Dangerous waste landfill closure system

Abstract

A hazardous waste landfill closure system comprises a first anti-seepage layer, a first drainage layer, a second anti-seepage layer, a third anti-seepage layer and a second drainage layer, the first anti-seepage layer, the first drainage layer and the second anti-seepage layer are sequentially arranged below a hazardous waste pile body from top to bottom, and the third anti-seepage layer and the second drainage layer are sequentially arranged above the hazardous waste pile body from bottom to top. The third anti-seepage layer and the first anti-seepage layer form a closed space for containing a hazardous waste pile body, the first drainage layer and the second drainage layer can drain water around the hazardous waste pile body in time, water entering the hazardous waste pile body is reduced, and the third anti-seepage layer and the first anti-seepage layer form the closed space for containing the hazardous waste pile body. And external water can be prevented from entering the hazardous waste pile body to cause instability of the hazardous waste pile body.

Description

Technical Field

[0001] The utility model relates to the technical field of garbage landfill treatment, in particular to a hazardous waste landfill sealing system. Background Art

[0002] Landfills are widely used as a way of waste disposal because of their low cost. When the landfill capacity is exhausted, according to Article 9.1 of the "Hazardous Waste Landfill Pollution Control Standard" (GB18598-2019), "When the landfill operation of a flexible landfill reaches its designed capacity, it should be closed and covered in time.

[0003] The utility model with authorization announcement number CN211621715U discloses a landfill closure structure, including a fly ash pile, wherein the fly ash pile is a flat garbage layer with a compaction density of ≥1000KG / m 3 , also includes a protective layer, an impermeable layer, a drainage layer and a vegetation layer which are arranged above the leveled garbage layer from bottom to top, the leveled garbage layer and the drainage layer are covered with HDPE film and non-woven fabric, the protective layer is non-woven fabric, the impermeable layer is a HDPE film with a permeability coefficient less than 10-13cm / s, and a plurality of exhaust pipes are arranged at intervals in the vegetation layer; the exhaust pipes are spaced 40-50cm apart from each other, the exhaust pipes are conical exhaust pipes, the exhaust pipes extend 2-3cm beyond the planting layer, and the drainage layer is a composite geotextile drainage grid layer.

[0004] In the sealing structure disclosed in the patent document, the anti-seepage layer above the leveled garbage layer and the anti-seepage layer below the leveled garbage layer are not connected as a whole. Water seeping from the vegetation layer seeps into the leveled garbage layer from the position between the two anti-seepage layers, which increases the probability of instability of the leveled garbage layer over time. Summary of the invention

[0005] In view of this, and in response to the above-mentioned deficiencies, it is necessary to propose a hazardous waste landfill closure system with high stability.

[0006] A hazardous waste landfill closure system comprises a first impermeable layer, a first drainage layer, a second impermeable layer, a third impermeable layer and a second drainage layer. Below a hazardous waste pile, the first impermeable layer, the first drainage layer and the second impermeable layer are arranged from top to bottom. Above the hazardous waste pile, the third impermeable layer and the second drainage layer are arranged from bottom to top. The third impermeable layer and the first impermeable layer form a closed space for accommodating the hazardous waste pile.

[0007] Preferably, the hazardous waste landfill closure system includes a first filter layer, a collection layer, and a protective layer. The first filter layer, collection layer, and protective layer are arranged between the first impermeable layer and the hazardous waste pile. Below the hazardous waste pile, the first filter layer, collection layer, and protective layer are arranged from top to bottom.

[0008] Preferably, the hazardous waste landfill closure system comprises an air conducting layer, and the air conducting layer is arranged between the third impermeable layer and the hazardous waste pile.

[0009] Preferably, the hazardous waste landfill closure system comprises a second filter layer and a third filter layer, wherein the second filter layer is arranged between the hazardous waste pile and the air guide layer, and the third filter layer is arranged between the third impermeable layer and the air guide layer.

[0010] Preferably, the hazardous waste landfill closure system comprises a vegetation layer, and the vegetation layer is arranged above the third impermeable layer.

[0011] Preferably, the vegetation layer comprises a nutrient layer and a support layer, and the nutrient layer is arranged above the support layer.

[0012] Preferably, the hazardous waste landfill closure system includes an exhaust component, the exhaust component includes an outlet pipe, the lower end of the outlet pipe is connected to the air guide layer, the upper end of the outlet pipe passes through the third impermeable layer and the second drainage layer, and the upper end of the outlet pipe is connected to the outside world.

[0013] Preferably, the exhaust assembly comprises a collecting pipe, the collecting pipe is a flower pipe, and the collecting pipe is connected to the lower end of the outlet pipe.

[0014] Preferably, the exhaust assembly includes a first connecting pipe and a second connecting pipe, the first connecting pipe is perpendicular to the outlet pipe, one end of the first connecting pipe is connected to the collecting pipe, the other end of the first connecting pipe is connected to the lower end of the outlet pipe, and the second connecting pipe is an inverted "U" shape, and one end of the second connecting pipe is connected to the upper end of the outlet pipe.

[0015] Preferably, the outer wall of the collecting pipe is covered with a geofilter.

[0016] The beneficial effects of the utility model are as follows: the first drainage layer and the second drainage layer can discharge the water around the hazardous waste pile in time to reduce the water entering the hazardous waste pile; the third anti-seepage layer and the first anti-seepage layer form an enclosed space for accommodating the hazardous waste pile, which can prevent external water from entering the hazardous waste pile and causing the hazardous waste pile to become unstable. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the hazardous waste landfill closure system.

[0018] Figure 2 A partial view of the hazardous waste landfill containment system above the waste pile.

[0019] Figure 3 A partial view of the hazardous waste landfill containment system beneath the waste pile.

[0020] Figure 4 It is a schematic diagram of the specific structure of the sleeve seal and flange used to connect the outlet pipe and the third anti-seepage layer.

[0021] In the figure: a first impermeable layer 10, a first drainage layer 20, a second impermeable layer 30, a third impermeable layer 40, a second drainage layer 50, a dam body 60, a first filter layer 70, a collection layer 80, a protective layer 90, an air guide layer 100, a waste pile 110, an exhaust assembly 120, a guide pipe 121, a collection pipe 122, a first connecting pipe 123, a second connecting pipe 124, a sleeve seal 125, a sealing ring 1251, a flexible sleeve 1252, a clamp 1253, and a flange 126. DETAILED DESCRIPTION

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments are briefly introduced below. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0023] See also Figures 1 to 3 An embodiment of the utility model provides a hazardous waste landfill closure system, including a first impermeable layer 10, a first drainage layer 20, a second impermeable layer 30, a third impermeable layer 40, and a second drainage layer 50. Below a hazardous waste pile 110, from top to bottom, there are the first impermeable layer 10, the first drainage layer 20, and the second impermeable layer 30. Above the hazardous waste pile 110, from bottom to top, there are the third impermeable layer 40 and the second drainage layer 50. The third impermeable layer 40 and the first impermeable layer 10 form a closed space for accommodating the hazardous waste pile 110.

[0024] Exemplarily, before laying the first impermeable layer 10, the clay layer under the first impermeable layer 10 is leveled and compacted. The clay layer is about 300 mm. A dam body 60 is arranged around the first impermeable layer 10. The first impermeable layer 10 extends to cover the inner wall and the top wall of the dam body 60 so as to be integrally connected with the third impermeable layer 40. The first impermeable layer 10 and the second impermeable layer 30 are HDPE impermeable membranes with a thickness of 2 mm, and the first drainage layer 20 is a HDPE drainage net with a thickness of 5 mm. A conduit is installed in the first drainage layer 20 to introduce the leachate in the first drainage layer 20 into the collection well. The third impermeable layer 40 is a high-density polyethylene impermeable membrane or a linear low-density polyethylene impermeable membrane with a thickness of 1.5 mm. The permeability coefficient of the second drainage layer 50 should not be less than 0.1 cm / s, and the second drainage layer 50 is connected to the drainage ditch.

[0025] Beneficial effects of the utility model:

[0026] (1) The first drainage layer 20 and the second drainage layer 50 can drain the water around the hazardous waste pile 110 in time to reduce the water entering the hazardous waste pile 110. The third impermeable layer 40 and the first impermeable layer 10 form a closed space for accommodating the hazardous waste pile 110, which can prevent external water from entering the hazardous waste pile 110 and causing the hazardous waste pile 110 to become unstable.

[0027] (2) The double impermeable layer design of the first impermeable layer 10 and the second impermeable layer 30 is not a simple increase in the number of layers. The first drainage layer 20 is arranged between the first impermeable layer 10 and the second impermeable layer 30. Even if the leachate that penetrates from the first impermeable layer 10 enters the first drainage layer 20, it is difficult to penetrate into the deep groundwater through the second impermeable layer 30.

[0028] See also Figures 1 to 3 Furthermore, the hazardous waste landfill closure system includes a first filter layer 70, a collection layer 80, and a protective layer 90. The first filter layer 70, the collection layer 80, and the protective layer 90 are arranged between the first impermeable layer 10 and the hazardous waste pile 110. Below the hazardous waste pile 110, from top to bottom, there are the first filter layer 70, the collection layer 80, and the protective layer 90.

[0029] For example, the protective layer 90 is bentonite or clay with a thickness of 200 mm to protect the first anti-seepage layer 10, the collection layer 80 is a pebble layer with a thickness of 300 mm and a particle size of 20 mm to 50 mm, and the first reverse filter layer 70 is 300 g / m 2 The non-woven fabric prevents hazardous waste from entering the collection layer 80. A drainage main pipe and a drainage branch pipe are installed in the collection layer 80. The drainage branch pipe is a flower pipe. The drainage branch pipe is connected to the drainage main pipe, and the drainage main pipe is connected to the blind ditch.

[0030] See also Figures 1 to 3 Furthermore, the hazardous waste landfill closure system includes an air guide layer 100 , which is arranged between the third impermeable layer 40 and the hazardous waste pile 110 .

[0031] Exemplarily, the air guide layer 100 is gravel with a thickness of not less than 30 cm.

[0032] See also Figures 1 to 3 Further, the hazardous waste landfill closure system includes a second filter layer and a third filter layer, wherein the second filter layer is arranged between the hazardous waste pile 110 and the air guide layer 100, and the third filter layer is arranged between the third impermeable layer 40 and the air guide layer 100. In order to prevent the air guide layer 100 from being blocked.

[0033] Exemplarily, the second filter layer and the third filter layer are both geofilters.

[0034] See also Figures 1 to 3Furthermore, the hazardous waste landfill closure system includes a vegetation layer, which is arranged above the third impermeable layer 40.

[0035] See also Figures 1 to 3 Furthermore, the vegetation layer includes a nutrient layer and a support layer, and the nutrient layer is arranged above the support layer. The third impermeable layer 40 directly provides water storage capacity for the vegetation layer, and indirectly provides drainage capacity for the vegetation layer, thereby preventing water from penetrating into the hazardous waste pile 110. The third impermeable layer 40 can also prevent the landfill gas in the hazardous waste pile 110 from escaping and polluting the environment. The direct function of the second drainage layer 50 is to drain the water that passes through the vegetation layer, thereby improving the stability of the hazardous waste pile 110.

[0036] Exemplarily, the support layer is natural soil with a thickness of about 450 mm, and the nutrient layer is fertile topsoil with a thickness of about 150 mm.

[0037] See also Figures 1 to 3 Furthermore, the hazardous waste landfill closure system includes an exhaust component 120, and the exhaust component 120 includes an outlet pipe 121. The lower end of the outlet pipe 121 is connected to the air guide layer 100, and the upper end of the outlet pipe 121 passes through the third impermeable layer 40 and the second drainage layer 50, and the upper end of the outlet pipe 121 is connected to the outside.

[0038] Exemplarily, the outlet tube 121 is a high-density polyethylene tube with a diameter of 15 cm.

[0039] See also Figures 1 to 3 Further, the exhaust assembly 120 includes a collecting pipe 122, which is a flower pipe and is connected to the lower end of the outlet pipe 121. The landfill gas discharged from the outlet pipe 121 can be centrally collected and processed, for example, the landfill gas is connected to a biogas tank through the outlet pipe 121 for further processing.

[0040] See also Figures 1 to 3 Furthermore, the exhaust assembly 120 includes a first connecting pipe 123 and a second connecting pipe 124. The first connecting pipe 123 is perpendicular to the outlet pipe 121, one end of the first connecting pipe 123 is connected to the collecting pipe 122, and the other end of the first connecting pipe 123 is connected to the lower end of the outlet pipe 121. The second connecting pipe 124 is an inverted "U" shape, and one end of the second connecting pipe 124 is connected to the upper end of the outlet pipe 121.

[0041] See also Figures 1 to 3 Further, the outer wall of the collecting pipe 122 is covered with a geofilter.

[0042] Exemplarily, the junction between the outlet pipe 121 and the third impermeable layer 40 is sealed by a sleeve seal 125 and a flange 126 to prevent water from entering the hazardous waste pile 110 .

[0043] See also Figure 4 In one embodiment, the seal 125 includes a sealing ring 1251, a flexible sleeve 1252, and a clamp 1253. A flange 126 is provided on each side of the third impermeable layer 40. The two flanges 126 are sleeved on the outlet pipe 121. The sealing ring 1251 is fixed relative to the third impermeable layer 40 by the two flanges 126. The flange 126 is fixed relative to the outlet pipe 121. The flange 126 is relatively adjustable relative to the outlet pipe 121. The specific connection relationship is a conventional structure and will not be described in detail. The sealing ring 1251 is sleeved on the outlet pipe 121. One end of the flexible sleeve 1252 is sealed and connected to the sealing ring 1251. The other end of the flexible sleeve 1252 is relatively sealed and connected to the outlet pipe 121 through the clamp 1253. One end of the flexible sleeve 1252 connected to the clamp 1253 is located in the air guide layer 100. The air pressure in the air guide layer 100 can enhance the sealing between the outlet pipe 121 and the flexible sleeve 1252.

[0044] The modules or units in the device of the embodiment of the utility model can be combined, divided and deleted according to actual needs.

[0045] The above disclosure is only a preferred embodiment of the present invention, and it certainly cannot be used to limit the scope of the present invention. A person skilled in the art can understand that all or part of the processes of the above embodiments and equivalent changes made according to the claims of the present invention still fall within the scope of the present invention.

Claims

1. A hazardous waste landfill closure system, characterized by: It includes a first anti-seepage layer, a first drainage layer, a second anti-seepage layer, a third anti-seepage layer, and a second drainage layer. Below the hazardous waste pile, from top to bottom, they are the first anti-seepage layer, the first drainage layer, and the second anti-seepage layer. Above the hazardous waste pile, from bottom to top, they are the third anti-seepage layer and the second drainage layer. The third anti-seepage layer and the first anti-seepage layer form an enclosed space to accommodate the hazardous waste pile.

2. The hazardous waste landfill closure system according to claim 1, characterized in that: The hazardous waste landfill closure system includes a first filter layer, a collection layer, and a protective layer. The first filter layer, the collection layer, and the protective layer are arranged between the first anti-seepage layer and the hazardous waste pile. Below the hazardous waste pile, the first filter layer, the collection layer, and the protective layer are arranged from top to bottom.

3. The hazardous waste landfill closure system according to claim 1, characterized in that: The hazardous waste landfill closure system comprises an air guide layer, which is arranged between the third impermeable layer and the hazardous waste pile.

4. The hazardous waste landfill closure system according to claim 3, characterized in that: The hazardous waste landfill closure system comprises a second filter layer and a third filter layer, wherein the second filter layer is arranged between the hazardous waste pile and the air guide layer, and the third filter layer is arranged between the third impermeable layer and the air guide layer.

5. The hazardous waste landfill closure system according to claim 1, characterized in that: The hazardous waste landfill closure system comprises a vegetation layer, and the vegetation layer is arranged above the third impermeable layer.

6. The hazardous waste landfill closure system according to claim 5, characterized in that: The vegetation layer comprises a nutrient layer and a support layer, and the nutrient layer is arranged above the support layer.

7. The hazardous waste landfill closure system according to claim 3, characterized in that: The hazardous waste landfill closure system includes an exhaust component, which includes an outlet pipe. The lower end of the outlet pipe is connected to the air guide layer, and the upper end of the outlet pipe passes through the third impermeable layer and the second drainage layer, and the upper end of the outlet pipe is connected to the outside world.

8. The hazardous waste landfill closure system according to claim 7, characterized in that: The exhaust assembly comprises a collecting pipe, which is a flower pipe and is connected to the lower end of the outlet pipe.

9. The hazardous waste landfill closure system according to claim 8, characterized in that: The exhaust assembly includes a first connecting pipe and a second connecting pipe. The first connecting pipe is perpendicular to the outlet pipe, one end of the first connecting pipe is connected to the collecting pipe, and the other end of the first connecting pipe is connected to the lower end of the outlet pipe. The second connecting pipe is an inverted "U" shape, and one end of the second connecting pipe is connected to the upper end of the outlet pipe.

10. The hazardous waste landfill closure system according to claim 8, characterized in that: The outer wall of the collecting pipe is covered with a geofilter.

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