranged on the bottom side wall of the cyclone dust removal area (4).

4. A soil remediation device according to claim 3, characterized in that: A cathode plate (501) and an anode plate (502) are arranged inside the electrolysis zone (5); both the cathode plate (501) and the anode plate (502) are spiral wing-shaped electrode plates; a plurality of ultrasonic generators (503) are arranged between the cathode plate (501) and the anode plate (502); and the cathode plate (501) and the anode plate (502) are connected to a direct current power supply.

5. A soil remediation device according to claim 4, characterized in that: A flow partition is provided between the photocatalytic zone (6) and the electrolytic zone (5), wherein the flow partition is two staggered flat plates, and an air flow channel is provided between the two flat plates; A controller, a ballast and an ultraviolet light tube are arranged inside the photocatalytic zone (6), and an aluminum-based TiO2 mesh is arranged on the periphery of the ultraviolet light tube.

6. A soil remediation device according to claim 5, characterized in that: Activated carbon is arranged inside the adsorption zone (7).

7. A soil remediation device according to claim 6, characterized in that: The soil remediation device is provided with an observation port and a maintenance and replacement port.

8. A soil remediation device according to claim 7, characterized in that: The frame is made of stainless steel, and the outer shell and the gas collecting enclosure (2) are made of hard plastic plates or stainless steel plates.

9. A soil remediation device according to claim 8, characterized in that: The rollers (1) are made of rubber material, and there are four rollers (1).

10. A method for soil remediation using a soil remediation device according to any one of claims 1 to 9, characterized in that: The following steps are involved: S1. Move the soil remediation device to the upper part of the land to be remediated and put down the suspended gas collecting panel (2); S2. Turn on the power switch, start the loosening motor (301), rotate the spiral impeller drill (303) and move downward to drill into the soil to loosen the soil, and the hot air generated by the electric heater (304) enters the loosened soil through the transmission shaft (302), the spiral impeller drill (303) and the air outlet on the spiral impeller drill (303), and the hot air heats the soil, so that the volatile components in the soil escape; S3. The volatile gas escapes from the soil and enters the ejector (401). The air flow ejected from the ejector (401) performs a spiral motion in the cyclone dust removal area (4). The dust-containing gas generates centrifugal force during the rotation process, and the soil particles with a density greater than that of the gas are thrown toward the side wall of the cyclone dust removal area (4). The soil particles contact the side wall of the cyclone dust removal area (4), lose their inertial force, and fall along the wall under the action of gravity. The soil particles are separated from the gas and are discharged from the soil discharge port (402) at regular intervals. S4. The waste gas enters the electrolysis zone (5), passes through the anode plate (502) and the cathode plate (501), and an oxidation reaction occurs on the spiral wing-shaped surface of the anode plate (502) and the cathode plate (501), oxidizing the pollutants in the waste gas into harmless products including carbon dioxide. The ultrasonic wave generated by the ultrasonic generator (503) promotes the turbulence and rotation effect of the waste gas, thereby increasing the contact and mixing efficiency between the waste gas and the plates; S5. The volatile waste gas continues to rise and enters the photocatalytic zone (6). The high-intensity, high-ozone ultraviolet lamp emits a high-energy ultraviolet light beam and ozone to irradiate the waste gas, synergistically decompose the waste gas, and the pollutants in the waste gas are further oxidized and decomposed; S6. The volatile waste gas continues to rise and enters the adsorption zone (7), and the substances contained in the volatile waste gas are intercepted and adsorbed in the adsorption zone (7); S7. Finally, the gas is discharged by the exhaust fan (8) to achieve standard emission; S8. After the current repair is completed, the motor (301) is loosened to reverse the spiral impeller drill (303) and the spiral impeller drill (303) is raised; the power is turned off; the handle (202) on the sleeve is held, the sleeve is lifted and the hook on the sleeve is hung on the side wall of the soil repair device, waiting for the next round of repair operation.

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