CN110303022B - Anti-seepage pollution household garbage landfill system and method - Google Patents
Anti-seepage pollution household garbage landfill system and method Download PDFInfo
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- CN110303022B CN110303022B CN201910586645.0A CN201910586645A CN110303022B CN 110303022 B CN110303022 B CN 110303022B CN 201910586645 A CN201910586645 A CN 201910586645A CN 110303022 B CN110303022 B CN 110303022B
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- 239000010813 municipal solid waste Substances 0.000 title claims abstract description 39
- 238000000034 method Methods 0.000 title claims abstract description 19
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 76
- 238000002955 isolation Methods 0.000 claims abstract description 14
- 239000000203 mixture Substances 0.000 claims description 18
- 239000004744 fabric Substances 0.000 claims description 15
- 239000002893 slag Substances 0.000 claims description 13
- 239000002689 soil Substances 0.000 claims description 13
- 239000002245 particle Substances 0.000 claims description 12
- 230000002265 prevention Effects 0.000 claims description 11
- 238000002156 mixing Methods 0.000 claims description 9
- 239000010791 domestic waste Substances 0.000 claims description 8
- 230000008569 process Effects 0.000 claims description 7
- 239000004745 nonwoven fabric Substances 0.000 claims description 6
- 230000003044 adaptive effect Effects 0.000 claims description 5
- 238000007789 sealing Methods 0.000 claims description 5
- 238000011049 filling Methods 0.000 claims description 3
- 238000005429 filling process Methods 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- 239000012528 membrane Substances 0.000 claims description 3
- 238000001764 infiltration Methods 0.000 claims description 2
- 230000035515 penetration Effects 0.000 claims 1
- 239000002351 wastewater Substances 0.000 abstract description 20
- 239000002912 waste gas Substances 0.000 abstract description 17
- 239000002699 waste material Substances 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 4
- 239000007789 gas Substances 0.000 description 4
- 239000002352 surface water Substances 0.000 description 4
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000000354 decomposition reaction Methods 0.000 description 2
- 238000003912 environmental pollution Methods 0.000 description 2
- 239000003673 groundwater Substances 0.000 description 2
- 229910001385 heavy metal Inorganic materials 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 239000003570 air Substances 0.000 description 1
- 238000009264 composting Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000010865 sewage 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
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D31/00—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution
- E02D31/002—Ground foundation measures for protecting the soil or subsoil water, e.g. preventing or counteracting oil pollution
- E02D31/006—Sealing of existing landfills, e.g. using mining techniques
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- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention discloses a domestic garbage landfill system preventing permeation pollution, which comprises a landfill area and an isolation area, wherein the landfill area comprises a landfill pool, the outer side of the landfill pool is sequentially provided with an air guide layer, a permeation-preventing layer and a fixing layer, the air guide layer is arranged close to the landfill pool, the isolation area comprises a water guide layer arranged on the outer side of the fixing layer, the bottom of the air guide layer is provided with a drainage ditch, and the top of the air guide layer is connected with an exhaust pipe; the anti-seepage pollution household garbage landfill system and the method effectively isolate the waste water and the waste gas generated after the household garbage is filled, are convenient for collecting the waste water and the waste gas, and avoid the pollution to the environment after the garbage is filled.
Description
Technical Field
The invention belongs to the field of household garbage treatment, and particularly relates to a pollution-permeation-prevention household garbage landfill system and method.
Background
With the rapid development of social economy, the acceleration of urbanization process and the rapid improvement of the living standard of people in China, the domestic garbage generated in the urban production and living process is rapidly increased, and the conditions of land occupation, environmental pollution and the influence on the health of people of the domestic garbage are more obvious. The increasing of the amount of municipal domestic waste makes the waste treatment more and more difficult, and the problems of environmental pollution and the like caused by the increase gradually draw attention from all social circles. The national places high importance on the environmental protection problem, and the domestic garbage and sewage prevention and treatment work is greatly developed, however, while the urban garbage yield in China is continuously increased, the classification, recovery and treatment capacity of the domestic garbage and the horizontal development are relatively lagged, namely the domestic garbage treatment technology in China is very weak, so the applicability of the domestic garbage treatment technology becomes a very important problem for solving the domestic garbage. The treatment of domestic waste technology selection often becomes a difficult problem of municipal domestic waste treatment.
Municipal waste landfill is the most basic disposal method for municipal waste. Although municipal waste can be treated by incineration, composting or sorting, the remainder of the waste, which is difficult to treat, is subjected to final landfill treatment. The urban garbage is buried in the hollow areas, so that the waste can be disposed, the soil can be covered for land building, and the environment is protected.
In the prior art, after the domestic garbage is buried, a large amount of waste water and waste gas are generated in the process of decomposition along with the decomposition, a large amount of heavy metals or nitrogen are contained in the waste water and the waste gas, and the waste water and the waste gas need to be collected and treated by a subsequent process, otherwise, the waste water and the waste gas permeate to the underground along with the waste water, and the pollution range is enlarged.
Disclosure of Invention
The invention aims to provide a domestic garbage landfill system and a method for preventing permeation pollution, which can effectively isolate waste water and waste gas generated after the domestic garbage is filled, facilitate the collection of the waste water and the waste gas and avoid the pollution to the environment after the garbage is filled.
The anti-permeation pollution-prevention household garbage landfill system comprises a landfill area and an isolation area, wherein the landfill area comprises a landfill pool, an air guide layer, an anti-permeation layer and a fixing layer are sequentially arranged on the outer side of the landfill pool, the air guide layer is arranged close to the landfill pool, the isolation area comprises a water guide layer arranged on the outer side of the fixing layer, a drainage ditch is arranged at the bottom of the air guide layer, and an exhaust pipe is connected to the top of the air guide layer.
Preferably, the air guide layer comprises an upper air guide surface, a lower air guide surface and a side air guide surface, the upper air guide surface, the lower air guide surface and the side air guide surface realize the full-closed wrapping of the landfill pond, the anti-seepage layer comprises an upper anti-seepage surface, a lower anti-seepage surface and a side anti-seepage surface, the upper anti-seepage surface, the lower anti-seepage surface and the side anti-seepage surface realize the full-closed wrapping of the air guide layer, the drainage ditch is arranged on the upper part of the lower anti-seepage surface, and the fixing layer realizes the fixing of the anti-seepage layer.
Preferably, the water guide layer comprises an upper water guide surface, a lower water guide surface and a side water guide surface, and the water guide layer is used for fully sealing and wrapping the landfill area.
Preferably, the upper water guide surface and the lower water guide surface of the water guide layer are both arranged in a herringbone shape, and the side water guide surface extends to the lower part of the lower water guide surface.
Preferably, the material laid by the air guide layer is a mixture of slag and gravels after refuse incineration, the mixing ratio is 2:1, the particle size of the slag is 5-8 mm, the particle size of the gravels is 10-30 mm, the thickness of the gravels is 50-100 cm, the water guide layer is formed by mixing and laying fine gravels and coarse gravels, the mixing ratio is 2:1, the particle size of the fine gravels is 5-8 mm, the particle size of the coarse gravels is 10-30 mm, and the thickness of the coarse gravels is 50-100 cm.
Preferably, the permeation prevention layer is a permeation prevention film.
A household garbage landfill method for preventing seepage and pollution comprises the following steps:
1) building landfill pool
S1: selecting a site, namely selecting an area which is at least 10 kilometers away from a gathering place and a town of a residential area, wherein lakes and rivers are not arranged around the area, and an ecological protection area is not arranged;
s2: opening a foundation pit, and opening an operation foundation pit, wherein the depth and the cross-sectional area of the operation foundation pit are both larger than those of the isolation region, the side surface and the bottom surface of the foundation pit are both smooth, and soil generated by opening the foundation pit is transported to the vicinity of the foundation pit for later use;
s3: a water-guiding layer is built up,
1) building a side water guide surface, firstly, building a first side support of the side water guide surface, wherein the distance between the first side support and the side surface of the foundation pit is adaptive to the thickness of a water guide layer, then, paving a first net harmless cloth on the side surface of the foundation pit and the side support close to the side surface of the foundation pit, then, filling a mixture of fine gravel and coarse gravel into an area between the two opposite first net harmless cloths, and compacting the mixture of fine gravel and coarse gravel in the filling process;
2) building a water guide surface, firstly compacting the inner bottom surface of the foundation pit, paving a layer of grid non-woven fabric II on the inner bottom surface, and then paving and compacting a mixture of fine gravel and coarse gravel on the grid non-woven fabric II;
s4: building a landfill pool, and building a landfill pond,
s5: landfill, namely pouring the garbage to be buried into an area enclosed by the side air guide surface and the lower air guide surface of the air guide layer, and compacting;
s6: and sealing, and sequentially establishing an upper air guide surface, an exhaust pipe, an upper anti-seepage surface, an upper water guide surface, a soil layer and a vegetation layer from bottom to top on the upper part of the garbage buried and compacted in S5.
Preferably, a plurality of U-shaped grooves are uniformly distributed on the upper surface of the bottom surface of the fixed layer, and the drainage ditch is arranged in the U-shaped grooves.
The technical scheme of the invention has the beneficial effects that:
according to the household garbage landfill system with the anti-seepage pollution function, the isolation of the landfill pool and the external environment is effectively realized, the phenomenon that waste water and waste gas generated by the decay of the household garbage after landfill penetrate into the external area of the landfill pool is avoided, and the pollution to the ground surface outside the landfill pool, the underground environment and the like is avoided.
The anti-seepage pollution household garbage landfill method has the advantages of simple operation, low cost, large amount of garbage in one-time landfill and high efficiency.
Drawings
FIG. 1 is a schematic view of an anti-infiltration pollution-prevention domestic waste landfill system according to the technical scheme of the invention,
FIG. 2 is a schematic view of a drain.
Detailed Description
In order to facilitate the understanding of the technical solutions of the present invention for those skilled in the art, the technical solutions of the present invention will be further described with reference to the drawings attached to the specification.
As shown in fig. 1, a domestic waste landfill system that prevention of seepage was passed through and is polluted, including landfill district and isolation region, the landfill district includes landfill pond 7, and the landfill pond 7 outside has set gradually and has led gas layer 6, prevention of seepage permeable layer 5 and fixed bed 4, and gas layer 6 is close to the landfill pond setting, and the isolation region is including setting up the water guide layer 3 in the fixed bed 4 outside, and 5 bottoms on gas guide layer are provided with escape canal 2, and 6 tops on gas guide layer are connected with blast pipe 9.
Based on above-mentioned technical scheme, the domestic waste of landfill in the landfill pond 7, can decay behind the domestic waste landfill and produce a large amount of waste water and waste gas, and air guide layer 6 is because there are a lot of gaps in its structure, be convenient for carry out the air guide and lead waste water, the realization is discharged waste water and waste gas (the principal ingredients is methane) that the rubbish corruption produced fast, avoid a large amount of waste gas to stop in landfill pond 7, avoid landfill pond 7 to explode, and contain a large amount of heavy metals in the waste water that produces, collect and handle waste water, avoid causing secondary pollution to the environment, especially avoid causing the pollution to groundwater or surface water in the environment.
Based on the technical scheme, the design of the water guide layer 3 effectively prevents the underground water or surface water in the external environment of the landfill pool 7 from entering the landfill pool 7, reduces the pressure of the impermeable layer, and simultaneously influences of the underground water or the surface water on the surrounding environment of the landfill pool 7, such as collision, flushing and the like on the surrounding environment.
As shown in fig. 1, the air guiding layer 6 comprises an upper air guiding surface, a lower air guiding surface and a side air guiding surface, the upper air guiding surface, the lower air guiding surface and the side air guiding surface realize the totally-enclosed wrapping of the landfill tank 7, the anti-permeation layer 5 comprises an upper anti-permeation surface, a lower anti-permeation surface and a side anti-permeation surface, the upper anti-permeation surface, the lower anti-permeation surface and the side anti-permeation surface realize the totally-enclosed wrapping of the air guiding layer 6, the drainage ditch 2 is arranged at the upper part of the lower anti-permeation surface, and the fixing layer 4 realizes the fixing of the anti-permeation layer 5; through the technology, the landfill tank 7 is a totally-enclosed area, so that waste water and waste gas can be conveniently collected, and the waste water and waste gas can be prevented from being leaked.
As shown in fig. 1, the water guiding layer 3 comprises an upper water guiding surface 8, a lower water guiding surface 10 and a side water guiding surface 11, the water guiding layer 3 realizes the totally-enclosed wrapping of the landfill area, the upper water guiding surface 8 and the lower water guiding surface 10 of the water guiding layer 3 are both arranged in a herringbone shape, and the side water guiding surface 11 extends to the lower position of the lower water guiding surface 10; the design of water guide layer 3 has effectually obstructed outside surface water and groundwater and has got into landfill pond 7, goes up the effectual realization of the design of water guide surface 8, lower water guide surface 10 and side water guide surface 11 and in 7 quick row's of water guide layer 3 outside regions of landfill pond all around, avoids causing the influence to landfill pond 7.
The material laid by the air guide layer 6 is a mixture of slag and gravels after refuse incineration, the mixing ratio is 2:1, the particle size of the slag is 5-8 mm, the particle size of the gravels is 10-30 mm, the thickness of the gravels is 50-100 cm, the water guide layer 3 is formed by mixing and laying fine gravels and coarse gravels, the mixing ratio is 2:1, the particle size of the fine gravels is 5-8 mm, the particle size of the coarse gravels is 10-30 mm, and the thickness of the coarse gravels is 50-100 cm; the air guide layer effectively solves the problem of partial slag rubbish, simultaneously meets the problem that a certain gap or clearance is formed inside the air guide layer 6 and the water guide layer 3, and is beneficial to the flow of water and air.
The anti-seepage layer is an anti-seepage film, the anti-seepage film is an isolation film, water vapor is effectively isolated, waste water and waste gas are prevented from permeating, and the waste water and the waste gas are prevented from influencing the isolation region.
A household garbage landfill method for preventing seepage and pollution comprises the following steps:
1) building landfill pool
S1: selecting a site, namely selecting an area which is at least 10 kilometers away from a gathering place and a town of a residential area, wherein lakes and rivers are not arranged around the area, and an ecological protection area is not arranged; the secondary pollution to the environment is effectively avoided, and particularly, in landfill, the garbage is decomposed in the air to generate a large amount of waste gas, so that peculiar smell is generated, and the normal life and work of people are influenced;
s2: opening a foundation pit, and opening an operation foundation pit, wherein the depth and the cross-sectional area of the operation foundation pit are both larger than those of the isolation region, the side surface and the bottom surface of the foundation pit are both smooth, and soil generated by opening the foundation pit is transported to the vicinity of the foundation pit for later use;
s3: a water-guiding layer is built up,
1) building a side water guide surface, firstly, building a first side support of the side water guide surface, wherein the distance between the first side support and the side surface of the foundation pit is adaptive to the thickness of a water guide layer, then, paving a first net harmless cloth on the side surface of the foundation pit and the side support close to the side surface of the foundation pit, then, filling a mixture of fine gravel and coarse gravel into an area between the two opposite first net harmless cloths, and compacting the mixture of fine gravel and coarse gravel in the filling process;
2) building a water guide surface, firstly compacting the inner bottom surface of the foundation pit, paving a layer of grid non-woven fabric II on the inner bottom surface, and then paving and compacting a mixture of fine gravel and coarse gravel on the grid non-woven fabric II;
s4: building a landfill pool, and building a landfill pond,
s5: landfill, namely pouring the garbage to be buried into an area enclosed by the side air guide surface and the lower air guide surface of the air guide layer, and compacting;
s6: and sealing, and sequentially establishing an upper air guide surface, an exhaust pipe, an upper anti-seepage surface, an upper water guide surface, a soil layer and a vegetation layer from bottom to top on the upper part of the garbage buried and compacted in S5.
A plurality of U-shaped grooves are uniformly distributed on the upper surface of the bottom surface of the fixed layer, and the drainage ditches are arranged in the U-shaped grooves; the U-shaped groove is convenient for wastewater to flow and collect.
Technical solution of the invention is described above with reference to the accompanying drawings, it is obvious that the specific implementation of the invention is not limited by the above-mentioned manner, and it is within the scope of the invention to adopt various insubstantial modifications of the inventive method concept and technical solution, or to apply the inventive concept and technical solution to other occasions without modification.
Claims (4)
1. The anti-permeation pollution household garbage landfill system is characterized by comprising a landfill area and an isolation area, wherein the landfill area comprises a landfill pool, an air guide layer, an anti-permeation layer and a fixing layer are sequentially arranged on the outer side of the landfill pool, the air guide layer is arranged close to the landfill pool, the isolation area comprises a water guide layer arranged on the outer side of the fixing layer, a drainage ditch is arranged at the bottom of the air guide layer, an exhaust pipe is connected to the top of the air guide layer,
the air guide layer comprises an upper air guide surface, a lower air guide surface and a side air guide surface, the upper air guide surface, the lower air guide surface and the side air guide surface realize the full-closed wrapping of the landfill pond, the anti-seepage layer comprises an upper anti-seepage surface, a lower anti-seepage surface and a side anti-seepage surface, the upper anti-seepage surface, the lower anti-seepage surface and the side anti-seepage surface realize the full-closed wrapping of the air guide layer, the drainage ditch is arranged at the upper part of the lower anti-seepage surface, and the fixing layer realizes the fixing of the anti-seepage layer;
the water guide layer comprises an upper water guide surface, a lower water guide surface and a side water guide surface, and the water guide layer is used for fully sealing and wrapping the landfill area;
the upper water guide surface and the lower water guide surface of the water guide layer are both arranged in a herringbone shape, and the side water guide surface extends to the lower part of the lower water guide surface;
the material laid by the air guide layer is a mixture of slag and gravels after refuse incineration, the mixing ratio is 2:1, the particle size of the slag is 5-8 mm, the particle size of the gravels is 10-30 mm, the thickness of the gravels is 50-100 cm, the water guide layer is formed by mixing and laying fine gravels and coarse gravels, the mixing ratio is 2:1, the particle size of the fine gravels is 5-8 mm, the particle size of the coarse gravels is 10-30 mm, and the thickness of the coarse gravels is 50-100 cm.
2. The landfill system according to claim 1, wherein the permeation prevention layer is a permeation prevention film.
3. A landfill method based on the pollution penetration prevention domestic waste landfill system of any one of claims 1 or 2, characterized by comprising the steps of:
1) building landfill pool
S1: selecting a site, namely selecting an area which is at least 10 kilometers away from a gathering place and a town of a residential area, wherein lakes and rivers are not arranged around the area, and an ecological protection area is not arranged;
s2: opening a foundation pit, and opening an operation foundation pit, wherein the depth and the cross-sectional area of the operation foundation pit are both larger than those of the isolation region, the side surface and the bottom surface of the foundation pit are both smooth, and soil generated by opening the foundation pit is transported to the vicinity of the foundation pit for later use;
s3: a water-guiding layer is built up,
1) building a side water guide surface, firstly, building a first side support of the side water guide surface, wherein the distance between the first side support and the side surface of the foundation pit is adaptive to the thickness of a water guide layer, then, paving a first net harmless cloth on the side surface of the foundation pit and the side support close to the side surface of the foundation pit, then, filling a mixture of fine gravel and coarse gravel into an area between the two opposite first net harmless cloths, and compacting the mixture of fine gravel and coarse gravel in the filling process;
2) building a water guide surface, firstly compacting the inner bottom surface of the foundation pit, paving a layer of grid non-woven fabric II on the inner bottom surface, and then paving and compacting a mixture of fine gravel and coarse gravel on the grid non-woven fabric II;
s4: building a landfill pool, and building a landfill pond,
s5: landfill, namely pouring the garbage to be buried into an area enclosed by the side air guide surface and the lower air guide surface of the air guide layer, and compacting;
s6: and sealing, and sequentially establishing an upper air guide surface, an exhaust pipe, an upper anti-seepage surface, an upper water guide surface, a soil layer and a vegetation layer from bottom to top on the upper part of the garbage buried and compacted in S5.
4. The landfill method of the anti-infiltration pollution-prevention household garbage landfill system according to claim 3, wherein a plurality of U-shaped grooves are uniformly distributed on the upper surface of the bottom surface of the fixed layer, and the drainage ditches are arranged in the U-shaped grooves.
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|---|---|---|---|---|
| CN104324925A (en) * | 2014-09-09 | 2015-02-04 | 中国科学院南京土壤研究所 | Domestic garbage landfill final cover system |
| CN205530203U (en) * | 2015-12-16 | 2016-08-31 | 北京高能时代环境技术股份有限公司 | Domestic waste landfill yard closes structure for wastes material is sharp |
| CN207521413U (en) * | 2017-11-13 | 2018-06-22 | 无锡市固废环保处置有限公司 | A kind of security landfill field of hazardous waste |
| CN109047267A (en) * | 2018-09-27 | 2018-12-21 | 苏州金螳螂园林绿化景观有限公司 | Degeneration system is polluted in refuse landfill |
| CN109570181A (en) * | 2018-11-29 | 2019-04-05 | 焦钰 | A kind of Combined garbage Closure of landfill site system |
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2019
- 2019-07-01 CN CN201910586645.0A patent/CN110303022B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104324925A (en) * | 2014-09-09 | 2015-02-04 | 中国科学院南京土壤研究所 | Domestic garbage landfill final cover system |
| CN205530203U (en) * | 2015-12-16 | 2016-08-31 | 北京高能时代环境技术股份有限公司 | Domestic waste landfill yard closes structure for wastes material is sharp |
| CN207521413U (en) * | 2017-11-13 | 2018-06-22 | 无锡市固废环保处置有限公司 | A kind of security landfill field of hazardous waste |
| CN109047267A (en) * | 2018-09-27 | 2018-12-21 | 苏州金螳螂园林绿化景观有限公司 | Degeneration system is polluted in refuse landfill |
| CN109570181A (en) * | 2018-11-29 | 2019-04-05 | 焦钰 | A kind of Combined garbage Closure of landfill site system |
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Denomination of invention: A domestic waste landfill system and method for preventing infiltration pollution Granted publication date: 20211022 Pledgee: Hefei high tech Company limited by guarantee Pledgor: Anhui Yiersi Environmental Technology Co.,Ltd. Registration number: Y2024980027819 |
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