Vertical partition structure of domestic waste landfill and construction method thereof

Abstract

The present invention provides a vertical partition structure of a domestic waste landfill and a construction method thereof. The vertical partition structure is arranged in a domestic waste landfill, and includes a fly ash landfill area foundation and a fly ash landfill layer. A fly ash landfill area is arranged on the fly ash landfill area foundation, and the fly ash landfill layer is arranged in the fly ash landfill area. The fly ash landfill area foundation includes a domestic waste pile body and a landfill gas drainage reinforced cushion layer stacked in sequence from bottom to top, and the fly ash landfill layer includes an anti-seepage structure layer, a leachate drainage layer and a fly ash solidified material pile body stacked in sequence from bottom to top. The present invention has a simple structure, and makes full use of the remaining storage capacity of the domestic waste landfill to bury the fly ash solidified material, solves the problems of difficult site selection, long construction period and high project investment for a newly built fly ash landfill, and solves the problem of cracking of the landfill gas drainage pipe and leakage of the anti-seepage membrane caused by the settlement of the domestic waste pile body, thereby ensuring the standardized and safe landfilling of the fly ash solidified material in the domestic waste landfill.

Description

Technical Field

[0001] The invention relates to the technical field of garbage disposal, and in particular to a vertical partition structure of a domestic garbage landfill and a construction method thereof. Background Art

[0002] In recent years, the incineration of urban domestic waste for power generation has gradually become the mainstream method of domestic waste disposal. According to the "Pollution Control Standards for Domestic Waste Landfills" (GB16889-2008), fly ash produced during the incineration process can be landfilled in the domestic waste landfill after solidification treatment. At present, the landfills used for landfilling fly ash solids are mostly newly built fly ash landfills, or landfill areas divided horizontally by partition dams when designing landfills. However, for areas where new landfills are limited, using the remaining storage capacity of existing domestic waste landfills for partitioned landfill is a better solution.

[0003] For the zoning of landfills, the existing design schemes are mostly to build zoning dams (dividing dikes) to divide the landfill into independent landfill areas, such as the method published in a landfill method for stabilizing fly ash (CN 109590305). There are also zoning planning for landfilling of landfills to maximize the garbage storage capacity, such as a method for zoning and using landfills (CN107597789) and a landfill process for a regular sanitary landfill for domestic waste (CN110000182). The above scheme is applicable to newly built landfills. For domestic waste landfills that have already buried a large amount of domestic waste, digging out the domestic waste and burning it will not only cause environmental pollution, but also be limited by the acceptance capacity of the domestic waste incineration plant. Therefore, it is a better solution to use the existing domestic waste pile as the bottom of the reservoir for vertical zoning. At present, the expansion scheme on the shaped pile body, on the one hand, only describes the anti-seepage layer, such as the anti-seepage structure used for expansion of sanitary landfill for domestic waste after closure (CN205421353U); on the other hand, expansion schemes are proposed for domestic waste landfills that have reached or exceeded the designed storage capacity, such as the lateral expansion structure for landfills (CN206189473 U), which realizes lateral expansion by building a new garbage dam, a new storage bottom and a new storage bottom anti-seepage system on the outside of the existing garbage dam; in addition, there are also schemes to directly store new garbage on the existing garbage pile body by raising the garbage dam (yard dam), such as an expansion structure for solid waste yards (CN 201762713 U).

[0004] The above technologies have the following deficiencies: 1. They are applicable to newly built landfills; 2. They are applicable to the continued storage of solid wastes of the same nature after expansion, and are not applicable to the use of independent landfill storage areas for solidified fly ash landfill on the domestic waste pile. The materials stored on the domestic waste pile are fly ash solids, and the properties of fly ash solids are completely different from those of domestic waste, and the density of fly ash solids is greater than that of domestic waste. When fly ash solids are soaked in acidic leachate generated by domestic waste for a long time, there is a potential risk of leakage of harmful substances. At the same time, if the leachate generated by fly ash landfill is mixed with the leachate of domestic waste landfill, it may cause the instability and collapse of the existing domestic waste landfill leachate treatment system. Therefore, it is required that fly ash solids and domestic waste be landfilled separately, and an independent landfill storage area that is effectively separated from the domestic waste landfill storage area should be set up. When an independent landfill storage area for solidified fly ash landfill is established on the domestic waste pile, the settlement of the domestic waste pile will bring a series of problems, such as cracking of the landfill gas drainage pipe and damage to the anti-seepage membrane of the anti-seepage system. Summary of the invention

[0005] In view of the defects in the prior art, the object of the present invention is to provide a vertical partition structure of a domestic waste landfill and a construction method thereof.

[0006] According to the vertical partition structure of a domestic waste landfill provided by the present invention, the vertical partition structure is arranged in the domestic waste landfill, and comprises a fly ash landfill area foundation and a fly ash landfill layer, a fly ash landfill area is arranged on the fly ash landfill area foundation, the fly ash landfill layer is arranged in the fly ash landfill area, and the fly ash landfill area foundation comprises:

[0007] The domestic waste pile is formed by shaping the existing domestic waste according to the slope requirements of the fly ash landfill area;

[0008] Landfill gas drainage reinforced cushion;

[0009] The landfill gas drainage reinforced cushion layer comprises:

[0010] The landfill gas drainage layer is used to collect and treat the landfill gas generated by the domestic garbage pile;

[0011] The reinforced cushion layer is used to prevent uneven settlement of the domestic garbage pile from causing leakage of the anti-seepage structure layer;

[0012] The fly ash landfill layer comprises:

[0013] An anti-seepage structural layer, wherein an anti-seepage membrane is arranged in the anti-seepage structural layer;

[0014] The leaching liquid drainage layer is used to collect and process the fly ash leaching liquid generated by the fly ash solidification material pile;

[0015] Fly ash solidification pile.

[0016] Preferably, the landfill gas drainage layer includes a vertical landfill gas drainage system and a horizontal landfill gas drainage system. The vertical landfill gas drainage system includes a gas-guiding gabion well and a vertical drainage pipe arranged in the gas-guiding gabion well. The horizontal landfill gas drainage system includes a gravel drainage blind ditch and a horizontal drainage pipe.

[0017] Preferably, the transverse drainage pipe comprises a transverse branch pipe and a transverse main pipe which are interconnected;

[0018] The connection between the vertical drainage pipe and the transverse drainage pipe, and the connection between the transverse branch pipe and the transverse main pipe are all flexible connections, and a settlement margin is left.

[0019] Preferably, the reinforced cushion layer comprises a crushed stone reinforced cushion layer.

[0020] Preferably, the fly ash landfill area includes a reservoir bottom and a slope, and the anti-seepage structural layer includes a reservoir bottom anti-seepage layer correspondingly arranged on the reservoir bottom and a slope anti-seepage layer correspondingly arranged on the slope;

[0021] A U-shaped settlement buffer zone is provided at the connection between the reservoir bottom anti-seepage layer and the slope anti-seepage layer;

[0022] The anti-seepage structural layer is provided with a lateral settlement margin, and the upper end of the slope anti-seepage layer is temporarily anchored on the slope.

[0023] Preferably, the anti-seepage structural layer includes a sub-membrane protection layer, a secondary anti-seepage layer, a leakage detection layer, a sub-membrane protection layer, a primary anti-seepage layer and an upper membrane protection layer, which are arranged in sequence from bottom to top;

[0024] The secondary anti-seepage layer and the main anti-seepage layer are both provided with anti-seepage membranes inside.

[0025] Preferably, the leachate solution drainage layer is a crushed stone or pebble drainage layer, a leachate solution drainage pipe is buried in the drainage layer, and a drainage inclined well is provided at the end of the leachate solution drainage pipe for draining the fly ash leachate solution.

[0026] Preferably, it also includes a domestic waste leachate drainage well, which passes through the reinforced cushion layer, the anti-seepage structure layer and the fly ash leachate drainage layer in sequence;

[0027] The sub-membrane protective layer, the secondary anti-seepage layer, the sub-membrane protective layer, the main anti-seepage layer and the upper membrane protective layer in the anti-seepage structural layer are fixed on the domestic waste leachate pumping well and can be raised along with the domestic waste leachate pumping well.

[0028] According to the method for constructing the vertical partition structure of a domestic waste landfill of the present invention, the vertical partition structure of a domestic waste landfill is adopted, and the steps are as follows:

[0029] Step 1: Investigate and survey the municipal solid waste landfill to provide a basis for the management of existing municipal solid waste landfills and the foundation treatment of the lower layer of the new fly ash landfill area;

[0030] Step 2: Based on the investigation and survey, treat the existing domestic waste landfill;

[0031] Step 3: Shape the existing domestic waste according to the slope requirements of the fly ash landfill area, and build a landfill gas drainage layer and a reinforced cushion layer on the domestic waste pile formed after treatment to form the foundation of the fly ash landfill area;

[0032] Step 4: constructing a new anti-seepage structural layer in the fly ash landfill area on the foundation of the fly ash landfill area, and constructing a new settlement buffer zone between the reservoir bottom anti-seepage layer and the slope anti-seepage layer;

[0033] Step 5: A new drainage layer for leaching solution is constructed on the anti-seepage structural layer, and an inclined pumping well is provided at the end of the fly ash leaching solution drainage pipe to pump and drain the fly ash leaching solution.

[0034] Preferably, in step 4, a clay layer with a thickness of 300 mm to 500 mm is provided on the foundation of the fly ash landfill area, and the anti-seepage structural layer is provided on the clay layer.

[0035] Compared with the prior art, the present invention has the following beneficial effects:

[0036] 1. The present invention has a simple structure and makes full use of the remaining storage capacity of the domestic waste landfill to bury the fly ash solidified material, thus solving the problems of difficult site selection, long construction period and high project investment for a new fly ash landfill.

[0037] 2. The present invention adopts the technical means of crushed stone reinforced cushion layer, flexible connection of landfill gas drainage pipe, anti-seepage layer settlement buffer zone and reserved settlement margin, which solves the problem of landfill gas drainage pipe cracking and anti-seepage membrane leakage caused by settlement of domestic garbage pile, and ensures the standardized and safe landfill of fly ash solids in domestic garbage landfill. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Other features, objects and advantages of the present invention will become more apparent from the detailed description of non-limiting embodiments made with reference to the following drawings:

[0039] Figure 1 It is a structural schematic diagram of the present invention;

[0040] Figure 2 This is a schematic diagram of the structure of the reservoir bottom anti-seepage layer in Example 1 of the present invention;

[0041] Figure 3 This is a schematic diagram of the structure of the slope anti-seepage layer in Example 1 of the present invention;

[0042] Figure 4 It is a structural schematic diagram of the settlement buffer zone between the reservoir bottom anti-seepage layer and the slope anti-seepage layer in the present invention. DETAILED DESCRIPTION

[0043] The present invention is described in detail below in conjunction with specific embodiments. The following embodiments will help those skilled in the art to further understand the present invention, but are not intended to limit the present invention in any form. It should be noted that, for those of ordinary skill in the art, several changes and improvements can also be made without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0044] The present invention discloses a vertical partition structure of a domestic waste landfill and a construction method thereof. With an existing domestic waste landfill body as the bottom of the reservoir, vertical partition technology is used to realize the partitioned landfill of fly ash solids on the domestic waste body, and the influence of the settlement of the existing domestic waste body on the landfill of fly ash solids is prevented by strengthening foundation treatment, optimizing the landfill gas drainage design, and the anti-seepage system design, so as to ensure the standardized and safe landfill of fly ash solids in the domestic waste landfill.

[0045] According to the vertical partition structure of the domestic waste landfill provided by the present invention, the vertical partition structure is arranged in the domestic waste landfill, such as Figure 1 As shown, it includes a fly ash landfill area foundation and a fly ash landfill layer, a fly ash landfill area is arranged on the fly ash landfill area foundation, the fly ash landfill layer is arranged in the fly ash landfill area, the fly ash landfill area foundation includes, stacked in sequence from bottom to top: a domestic waste pile and a landfill gas drainage reinforced cushion layer, the domestic waste pile is formed by shaping the existing domestic waste according to the slope requirement of the fly ash landfill area; the landfill gas drainage reinforced cushion layer includes: a landfill gas drainage layer, which is used to collect and treat the landfill gas generated by the domestic waste pile; a reinforced cushion layer, which is used to prevent the domestic waste pile from unevenly settling and causing leakage of the anti-seepage structure layer; the fly ash landfill layer includes, stacked in sequence from bottom to top: an anti-seepage structure layer, in which an anti-seepage membrane is arranged; a leachate drainage layer, which is used to pump and discharge the fly ash leachate generated by the fly ash solidified material pile; a fly ash solidified material pile.

[0046] The landfill gas drainage layer includes a vertical landfill gas drainage system and a horizontal landfill gas drainage system. The vertical landfill gas drainage system includes a gas gabion well and a vertical drainage pipe arranged in the gas gabion well. The horizontal landfill gas drainage system includes a gravel drainage blind ditch and a horizontal drainage pipe. The horizontal drainage pipe includes a horizontal branch pipe and a horizontal main pipe that are interconnected. The connection between the vertical drainage pipe and the horizontal drainage pipe and the connection between the horizontal branch pipe and the horizontal main pipe are all flexible connections, and a settlement margin is reserved. The reinforced cushion layer includes a gravel reinforced cushion layer. The fly ash landfill area includes a reservoir bottom and a slope. The anti-seepage structural layer includes a reservoir bottom anti-seepage layer correspondingly arranged on the reservoir bottom and a slope anti-seepage layer correspondingly arranged on the slope. A U-shaped settlement buffer zone is arranged at the connection between the reservoir bottom anti-seepage layer and the slope anti-seepage layer. The anti-seepage structural layer reserves a horizontal settlement margin, and the upper end of the slope anti-seepage layer is temporarily anchored on the slope. Preferably, the anti-seepage structural layer includes a sub-membrane protective layer, a secondary anti-seepage layer, a leakage detection layer, a sub-membrane protective layer, a main anti-seepage layer and an upper membrane protective layer, which are arranged in sequence from bottom to top; the secondary anti-seepage layer and the main anti-seepage layer are both provided with an anti-seepage membrane. The leachate drainage layer adopts a gravel or pebble diversion layer, a leachate drainage pipe is buried in the diversion layer, and a pumping inclined well is provided at the end of the leachate drainage pipe for pumping and draining the fly ash leachate. It also includes a domestic waste leachate drainage well, which passes through the reinforced cushion layer, the anti-seepage structural layer and the fly ash leachate drainage layer in sequence; the sub-membrane protective layer, the secondary anti-seepage layer, the sub-membrane protective layer, the main anti-seepage layer and the upper membrane protective layer in the anti-seepage structural layer are fixed on the domestic waste leachate drainage well, and can rise with the domestic waste leachate drainage well, and leave a sedimentation margin to prevent the fly ash leachate from flowing into the domestic waste pile.

[0047] According to the method for constructing a vertical partition structure of a domestic waste landfill provided by the present invention, the vertical partition structure of a domestic waste landfill is adopted, and the method comprises the following steps:

[0048] Step 1: Investigate and survey the municipal solid waste landfill to provide a basis for the management of existing municipal solid waste landfills and the foundation treatment of the lower layer of the newly built fly ash landfill area; the investigation and survey include whether municipal sludge is buried, whether the leachate drainage system is blocked, whether the landfill gas drainage system is ineffective, the leachate level in the municipal solid waste pile, the bearing capacity of the municipal solid waste pile and geotechnical parameters, etc.;

[0049] Step 2: According to the investigation and survey, the existing domestic waste landfill is treated, including sludge pit treatment, new domestic waste leachate extraction and drainage wells, new landfill gas drainage wells, etc., wherein the sludge pit treatment can be carried out by sludge solidification, riprap to squeeze silt, block stone replacement and other methods;

[0050] Step 3: Shape the existing domestic waste according to the slope requirements of the fly ash landfill area, and build a landfill gas drainage layer and a reinforced cushion layer on the domestic waste pile formed after treatment to form the foundation of the fly ash landfill area;

[0051] Specifically, the landfill gas generated by the existing domestic waste is collected and treated by setting up vertical and horizontal landfill gas drainage systems; the domestic waste pile usually settles with the passage of time and the weight loading of the fly ash landfill area. Therefore, the key point of the foundation treatment plan for the fly ash landfill area is to prevent the domestic waste pile from settling and causing leakage of the anti-seepage membrane of the fly ash landfill area. The present invention properly solves this problem by adopting a crushed stone reinforced cushion layer; in order to prevent the domestic waste pile from settling and causing the landfill gas drainage branch pipe and the main pipe to break, flexible connections are used at the connection between the vertical drainage pipe and the horizontal drainage pipe, and at the connection between the horizontal branch pipe and the horizontal main pipe, and a settlement margin is left.

[0052] Step 4: A new anti-seepage structure layer is built in the fly ash landfill area on the foundation of the fly ash landfill area. Preferably, a double-layer anti-seepage structure is adopted. In order to prevent the uneven settlement of the domestic garbage pile from causing leakage of the anti-seepage membrane, a 300mm to 500mm thick clay layer is set on the reinforced bottom layer. In order to prevent the settlement of the domestic garbage pile from causing cracking and other effects on the anti-seepage system, a U-shaped settlement buffer zone is set at the junction of the bottom anti-seepage layer and the slope anti-seepage layer. The anti-seepage structure layer has a lateral settlement margin reserved, and the upper end of the slope anti-seepage layer is temporarily anchored on the slope. Specifically, Figure 4 As shown, the settlement allowance is reflected in that a certain allowance is set laterally on the top of the slope for the anti-seepage structure layer. When settlement occurs, the settlement allowance can prevent the anti-seepage structure layer from breaking. The temporary anchoring is specifically reflected in compaction by heavy objects (such as sandbags, etc.).

[0053] Step 5: A new leachate drainage layer is built on the anti-seepage structural layer. Preferably, a gravel / pebble drainage layer is used, and a leachate drainage pipe is buried in the gravel / pebble drainage layer to form a leachate drainage layer. A pumping inclined well is set at the end of the leachate drainage pipe to pump and drain the generated fly ash leachate.

[0054] Example 1

[0055] In this embodiment, the vertical zoning structure of the domestic waste landfill is applied to a valley-type domestic waste landfill, which has a designed storage capacity of approximately 2.44 million cubic meters, has landfilled approximately 1.3 million cubic meters of domestic waste, and has a remaining storage capacity of approximately 1.1 million cubic meters.

[0056] By investigating and surveying the current status of the landfill, this embodiment has found out the current status of landfill pollution, such as the amount of municipal sludge landfill and sludge distribution, the blockage of the leachate drainage system, the status of the landfill gas drainage system, the leachate level in the domestic garbage pile, the bearing capacity and geotechnical parameters of the domestic garbage pile, and the water quality of the groundwater monitoring well;

[0057] According to the investigation and survey, this embodiment adopts methods such as stone throwing to squeeze out silt, stone replacement, and sludge solidification to treat the sludge pit. The effective drainage of domestic waste leachate is achieved by building new domestic waste leachate extraction wells, and the effective drainage of landfill gas is achieved by building new landfill gas drainage wells.

[0058] This embodiment reshapes the existing domestic waste pile according to the current topography of the landfill and the slope requirements of the newly built fly ash landfill area. Since the excavation of domestic waste is prone to produce odor and affect the surrounding area, this embodiment adopts the following solution:.

[0059] This embodiment uses software calculation and analysis to analyze the settlement of the domestic garbage pile under different fly ash solidification landfill heights, determines the landfill height of the fly ash solidification, and analyzes the stability of the garbage pile on this basis to ensure that the fly ash solidification pile will not slide, and determines the foundation treatment plan based on this. In addition, this embodiment also conducts an appraisal and analysis of the current structural safety of the garbage dam and the structural safety after solidified fly ash landfill loading to ensure the safety of the garbage dam.

[0060] In order to prevent the settlement of the domestic waste pile and the leakage of the anti-seepage membrane in the fly ash landfill area, the present embodiment adopts a reinforced cushion solution: the reinforced cushion includes laying a layer of geogrid on the rolled and leveled domestic waste pile, and then laying a graded crushed stone layer with a total thickness of 50cm-100cm, wherein geogrids are compacted and laid every 20cm-40cm to form multiple layers of geogrids; crushed stone is more conducive to the drainage of landfill gas, but the investment is higher, so crushed stone soil can also be used; the thickness of the crushed stone / crushed stone soil layer and the number of geogrid layers are verified and adjusted based on the survey data.

[0061] In this embodiment, vertical and horizontal landfill gas drainage layers are formed by newly building gas-guiding gabion wells, gravel drainage blind ditches or gravel drainage layers, landfill gas drainage pipes, horizontal drainage pipes and vertical drainage pipes, and the landfill gas is transported to the flare system for treatment through annular landfill gas drainage main pipes. In order to prevent the settlement of the domestic garbage pile from causing the landfill gas drainage branch pipe and the main pipe to crack, affecting the landfill gas collection effect and landfill safety, the present invention adopts flexible connections at the connection between the vertical drainage pipe and the horizontal drainage pipe, and at the connection between the horizontal branch pipe and the main pipe, and leaves a settlement margin.

[0062] like Figure 2-3As shown, in this embodiment, a new anti-seepage structure layer in the fly ash landfill area is built above the reinforced cushion layer and the landfill gas drainage layer, and a double-layer anti-seepage structure is adopted. The bottom anti-seepage layer of the reservoir is, from bottom to top: 300-500mm thick compacted clay (second protective layer under the membrane), 400-700g / m2 non-woven geotextile protective layer (first protective layer under the membrane), 1.5-3mmHDPE geomembrane anti-seepage layer (secondary anti-seepage layer), 5-8mm geocomposite drainage net (leakage detection layer), 400-700g / m2 non-woven geotextile protective layer (first protective layer under the membrane), 1.5-3mmHDPE geomembrane anti-seepage layer (main anti-seepage layer), 400-700g / m2 non-woven geotextile protective layer (membrane upper protective layer); the slope anti-seepage layer is, from bottom to top: 400-700g / m2 non-woven soil geotextile protective layer (first protective layer under the membrane), 1.5-3mmHDPE geomembrane anti-seepage layer (secondary anti-seepage layer), 5-8mm geocomposite drainage net (leakage detection layer), 400-700g / m2 non-woven geotextile protective layer (first protective layer under the membrane), 1.5-3mmHDPE geomembrane anti-seepage layer (main anti-seepage layer), 400-700g / m2 non-woven geotextile protective layer (protective layer on the membrane); the compacted clay layer can prevent uneven settlement of the domestic garbage pile, and its permeability coefficient is not more than 1×10-7cm / s, and it can also play a role in anti-seepage; in order to prevent the settlement of the domestic garbage pile from causing cracking and other effects on the anti-seepage system, this embodiment sets a settlement buffer zone at the junction of the reservoir bottom anti-seepage and the slope anti-seepage, the slope anti-seepage material reserves a settlement allowance, and the slope anti-seepage layer adopts temporary anchoring.

[0063] In this embodiment, a leachate drainage layer in the fly ash landfill area is newly built above the anti-seepage structural layer. In this embodiment, a 300 mm thick gravel / pebble drainage layer is adopted, and a leachate drainage pipe is buried in the gravel / pebble drainage layer to form a leachate drainage layer. An inclined pumping well is arranged at the end of the leachate drainage pipe to pump and drain the generated fly ash leachate.

[0064] In this embodiment, a geofilter and a HDPE geomembrane are arranged above the drainage layer of the leaching solution in the fly ash landfill area as rainwater and sewage diversion membranes. The fly ash solidification material is landfilled on sunny days and not landfilled on rainy days. The landfill is carried out in zones and units. The rainwater and sewage diversion membranes are opened during landfilling and are welded after the landfilling is completed. In this way, the output of the fly ash leaching solution is controlled to a minimum.

[0065] In this embodiment, the newly built domestic waste leachate extraction well runs through the reinforced cushion layer, the anti-seepage structure layer, and the fly ash leachate drainage layer. In order to prevent the fly ash leachate from flowing into the domestic waste pile and mixing with the domestic waste leachate, the double-layer anti-seepage membrane is raised along with the precipitation well, and a sedimentation margin is left.

[0066] In the description of the present application, it should be understood that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0067] The above describes the specific embodiments of the present invention. It should be understood that the present invention is not limited to the above specific embodiments, and those skilled in the art can make various changes or modifications within the scope of the claims, which does not affect the essence of the present invention. In the absence of conflict, the embodiments of the present application and the features in the embodiments can be combined with each other arbitrarily.

Claims

1. A vertical partition structure of a domestic waste landfill, characterized in that: The vertical partition structure is arranged in a domestic waste landfill, and comprises a fly ash landfill area foundation and a fly ash landfill layer. A fly ash landfill area is arranged on the fly ash landfill area foundation, and the fly ash landfill layer is arranged in the fly ash landfill area. The fly ash landfill area foundation comprises: The domestic waste pile is formed by shaping the existing domestic waste according to the slope requirements of the fly ash landfill area; Landfill gas drainage reinforced cushion; The landfill gas drainage reinforced cushion layer comprises: The landfill gas drainage layer is used to collect and treat the landfill gas generated by the domestic garbage pile; The reinforced cushion layer is used to prevent uneven settlement of the domestic garbage pile from causing leakage of the anti-seepage structure layer; The fly ash landfill layer comprises: An anti-seepage structural layer, wherein an anti-seepage membrane is arranged in the anti-seepage structural layer; The leaching liquid drainage layer is used to collect and process the fly ash leaching liquid generated by the fly ash solidification material pile; Fly ash solidification pile; The landfill gas drainage layer includes a vertical landfill gas drainage system and a horizontal landfill gas drainage system. The vertical landfill gas drainage system includes a gas-guiding gabion well and a vertical drainage pipe arranged in the gas-guiding gabion well. The horizontal landfill gas drainage system includes a gravel drainage blind ditch and a horizontal drainage pipe. The transverse drainage pipe comprises a transverse branch pipe and a transverse main pipe which are interconnected; The connection between the vertical drainage pipe and the horizontal drainage pipe, and the connection between the horizontal branch pipe and the horizontal main pipe are all flexible connections, and a settlement margin is left; The fly ash landfill area includes a reservoir bottom and a slope, and the anti-seepage structural layer includes a reservoir bottom anti-seepage layer correspondingly arranged on the reservoir bottom and a slope anti-seepage layer correspondingly arranged on the slope; A U-shaped settlement buffer zone is provided at the connection between the reservoir bottom anti-seepage layer and the slope anti-seepage layer; The anti-seepage structural layer is provided with a lateral settlement margin, and the upper end of the slope anti-seepage layer is temporarily anchored on the slope.

2. The vertical partition structure of the domestic waste landfill according to claim 1 is characterized in that: The reinforced cushion layer comprises a crushed stone reinforced cushion layer.

3. The vertical partition structure of the domestic waste landfill according to claim 1 is characterized in that: The anti-seepage structure layer includes a sub-membrane protection layer, a secondary anti-seepage layer, a leakage detection layer, a sub-membrane protection layer, a main anti-seepage layer and an upper membrane protection layer, which are arranged in sequence from bottom to top; The secondary anti-seepage layer and the main anti-seepage layer are both provided with anti-seepage membranes inside.

4. The vertical partition structure of the domestic waste landfill according to claim 1 is characterized in that: The leachate drainage layer is a crushed stone or pebble drainage layer, a leachate drainage pipe is buried in the drainage layer, and a pumping inclined well is arranged at the end of the leachate drainage pipe for pumping and draining the fly ash leachate.

5. The vertical partition structure of the domestic waste landfill according to claim 3 is characterized in that: It also includes a domestic waste leachate drainage well, which passes through the reinforced cushion layer, the anti-seepage structure layer and the fly ash leachate drainage layer in sequence; The sub-membrane protective layer, the secondary anti-seepage layer, the sub-membrane protective layer, the main anti-seepage layer and the upper membrane protective layer in the anti-seepage structural layer are fixed on the domestic waste leachate pumping well and can be raised along with the domestic waste leachate pumping well.

6. A method for constructing a vertical partition structure of a domestic waste landfill, characterized in that: The vertical partition structure of a domestic waste landfill as claimed in any one of claims 1 to 5 comprises the following steps: Step 1: Investigate and survey the municipal solid waste landfill to provide a basis for the management of existing municipal solid waste landfills and the foundation treatment of the lower layer of the new fly ash landfill area; Step 2: Based on the investigation and survey, treat the existing domestic waste landfill; Step 3: Shape the existing domestic waste according to the slope requirements of the fly ash landfill area, and build a landfill gas drainage layer and a reinforced cushion layer on the domestic waste pile formed after treatment to form the foundation of the fly ash landfill area; Step 4: constructing a new anti-seepage structural layer in the fly ash landfill area on the foundation of the fly ash landfill area, and constructing a new settlement buffer zone between the reservoir bottom anti-seepage layer and the slope anti-seepage layer; Step 5: A new drainage layer for leaching solution is constructed on the anti-seepage structural layer, and an inclined pumping well is provided at the end of the fly ash leaching solution drainage pipe to pump and drain the fly ash leaching solution.

7. The method for constructing a vertical partition structure of a domestic waste landfill according to claim 6, characterized in that: In step 4, a clay layer with a thickness of 300 mm to 500 mm is provided on the foundation of the fly ash landfill area, and the anti-seepage structural layer is provided on the clay layer.

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