Rigid landfill leachate guiding, discharging and collecting system

Abstract

The utility model relates to a rigid landfill leachate guiding, discharging and collecting system which comprises a plurality of landfill cells arranged in a matrix mode, each landfill cell comprises a containing cavity and a liquid leakage cavity located at the bottom of the containing cavity, the containing cavity and the liquid leakage cavity are separated through a concrete bottom plate, an impermeable layer and a liquid discharging layer are laid in the containing cavity, the impermeable layer covers the side wall and the concrete bottom plate, and the liquid discharging layer covers the side wall of the containing cavity. The liquid drainage layer is arranged on the impermeable layer, a drainage guide hole is formed in the center of the concrete bottom plate and is connected with the containing cavity and the liquid leakage cavity, a liquid drainage pipeline is arranged in the liquid leakage cavity, and leachate is collected through the drainage guide hole and guided to a collection pool. According to the rigid landfill leachate guiding, discharging and collecting system, the impermeable layer is used for preventing leachate leakage and reducing potential influences on the surrounding environment, the liquid discharging layer helps the generated leachate to be effectively discharged, meanwhile, solid waste is prevented from blocking the guiding and discharging holes and the liquid discharging pipeline, the impermeable effect of each landfill unit grid is improved, and the service life of the landfill unit grid is prolonged. And the percolate guiding and discharging efficiency is also improved, so that the percolate is properly managed.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of hazardous waste treatment, more specifically, the present disclosure relates to a rigid landfill leachate drainage collection system. BACKGROUND

[0002] The rigid landfill is a landfill disposal facility using reinforced concrete as a seepage barrier structure, and the hazardous waste treated in the rigid landfill usually has one or more of the properties of corrosivity, toxicity, flammability, reactivity and infectivity.

[0003] As a long-term storage of corrosive, toxic and infectious hazardous waste, rainwater intrusion is an inevitable problem, in addition, part of the hazardous waste itself contains high moisture, therefore, to ensure effective anti-seepage drainage measures is a key link in the environmental protection control of the rigid landfill. CONTENT OF THE INVENTION

[0004] Therefore, the present disclosure provides a rigid landfill leachate drainage collection system to solve the technical defects in the prior art.

[0005] To achieve the above-mentioned purpose, the present disclosure adopts the following technical solutions:

[0006] The present disclosure provides a rigid landfill leachate drainage collection system, comprising a plurality of matrix-arranged landfill cells; the landfill cell comprises a containing cavity and a liquid leakage cavity located at the bottom of the containing cavity, and the containing cavity and the liquid leakage cavity are configured to be separated by a concrete bottom plate;

[0007] The containing cavity is paved with an anti-seepage layer and a liquid drainage layer, the anti-seepage layer is configured to be paved on the side wall of the containing cavity and the concrete bottom plate, and the liquid drainage layer is configured to be paved on the outside of the anti-seepage layer;

[0008] A drainage hole is arranged at the center position of the concrete bottom plate, and the containing cavity is configured to be communicated with the liquid leakage cavity through the drainage hole; wherein a liquid drainage pipeline is installed in the liquid leakage cavity, and the liquid drainage pipeline is configured to be communicated with the drainage hole, so as to converge the leachate into a leachate collection pool.

[0009] In an embodiment of the present disclosure, the anti-seepage layer comprises, from the outside to the inside, a first non-woven geotextile, an HDPE film and a second non-woven geotextile, the first non-woven geotextile and the second non-woven geotextile are fixed on both sides of the HDPE film by hot melt welding or adhesive bonding, and the first non-woven geotextile and the second non-woven geotextile are configured to protect the HDPE film.

[0010] In one embodiment of the present disclosure, the HDPE film is provided with openings corresponding to the drainage holes on the second non-woven geotextile.

[0011] In one embodiment of the present disclosure, the side wall of the accommodating cavity and the position where the side wall meets the concrete bottom plate are provided with a fixing member configured to fix the impermeable layer.

[0012] In one embodiment of the present disclosure, the drainage layer comprises a heavy steel grating composed of steel bars arranged in a staggered manner, and support plates vertically arranged at both ends of the heavy steel grating, the support plates being configured to be placed on the impermeable layer to support the heavy steel grating, wherein a certain distance is left between the heavy steel grating and the first non-woven geotextile.

[0013] In one embodiment of the present disclosure, the distance between the longitudinal steel bars of the heavy steel grating is 40 mm, the distance between the transverse steel bars is 50 mm, and the thickness is 40 mm.

[0014] In one embodiment of the present disclosure, the drainage layer further comprises a three-dimensional composite drainage net placed on the heavy steel grating, the three-dimensional composite drainage net being composed of a third non-woven geotextile, a three-dimensional mesh structure, and a fourth non-woven geotextile arranged in sequence, the three-dimensional mesh structure comprising a plurality of ribs arranged at a certain distance and angle.

[0015] In one embodiment of the present disclosure, a slope is arranged between the side wall in the accommodating cavity and the drainage hole.

[0016] In one embodiment of the present disclosure, a corrosion-resistant plastic funnel is arranged between the drainage hole and the drainage pipeline, the outlet of the corrosion-resistant plastic funnel is provided with an inclined angle, and the corrosion-resistant plastic funnel is configured to drain the leachate in the accommodating cavity into the drainage pipeline.

[0017] In one embodiment of the present disclosure, the drainage pipeline is made of polyvinyl chloride material.

[0018] The rigid landfill leachate drainage and collection system provided by the present disclosure uses an impermeable layer to prevent leachate leakage and reduce the potential impact on the surrounding environment, and a drainage layer to effectively drain the generated leachate while preventing solid waste from blocking the drainage holes and the drainage pipeline, which not only improves the impermeability of each landfill cell, but also improves the drainage efficiency of the leachate, so that the leachate is properly managed.

[0019] Other features of the present disclosure and its advantages will become apparent from the following detailed description of exemplary embodiments thereof, with reference to the drawings. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is a cross-sectional view of a landfill cell 1 provided by an embodiment of the present disclosure;

[0021] Figure 2 is a top view of a rigid landfill leachate drainage and collection system provided by an embodiment of the present disclosure;

[0022] Figure 3 is a side view of a heavy steel grating provided by an embodiment of the present disclosure;

[0023] Figure 4 is a structural schematic view of a three-dimensional composite drainage net provided by an embodiment of the present disclosure.

[0024] 1 - landfill cell; 2 - containing cavity; 3 - liquid leakage cavity; 4 - three-dimensional composite drainage net; 5 - heavy steel grating; 6 - first non-woven geotextile; 7 - HDPE film; 8 - second non-woven geotextile; 9 - concrete bottom plate; 10 - drainage hole; 11 - leachate collection tank; 12 - fixing member; 13 - anti-corrosion plastic funnel; 14 - support plate; 15 - third non-woven geotextile; 16 - three-dimensional net structure; 17 - fourth non-woven geotextile; 18 - lane; 19 - tower crane; 20 - concrete retaining wall; 21 - maintenance passage. DETAILED DESCRIPTION

[0025] Various exemplary embodiments of the present disclosure will now be described in detail by referring to the drawings. It should be noted that the relative arrangement, numerical expressions, and values of the components and steps set forth in these embodiments are not limiting to the scope of the present disclosure unless otherwise specifically stated.

[0026] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way limiting to the scope of the disclosure and its applications or uses.

[0027] Techniques, methods, and devices known to those of ordinary skill in the relevant art can not be discussed in detail herein. However, where appropriate, such techniques, methods, and devices can be viewed as part of the specification and may

[0028] It should be noted that like reference numerals and letters refer to like items throughout the drawings, and as a result, further discussion of such items is unnecessary in subsequent drawings.

[0029] The specific embodiments of the present disclosure will be described below with reference to the drawings.

[0030] In this document, "upper", "lower", "front", "rear", "left", "right", and the like are used to describe relative positions between the relevant parts, and do not limit the absolute positions of the relevant parts.

[0031] In the present text, "first", "second", and the like are used only for mutual differentiation, and not to indicate importance and order, and the premise of each other.

[0032] In the present text, "equal", "same", and the like are not strictly limited in the mathematical and / or geometric sense, but also include errors allowed by manufacturing or use that can be understood by those skilled in the art.

[0033] The present disclosure relates to a rigid landfill leachate drainage collection system, comprising a plurality of landfill cells arranged in a matrix, each of which contains a containing cavity and a liquid leakage cavity at the bottom, separated by a concrete bottom plate, an impermeable layer and a drainage layer are laid inside the containing cavity, the impermeable layer covers the side wall and the concrete bottom plate, and the drainage layer is placed on the impermeable layer, a drainage hole is provided in the center of the concrete bottom plate, connecting the containing cavity and the liquid leakage cavity, a drainage pipeline is installed in the liquid leakage cavity, and the leachate is collected through the drainage hole and guided to the collection tank.

[0034] The rigid landfill leachate drainage collection system provided by the present disclosure uses an impermeable layer to prevent leachate from leaking and reduce the potential impact on the surrounding environment, and a drainage layer to effectively drain the generated leachate while preventing solid waste from blocking the drainage hole and the drainage pipeline. This not only improves the impermeability of each landfill cell, but also improves the drainage efficiency of the leachate, so that the leachate is properly managed.

[0035] For ease of understanding, the specific structure of the rigid landfill leachate drainage collection system of the present disclosure and its working principle will be described in detail below with reference to Figures 1 to 4 an embodiment.

[0036] As shown in Figure 1 and Figure 2 , the present disclosure provides a rigid landfill leachate drainage collection system, comprising a plurality of landfill cells 1 arranged in a matrix; the landfill cell 1 comprises a containing cavity 2 and a liquid leakage cavity 3 at the bottom of the containing cavity 2, and the containing cavity 2 and the liquid leakage cavity 3 are separated by a concrete bottom plate 9; an impermeable layer and a drainage layer are laid inside the containing cavity 2, the impermeable layer is laid on the side wall of the containing cavity 2 and the concrete bottom plate 9, and the drainage layer is laid on the outside of the impermeable layer; a drainage hole 10 is provided at the center position of the concrete bottom plate 9, and the containing cavity 2 is communicated with the liquid leakage cavity 3 through the drainage hole 10; wherein a drainage pipeline is installed in the liquid leakage cavity 3, and the drainage pipeline is communicated with the drainage hole 10, so as to collect the leachate into a leachate collection tank 11.

[0037] Specifically, in addition to setting multiple matrix-arranged landfill cells 1 in the rigid landfill site, a tower crane 19 is also set in the center of the rigid landfill site, and a lane 18 is set on the side connected to the tower crane 19 for the passage of transport vehicles. In actual application, the transport vehicles transport ton-bag-packed hazardous waste to the working radius of the tower crane 19 through the lane 18, and then the tower crane 19 hoists the ton-bag-packed hazardous waste to the corresponding landfill cell 1 for unpacking and landfill. Due to the intrusion of rainwater and the high moisture content of part of the hazardous waste itself, leachate will be generated after landfill. The leachate is transported to the leachate collection tank 11 shown in Figure 2 at least three of which are set in the lane and the other two are set on the side of the rigid landfill site. A concrete retaining wall 20 and a maintenance passage 21 are set outside the landfill cell 1 near the outer side. The maintenance passage 21 is a passage formed by the closure of the concrete retaining wall 20 and the side wall of the landfill cell 1, and the operating personnel can enter the maintenance passage 21 to maintain the landfill cell 1.

[0038] The landfill cell 1 adopts a matrix arrangement, each cell is relatively independent, and can be operated and monitored individually, thereby improving the flexibility of the overall system. Each landfill cell 1 includes a containing cavity 2 for storing hazardous waste and a leachate cavity 3 at the bottom of the containing cavity 2. The two cavities are separated by a solid concrete bottom plate 9 to ensure structural stability and effectively prevent direct contact of hazardous waste with groundwater. The design of the concrete bottom plate 9 takes into account the load-bearing capacity and corrosion resistance, and can withstand the pressure and chemical corrosion of waste for a long time.

[0039] Further, in order to prevent leakage of hazardous substances, a high-quality impermeable layer is laid on the side wall of the containing cavity 2 and the concrete bottom plate 9, which has excellent impermeability and chemical corrosion resistance, can effectively prevent liquid permeation and protect groundwater resources and soil resources from pollution. The laying process of the impermeable layer is strictly required to ensure that there is no gap or defect, forming a complete sealing barrier. Outside the impermeable layer, a drainage layer is laid, which has the function of guiding the flow of leachate and quickly draining the leachate, while avoiding the problem of blockage of the drainage system. A drainage hole 10 is set at the center position of the concrete bottom plate 9, which communicates the containing cavity 2 with the leachate cavity 3 below. The leachate cavity 3 is provided with a drainage pipeline which communicates with the drainage hole 10, ensuring that the leachate can be effectively collected and transported to a special leachate collection tank 11 for treatment.

[0040] As shown in Figure 1 and Figure 2As shown, in one embodiment of the present disclosure, the impermeable layer comprises, from outside to inside, a first non-woven geotextile 6, an HDPE film 7, and a second non-woven geotextile 8, the first non-woven geotextile 6 and the second non-woven geotextile 8 are fixed on both sides of the HDPE film 7 by hot melt welding or adhesive method, and the first non-woven geotextile 6 and the second non-woven geotextile 8 are used to protect the HDPE film 7.

[0041] Specifically, in order to further improve the impermeability of the landfill cell 1, the impermeable layer adopts a multi-layer composite structure, which comprises, from outside to inside, a 300g / m 2 The first non-woven geotextile 6, the 1.5mm-thick HDPE film 7, and the 300g / m 2 The second non-woven geotextile 8, wherein the first non-woven geotextile 6 is laid on the outermost side and is made of high-strength and corrosion-resistant polyester fibers, has good water permeability and tensile strength, and the main function of this layer is to prevent external debris (such as stones and sharp objects) from directly contacting and damaging the middle HPDE film, the HDPE film 7 is the core structure of the impermeable layer and is made of high-density polyethylene (HDPE) material, has excellent impermeability, chemical corrosion resistance and mechanical strength, and can effectively prevent the penetration of liquid and harmful substances, the second non-woven geotextile 8 is similar to the first non-woven geotextile 6 and is also made of high-strength and corrosion-resistant polyester fibers, and plays a role in protecting the HDPE film 7 from physical damage and chemical corrosion.

[0042] Further, in order to ensure the close connection between the layers of the impermeable layer and the overall stability, the first non-woven geotextile 6 and the second non-woven geotextile 8 are fixed on both sides of the HDPE film 7 by hot melt welding or adhesive method, and these two fixing methods have their own advantages, wherein the hot melt welding melts and combines the non-woven geotextile and the HDPE film 7 surface together through high temperature, this method has high joint strength and good sealing performance, and can effectively prevent water and harmful substances from penetrating from the joint; the adhesive method uses special waterproof glue to bond the non-woven geotextile and the HDPE film 7 together, and this method is relatively simple to operate.

[0043] As shown in the drawings, Figure 1 As shown, in one embodiment of the present disclosure, the HDPE film 7 and the second non-woven geotextile 8 are provided with openings corresponding to the guide and drain holes 10.

[0044] Specifically, since the first non-woven geotextile 6 directly contacts the leachate which may contain solid particles, if directly entering the drainage pipe through the drainage hole 10, it is easy to cause the drainage pipe to be blocked, therefore, in order to ensure that the leachate can flow smoothly from the containing cavity 2 into the leakage cavity 3 and be discharged through the drainage pipe, the HDPE film 7 and the second non-woven geotextile 8 are provided with openings corresponding to the drainage hole 10 at the center position of the concrete bottom plate 9, and the first non-woven geotextile 6 is not provided with openings, so that the solid particles in the leachate can be filtered out, preventing the particles from blocking the drainage hole 10, thereby ensuring the smoothness of the entire system.

[0045] As shown in Figure 1 In one embodiment of the present disclosure, the side wall of the containing cavity 2 and the position where the side wall meets the concrete bottom plate 9 are provided with a fixing member 12 for fixing the impermeable layer.

[0046] Specifically, since the above-mentioned impermeable layer is arranged on the side wall and the concrete bottom plate 9 below 1m from the top of the containing cavity 2, wherein 1m below is the maximum depth that the leachate may be filled, the fixing member 12 is arranged on the side wall and the position where the side wall meets the concrete bottom plate 9 to fix the impermeable layer, and the main function of the fixing member 12 is to prevent the impermeable layer from being displaced under external pressure or other external forces, especially in a rigid landfill site, as the hazardous waste is filled and compacted, the impermeable layer may slide or lift, and the fixing member 12 can effectively prevent this phenomenon, ensuring that the impermeable layer is firmly attached to the side wall and the concrete bottom plate 9. The fixing member 12 can be an anchor nail, which is fixed by directly penetrating the impermeable material and being fixed on the side wall or the bottom plate.

[0047] As shown in Figure 1 and Figure 3 In one embodiment of the present disclosure, the drainage layer includes a heavy steel grating 5 composed of steel bars arranged in a staggered manner, and a support plate 14 is vertically arranged at both ends of the heavy steel grating 5, and the support plate 14 is placed on the impermeable layer for supporting the heavy steel grating 5, wherein a certain distance is left between the heavy steel grating 5 and the first non-woven geotextile 6.

[0048] Specifically, the heavy steel grating 5 as a key component in the drainage layer is composed of staggered steel bars, and the staggered steel bars form multiple channels, so that the leachate can flow smoothly through the channels into the lower layer. Compared with solid materials, the open structure of the heavy steel grating 5 greatly improves the flow efficiency of the liquid. Among them, the heavy steel grating 5 does not directly contact the impermeable layer due to the presence of the support plate 14, but leaves a certain distance between the heavy steel grating 5 and the impermeable layer, thereby protecting the impermeable layer and preventing sharp objects or heavy objects in the hazardous waste from directly contacting the impermeable layer, causing damage to the impermeable layer. The first non-woven geotextile 6 as a filter layer can effectively intercept solid particles in the leachate, preventing them from entering the drainage hole 10, leaving enough space for the non-woven geotextile to filter, while avoiding the loss of filtering function of the non-woven geotextile due to close contact with the steel grating.

[0049] As shown in Figure 3 , in one embodiment of the present disclosure, the longitudinal steel bars of the heavy steel grating 5 have a spacing of 40 mm, the transverse steel bars have a spacing of 50 mm, and the thickness is 40 mm.

[0050] Specifically, the narrower longitudinal spacing provides higher transverse support force, enhances the overall rigidity of the heavy steel grating 5, and helps the heavy steel grating 5 maintain its shape when subjected to the pressure of the hazardous waste above, reducing the possibility of deformation. The slightly wider transverse spacing ensures sufficient support force while providing a larger channel for liquid flow, which can improve the flow efficiency of the liquid while ensuring structural strength. The thickness of 40 mm can significantly increase its carrying capacity, especially during long-term use, effectively resisting additional loads caused by settlement, compaction, etc.

[0051] As shown in Figure 1 and Figure 4 , in one embodiment of the present disclosure, the drainage layer further includes a three-dimensional composite drainage net 4 placed on the heavy steel grating 5, which is composed of a third non-woven geotextile 15, a three-dimensional mesh structure 16 and a fourth non-woven geotextile 17 arranged in sequence. The three-dimensional mesh structure 16 includes a plurality of ribs arranged at a certain spacing and angle.

[0052] Specifically, the three-dimensional composite drainage net 4 placed on the heavy steel grating 5 in the drainage layer is an important component of the drainage layer, which is composed of a third non-woven geotextile 15, a three-dimensional mesh structure 16 and a fourth non-woven geotextile 17 arranged in sequence. The third non-woven geotextile 15 directly contacts the hazardous waste, and its main function is to protect the three-dimensional mesh structure 16 from being damaged during construction and use. The three-dimensional mesh structure 16 is composed of a plurality of ribs arranged at a certain interval and angle, forming a three-dimensional grid structure, which not only provides excellent mechanical strength, but also effectively guides the flow of leachate. Compared with the traditional planar structure, the three-dimensional mesh structure 16 greatly improves the flow efficiency of the liquid. The fourth non-woven geotextile 17 directly contacts the heavy steel grating 5, and its main function is to further filter out small particles in the leachate and reduce the possibility of hazardous waste solids entering the lower layer.

[0053] As shown in Figure 1 , in one embodiment of the present disclosure, a slope is arranged between the side wall of the accommodating cavity 2 and the drainage hole 10.

[0054] Specifically, using a 0.5% slope can use the action of gravity to make the leachate naturally flow from all around to the drainage hole 10, making the leachate more evenly distributed during the flow to the lower layer, avoiding local water accumulation, thereby improving the efficiency of the entire drainage system. At the same time, the design of the slope can reduce the local stress concentration caused by uneven settlement, making the structure of the entire accommodating cavity 2 more stable.

[0055] As shown in Figure 1 , in one embodiment of the present disclosure, a corrosion-resistant plastic funnel 13 is arranged between the drainage hole 10 and the drainage pipeline, and the outlet of the corrosion-resistant plastic funnel 13 is provided with an inclined angle. The corrosion-resistant plastic funnel 13 is used to guide the leachate in the accommodating cavity 2 into the drainage pipeline.

[0056] Specifically, the corrosion-resistant plastic funnel 13 arranged between the drainage hole 10 and the drainage pipeline is mainly used to collect and guide the leachate in the accommodating cavity 2 to the drainage pipeline. Through the corrosion-resistant plastic funnel 13, the dispersed leachate can be effectively converged to a point, reducing the residence time of the leachate around the drainage hole 10 and improving the drainage efficiency. The shape of the funnel allows the leachate to flow smoothly into the drainage pipeline, avoiding the accumulation of liquid near the drainage hole 10 and reducing the risk of overflow. The inclined angle of the outlet can reduce the head loss when the liquid enters the drainage pipeline, reducing the pressure demand of the system, which is particularly important for long-distance transportation of leachate, can reduce the energy consumption of the pump station, and improve the energy efficiency of the entire system.

[0057] As shown in Figure 1 , in one embodiment of the present disclosure, the drainage pipeline is made of polyvinyl chloride material.

[0058] Specifically, since the liquid drainage pipeline circulates the leachate of hazardous waste, which is corrosive, and the polyvinyl chloride material has excellent corrosion resistance, it can resist the corrosion of most acids, alkalis and salts, so the liquid drainage pipeline made of polyvinyl chloride material is more suitable, and in order to better communicate with the anticorrosive plastic funnel 13, and at the same time utilize gravity to promote the flow of leachate, the liquid drainage pipeline is arranged with the same 0.5% slope as the outlet inclined angle of the anticorrosive plastic funnel 13, which can not only ensure the smooth flow of liquid, but also will not be too steep to affect construction and maintenance.

[0059] The rigid landfill leachate drainage and collection system provided by the present disclosure utilizes the impermeable layer to prevent leachate leakage and reduce potential impact on the surrounding environment, and the drainage layer helps effectively drain the generated leachate, while preventing solid waste from blocking the drainage holes and the liquid drainage pipeline, which not only improves the impermeability of each landfill cell, but also improves the drainage efficiency of the leachate, so that the leachate is properly managed.

[0060] It should be noted that, for the foregoing method embodiments, in order to facilitate description, they are all expressed as a combination of a series of actions, but those skilled in the art should know that the present disclosure is not limited by the order of the described actions, because according to the present disclosure, certain steps can be performed in other orders or simultaneously. Secondly, those skilled in the art should know that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily essential to the present disclosure.

[0061] In the above embodiments, the description of each embodiment has its own focus, and the parts not described in detail in a certain embodiment can be referred to the related description of other embodiments.

[0062] The preferred embodiments of the present disclosure disclosed above are only used to help explain the present disclosure. The alternative embodiments do not describe all the details and do not limit the invention to the specific embodiments described. Obviously, according to the content of the present disclosure, many modifications and changes can be made. The present disclosure selects and describes these embodiments in order to better explain the principles and practical applications of the present disclosure, so that those skilled in the art can well understand and utilize the present disclosure. The present disclosure is limited only by the claims and their full scope and equivalents.

Claims

1. A rigid landfill leachate drainage collection system characterized by, The landfill cell (1) comprises a containing cavity (2) and a liquid leakage cavity (3) at the bottom of the containing cavity (2), and the containing cavity (2) and the liquid leakage cavity (3) are separated by a concrete bottom plate (9); The containing cavity (2) is paved with an impervious layer and a liquid drainage layer, the impervious layer is configured to be paved on the side wall of the containing cavity (2) and the concrete bottom plate (9), and the liquid drainage layer is configured to be paved outside the impervious layer; A guide drainage hole (10) is arranged at the center of the concrete bottom plate (9), and the containing cavity (2) is configured to communicate with the liquid leakage cavity (3) through the guide drainage hole (10); wherein a liquid drainage pipeline is installed in the liquid leakage cavity (3), and the liquid drainage pipeline is configured to communicate with the guide drainage hole (10) to collect the leachate into a leachate collection tank (11).

2. The rigid landfill leachate drainage collection system according to claim 1, wherein, The impervious layer comprises a first non-woven geotextile (6), an HDPE film (7) and a second non-woven geotextile (8) from outside to inside, the first non-woven geotextile (6) and the second non-woven geotextile (8) are fixed on both sides of the HDPE film (7) by hot melt welding or adhesive bonding, and the first non-woven geotextile (6) and the second non-woven geotextile (8) are configured to protect the HDPE film (7).

3. The rigid landfill leachate drainage collection system according to claim 2, wherein, The HDPE film (7) and the second non-woven geotextile (8) are provided with openings corresponding to the guide drainage hole (10).

4. The rigid landfill leachate drainage collection system according to claim 3, wherein, The side wall of the containing cavity (2) and the position where the side wall meets the concrete bottom plate (9) are provided with a fixing member (12), and the fixing member (12) is configured to fix the impervious layer.

5. The rigid landfill leachate drainage collection system according to claim 4, wherein, The liquid drainage layer comprises a heavy steel grating (5) composed of steel bars arranged in a staggered manner, and support plates (14) are vertically arranged at both ends of the heavy steel grating (5), the support plates (14) are configured to be placed on the impervious layer to support the heavy steel grating (5), and a certain distance is left between the heavy steel grating (5) and the first non-woven geotextile (6).

6. The rigid landfill leachate drainage collection system according to claim 5, wherein, The distance between the longitudinal steel bars of the heavy steel grating (5) is 40 mm, the distance between the transverse steel bars is 50 mm, and the thickness is 40 mm.

7. The rigid landfill leachate drainage collection system according to claim 5, wherein, The liquid drainage layer further comprises a three-dimensional composite drainage net (4) placed on the heavy steel grating (5), and the three-dimensional composite drainage net (4) is composed of a third non-woven geotextile (15), a three-dimensional net structure (16) and a fourth non-woven geotextile (17) arranged in sequence, and the three-dimensional net structure (16) comprises a plurality of ribs arranged at a certain distance and angle.

8. The rigid landfill leachate drainage collection system of claim 1, wherein, A slope is arranged between the side wall of the containing cavity (2) and the guide drainage hole (10).

9. The rigid landfill leachate drainage collection system of claim 1, wherein, A corrosion-resistant plastic funnel (13) is arranged between the guide drainage hole (10) and the liquid drainage pipeline, and the outlet of the corrosion-resistant plastic funnel (13) is provided with an inclined angle, and the corrosion-resistant plastic funnel (13) is configured to guide the leachate in the containing cavity (2) into the liquid drainage pipeline.

10. The rigid landfill leachate drainage collection system according to claim 8, wherein, The liquid drainage pipeline is made of polyvinyl chloride material.

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