Water and gas guiding method for refuse landfill and application of water and gas guiding method

Abstract

The invention provides a water and gas guiding method for a refuse landfill and application of the water and gas guiding method. According to the water and gas guiding method, water and gas are guided through a guiding and discharging pipe arranged on the working face of the refuse landfill, so that the blocking effect of garbage such as plastic on landfill leachate and landfill gas can be reduced; water and gas are uniformly and fully guided for the garbage heap at the working face, complex arrangement of a pumping and discharging vertical shaft and the like in the prior art can be avoided, separation and collection of the landfill leachate and the landfill gas can be achieved through the guiding and discharging pipe, and the device has the advantages of being low in cost, convenient to apply and popularize and the like.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of landfill operation, in particular to a landfill water and gas guiding method and application thereof. BACKGROUND

[0002] At present, the garbage in many simple landfills has been stacked for a long time, exceeding the designed service life. Moreover, in the design process of early landfills, on the one hand, no strict investigation and planning is made according to the local environmental conditions, geological conditions and the like, and on the other hand, the anti-seepage measures of the landfill are not perfect in the design, which deepens the pollution degree of the landfill and leaves a major safety hazard for people's daily life and operation management.

[0003] With the development of urban and rural construction in China, the urban area is continuously expanding, and the demand for building land is increasing dramatically. With the increasing shortage of building land, some early landfills are gradually included in the scope of urban construction planning land. Therefore, in recent years, the re-development of landfill sites has become a hot topic, and there are engineering examples of building on landfills at home and abroad. Landfills not only occupy a large amount of land resources, but also cause the emission of methane, carbon dioxide and other harmful gases, and produce leachate pollution of groundwater. With the increasing contradiction between safety risks and land shortage, the re-development and utilization of landfills has become a focus of attention, and the excavation and reconstruction of landfills have also been put on the agenda. In addition, for some normally operating landfills, water and gas guiding is also needed to clean up leachate and landfill gas in time to avoid local slippage, cracks and other hazards in the garbage pile.

[0004] At present, the mainstream technology of landfill water and gas guiding is mainly combined with "active drainage + passive collection", and a drainage system is constructed for leachate (water guiding) and landfill gas (gas guiding) respectively. The water guiding system mostly adopts the combined structure of "geotextile + collection flower pipe + gravel drainage layer", the leachate is filtered through the geotextile and then flows into the HDPE porous flower pipe through the gravel gap, and finally flows into the collection tank; the gas guiding system takes the gas guiding well as the core, and through the arrangement of the HDPE porous flower pipe in the landfill pile, the surrounding is filled with gravel to form an air passage, and then the gas is collected by the gas collection pipe network and transported to the flare incineration or subsequent treatment device by the negative pressure equipment. The regular landfill is considered to have been equipped with basic drainage facilities during construction, and before excavation, the "original system repair + supplementary encryption" mode is mostly used, such as increasing the density of gas guiding wells and replacing damaged flower pipes; while the early non-regular landfill generally lacks anti-seepage and drainage systems, and a simple drainage network needs to be temporarily constructed before excavation, such as surface excavation of seepage ditches and temporary gas guiding pipes, to reduce the water content and gas pressure of the pile.

[0005] However, the current water and gas guiding method still has the following defects: 1. The guiding and draining channel is easy to be blocked and fail. The traditional guiding and draining layer relies on gravel or small-pore three-dimensional drainage network. The impurities in the landfill gas and the suspended solids in the leachate are easy to be adsorbed and blocked in the pores. The uneven settlement of the heap body will cause the bending of the flower pipe and the deformation of the guiding and draining layer, which will greatly reduce the efficiency of gas and water guiding, and even completely fail. 2. The guiding and draining precision and coverage are insufficient. The non-standard landfill site lacks basic data, and the gas guiding well and the flower pipe are mostly laid according to experience, which is difficult to accurately match the landfill gas enrichment area and the leachate accumulation area, resulting in excessive gas pressure in local area and failure to drain leachate, which leaves hidden dangers of collapse and explosion for excavation construction. 3. The system has poor adaptability and stability. The existing technology has poor adaptability to landfill sites with different mineralization degrees and heap heights. For example, the high heap landfill site is easy to cause the rupture of the guiding and draining pipe due to the self-weight pressure, and the low temperature environment in the north will cause the leachate to freeze and block the guiding and draining channel. Moreover, the components of the system are mostly connected by bundling, which is easy to cause interface loosening and channel rupture after settlement. 4. The guiding and draining and excavation have weak coordination. The water and gas guiding is mostly an independent pre-process before excavation, and lacks dynamic linkage design with the excavation progress. When new gas or leachate enrichment area is exposed by excavation, temporary supplement of guiding and draining facilities will delay the construction period, and the traditional system is difficult to realize real-time monitoring of gas concentration and leachate level and dynamic adjustment of guiding and draining intensity.

[0006] Therefore, it is necessary to develop a landfill site water and gas guiding method and its application. SUMMARY

[0007] In view of the problems in the prior art, the present application provides a landfill site water and gas guiding method and its application. The water and gas guiding method is performed by the guiding and draining pipe arranged on the working face of the landfill site, which can reduce the blocking effect of plastic and other garbage on landfill leachate and landfill gas, uniformly and fully guide water and gas to the working face of the garbage heap, and avoid the complex setting of the existing technology such as the extraction and drainage shaft. The separation and collection of landfill leachate and landfill gas can be realized by the guiding and draining pipe, which has the advantages of low cost, easy popularization and application, etc.

[0008] To achieve this purpose, the following technical solutions are adopted in the present application:

[0009] One of the purposes of the present application is to provide a landfill site water and gas guiding method, which comprises the following steps:

[0010] (1) determining the working face of the landfill site which needs to be guided by water and gas;

[0011] (2) excavating a plurality of guiding and draining blind trenches with a depth of 10-15 meters along the strike of the working face;

[0012] Case a: at least two guiding and draining pipes are arranged along the vertical direction in all the guiding and draining blind trenches;

[0013] Case b: according to the alternation principle, the blind drainage ditch is divided into an air extraction blind drainage ditch and an air blowing blind drainage ditch, and at least two drainage pipes and at least two air blowing pipes are independently arranged in the vertical direction in the respective blind drainage ditch;

[0014] Wherein, the direction of each of the drainage pipes or the air blowing pipes is independently parallel to the direction of the blind drainage ditch; each of the drainage pipes or the air blowing pipes is independently provided with holes on the surface and a switch valve at the end; all the drainage pipes are collected on a drainage main pipe which is provided with a drainage pump and a gas-liquid separator in sequence; for each of the blind drainage ditches, the arrangement is achieved by filling with stones, and a separation layer is covered on the surface.

[0015] (3) The drainage pipes collect the landfill gas and the leachate, and the gas-liquid separator separates and collects the water and the gas, thereby guiding the water and the gas on the working surface.

[0016] As a preferred technical solution of the present application, in step (2), the width of the blind drainage ditch is 0.4-1.0 meters.

[0017] As a preferred technical solution of the present application, in step (2), the blind drainage ditches are arranged in parallel or in a grid shape, and the horizontal distance between two adjacent blind drainage ditches is 15-20 meters.

[0018] As a preferred technical solution of the present application, in step (2), in the same blind drainage ditch, the vertical distance between two adjacent drainage pipes or two adjacent air blowing pipes is 2-5 meters.

[0019] As a preferred technical solution of the present application, in step (2), the diameter of the holes is 5-15 mm.

[0020] As a preferred technical solution of the present application, in step (2), the average particle size of the stones is 20-50 mm.

[0021] As a preferred technical solution of the present application, in step (2), the separation layer comprises: backfilling and compacting each of the blind drainage ditches with soil and / or landfill.

[0022] As a preferred technical solution of the present application, in step (2), the thickness of the separation layer is 1-2 meters.

[0023] The second object of the present application is to provide an application of the waste landfill site water and gas guiding method, the waste landfill site water and gas guiding method of the first object is used to guide water and gas of the working face of the waste landfill site, until the water content of the drained garbage is less than 30%, and the excavation operation is performed; the cycle operation of the water and gas guiding-excavation is repeated, and the waste landfill site is peeled and excavated from the surface to the inside.

[0024] The third object of the present application is to provide an application of the waste landfill site water and gas guiding method, the waste landfill site water and gas guiding method of the first object is used to guide water and gas of the working face of the waste landfill site, and the stack topography of the waste landfill site is maintained, so that the local slip and crack and other dangerous situations are avoided.

[0025] Compared with the prior art, the present application has at least the following beneficial effects:

[0026] (1) The water and gas guiding method is used for guiding water and gas through the drainage pipe arranged on the working face of the waste landfill site, which can reduce the blocking effect of plastic and other garbage on the landfill leachate and landfill gas, uniformly and fully guide water and gas of the garbage stack at the working face, and avoid the complex setting of the drainage shaft in the prior art, so that the separation and collection of the landfill leachate and the landfill gas can be realized through the drainage pipe, and the method has the advantages of low cost, easy popularization and application, etc.

[0027] (2) The water and gas guiding method can be applied before excavation, the water content of the drained garbage corresponding to the working face is less than 30%, the excavation operation is performed, the cycle operation of the water and gas guiding-excavation is repeated, the waste landfill site is peeled and excavated from the surface to the inside, and the method is especially suitable for the waste landfill site with a stack height of 60-80 meters, so that the excavation difficulty and cost can be effectively reduced.

[0028] (3) The water and gas guiding method can be applied in the normal operation process of the waste landfill site, the stack topography of the waste landfill site is maintained, and the local slip and crack and other dangerous situations are avoided. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 is a schematic view of the grid distribution of the drainage blind ditch in the water and gas guiding method of the present application embodiment 1.

[0030] Figure 2 is a top view of Figure 1 .

[0031] Figure 3 is a sectional view of A-A in Figure 2 .

[0032] In the figure: 1-garbage stack; 2-drainage blind ditch; 3-isolation layer; 4-drainage pipe. DETAILED DESCRIPTION

[0033] The technical solutions of the present application are further illustrated by the specific embodiments below.

[0034] One specific embodiment of the present application provides a landfill water and gas guiding method, which comprises the following steps:

[0035] (1) determining a working face of a landfill that needs water and gas guiding;

[0036] (2) excavating a plurality of blind drainage ditches with a depth of 10-15 meters along the strike of the working face;

[0037] Case a: in all the blind drainage ditches, at least two vertical drainage pipes are arranged;

[0038] Case b: according to the alternating principle, the blind drainage ditches are divided into air extraction blind drainage ditches and air blowing blind drainage ditches, and at least two vertical drainage pipes and at least two air blowing pipes are independently arranged in each blind drainage ditch along the vertical direction;

[0039] wherein, the strike of each drainage pipe or air blowing pipe is independently parallel to the strike of the blind drainage ditch; each drainage pipe or air blowing pipe independently has holes on the surface and a switch valve at the end; all the drainage pipes are collected on a drainage main pipe which is sequentially provided with a drainage pump and a gas-liquid separator; for each blind drainage ditch, the arrangement is filled with stones and a separation layer is covered on the surface.

[0040] (3) collecting landfill leachate and landfill gas through the drainage pipes, and separating and collecting the landfill leachate and landfill gas through the gas-liquid separator to guide water and gas for the working face.

[0041] The water and gas guiding method in the prior art is mainly based on the drainage of extraction shafts. On the one hand, since the plastic and other garbage in the garbage pile can block the diffusion of landfill leachate and landfill gas to the extraction shaft, it forms an accumulation in the local area at different heights and different positions of the garbage pile, which greatly reduces the drainage efficiency. On the other hand, the height of the existing garbage pile often reaches 60-80 meters, and the topography is complex, so it is very difficult to drill the extraction shaft. Therefore, the water and gas guiding method of the present application can guide water and gas through the drainage pipes arranged on the working face of the landfill, which can not only reduce the blocking effect of plastic and other garbage on landfill leachate and landfill gas, but also uniformly and fully guide water and gas for the working face of the garbage pile, and avoid the complex arrangement of the extraction shaft in the prior art. Through the drainage pipes, the separation and collection of landfill leachate and landfill gas can be achieved, which has the advantages of low cost, easy popularization and application, etc.

[0042] It should be noted that the case a of the present application mainly conducts non-discriminatory drainage on the working face, so that the drainage pipe in each drainage blind ditch can conduct water and gas to the garbage heap on both sides. The case b of the present application is arranged according to the alternating principle, and the air exhaust drainage blind ditch with the drainage pipe and the air blowing drainage blind ditch with the air blowing pipe can diffuse the garbage leachate and the garbage landfill gas to the drainage pipe while the drainage pipe conducts water and gas to the garbage heap on both sides, so as to accelerate the diffusion and improve the water and gas conducting efficiency. Moreover, the air blown into the air blowing pipe can increase the oxygen content in the garbage heap corresponding to the working face, change the anaerobic environment into aerobic environment, which is helpful to the decomposition of the garbage heap by the thermophilic bacteria and quickly reduces the water content of the garbage heap. It should be noted that the air blowing of the air blowing pipe belongs to the prior art, and the present application will not be described again.

[0043] Optionally, step (1) further includes surveying and detecting, such as hazard identification and hazard treatment, which is helpful to determine the working face that needs to be conducted water and gas.

[0044] Optionally, in step (2), the depth of the drainage blind ditch is 10-15 meters, such as 10 meters, 11 meters, 12 meters, 13 meters, 14 meters or 15 meters, but not limited to the listed values, and other values not listed in the above value range are also applicable.

[0045] Optionally, in step (2), the width of the drainage blind ditch is 0.4-1.0 meters, such as 0.4 meters, 0.5 meters, 0.6 meters, 0.7 meters, 0.8 meters, 0.9 meters or 1.0 meters, but not limited to the listed values, and other values not listed in the above value range are also applicable.

[0046] Optionally, in step (2), the drainage blind ditches are in parallel distribution or in grid distribution, and the horizontal distance between two adjacent drainage blind ditches is 15-20 meters, such as 15 meters, 16 meters, 17 meters, 18 meters, 19 meters or 20 meters, but not limited to the listed values, and other values not listed in the above value range are also applicable.

[0047] Optionally, in step (2), in the same drainage blind ditch, the vertical distance between two adjacent drainage pipes or two adjacent air blowing pipes is 2-5 meters, such as 2 meters, 2.5 meters, 3 meters, 3.5 meters, 4 meters, 4.5 meters or 5 meters, but not limited to the listed values, and other values not listed in the above value range are also applicable.

[0048] It should be noted that the vertical distance between two adjacent drainage pipes or two adjacent air blowing pipes in the water and gas conducting method of the present application is preferably 2-5 meters, and the vertical distance greater than 5 meters is also within the protection scope of the present application due to the limitation of site conditions.

[0049] Optionally, in step (2), the diameter of the hole is 5-15 mm, for example, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, 11 mm, 12 mm, 13 mm, 14 mm or 15 mm, but not only limited to the listed values, other values not listed in the above numerical range are also applicable.

[0050] Optionally, in step (2), the average particle size of the stone is 20-50 mm, for example, 20 mm, 25 mm, 30 mm, 35 mm, 40 mm, 45 mm or 50 mm, but not only limited to the listed values, other values not listed in the above numerical range are also applicable.

[0051] Optionally, in step (2), the isolation layer comprises: backfilling and compacting each of the drainage blind trenches with soil and / or landfill waste.

[0052] Optionally, in step (2), the thickness of the isolation layer is 1-2 meters, for example, 1 meter, 1.1 meters, 1.3 meters, 1.5 meters, 1.7 meters, 1.8 meters or 2 meters, but not only limited to the listed values, other values not listed in the above numerical range are also applicable.

[0053] Another embodiment of the present application provides an application of a landfill water and gas guiding method, which uses the landfill water and gas guiding method of the aforementioned one embodiment to guide water and gas on the working face of the landfill until the water content of the waste after drainage is <30%, and then excavate; repeat the cycle of the aforementioned water and gas guiding-excavation to realize the stripping excavation of the landfill from the surface to the inside.

[0054] Another embodiment of the present application provides an application of a landfill water and gas guiding method, which uses the landfill water and gas guiding method of the aforementioned one embodiment to guide water and gas on the working face of the landfill to maintain the heap morphology of the landfill and avoid local slip and crack.

[0055] It should be noted that when the water and gas guiding method of the present application is used to maintain the heap morphology of the landfill, the areas with characteristics such as bulging, water content >40% and large cracks are detected, which helps to determine the working face that needs to be guided, for example, a drainage blind trench can be formed based on a large crack.

[0056] To better illustrate the present application and facilitate understanding of the technical solutions of the present application, the typical but non-limiting embodiments of the present application are as follows in combination with the drawings:

[0057] Example 1

[0058] A garbage landfill site in a city is located in the catchment area upstream of the main drinking water source Shiyuan Reservoir, which is a typical valley type without artificial anti-seepage simple stacking site. The landfill site covers an area of 82338 square meters, the reservoir area is 55000 square meters, the height of the garbage pile is about 80 meters, and the volume is about 800000 cubic meters. However, the environmental pollution problem of the garbage landfill site is relatively serious, and the city hopes to excavate the garbage landfill site and release the area as new construction land.

[0059] To this end, the embodiment provides a garbage landfill site water and gas guide method and application thereof, as shown in the figure, the garbage landfill site water and gas guide method is arranged according to condition a, which comprises: Figures 1-3 The entire surface of the garbage landfill site is used as a working surface, and a plurality of depth 10-meter blind drainage ditches 2 are excavated downward along the strike of the working surface. Two drainage pipes 4 are erected in each blind drainage ditch 2 along the vertical direction. For each blind drainage ditch 2, stone is filled to achieve the erection of the drainage pipe 4, and a barrier layer 3 is covered on the surface. The garbage leachate and landfill gas are collected through the drainage pipe 4 to guide water and gas on the working surface. After the drainage, the water content of the garbage is less than 30%, and the garbage corresponding to the working surface is excavated. The periodic operation of the foregoing water and gas guide-excavation is repeated to realize the stripping excavation of the garbage landfill site from the surface to the inside.

[0060] The garbage landfill site water and gas guide method in the embodiment comprises the following steps:

[0061] (1) Determine the working surface of the garbage landfill site that needs to be guided for water and gas, and use the entire surface of the garbage landfill site as the working surface;

[0062] (2) Along the strike of the working surface, a plurality of depth 10-meter blind drainage ditches are excavated downward by a long-arm excavator. The width of each blind drainage ditch is 0.8 meters, and the blind drainage ditches are distributed in a grid shape. The horizontal distance between two adjacent blind drainage ditches is 15 meters. According to condition a, two drainage pipes are erected in the vertical direction in all blind drainage ditches;

[0063] Each blind drainage ditch is filled with stone to achieve the erection of the drainage pipe, and a barrier layer is covered on the surface. The garbage leachate and landfill gas are collected through the drainage pipe to guide water and gas on the working surface. After the drainage, the water content of the garbage is less than 30%, and the garbage corresponding to the working surface is excavated. The periodic operation of the foregoing water and gas guide-excavation is repeated to realize the stripping excavation of the garbage landfill site from the surface to the inside.

[0064] In the same guide and drain blind ditch, one guide and drain pipe is placed at the bottom, 5-meter-thick stone is filled, then another guide and drain pipe is placed, 3-meter-thick stone is filled, then 2-meter-thick original garbage of the landfill is backfilled to form a separation layer, preventing the landfill gas from overflowing from the top of the guide and drain blind ditch; the hole diameter of each guide and drain pipe is 10mm, and the average particle size of the filled stone is 30mm;

[0065] (3) Collecting the landfill leachate and the landfill gas through the guide and drain pipe, and separating and collecting through the gas-liquid separator to guide the water and the gas.

[0066] By using about 1 year and 8 months, about 100,000 tons of landfill leachate is mined, and the mined landfill gas is purified and then enters the biogas power generation system, about 800,000 cubic meters of stockpiled garbage is reused, and 8.2338 thousand square meters of construction land is newly added. Not only can the problems such as pollution, screening material outlet and soil and groundwater environment remediation in the mining process be solved, but also economic benefits such as garbage product sales and land development income can be generated.

[0067] In summary, the water and gas guiding method can guide the water and the gas through the guide and drain pipe arranged on the working face of the landfill, can reduce the blocking effect of the plastic and other garbage on the landfill leachate and the landfill gas, can uniformly and fully guide the water and the gas to the garbage heap at the working face, can avoid the complex setting of the existing technology such as the pumping shaft, can separate and collect the landfill leachate and the landfill gas through the guide and drain pipe, and has the advantages of low cost, easy popularization and application and the like.

[0068] In addition, the water and gas guiding method can be applied before excavation, the water content of the garbage corresponding to the guide and drain after the working face is less than 30%, the excavation operation is performed, the cycle operation of water and gas guiding-excavation is repeated, the strip excavation from the surface to the inside of the landfill is realized, and the method is especially suitable for the landfill with a heap height of 60-80 meters, can effectively reduce the excavation difficulty and the excavation cost. The water and gas guiding method can also be applied in the normal operation process of the landfill, the heap appearance of the landfill can be maintained, and the danger such as local sliding and crack can be avoided.

[0069] The above embodiments are used to illustrate the detailed structural features of the present application, but the present application is not limited to the above detailed structural features, that is, the present application does not mean that the present application must rely on the above detailed structural features to be implemented. Those skilled in the art should understand that any improvement of the present application, equivalent replacement of the components selected by the present application, increase of auxiliary components, selection of specific modes and the like all fall within the protection scope and disclosure scope of the present application.

[0070] The preferred embodiments of the present application are described in detail above, but the present application is not limited to the specific details of the above-described embodiments, and various simple modifications can be made to the technical solutions of the present application within the technical concept of the present application, and these simple modifications all belong to the protection scope of the present application.

[0071] In addition, it should be noted that each specific technical feature described in the above specific embodiments can be combined in any appropriate manner without contradiction, and in order to avoid unnecessary repetition, the present application will not further describe various possible combinations.

[0072] In addition, various different embodiments of the present application can also be combined in any manner, as long as it does not deviate from the idea of the present application, and it should also be considered as disclosed by the present application.

Claims

1. A method of constructing a landfill gas and water barrier comprising: The landfill water and gas guiding method comprises the following steps: (1) determining a working surface of the landfill requiring water and gas guiding; (2) excavating a plurality of blind drainage ditches with a depth of 10-15 meters along the strike of the working surface; Case a: erecting at least two vertical drainage pipes in all the blind drainage ditches; Case b: according to the alternating principle, the blind drainage ditches are divided into air extraction blind drainage ditches and air blowing blind drainage ditches, and at least two vertical drainage pipes and at least two air blowing pipes are independently erected in each blind drainage ditch, respectively; wherein the strike of each drainage pipe or air blowing pipe is parallel to the strike of the blind drainage ditch in which it is located; each drainage pipe or air blowing pipe is independently provided with holes on the surface and a switch valve at the end; all the drainage pipes are collected on a drainage main pipe which is sequentially provided with a drainage pump and a gas-liquid separator; for each blind drainage ditch, the erection is achieved by filling with stones, and a separation layer is covered on the surface; (3) collecting landfill leachate and landfill gas through the drainage pipes, and separating and collecting the landfill leachate and landfill gas through the gas-liquid separator to guide water and gas for the working surface.

2. The landfill gas and water migration method of claim 1, wherein, In step (2), the width of the blind drainage ditch is 0.4-1.0 meters.

3. The landfill gas and water migration method of claim 1, wherein, In step (2), the blind drainage ditches are in parallel distribution or in grid distribution, and the horizontal distance between two adjacent blind drainage ditches is 15-20 meters.

4. The landfill gas and water migration method of claim 1, wherein, In step (2), in the same blind drainage ditch, the vertical distance between two adjacent drainage pipes or two adjacent air blowing pipes is 2-5 meters.

5. The landfill gas and water migration method of claim 1, wherein, In step (2), the diameter of the hole is 5-15 mm.

6. The landfill gas and water migration method of claim 1, wherein, In step (2), the average particle size of the stone is 20-50 mm.

7. The landfill gas and water migration method of claim 1, wherein, In step (2), the separation layer comprises: backfilling and compacting each blind drainage ditch with soil and / or landfill garbage.

8. The landfill gas and water migration method according to claim 1 or 7, wherein, In step (2), the thickness of the separation layer is 1-2 meters.

9. Use of a landfill gas and water vapor barrier method, characterized in that, The working surface of the landfill is guided by water and gas by using the landfill water and gas guiding method according to any one of claims 1-8, until the water content of the landfill after drainage is less than 30%, and the excavation operation is performed; the cycle operation of the aforementioned water and gas guiding and excavation is repeated to realize the stripping excavation of the landfill from the surface to the inside.

10. Use of a landfill gas and water vapor barrier method, characterized in that, The working surface of the landfill is guided by water and gas by using the landfill water and gas guiding method according to any one of claims 1-8, to maintain the shape of the landfill pile.

Images