Semi-enclosed valley type hazardous waste flexible landfill

Abstract

The application discloses a semi-closed valley type dangerous waste flexible landfill site, a base, a slope and a garbage dam are enclosed to form a semi-closed valley type landfill site area, and the landfill site further comprises a roof, middle columns, side columns, an anti-seepage system, a leachate collection and drainage system and a groundwater drainage system; the roof is used for stopping rain on the upper part of the landfill site area; the middle columns are located in the landfill site area and used for supporting the roof; the side columns are located at the periphery of the landfill site and form an enclosure structure; the anti-seepage system is divided into a base anti-seepage system used for base anti-seepage, a slope anti-seepage system used for slope anti-seepage and a middle column anti-seepage system used for middle column anti-seepage; the leachate collection and drainage system is inserted in the base anti-seepage system and used for collecting and draining leachate; and the groundwater drainage system is located below the base anti-seepage system and used for draining groundwater. The application can greatly reduce leachate generation and effectively solve the problems of high leachate treatment operation cost and environmental pollution.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of safe landfill disposal of hazardous waste, in particular to a semi-enclosed valley type flexible landfill of hazardous waste. BACKGROUND

[0002] The landfill of hazardous waste is a method for final disposal of hazardous waste, and is an important means and facility for safe disposal of hazardous waste, mainly for blocking the transfer of harmful components such as heavy metals in hazardous waste to the environment and human body, and realizing safe disposal of hazardous waste. The flexible landfill becomes the main landfill disposal facility due to its low cost, relatively mature technology and simple operation.

[0003] The generation of landfill leachate and the avoidance of its harm to the environment are problems that must be considered in the design, construction and operation of the landfill, and are the key problems to be solved in the anti-seepage engineering scheme. The generation of leachate is mainly derived from the infiltration of rainfall in the site, and secondly from the water content of hazardous waste. Its properties and water changes are relatively complex, and are mainly related to many factors such as the composition of hazardous waste, landfill operation process, seasonal change, landfill age and covering material condition. SUMMARY

[0004] The purpose of the present application is to provide a semi-enclosed valley type flexible landfill of hazardous waste to solve the above-mentioned problems.

[0005] To achieve the above purpose, the present application provides the following technical scheme:

[0006] The semi-enclosed valley type flexible landfill of hazardous waste comprises a base, a slope and a waste dam, the base, the slope and the waste dam form a semi-enclosed valley type landfill area, and the landfill further comprises a roof, an intermediate column, a side column, an anti-seepage system, a leachate collection and drainage system and a groundwater drainage system.

[0007] The roof is used for rain blocking on the upper part of the landfill area, and comprises a net rack and a roof, the roof adopts a profiled steel plate, and the net rack is located below the steel plate to support the steel plate.

[0008] The intermediate column is located in the landfill area and is used for supporting the roof.

[0009] The side column is located at the periphery of the landfill to form an enclosure structure.

[0010] The anti-seepage system is divided into a base anti-seepage system for base anti-seepage, a slope anti-seepage system for slope anti-seepage and an intermediate column anti-seepage system for intermediate column anti-seepage.

[0011] The leachate collection and drainage system is inserted in the base anti-seepage system and is used for collecting and draining leachate.

[0012] The groundwater drainage system is located below the foundation seepage prevention system and is used to drain groundwater.

[0013] Furthermore, the base seepage prevention system consists of seepage prevention layer 1, seepage prevention layer 2, protective layer 1, seepage prevention layer 3, seepage prevention layer 4, protective layer 2, and isolation layer from bottom to top.

[0014] Furthermore, the impermeable layer 1 consists of 300mm thick compacted clay and 5000g / m³ of... 2 The geotextile-polymer clay liner is composed of a 2.0mm smooth HDPE geomembrane (presumably referring to a type of geomembrane), and a 600g / m³ protective layer (presumably referring to a type of geomembrane). 2 Polyester nonwoven geotextile, wherein the impermeable layer 3 consists of 300mm thick compacted clay and 5000g / m³ of... 2 The geotextile-polymer clay liner is composed of a 2.0mm thick smooth HDPE geomembrane (layer 4) and a 600g / m³ protective layer. 2 Polyester nonwoven geotextile, wherein the isolation layer has a strength of 200 g / m². 2 PE woven geotextile.

[0015] Furthermore, the slope seepage prevention system consists of, from bottom to top, a protective layer, a secondary artificial lining, a secondary leakage detection layer, a main artificial lining, a protective layer, a primary leakage detection layer, and a pressure layer.

[0016] Furthermore, the protective layer has a strength of 5000 g / m³. 2 The GCL geopolymer clay liner consists of a 2.0mm thick single-sided HDPE geomembrane as the secondary artificial liner, a 6.3mm thick geocomposite three-dimensional drainage grid as the secondary leakage detection layer, a 2.0mm thick single-sided HDPE geomembrane as the primary artificial liner, and a 600g / m² protective layer. 2 The polyester nonwoven geotextile has a primary leakage detection layer of 6.3mm geocomposite three-dimensional drainage grid and a top layer of 300mm thick woven sand bags.

[0017] Furthermore, the intermediate column seepage prevention system consists of, from the inside out, a column, a protective layer 1, a secondary artificial liner, a protective layer 2, a main artificial liner, and a protective layer 3.

[0018] Furthermore, the protective layer 1 has a strength of 600 g / m³. 2 Polyester nonwoven geotextile, the secondary artificial lining is a 2.0mm thick single-layer HDPE geomembrane, and the protective layer 2 is 600g / m². 2 Polyester nonwoven geotextile, wherein the main artificial lining layer is a 2.0mm thick single-layer HDPE geomembrane, and the protective layer 3 is 600g / m². 2 Polyester nonwoven geotextile.

[0019] Furthermore, the leachate collection and drainage system includes a primary leachate drainage layer, a secondary leachate drainage layer, drainage pipes, and a collection well. The primary leachate drainage layer is located between the protective layer 2 and the isolation layer, and is composed of 50cm thick pebbles with a particle size of 30-50mm and HDPE perforated collection pipes. The secondary leachate drainage layer is located between the protective layer 1 and the impermeable layer 3, and uses a 6.3mm composite geogrid drainage net. Both the primary and secondary leachate drainage layers are sequentially connected to the drainage pipes and the collection well.

[0020] Furthermore, the groundwater drainage system consists of, from bottom to top, a filter layer, a groundwater drainage layer, and a protective layer, with the filter layer having a strength of 200 g / m³. 2 PE woven geotextile; groundwater drainage layer is 500mm thick with pebbles of 30-50mm particle size; protective layer is 600g / m². 2 Polyester nonwoven geotextile.

[0021] Compared with the prior art, the present invention has the following advantages:

[0022] (1) By setting up a flexible landfill roof, the amount of leachate generated can be greatly reduced, thus avoiding serious environmental impact and reducing operating costs.

[0023] (2) By setting up a light-transmitting strip on the roof of the flexible landfill, the effects of ultraviolet rays on the anti-seepage system materials are blocked, the lifespan of the anti-seepage system materials is delayed, and the risk of leakage of the anti-seepage system is reduced.

[0024] (3) Flexible landfill sites construct a base seepage prevention system and a slope seepage prevention system. The base and slope of the site adopt a high-standard seepage prevention design scheme to effectively block shallow rainwater retained in the soil at the bottom of the site and the slope from entering the leachate collection system and the pile body, thereby reducing the amount of leachate.

[0025] (4) The flexible landfill is equipped with intermediate columns with anti-seepage systems to ensure the structural safety of the large-span valley-shaped roof, while the anti-seepage system meets the anti-seepage requirements. Attached Figure Description

[0026] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a schematic cross-sectional view of the landfill site according to the present invention;

[0028] Figure 2 This is a schematic diagram of the intermediate column structure of the present invention;

[0029] Figure 3 This is a schematic diagram of the base waterproofing system and the intermediate column waterproofing system of the present invention;

[0030] Figure 4 This is a schematic diagram of the intermediate column seepage prevention system of the present invention.

[0031] The attached diagram lists the components represented by each number as follows:

[0032] Base 100, slope 200, garbage dam 300, roof 400, intermediate column 500, side column 600, seepage prevention system 700, leachate collection and drainage system 800, groundwater drainage system 900, base seepage prevention system 701, slope seepage prevention system 702, intermediate column seepage prevention system 703. Detailed Implementation

[0033] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0034] Please see Figures 1-4 In the middle, a semi-enclosed valley-type flexible landfill for hazardous waste is provided. The landfill includes a base 100, a slope 200, and a waste dam 300. The base 100, slope 200, and waste dam 300 enclose a semi-enclosed valley-type landfill area. The landfill also includes a roof 400, intermediate pillars 500, side pillars 600, an anti-seepage system 700, a leachate collection and drainage system 800, and a groundwater drainage system 900.

[0035] The canopy 400 is used to protect the upper part of the landfill area from rain, and includes a grid frame and a roof. The roof is made of profiled steel sheet, and the grid frame is located below the steel sheet to support the steel sheet.

[0036] The intermediate column 500 is located within the landfill area and is used to support the roof.

[0037] The side pillars 600 are located around the landfill, forming an enclosure structure;

[0038] The seepage prevention system 700 is divided into a base seepage prevention system 701 for base seepage prevention, a slope seepage prevention system 702 for slope seepage prevention, and an intermediate column seepage prevention system 703 for intermediate column seepage prevention.

[0039] The leachate collection and drainage system 800 is interspersed within the base impermeable system 701 and is used to collect and drain leachate.

[0040] The groundwater drainage system 900 is located below the base seepage prevention system 701 and is used to drain groundwater.

[0041] The canopy 400 in this design consists of a space frame and a roof. The roof is made of profiled steel sheets and includes skylights. Its main function is to shield the landfill from rainfall, preventing rainwater from directly entering the landfill and significantly reducing the amount of leachate generated in the flexible landfill area. This helps alleviate the pressure on leachate treatment and reduces the risk of environmental and groundwater pollution. The central columns 500 in this design support the large-span steel structure canopy 400 and are composed of reinforced concrete columns 501 and steel lattice columns 502. The hollow reinforced concrete columns 501 provide sufficient structural strength to ensure that the canopy 400 effectively shelters the upper part of the landfill area from rain. The perimeter columns 600 in this design are located around the perimeter of the landfill, forming an integrated enclosure structure. These perimeter columns 600 are also composed of reinforced concrete columns 501 and steel lattice columns 502. Their function is to further enhance the stability of the landfill area and prevent hazardous waste from leaking out of the landfill boundary, thus providing external protection for the landfill and helping to ensure its safety.

[0042] As an optional embodiment, a skylight strip is installed on the roof to block the effects of ultraviolet rays on the waterproofing material and extend the life of the waterproofing system.

[0043] As an optional embodiment, the roof 400 is equipped with rainwater gutters to guide rainwater to intercepting ditches and discharge it outside the site. Intercepting ditches can also be set along the edge of the site to allow rainwater from outside the site to be discharged into rainwater collection ponds during rainfall, reducing the amount of leachate in the site.

[0044] As an optional embodiment, the span of the intermediate column 500 is approximately 50-60m, and the height is approximately 8-22m. Considering economy and safety, it adopts a combination of reinforced concrete column 501 and steel lattice column 502.

[0045] As an alternative embodiment, the edge column 600 is also composed of reinforced concrete columns and steel lattice columns.

[0046] As an optional embodiment, the base seepage prevention system 701 consists of, from bottom to top, a seepage prevention layer 1 (300mm thick compacted clay + 5000g / m³). 2 GCL geopolymer clay liner), impermeable layer 2 (2.0mm thick smooth HDPE geomembrane), protective layer 1 (polyester nonwoven geotextile (600g / m²)). 2 ), 3 (300mm thick compacted clay + 5000g / m³) 2 GCL geopolymer clay liner), impermeable layer 4 (2.0mm thick smooth HDPE geomembrane), protective layer 2 (600g / m²). 2 Polymer nonwoven geotextile), isolation layer (PE woven geotextile 200g / m2 The compaction degree of the base layer shall not be less than 93%.

[0047] As an optional embodiment, the slope seepage prevention system 702 consists of a protective layer (5000g / m²) from bottom to top. 2 GCL geopolymer clay liner, secondary artificial liner (2.0mm thick single-sided textured HDPE geomembrane), secondary leakage detection layer (6.3mm geocomposite three-dimensional drainage grid), main artificial liner (2.0mm thick single-sided textured HDPE geomembrane), protective layer 1 (600g / m²). 2 Polyester nonwoven geotextile), primary leakage detection layer (6.3mm geocomposite three-dimensional drainage grid), and top layer (300mm thick woven bag sand).

[0048] As an optional embodiment, the intermediate column seepage prevention system 703 consists of a column body and a protective layer 1 (600g / m²) from the inside out. 2 Polyester nonwoven geotextile), secondary artificial lining (2.0mm thick single-layer HDPE geomembrane), protective layer 2 (600g / m²). 2 Polyester nonwoven geotextile), main artificial lining (2.0mm thick single-sided HDPE geomembrane), protective layer 3 (600g / m²). 2 Polyester nonwoven geotextile).

[0049] The seepage prevention system 700 in this plan is designed to prevent leachate from the hazardous waste landfill area from leaking into the ground or the surrounding environment. It effectively isolates the spread of leachate at the base, slope, and intermediate column, ensuring that it will not cause harm to the environment.

[0050] As an optional embodiment, the leachate collection and drainage system 800 includes a primary leachate drainage layer, a secondary leachate drainage layer, drainage pipes, and a collection well. The primary leachate drainage layer is located between the protective layer 2 and the isolation layer, and consists of 50cm thick pebbles with a particle size of 30-50mm and HDPE perforated collection pipes, used for collecting and draining leachate. The secondary leachate drainage layer is located between the protective layer 1 and the impermeable layer 3, used to detect the impermeability of the upper impermeable system and to drain any leachate that may leak. To prevent water stagnation between layers, a 6.3mm composite geogrid is selected as the drainage material for the secondary leachate drainage layer. Both the primary and secondary leachate drainage layers are sequentially connected to the drainage pipes and the collection well.

[0051] As an optional embodiment, the landfill includes a groundwater drainage system 900, which is located below the base impermeable system 701, and consists of a filter layer (200g / m³) from bottom to top. 2PE woven geotextile), groundwater drainage layer (500mm thick gravel, 30-50mm particle size), and protective layer (600g / m²). 2 (Polyester nonwoven geotextile). The groundwater drainage system 900 in this scheme plays a role in the landfill in ensuring the effective management and discharge of groundwater, preventing groundwater pollution, and protecting the structural stability of the landfill. This is an important part of landfill environmental management and helps to reduce adverse impacts on groundwater and the surrounding environment.

[0052] As an optional embodiment, the landfill dam encloses the valley-shaped natural foundation layer to form a landfill area, creating a certain landfill capacity while ensuring the overall safety of the landfill area. Taking this embodiment as an example, the landfill dam is 30m high and adopts a grouted rock dam.

[0053] As an optional embodiment, the landfill is provided with an external access road connecting the landfill to the site. The road is 4 meters wide and has a concrete pavement. The role of the access road in this solution is to provide an effective traffic channel within the landfill, ensuring the transportation and handling of hazardous waste, and meeting road design specifications and seepage prevention requirements. This ensures the normal operation, environmental protection, and safety of the landfill, making it an indispensable infrastructure for landfill operation and management.

[0054] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0055] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A semi-enclosed valley-type flexible landfill for hazardous waste, the landfill comprising a base, slopes, and a waste dam, wherein the base, slopes, and waste dam enclose a semi-enclosed valley-type landfill area, characterized in that: The landfill also includes a roof, intermediate pillars, side pillars, a seepage prevention system, a leachate collection and drainage system, and a groundwater drainage system; The canopy is used to protect the upper part of the landfill area from rain, and includes a grid frame and a roof. The roof is made of profiled steel sheet, and the grid frame is located below the steel sheet to support it. The intermediate pillar is located within the landfill area and is used to support the roof; The side pillars are located around the landfill, forming an enclosure structure; The seepage prevention system is divided into a base seepage prevention system for base seepage prevention, a slope seepage prevention system for slope seepage prevention, and an intermediate column seepage prevention system for intermediate column seepage prevention. The leachate collection and drainage system is interspersed within the base impermeable system and is used to collect and drain leachate. The groundwater drainage system is located below the foundation seepage prevention system and is used to drain groundwater. The canopy consists of a space frame and a roof, with the roof made of profiled steel sheets and equipped with skylights. The intermediate column seepage prevention system consists of, from the inside out, a column body, protective layer 1, secondary artificial lining, protective layer 2, main artificial lining, and protective layer 3; The protective layer 1 has a strength of 600 g / m³. 2 Polyester nonwoven geotextile, the secondary artificial lining is a 2.0mm thick single-layer HDPE geomembrane, and the protective layer 2 is 600g / m². 2 Polyester nonwoven geotextile, wherein the main artificial lining layer is a 2.0mm thick single-layer HDPE geomembrane, and the protective layer 3 is 600g / m². 2 Polyester nonwoven geotextile.

2. The semi-enclosed valley-type flexible landfill for hazardous waste according to claim 1, characterized in that: The base seepage prevention system consists of seepage prevention layer 1, seepage prevention layer 2, protective layer 1, seepage prevention layer 3, seepage prevention layer 4, protective layer 2, and isolation layer from bottom to top.

3. The semi-enclosed valley-type flexible landfill for hazardous waste according to claim 2, characterized in that: The impermeable layer 1 consists of 300mm thick compacted clay and 5000g / m³ of... 2 The geotextile-polymer clay liner is composed of a 2.0mm smooth HDPE geomembrane (presumably referring to a type of geomembrane), and a 600g / m³ protective layer (presumably referring to a type of geomembrane). 2 Polyester nonwoven geotextile, wherein the impermeable layer 3 consists of 300mm thick compacted clay and 5000g / m³ of... 2 The geotextile-polymer clay liner is composed of a 2.0mm thick smooth HDPE geomembrane (layer 4) and a 600g / m³ protective layer. 2 Polyester nonwoven geotextile, wherein the isolation layer has a strength of 200 g / m². 2 PE woven geotextile.

4. The semi-enclosed valley-type flexible landfill for hazardous waste according to claim 1, characterized in that: The slope seepage prevention system consists of, from bottom to top, a protective layer, a secondary artificial lining, a secondary leakage detection layer, a main artificial lining, a protective layer, a primary leakage detection layer, and a pressure layer.

5. The semi-enclosed valley-type flexible landfill for hazardous waste according to claim 4, characterized in that: The protective layer has a strength of 5000 g / m³. 2 The GCL geopolymer clay liner consists of a 2.0mm thick single-sided HDPE geomembrane as the secondary artificial liner, a 6.3mm thick geocomposite three-dimensional drainage grid as the secondary leakage detection layer, a 2.0mm thick single-sided HDPE geomembrane as the primary artificial liner, and a 600g / m² protective layer. 2 The polyester nonwoven geotextile has a primary leakage detection layer of 6.3mm geocomposite three-dimensional drainage grid and a top layer of 300mm thick woven sand bags.

6. The semi-enclosed valley-type flexible landfill for hazardous waste according to claim 2, characterized in that: The leachate collection and drainage system includes a primary leachate drainage layer, a secondary leachate drainage layer, drainage pipes, and a collection well. The primary leachate drainage layer is located between the protective layer 2 and the isolation layer, and consists of 50cm thick pebbles with a particle size of 30-50mm and HDPE perforated collection pipes. The secondary leachate drainage layer is located between the protective layer 1 and the impermeable layer 3, and uses a 6.3mm composite geogrid. Both the primary and secondary leachate drainage layers are sequentially connected to the drainage pipes and the collection well.

7. The semi-enclosed valley-type flexible landfill for hazardous waste according to claim 1, characterized in that: The groundwater drainage system consists of a filter layer, a groundwater drainage layer, and a protective layer from bottom to top. The filter layer has a density of 200g / m³. 2 PE woven geotextile; groundwater drainage layer is 500mm thick with pebbles of 30-50mm particle size; protective layer is 600g / m². 2 Polyester nonwoven geotextile.

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