CN114669572A - Leachate treatment device and method for refuse landfill - Google Patents
Leachate treatment device and method for refuse landfill Download PDFInfo
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- CN114669572A CN114669572A CN202210313049.7A CN202210313049A CN114669572A CN 114669572 A CN114669572 A CN 114669572A CN 202210313049 A CN202210313049 A CN 202210313049A CN 114669572 A CN114669572 A CN 114669572A
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- 238000000034 method Methods 0.000 title claims abstract description 9
- 239000007788 liquid Substances 0.000 claims abstract description 39
- 238000000429 assembly Methods 0.000 claims abstract description 4
- 230000000712 assembly Effects 0.000 claims abstract description 4
- 239000000945 filler Substances 0.000 claims description 14
- 238000004873 anchoring Methods 0.000 claims description 9
- 238000007789 sealing Methods 0.000 claims description 9
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 8
- 238000007599 discharging Methods 0.000 claims description 7
- 239000004576 sand Substances 0.000 claims description 4
- 238000009434 installation Methods 0.000 claims 1
- 230000000149 penetrating effect Effects 0.000 claims 1
- 238000001914 filtration Methods 0.000 description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 238000001764 infiltration Methods 0.000 description 3
- 230000008595 infiltration Effects 0.000 description 3
- 238000000926 separation method Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000149 chemical water pollutant Substances 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
- B09B1/00—Dumping solid waste
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Abstract
The invention relates to the field of garbage disposal devices, in particular to a leachate treatment device and a leachate treatment method for a garbage landfill, which comprise a base, a garbage dam and a leachate collection assembly; the main calandria passes through the garbage dam; the plurality of groups of vertical pipes a are arranged on the main exhaust pipe, the tops of the vertical pipes a are closed and provided with conducting wire through holes, and the tops of the vertical pipes a penetrate through the covering layer; the vertical pipe b is arranged at the top of the vertical pipe a; the electric telescopic rod is arranged on the inner wall of the top of the vertical pipe a, and the bottom of the electric telescopic rod is connected with the top of the piston plate a; the air outlet pipe penetrates through the piston plate a and is provided with an electric control valve; the elastic rod is arranged at the bottom of the piston plate a, and the piston plate b is arranged at the bottom of the elastic rod; a plurality of groups of percolate collecting assemblies are arranged; and arranging a control system on the foundation. In the invention, the collection of the percolate is accelerated through the liquid inlet hole a and the liquid inlet hole b, the collection speed of the percolate is improved by combining the negative pressure drainage of the vertical pipe a, and in addition, the vertical pipe a has the functions of collecting the percolate and exhausting simultaneously.
Description
Technical Field
The invention relates to the field of garbage treatment devices, in particular to a leachate treatment device and a leachate treatment method for a garbage landfill.
Background
The landfill leachate refers to high-concentration organic wastewater formed by passing through a landfill layer and a soil covering layer and water leaked from accumulated garbage ready for incineration, which is derived from water contained in the garbage in a garbage landfill, rain, snow and water entering the landfill and other water. At present, the common garbage leachate collection and treatment system is provided with a pipeline inserted into the bottom of a landfill site, a plurality of holes are arranged on the pipeline for collecting leachate, the leachate with the structure is discharged slowly, and the leachate generated at the top needs to go through a long path to reach the bottom end and is discharged from the pipeline, so that the rapid discharge and subsequent treatment of the leachate are not facilitated.
Chinese patent with the publication number of CN214004099U discloses a leachate treatment device for refuse landfill, which can collect and treat leachate in the piled refuse, and has the advantages of simple structure, convenient use, relatively low cost, small and portable device, suitability for popularization and use in small refuse landfill, capability of treating refuse piles with different thicknesses, and widened use scene and range of the device.
However, the above-mentioned known solutions have the following disadvantages: the disclosed technical structure cannot be used in a landfill site, the transversely arranged dredging mechanism cannot be inserted into landfill garbage, and the landfill site only uses the sealing covering layer arranged at the top to possibly cause the possibility of inserting an external mechanism, so that the disclosed structure cannot be suitable for the landfill garbage of a fixed structure.
Disclosure of Invention
The invention aims to provide a percolate treatment device and a percolate treatment method of a refuse landfill, which can quickly discharge percolate, aiming at the problems in the background art.
On one hand, the invention provides a leachate treatment device for a refuse landfill, which comprises a base, a refuse dam and a leachate collection assembly, wherein the base is provided with a water inlet and a water outlet; the percolate collecting assembly comprises a main discharge pipe, a vertical pipe a, a vertical pipe b, an electric telescopic rod, a piston plate a, an air outlet pipe and an elastic rod;
a refuse landfill pit is formed in the base, a covering layer is arranged at the top of the base, a refuse dam and the covering layer enclose a closed refuse landfill cavity, and an impermeable layer is arranged at the bottom of the base;
the main discharge pipe transversely penetrates through the garbage dam, a plurality of groups of liquid inlet holes a are formed in the main discharge pipe, and porous fillers a are arranged on the wall of each liquid inlet hole a; the vertical pipes a are vertically arranged on the main discharge pipe, a plurality of groups of the vertical pipes a are arranged in parallel, a plurality of groups of liquid inlet holes b are formed in the pipe wall of the vertical pipe a, porous fillers b are arranged on the hole walls of the liquid inlet holes b, the top of the vertical pipe a is closed and is provided with a conducting wire through hole, and the top of the vertical pipe a penetrates through the covering layer; the vertical pipe b is arranged at the top of the vertical pipe a; the electric telescopic rod is vertically arranged on the inner wall of the top of the vertical pipe a, the bottom of the electric telescopic rod is connected with the top of the piston plate a, and the piston plate a is arranged in the vertical pipe a in a matching mode; the air outlet pipe vertically penetrates through the piston plate a and is provided with an electric control valve; the elastic rod is vertically arranged at the bottom of the piston plate a, the bottom of the elastic rod is horizontally provided with a piston plate b, the piston plate b is positioned in the main exhaust pipe, and the diameter of the piston plate b is larger than that of the piston plate a; a plurality of groups of percolate collecting assemblies are arranged; and a control system is arranged on the foundation and is in control connection with both the electric telescopic rod and the electric control valve.
Preferably, the connection part of the base and the covering layer is provided with a longitudinal anchoring ditch, the end part of the covering layer is attached to the anchoring ditch, and the anchoring ditch is filled with gravels.
Preferably, the porous filler a and the porous filler b are graded sand.
Preferably, the liquid inlet hole b is arranged in a downward inclination mode, and the inclination angle is forty-five degrees to sixty degrees.
Preferably, the top of the piston plate b is provided with a guide circular truncated cone, the size of the upper end face of the guide circular truncated cone is smaller than that of the lower end face of the guide circular truncated cone, and the diameter of the upper end face of the guide circular truncated cone is smaller than that of the inner circumference of the vertical pipe a.
Preferably, a guide plate is arranged on the inner wall of the bottom of the main calandria, and the upper end face of the guide plate is an inclined arc-shaped face inclined towards the lower right.
Preferably, a wire sealing ring is arranged on the wall of the wire through hole.
On the other hand, the invention provides a percolate collecting and treating method of a percolate treating device of a refuse landfill, which comprises the following steps: s1, filling the garbage between the base and the garbage dam, and capping with a covering layer, wherein the covering layer is used for sealing the hole through which the vertical pipe a passes; s2, enabling the percolate to enter the main discharge pipe through the liquid inlet hole a and then to be discharged into a treatment pool through the main discharge pipe for treatment; s3, the control system controls the electric telescopic rod to contract periodically to drive the piston plate a, the elastic rod and the piston plate b to ascend, the piston plate b ascends to seal the bottom of the vertical pipe a, the piston plate a continuously ascends, the elastic rod is pulled, negative pressure is formed between the piston plate a and the piston plate b, percolate near the vertical pipe a can be sucked into the vertical pipe a, and the electric control valve is in a closed state when the electric telescopic rod contracts; s4, the electric telescopic rod extends after contracting to the maximum degree, the electric control valve is opened at the moment, gas between the piston plate a and the piston plate b can enter an external methane storage tank through the gas outlet pipe and the vertical pipe b, and meanwhile, the elastic rod is gradually restored; and S5, the piston plate b moves downwards to be separated from the vertical pipe a, and the percolate in the vertical pipe a flows into the main drainage pipe and then is drained into the treatment pool through the main drainage pipe for treatment.
Compared with the prior art, the invention has the following beneficial technical effects: filling garbage between a base and a garbage dam, capping by using a capping layer, sealing the hole through which the vertical pipe a passes by the capping layer, allowing percolate to enter a main discharge pipe through a liquid inlet hole a, and then discharging the percolate into a treatment tank through the main discharge pipe, wherein a control system periodically controls an electric telescopic rod to contract to drive a piston plate a, an elastic rod and a piston plate b to ascend, the piston plate b ascends to seal the bottom of the vertical pipe a, the piston plate a continuously ascends, the elastic rod is pulled into the piston plate a, negative pressure is formed between the piston plate a and the piston plate b to suck the percolate nearby the vertical pipe a into the vertical pipe a, the electric control valve is in a closed state when the electric telescopic rod contracts, the electric telescopic rod starts to extend after contracting to the maximum degree, the electric control valve is opened at the moment, and gas between the piston plate a and the piston plate b can enter an external methane storage tank through a gas outlet pipe and the vertical pipe b, meanwhile, the elastic rod is gradually restored, the piston plate b moves downwards to be separated from the vertical pipe a, and the percolate in the vertical pipe a flows into the main drainage pipe and then is drained into the treatment pool through the main drainage pipe for treatment. Accelerate the collection of filtration liquid through feed liquor hole an and feed liquor hole b, in the negative pressure drainage that combines standpipe a enables the not high filtration liquid of vertical direction to get into standpipe a fast, reduce the decurrent infiltration distance of filtration liquid, further improve the collection speed of filtration liquid, standpipe a compromises simultaneously in addition and collects filtration liquid and exhaust function, with the gas outgoing of landfill production, the follow-up separation of being convenient for is used.
Drawings
FIG. 1 is a schematic structural diagram of an embodiment of the present invention;
FIG. 2 is a front cross-sectional view of FIG. 1;
FIG. 3 is a schematic view of the leachate collection module;
FIG. 4 is a partial schematic view of a cross-sectional view of the leachate collection assembly;
fig. 5 is an enlarged schematic view of a portion a in fig. 3.
Reference numerals: 1. a base; 2. a refuse dam; 3. a cover layer; 4. a main calandria; 5. a liquid inlet hole a; 6. a porous filler a; 7. a vertical pipe a; 8. a vertical pipe b; 9. a liquid inlet hole b; 10. a porous filler b; 11. an electric telescopic rod; 12. a piston plate a; 13. an electrically controlled valve; 14. an air outlet pipe; 15. an elastic rod; 16. a piston plate b; 17. a guide circular table; 18. a baffle; 19. and a wire sealing ring.
Detailed Description
Example one
The invention provides a leachate treatment device for a refuse landfill, which comprises a base 1, a refuse dam 2 and a leachate collection assembly, wherein the base comprises a base body and a filter; the percolate collecting assembly comprises a main discharge pipe 4, a vertical pipe a7, a vertical pipe b8, an electric telescopic rod 11, a piston plate a12, an air outlet pipe 14 and an elastic rod 15;
as shown in figure 1, a refuse landfill pit is formed in a base 1, a covering layer 3 is arranged on the top of the base 1, a longitudinal anchoring ditch is arranged at the joint of the base 1 and the covering layer 3, the end part of the covering layer 3 is attached to the anchoring ditch, gravels are filled in the anchoring ditch, a closed refuse landfill cavity is defined by the base 1, a refuse dam 2 and the covering layer 3, and an impermeable layer is arranged at the bottom of the base 1.
As shown in fig. 2-5, the main discharging pipe 4 transversely penetrates through the garbage dam 2, the inner wall of the bottom of the main discharging pipe 4 is provided with a flow guide plate 18, the upper end surface of the flow guide plate 18 is an inclined arc-shaped surface inclined towards the lower right, a plurality of groups of liquid inlet holes a5 are arranged on the pipeline of the main discharging pipe 4, and the hole wall of the liquid inlet hole a5 is provided with porous filler a 6; the vertical pipes a7 are vertically arranged on the main calandria 4, a plurality of groups of vertical pipes a7 are arranged in parallel, a plurality of groups of liquid inlet holes b9 are arranged on the pipe wall of the vertical pipes a7, porous fillers b10 are arranged on the hole wall of the liquid inlet holes b9, the tops of the vertical pipes a7 are closed and provided with wire through holes, wire sealing rings 19 are arranged on the hole walls of the wire through holes, and the tops of the vertical pipes a7 penetrate through the covering layer 3; the standpipe b8 is arranged at the top of the standpipe a 7; the electric telescopic rod 11 is vertically arranged on the inner wall of the top of the vertical pipe a7, the bottom of the electric telescopic rod 11 is connected with the top of the piston plate a12, and the piston plate a12 is arranged in the vertical pipe a7 in a matching mode; the air outlet pipe 14 vertically penetrates through the piston plate a12, and the electric control valve 13 is arranged on the air outlet pipe 14; the elastic rod 15 is vertically arranged at the bottom of the piston plate a12, the bottom of the elastic rod 15 is horizontally provided with a piston plate b16, the piston plate b16 is positioned in the main exhaust pipe 4, the diameter of the piston plate b16 is larger than that of the piston plate a12, the top of the piston plate b16 is provided with a guide circular table 17, the size of the upper end face of the guide circular table 17 is smaller than that of the lower end face thereof, and the diameter of the upper end face of the guide circular table 17 is smaller than that of the inner circumference of the standpipe a 7; a plurality of groups of percolate collecting assemblies are arranged; a control system is arranged on the base 1 and is in control connection with the electric telescopic rod 11 and the electric control valve 13.
The process of accelerating the collection of leachate in this embodiment is as follows: filling garbage between a base 1 and a garbage dam 2, capping with a capping layer 3, sealing the hole of the capping layer 3 through which the vertical pipe a7 passes, allowing percolate to enter a main discharge pipe 4 through a liquid inlet hole a5, and then discharging the percolate into a treatment tank through the main discharge pipe 4, wherein the control system periodically controls the contraction of an electric telescopic rod 11 to drive a piston plate a12, an elastic rod 15 and a piston plate b16 to ascend, a piston plate b16 to ascend to seal the bottom of a7 of the vertical pipe a, the piston plate a12 continuously ascends, the elastic rod 15 is pulled into, a negative pressure is formed between the piston plate a12 and the piston plate b16, the percolate near the vertical pipe a7 can be sucked into the vertical pipe a7, the electric telescopic rod 11 is contracted, the electric control valve 13 is in a closed state, the electric telescopic rod 11 is contracted to the maximum degree and then begins to expand, the electric control valve 13 is opened, and gas between the electric control valve a12 and the piston plate b16 can enter an external biogas storage tank through an outlet pipe 14 and the vertical pipe b8, at the same time, the elastic rod 15 is gradually restored, the piston plate b16 moves downwards to be separated from the vertical pipe a7, and the percolate in the vertical pipe a7 flows into the main drainage pipe 4 and then is drained into the treatment tank through the main drainage pipe 4 for treatment. In this embodiment, accelerate the collection of filtration liquid through feed liquor hole a5 and feed liquor hole b9, the negative pressure drainage of combination standpipe a7 enables the filtration liquid of vertical direction co-altitude not to get into standpipe a7 fast in, reduce the downward infiltration journey of filtration liquid, further improve the collection speed of filtration liquid, standpipe a7 gives consideration to simultaneously collecting filtration liquid and exhaust function in addition, with the gaseous discharge that landfill produced, the follow-up separation of being convenient for is used.
Example two
As shown in fig. 4, compared with the first embodiment, the leachate treatment apparatus for a landfill site provided by the present invention has the liquid inlet b9 tilted downward at an angle ranging from forty-five degrees to sixty degrees, and both the porous filler a6 and the porous filler b10 are graded sand.
In this embodiment, the downwardly inclined liquid inlet hole b9 can facilitate the entry of leachate, graded sandstone provides isolation while ensuring leachate to pass through, and prevents garbage from entering the standpipe a7 and the main drainage pipe 4.
EXAMPLE III
The leachate collection and treatment method based on the leachate treatment device of the refuse landfill comprises the following steps:
s1, filling the garbage between the base 1 and the garbage dam 2, and capping with a covering layer 3, wherein the covering layer 3 is used for sealing the hole through which the vertical pipe a7 passes;
s2, making the percolate enter the main discharge pipe 4 through the liquid inlet hole a5, and then discharging the percolate into a treatment pool through the main discharge pipe 4 for treatment;
s3, the control system controls the electric telescopic rod 11 to contract periodically to drive the piston plate a12, the elastic rod 15 and the piston plate b16 to ascend, the piston plate b16 ascends to seal the bottom of the vertical tube a7, the piston plate a12 continuously ascends, the elastic rod 15 is pulled, negative pressure is formed between the piston plate a12 and the piston plate b16, percolate near the vertical tube a7 can be sucked into the vertical tube a7, and the electric control valve 13 is in a closed state when the electric telescopic rod 11 contracts;
s4, the electric telescopic rod 11 extends after contracting to the maximum degree, the electric control valve 13 is opened at the moment, the gas between the piston plate a12 and the piston plate b16 can enter an external methane storage tank through the gas outlet pipe 14 and the vertical pipe b8, and the elastic rod 15 is gradually restored;
s5, the piston plate b16 moves downward to disengage the standpipe a7, and the percolate in the standpipe a7 flows into the main pipe 4 and then is discharged into the treatment tank through the main pipe 4 for treatment.
In this embodiment, accelerate the collection of filtration liquid through feed liquor hole a5 and feed liquor hole b9, the negative pressure drainage of combination standpipe a7 enables the filtration liquid of vertical direction co-altitude not to get into standpipe a7 fast in, reduce the downward infiltration journey of filtration liquid, further improve the collection speed of filtration liquid, standpipe a7 gives consideration to simultaneously collecting filtration liquid and exhaust function in addition, with the gaseous discharge that landfill produced, the follow-up separation of being convenient for is used.
The embodiments of the present invention have been described in detail with reference to the drawings, but the present invention is not limited thereto, and various changes can be made within the knowledge of those skilled in the art without departing from the gist of the present invention.
Claims (8)
1. The leachate treatment device for the refuse landfill is characterized by comprising a base (1), a refuse dam (2) and a leachate collection assembly; the percolate collecting assembly comprises a main discharge pipe (4), a vertical pipe a (7), a vertical pipe b (8), an electric telescopic rod (11), a piston plate a (12), an air outlet pipe (14) and an elastic rod (15);
a refuse landfill pit is formed in the base (1), a covering layer (3) is arranged on the top of the base (1), a closed refuse landfill cavity is defined by the base (1), the refuse dam (2) and the covering layer (3), and an impermeable layer is arranged at the bottom of the base (1);
the main discharge pipe (4) transversely penetrates through the garbage dam (2), a plurality of groups of liquid inlet holes a (5) are formed in the pipeline of the main discharge pipe (4), and porous fillers a (6) are arranged on the wall of each liquid inlet hole a (5); the vertical pipes a (7) are vertically arranged on the main pipe bank (4), a plurality of groups of the vertical pipes a (7) are arranged in parallel, a plurality of groups of liquid inlet holes b (9) are formed in the pipe walls of the vertical pipes a (7), porous fillers b (10) are arranged on the hole walls of the liquid inlet holes b (9), the tops of the vertical pipes a (7) are sealed and provided with wire through holes, and the tops of the vertical pipes a (7) penetrate through the covering layer (3); the vertical pipe b (8) is arranged at the top of the vertical pipe a (7); the electric telescopic rod (11) is vertically arranged on the inner wall of the top of the vertical pipe a (7), the bottom of the electric telescopic rod (11) is connected with the top of the piston plate a (12), and the piston plate a (12) is arranged in the vertical pipe a (7) in a matching mode; the air outlet pipe (14) is vertically arranged on the piston plate a (12) in a penetrating way, and the electric control valve (13) is arranged on the air outlet pipe (14); the elastic rod (15) is vertically arranged at the bottom of the piston plate a (12), the piston plate b (16) is horizontally arranged at the bottom of the elastic rod (15), the piston plate b (16) is positioned in the main exhaust pipe (4), and the diameter of the piston plate b (16) is larger than that of the piston plate a (12); a plurality of groups of percolate collecting assemblies are arranged; a control system is arranged on the base (1), and the control system is in control connection with the electric telescopic rod (11) and the electric control valve (13).
2. The leachate treatment plant according to claim 1, wherein the base (1) is connected to the covering layer (3) by a longitudinal anchoring channel, the end of the covering layer (3) is attached to the anchoring channel, and the anchoring channel is filled with sand.
3. The leachate treatment installation according to claim 1, wherein the porous filler a (6) and the porous filler b (10) are graded sand.
4. The leachate treatment plant according to claim 1, wherein the inlet holes b (9) are inclined downward at an angle of forty-five to sixty degrees.
5. The leachate treatment plant according to claim 1, wherein the piston plate b (16) is provided at the top with a guide circular truncated cone (17), the size of the upper end surface of the guide circular truncated cone (17) is smaller than that of the lower end surface thereof, and the diameter of the upper end surface of the guide circular truncated cone (17) is smaller than that of the inner circumference of the standpipe a (7).
6. The leachate treatment plant according to claim 1, wherein the inner wall of the bottom of the main discharge pipe (4) is provided with a flow guide plate (18), and the upper end surface of the flow guide plate (18) is an inclined arc surface inclined to the lower right.
7. The leachate treatment plant according to claim 1, wherein the wall of the conducting wire through hole is provided with a conducting wire sealing ring (19).
8. A leachate collection treatment method of leachate treatment plant of landfill according to claim 1, comprising the steps of:
s1, filling the garbage between the base (1) and the garbage dam (2), and capping with a covering layer (3), wherein the covering layer (3) seals the hole through which the vertical pipe a (7) passes;
s2, making the percolate enter the main calandria (4) through the liquid inlet hole a (5), and then discharging the percolate into the treatment tank through the main calandria (4) for treatment;
s3, the control system controls the electric telescopic rod (11) to contract periodically to drive the piston plate a (12), the elastic rod (15) and the piston plate b (16) to ascend, the piston plate b (16) ascends to seal the bottom of the vertical pipe a (7), the piston plate a (12) continuously ascends, the elastic rod (15) is pulled, negative pressure is formed between the piston plate a (12) and the piston plate b (16) to suck percolate nearby the vertical pipe a (7) into the vertical pipe a (7), and the electric control valve (13) is in a closed state when the electric telescopic rod (11) contracts;
s4, the electric telescopic rod (11) begins to extend after being contracted to the maximum degree, at the moment, the electric control valve (13) is opened, the gas between the piston plate a (12) and the piston plate b (16) can enter an external methane storage tank through the gas outlet pipe (14) and the vertical pipe b (8), and meanwhile, the elastic rod (15) gradually recovers;
s5, the piston plate b (16) moves downwards to be separated from the vertical pipe a (7), and the percolate in the vertical pipe a (7) flows into the main drainage pipe (4) and then is drained into a treatment tank through the main drainage pipe (4) for treatment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210313049.7A CN114669572B (en) | 2022-03-28 | 2022-03-28 | Leachate treatment device and treatment method for refuse landfill |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210313049.7A CN114669572B (en) | 2022-03-28 | 2022-03-28 | Leachate treatment device and treatment method for refuse landfill |
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| CN114669572A true CN114669572A (en) | 2022-06-28 |
| CN114669572B CN114669572B (en) | 2023-10-27 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115365282A (en) * | 2022-08-31 | 2022-11-22 | 银河航天(北京)网络技术有限公司 | Separate anti-seepage device for purifying agricultural contaminated soil |
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