Semi-closed valley type hazardous waste flexible landfill

Abstract

The invention discloses a semi-closed valley type hazardous waste flexible landfill which is characterized in that a semi-closed valley type landfill area is defined by a base, a side slope and a garbage dam, and the landfill further comprises a ceiling, middle columns, side columns, an anti-seepage system, a leachate collection and guide drainage system and an underground water guide drainage system; the ceiling is used for shielding rain at the upper part of the landfill area; the middle columns are located in the landfill area and used for supporting the ceiling. The side columns are located on the periphery of the landfill to form an enclosure structure. The anti-seepage system is divided into a base anti-seepage system used for base anti-seepage, a side slope anti-seepage system used for side slope anti-seepage and a middle column anti-seepage system used for middle column anti-seepage. The percolate collecting and guiding and discharging system is inserted into the base anti-seepage system and is used for collecting and guiding and discharging percolate; the underground water guiding and discharging system is located below the base anti-seepage system and used for guiding and discharging underground water. The method provided by the invention can greatly reduce the generation of leachate, and effectively solves the problems of high operation cost and environmental pollution in leachate treatment.

Description

Technical Field

[0001] The invention relates to the technical field of safe landfill disposal of hazardous wastes, in particular to a semi-enclosed valley-type flexible landfill for hazardous wastes. Background Art

[0002] As a method of final disposal of hazardous waste, hazardous waste landfill is an important means and facility for safe disposal of hazardous waste. Its main function is to prevent the transfer of harmful components such as heavy metals in hazardous waste to the environment and human body, so as to achieve safe disposal of hazardous waste. Flexible landfill has become the main landfill disposal facility due to its low cost, relatively mature technology and simple operation.

[0003] The generation of landfill leachate and its prevention of environmental damage are issues that must be considered in the design, construction and operation of landfills, and are also key issues to be addressed in anti-seepage engineering plans. The generation of leachate mainly comes from rainfall infiltration within the site, followed by the water content of hazardous waste. Its properties and water content are relatively complex, mainly related to multiple factors such as the composition of hazardous waste, landfill operation process, seasonal changes, landfill age and cover material conditions. Summary of the invention

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

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A semi-enclosed valley-type flexible landfill for hazardous wastes, the landfill comprising a base, a side slope, and a garbage dam, the base, the side slope, and the garbage dam enclosing a semi-enclosed valley-type landfill area, the landfill also comprising a roof, a middle column, a side column, an anti-seepage system, a leachate collection and drainage system, and a groundwater drainage system;

[0007] The roof is used to protect the upper part of the landfill area from rain, and includes a grid and a roof. The roof is made of corrugated steel plates, and the grid is located under the steel plates to support them.

[0008] The intermediate column is located in the landfill area and is used to support the ceiling;

[0009] The side columns are located around the landfill to form a protective 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 into the base anti-seepage system and is used to collect and drain the leachate;

[0012] The groundwater drainage system is located below the base anti-seepage system and is used for draining groundwater.

[0013] Furthermore, the base anti-seepage system comprises, from bottom to top, an anti-seepage layer 1, an anti-seepage layer 2, a protective layer 1, an anti-seepage layer 3, an anti-seepage layer 4, a protective layer 2, and an isolation layer.

[0014] Furthermore, the anti-seepage layer 1 is composed of 300 mm thick compacted clay and 5000 g / m 2 GCL geopolymer clay liner, the anti-seepage layer 2 is 2.0mm smooth HDPE geomembrane, the protective layer 1 is 600g / m 2 Polyester non-woven geotextile, the anti-seepage layer 3 is composed of 300mm thick compacted clay and 5000g / m 2 The GCL geopolymer clay liner is composed of the anti-seepage layer 4 which is a 2.0 mm thick smooth HDPE geomembrane, and the protective layer 2 is 600 g / m 2 Polyester non-woven geotextile, the isolation layer is 200g / m 2 PE woven geotextile.

[0015] Furthermore, the slope anti-seepage system comprises, from bottom to top, a protective layer, a secondary artificial lining layer, a secondary leakage detection layer, a primary artificial lining layer, a protective layer, a primary leakage detection layer, and a pressure top layer.

[0016] Furthermore, the protective layer is 5000g / m 2 GCL geopolymer adhesive liner, the secondary artificial lining is a 2.0mm thick single-face HDPE geomembrane, the secondary leakage detection layer is a 6.3mm geocomposite three-dimensional drainage grid, the main artificial lining is a 2.0mm thick single-face HDPE geomembrane, the protective layer is 600g / m 2 Polyester non-woven geotextile, the primary leakage detection layer is a 6.3mm geocomposite three-dimensional drainage grid, and the pressure top layer is 300mm thick woven bag sand.

[0017] Furthermore, the intermediate column anti-seepage system includes a column body, a protective layer 1, a secondary artificial lining, a protective layer 2, a primary artificial lining, and a protective layer 3 from the inside to the outside.

[0018] Furthermore, the protective layer 1 is 600g / m 2 Polyester non-woven geotextile, the secondary artificial lining is a 2.0mm thick single-faced HDPE geomembrane, and the protective layer 2 is 600g / m 2 Polyester non-woven geotextile, the main artificial lining is a 2.0mm thick single-face HDPE geomembrane, and the protective layer 3 is 600g / m 2 Polyester non-woven geotextile.

[0019] Furthermore, the leachate collection and drainage system includes a primary leachate drainage layer, a secondary leachate drainage layer, a drainage pipe and a collection well. The primary leachate drainage layer is located between the protective layer 2 and the isolation layer, and is composed of 50 cm thick pebbles with a particle size of 30 to 50 mm and a HDPE perforated collection pipe. The secondary leachate drainage layer is located between the protective layer 1 and the impermeable layer 3, and adopts a 6.3 mm composite geotextile drainage net. The primary leachate drainage layer and the secondary leachate drainage layer are connected to the drainage pipe and the collection well in sequence.

[0020] Furthermore, the groundwater drainage system is composed of a filter layer, a groundwater drainage layer, and a protective layer from bottom to top, and the filter layer is 200g / m 2 PE woven geotextile, groundwater drainage layer is 500mm thick, 30-50mm pebbles, protective layer is 600g / m 2 Polyester non-woven geotextile.

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

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

[0023] (2) By setting up a skylight on the ceiling of the flexible landfill, the influence of ultraviolet rays on the anti-seepage system materials can be blocked, the life of the anti-seepage system materials can be extended, and the risk of leakage in the anti-seepage system can be reduced.

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

[0025] (4) An intermediate column with an anti-seepage system is set inside the flexible landfill to ensure the structural safety of the large-span valley-shaped ceiling and at the same time the setting of the anti-seepage system meets the anti-seepage requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0027] Figure 1 It is a cross-sectional schematic diagram of a landfill of the present invention;

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

[0029] Figure 3 It is a schematic diagram of the base anti-seepage system and the intermediate column anti-seepage system of the present invention;

[0030] Figure 4 It is a schematic diagram of the intermediate column anti-seepage system of the present invention.

[0031] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0032] Base 100, slope 200, garbage dam 300, ceiling 400, middle column 500, side column 600, anti-seepage system 700, leachate collection and drainage system 800, groundwater drainage system 900, base anti-seepage system 701, slope anti-seepage system 702, middle column anti-seepage system 703. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] See also Figure 1-4 In the semi-enclosed valley-type hazardous waste flexible landfill, the landfill includes a base 100, a slope 200, and a garbage dam 300. The base 100, the slope 200, and the garbage dam 300 enclose a semi-enclosed valley-type landfill area. The landfill also includes a roof 400, a middle column 500, a side column 600, an anti-seepage system 700, a leachate collection and drainage system 800, and a groundwater drainage system 900;

[0035] The roof 400 is used to protect the upper part of the landfill area from rain, and includes a grid and a roof. The roof is made of corrugated steel plates, and the grid is located under the steel plates to support them.

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

[0037] The side columns 600 are located around the landfill to form a protective structure;

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

[0039] The leachate collection and drainage system 800 is inserted into the base anti-seepage system 701 and is used to collect and drain the leachate;

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

[0041] The ceiling 400 in this solution is composed of a grid and a roof. The roof is made of corrugated steel plates and is provided with a light strip. Its main function is to block rainfall and prevent rainwater from directly entering the landfill, thereby greatly reducing the amount of leachate generated in the flexible landfill area, which helps to reduce the pressure of leachate treatment and reduces the risk of environmental and groundwater pollution. The middle column 500 in this solution is used to support the large-span steel structure ceiling 400, which is 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 ceiling 400 is used to block rain on the upper part of the landfill area. The side columns 600 in this solution are located around the site to form an overall enclosure structure, which is also composed of reinforced concrete columns 501 and steel lattice columns 502. The role of these side columns 600 is to further enhance the stability of the landfill area and prevent the leakage of hazardous waste at the boundary of the landfill area, playing a role in the peripheral protection of the landfill and helping to ensure the safety of the landfill.

[0042] As an optional embodiment, a skylight strip is provided on the roof to block the influence of ultraviolet rays on the anti-seepage material and extend the life of the anti-seepage system.

[0043] As an optional embodiment, the ceiling 400 is provided with a rainwater gutter to guide rainwater to the interception ditch and discharge it outside the site. The interception ditch can also be set along the edge of the site to allow rainwater outside the site to be discharged into the rainwater collection pool through the interception ditch during rainfall, thereby reducing the amount of leachate in the site.

[0044] As an optional embodiment, the span between the middle columns 500 is about 50-60m and the height is about 8-22m. Considering the economy and safety, the reinforced concrete column 501 and the steel lattice column 502 are used.

[0045] As an optional embodiment, the side column 600 is also composed of a reinforced concrete column and a steel lattice column.

[0046] As an optional embodiment, the base anti-seepage system 701 is an anti-seepage layer 1 (300 mm thick compacted clay + 5000 g / m 2 GCL geopolymer adhesive liner), anti-seepage layer 2 (2.0 mm thick smooth HDPE geomembrane), protective layer 1 (polyester non-woven geotextile (600 g / m 2 ), impermeable layer 3 (300mm thick compacted clay + 5000g / m 2 GCL geopolymer adhesive liner), anti-seepage layer 4 (2.0mm thick smooth HDPE geomembrane), protective layer 2 (600g / m 2 Poly non-woven geotextile), isolation layer (PE woven geotextile 200g / m2 ). The base compaction degree shall not be less than 93%.

[0047] As an optional embodiment, the slope anti-seepage system 702 is a protective layer (5000g / m 2 GCL geopolymer adhesive liner), secondary artificial lining (2.0mm thick single-face HDPE geomembrane), secondary leakage detection layer (6.3mm geocomposite three-dimensional drainage grid), primary artificial lining (2.0mm thick single-face HDPE geomembrane), protective layer 1 (600g / m 2 Polyester non-woven geotextile), primary leakage detection layer (6.3mm geocomposite three-dimensional drainage grid), and top layer (300mm thick woven bag filled with sand).

[0048] As an optional embodiment, the intermediate column anti-seepage system 703 is composed of a column body, a protective layer 1 (600g / m 2 Polyester non-woven geotextile), secondary artificial lining (2.0mm thick single-faced HDPE geomembrane), protective layer 2 (600g / m 2 Polyester non-woven geotextile), main artificial lining (2.0mm thick single-sided HDPE geomembrane), protective layer 3 (600g / m 2 Polyester non-woven geotextile).

[0049] The anti-seepage system 700 in this solution prevents the leachate from the hazardous waste landfill area from leaking into the underground or surrounding environment. The anti-seepage of the base, slope and intermediate column effectively isolates the diffusion of the leachate to ensure that no harm is caused 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, a drainage pipe and a water collection well. The primary leachate drainage layer is located between the protective layer 2 and the isolation layer, and is composed of 50 cm thick pebbles with a particle size of 30 to 50 mm and a HDPE perforated water collection pipe, which is used to collect and drain leachate. The secondary leachate drainage layer is located between the protective layer 1 and the impermeable layer 3, and is used to detect the impermeability of the upper impermeable system of the secondary leachate drainage layer and discharge possible leachate. In order to prevent interlayer water stagnation, a 6.3 mm composite geotextile drainage net is selected as the drainage material of the secondary leachate drainage layer. The primary leachate drainage layer and the secondary leachate drainage layer are connected to the drainage pipe and the water collection well in sequence.

[0051] As an optional embodiment, the landfill includes a groundwater drainage system 900, which is located below the base anti-seepage system 701 and is composed of a filter layer (200g / m 2PE woven geotextile), groundwater drainage layer (500mm thick pebbles, particle size 30-50mm) and protective layer (600g / m 2 Polyester non-woven geotextile). The role of the groundwater drainage layer system 900 in this solution in the landfill is to ensure that groundwater is effectively managed and discharged, prevent groundwater pollution, and protect the structural stability of the landfill. This is an important part of landfill environmental management and helps reduce adverse effects on groundwater and the surrounding environment.

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

[0053] As an optional embodiment, the landfill is equipped with an operating road connecting the outside and the landfill area, which is 4m wide and has a concrete pavement. The operating road in this solution provides an effective traffic channel in the landfill to ensure the transportation and operation of hazardous wastes, and meets the road design specifications and anti-seepage requirements to ensure the normal operation, environmental protection and safety of the landfill. This is an indispensable infrastructure in the operation and management of the landfill.

[0054] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0055] The preferred embodiments of the present invention disclosed above are only used to help illustrate the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to the specific implementation methods described. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A semi-enclosed valley-type hazardous waste flexible landfill, which includes a base, a slope, and a garbage dam, which enclose a semi-enclosed valley-type landfill area, characterized in that: The landfill also includes 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 to protect the upper part of the landfill area from rain, and includes a grid and a roof. The roof is made of corrugated steel plates, and the grid is located under the steel plates to support them. The intermediate column is located in the landfill area and is used to support the ceiling; The side columns are located around the landfill to form a protective structure; 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; The leachate collection and drainage system is inserted into the base anti-seepage system and is used to collect and drain the leachate; The groundwater drainage system is located below the base anti-seepage system and is used for draining groundwater.

2. The semi-enclosed valley-type hazardous waste flexible landfill according to claim 1 is characterized by: The base anti-seepage system comprises, from bottom to top, an anti-seepage layer 1, an anti-seepage layer 2, a protective layer 1, an anti-seepage layer 3, an anti-seepage layer 4, a protective layer 2, and an isolation layer.

3. The semi-enclosed valley-type hazardous waste flexible landfill according to claim 2 is characterized by: The anti-seepage layer 1 is composed of 300 mm thick compacted clay and 5000 g / m 2 GCL geopolymer clay liner, the anti-seepage layer 2 is 2.0mm smooth HDPE geomembrane, the protective layer 1 is 600g / m 2 Polyester non-woven geotextile, the anti-seepage layer 3 is composed of 300mm thick compacted clay and 5000g / m 2 The GCL geopolymer clay liner is composed of the anti-seepage layer 4 which is a 2.0 mm thick smooth HDPE geomembrane, and the protective layer 2 is 600 g / m 2 Polyester non-woven geotextile, the isolation layer is 200g / m 2 PE woven geotextile.

4. The semi-enclosed valley-type hazardous waste flexible landfill according to claim 1 is characterized by: The slope anti-seepage system comprises, from bottom to top, a protective layer, a secondary artificial lining layer, a secondary leakage detection layer, a primary artificial lining layer, a protective layer, a primary leakage detection layer, and a pressure top layer.

5. The semi-enclosed valley-type hazardous waste flexible landfill according to claim 4 is characterized by: The protective layer is 5000g / m 2 GCL geopolymer adhesive liner, the secondary artificial lining is a 2.0mm thick single-face HDPE geomembrane, the secondary leakage detection layer is a 6.3mm geocomposite three-dimensional drainage grid, the main artificial lining is a 2.0mm thick single-face HDPE geomembrane, the protective layer is 600g / m 2 Polyester non-woven geotextile, the primary leakage detection layer is a 6.3mm geocomposite three-dimensional drainage grid, and the pressure top layer is 300mm thick woven bag sand.

6. The semi-enclosed valley-type hazardous waste flexible landfill according to claim 1 is characterized by: The intermediate column anti-seepage system comprises a column body, a protective layer 1, a secondary artificial lining layer, a protective layer 2, a primary artificial lining layer, and a protective layer 3 from the inside to the outside.

7. The semi-enclosed valley-shaped hazardous waste flexible landfill according to claim 6 is characterized by: The protective layer 1 is 600g / m 2 Polyester non-woven geotextile, the secondary artificial lining is a 2.0mm thick single-faced HDPE geomembrane, and the protective layer 2 is 600g / m 2 Polyester non-woven geotextile, the main artificial lining is a 2.0mm thick single-face HDPE geomembrane, and the protective layer 3 is 600g / m 2 Polyester non-woven geotextile.

8. The semi-enclosed valley-type hazardous waste flexible landfill according to claim 2 is characterized by: The leachate collection and drainage system includes a primary leachate drainage layer, a secondary leachate drainage layer, a drainage pipe and a water collection well. The primary leachate drainage layer is located between the protective layer 2 and the isolation layer, and is composed of 50 cm thick pebbles with a particle size of 30 to 50 mm and a HDPE perforated water collection pipe. The secondary leachate drainage layer is located between the protective layer 1 and the impermeable layer 3, and adopts a 6.3 mm composite geotextile drainage net. The primary leachate drainage layer and the secondary leachate drainage layer are connected to the drainage pipe and the water collection well in sequence.

9. The semi-enclosed valley-type hazardous waste flexible landfill according to claim 1 is characterized by: The groundwater drainage system is composed of a filter layer, a groundwater drainage layer, and a protective layer from bottom to top. The filter layer is 200g / m 2 PE woven geotextile, groundwater drainage layer is 500mm thick, 30-50mm pebbles, protective layer is 600g / m 2 Polyester non-woven geotextile.

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