Landfill drainage system and rigid landfill
By designing a multi-layered drainage pipe structure and filtration device, the complexity and leakage problems of the landfill gas and leachate drainage system were solved, achieving efficient gas and liquid pre-filtration and improving the system's stability and fugitive emission capacity.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- EAST CHINA ENGINEERING SCIENCE AND TECHNOLOGY CO LTD
- Filing Date
- 2025-08-15
- Publication Date
- 2026-07-07
AI Technical Summary
Existing landfill gas and leachate drainage systems suffer from complex structures, frequent leaks, and high subsequent treatment loads, making it difficult to meet the requirements for fugitive emissions.
It adopts a multi-layer guide tube structure, including inner and outer guide tubes of different diameters. The inner guide tube is covered with a filter layer, and the liquid guide tube is located inside the inner guide tube. It is equipped with a filter device and an air extraction device to realize the pre-filtration and centralized treatment of gas and liquid.
It significantly reduces the load and cost of subsequent gas treatment, prevents particulate matter blockage, improves the operational stability of the exhaust system, meets the requirements for fugitive emissions, and reduces odor and secondary pollution.
Smart Images
Figure CN224468521U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of hazardous waste disposal technology, and more specifically, to a landfill drainage system. Furthermore, this utility model also relates to a rigid landfill including the aforementioned landfill drainage system. Background Technology
[0002] With the development of the domestic economy, the amount of hazardous waste generated is gradually increasing. In order to avoid the resulting secondary pollution problems, rigid landfills are being used more and more widely.
[0003] In conventional rigid landfills, the gas drainage system and leachate drainage system are set up independently. The gas drainage system uses gabions to discharge leachate from the top of the landfill area. Conventional gas-guiding gabions are large in volume and occupy a lot of space. Generally speaking, although the amount of leachate in rigid landfills is less than that in flexible landfills, the method of guiding leachate through pipes at the bottom of the leachate reservoir makes the structure and construction of the leachate drainage system relatively complex. This structure requires the pre-embedded sleeve at the bottom of the reservoir area, and the construction requirements for the geomembrane and drainage pipes are high. Leakage often occurs during leachate drainage, and the discharged gas often lacks pretreatment, relying solely on subsequent tail gas treatment equipment, which increases the treatment load of the equipment and makes it difficult to meet the requirements of landfills with fugitive emissions.
[0004] In conclusion, how to improve the drainage effect of waste gas and waste liquid from landfills is a problem that urgently needs to be solved by those skilled in the art. Utility Model Content
[0005] In view of this, the purpose of this utility model is to provide a landfill drainage system that can reduce the load and cost of subsequent gas treatment, and the multi-layer drainage pipe structure can effectively improve the operational stability of the drainage system.
[0006] Another objective of this invention is to provide a rigid landfill including the aforementioned landfill drainage system.
[0007] To achieve the above objectives, this utility model provides the following technical solution:
[0008] A landfill drainage system is provided for a landfill, the landfill comprising landfill cells, each landfill cell having a landfill sealing layer at its top. The drainage system includes:
[0009] At least two guide pipes of different diameters are arranged sequentially with a preset gap and placed in the landfill cell. One end of the innermost guide pipe extends out of the landfill sealing layer to communicate with the outside and is equipped with a filter device. The guide pipe is evenly distributed with air holes.
[0010] A liquid guide tube is located inside the innermost layer of the drainage tube and contacts the bottom of the landfill cell. The end of the liquid guide tube away from the landfill cell extends out of the drainage tube and is connected to the outside.
[0011] Furthermore, in this invention, at least two of the guide pipes include an inner guide pipe and an outer guide pipe, and the ends of the inner and outer guide pipes located within the landfill cell are both covered with a filter layer.
[0012] Furthermore, the material of the filter layer covering the inner drainage pipe is one or more combinations of PP, PTFE and nylon, and the material of the filter layer covering the outer drainage pipe is geotextile.
[0013] Furthermore, in this invention, one end of the inner guide pipe extending out of the landfill sealing layer is sealed by an end cap, the end cap being provided with an observation port, and the inner guide pipe being provided with a level gauge.
[0014] Furthermore, this utility model also includes a water pumping device, wherein one end of the liquid guide tube passes through the end cap and is connected to the water pumping device.
[0015] Furthermore, this utility model also includes an air extraction device, wherein an exhaust pipe is provided at one end of the inner layer guide pipe extending out of the landfill sealing layer, and the end of the exhaust pipe away from the inner layer guide pipe is connected to the air extraction device, and the filter device is located in the exhaust pipe.
[0016] Furthermore, the filter device includes a filter tube, the end of which is sealed to the exhaust pipe via a flange, and both ends of the filter tube are provided with filter baffles.
[0017] Furthermore, the filtration device further includes an adsorbent material, which is filled inside the filter tube and located between the two filter baffles.
[0018] Furthermore, the bottom of the landfill cell is provided with a water collection trough, and the inner drainage pipe, the outer drainage pipe and the liquid guiding pipe all extend into the water collection trough and contact the bottom of the water collection trough.
[0019] A rigid landfill includes several landfill cells and a landfill drainage system as described above, wherein the drainage system is located within each landfill cell. The landfill drainage system provided by this invention includes at least two drainage pipes and a liquid-conducting pipe of different diameters. The at least two drainage pipes are sequentially nested at a predetermined gap within the landfill cell, meaning that multiple layers of drainage pipes are arranged in a nested manner. Each drainage pipe has evenly distributed venting holes, and one end of the innermost drainage pipe extends out of the landfill sealing layer to communicate with the outside and is equipped with a filter. The liquid-conducting pipe is located inside the innermost drainage pipe and contacts the bottom of the landfill cell. The end of the liquid-conducting pipe away from the landfill cell extends out of the drainage pipe, allowing the permeate in the landfill to be drained through the liquid-conducting pipe. The system collects and processes gas centrally. Therefore, gas from the landfill enters the drainage pipe through vents, then passes through the innermost layer for external discharge. Before discharge, the gas passes through a filtration device, pre-filtering the exhaust gas and reducing the load and cost of subsequent gas treatment. For landfills meeting fugitive emission requirements, this device significantly reduces odor and secondary pollution during production. Furthermore, the multi-layer drainage pipe structure protects the innermost pipe, effectively preventing particulate matter from entering and causing blockages that could affect the leachate drainage system's operation, thus significantly improving the system's operational stability.
[0020] This utility model also provides a rigid landfill including the above-mentioned landfill drainage system, which has the above-mentioned beneficial effects. Attached Figure Description
[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.
[0022] Figure 1 This is a schematic diagram of the structure of the guide system provided by this utility model when in use;
[0023] Figure 2 This is a structural schematic diagram of the cross-section of the guide pipe provided by this utility model;
[0024] Figure 3 This is a partial structural schematic diagram of the filtration device provided by this utility model;
[0025] Figure 4 This is a schematic diagram of the landfill layout provided by this utility model.
[0026] Figures 1-4In the accompanying drawings, the reference numerals include:
[0027] 1. Filler cell; 2. Filler sealing layer; 3. Drainage pipe; 301. Inner drainage pipe; 302. Outer drainage pipe; 4. Filter device; 401. Adsorbent material; 402. Filter baffle; 403. Filter tube; 5. Liquid guide pipe; 6. Filter layer; 7. End cap; 8. Observation port; 9. Liquid level gauge; 10. Vent pipe; 11. Water collection tank. Detailed Implementation
[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0029] The core of this invention is to provide a landfill drainage system that can reduce the load and cost of subsequent gas treatment, and the multi-layer drainage pipe structure can effectively improve the operational stability of the drainage system.
[0030] Another core aspect of this invention is to provide a rigid landfill that includes the aforementioned landfill drainage system.
[0031] Please refer to Figure 1 A drainage system for a landfill, the landfill including a landfill cell 1, the landfill cell 1 having a landfill sealing layer 2 at the top, the drainage system including at least two drainage pipes 3 and a liquid guiding pipe 5 of different diameters, the at least two drainage pipes 3 being nested in sequence at a preset gap and located inside the landfill cell 1, one end of the innermost drainage pipe 301 extending out of the landfill sealing layer 2 to communicate with the outside, and having a filter device 4, the drainage pipes 3 having evenly distributed vent holes, the liquid guiding pipe 5 being located inside the innermost drainage pipe 3 and in contact with the bottom of the landfill cell 1, the end of the liquid guiding pipe 5 away from the landfill cell 1 extending out of the drainage pipe 3 and communicating with the outside.
[0032] It should be noted that the embodiments of this utility model can be applied not only to landfills, but also to other situations with requirements for emitting gas and filtrate, such as storage structures.
[0033] In addition, the gap between the multi-layer guide pipes 3 in this embodiment of the present invention can be determined according to the actual use situation, for example, the gap can be 5cm-20cm.
[0034] In addition, the landfill sealing layer 2 set on the upper part of the landfill in this embodiment is a common structure, which is used to prevent gas from leaking out of the landfill.
[0035] To improve the stability of the drainage pipe 3, optionally, in some embodiments, the drainage pipe 3 has a number of support rods evenly distributed along its axial direction, perpendicular to its axis, and the other end of the support rods is fixedly connected to the side wall of the landfill.
[0036] Optionally, in some embodiments, the pore size of the air passage is 8-18 mm and the porosity is 10-30%.
[0037] Optionally, in some embodiments, the number of multi-layer drainage pipes 3 can be determined according to the actual situation. Specifically, it can be determined according to the size of the landfill. When the size of the landfill is larger, the drainage effect can be enhanced by increasing the number of drainage pipes 3, such as three or four pipes. Alternatively, the drainage effect can be improved by increasing the number of the entire drainage system.
[0038] Optionally, in some embodiments, the conduit 3 may be made of materials such as HDPE, PVC, or PPR.
[0039] In use, the drainage system includes at least two drainage pipes 3 of different diameters and a liquid-conducting pipe 5. The at least two drainage pipes 3 are nested sequentially at a predetermined gap within the landfill cell 1. That is, multiple layers of drainage pipes 3 are arranged in a nested manner, and each drainage pipe 3 has evenly distributed venting holes. One end of the innermost drainage pipe 301 extends out of the landfill sealing layer 2 to communicate with the outside and is equipped with a filter device 4. The liquid-conducting pipe 5 is located inside the innermost drainage pipe 3 and contacts the bottom of the landfill cell 1. The end of the liquid-conducting pipe 5 away from the landfill cell 1 extends out of the drainage pipe 3. The liquid-conducting pipe 5 collects the leachate within the landfill. The gas in the landfill enters the drainage pipe 3 through the vent hole and is discharged to the outside through the innermost layer. The gas passes through the filter device 4 between the discharge and the outside discharge, which pre-filters the exhaust gas and reduces the load and cost of subsequent gas treatment. For landfills that meet the requirements for fugitive emissions, this device can significantly reduce odor and secondary pollution problems during production. In addition, the multi-layer drainage pipe 3 structure can protect the innermost drainage pipe 301, which can effectively prevent particulate matter from entering the innermost drainage pipe 301 and avoid blockage, thereby affecting the operation of the leachate drainage system and effectively improving the operational stability of the drainage system.
[0040] Please refer to Figure 1In some embodiments, at least two drainage pipes 3 include an inner drainage pipe 301 and an outer drainage pipe 302. The inner drainage pipe 301 and the outer drainage pipe 302 are both covered with a filter layer 6 at one end located in the landfill cell 1. That is, in this embodiment, there are two drainage pipes 3, namely an inner drainage pipe 301 and an outer drainage pipe 302. In use, by covering the inner drainage pipe 301 and the outer drainage pipe 302 with a filter layer 6, the gas and leachate entering the outer drainage pipe 302 and the inner drainage pipe 301 can be filtered, which can effectively increase its pretreatment function.
[0041] Optionally, in some embodiments, the material of the filter layer 6 covering the inner drainage pipe 301 is PE filter cloth, and the material of the filter layer 6 covering the outer drainage pipe 302 is geotextile. That is to say, geotextile is used to increase the protection effect on the drainage pipe 3.
[0042] Optionally, in some embodiments, the thickness of the geotextile is 0.2 to 2.0 mm.
[0043] Optionally, in some embodiments, the material of the filter layer 6 covering the inner conduit 301 is one or more of PE, PP, PTFE and nylon.
[0044] In the above embodiments, the total thickness of the filter layer 6 covering the inner guide pipe 301 is 2.0~5.0mm.
[0045] Optionally, in some embodiments, in order to further avoid blockage of the guide pipe 3, a rotating structure, such as a bearing, can be provided on the landfill sealing layer 2, and the guide pipe 3 can be connected to the inner ring of the bearing. By controlling the rotation of the guide pipe 3 by a motor, the blockage of the air passage of the guide pipe 3 at the same position can be avoided, which greatly improves its performance.
[0046] Please refer to Figure 1 In some embodiments, the end of the inner drainage pipe 301 that extends out of the landfill sealing layer 2 is sealed by an end cap 7. The end cap 7 is provided with an observation port 8, and the inner drainage pipe 301 is provided with a level gauge 9. The observation port 8 facilitates the observation of the internal permeate, while the level gauge 9 not only allows the observer to read the value accurately, but also allows the information to be remotely transmitted to the control system or mobile terminal via electrical or network signals, making it more convenient for the observer to carry out monitoring work.
[0047] Optionally, in some embodiments, one end of the liquid guide tube 5 passes through the end cap 7 and is connected to a water pump, which is a water pump, specifically a rotor pump or a centrifugal pump.
[0048] Please refer to Figure 1In some embodiments, the inner layer drain pipe 301 is provided with an exhaust pipe 10 at one end extending out of the landfill sealing layer 2. The end of the exhaust pipe 10 away from the inner layer drain pipe 301 is connected to the air extraction device. The filter device 4 is located in the exhaust pipe 10. That is to say, this system extracts the gas generated inside the landfill through the air extraction device and filters it through the filter device 4 during the extraction process to achieve pretreatment and reduce the difficulty of subsequent centralized gas treatment.
[0049] In the above embodiments, the air extraction device can be an air pump, specifically an axial flow fan or a centrifugal fan.
[0050] Please refer to Figure 3 In some embodiments, the filter device 4 includes a filter tube 403, the end of which is sealed to the exhaust pipe 10 via a flange, and both ends of the filter tube 403 are provided with filter baffles 402.
[0051] Optionally, in some embodiments, the filter device 4 further includes an adsorbent material 401, which is filled in the filter tube 403 and located between the two filter baffles 402. That is, the baffles can not only filter the gas alone, but also limit the adsorbent material 401 and filter the gas simultaneously with the adsorbent material 401.
[0052] In the above embodiment, the diameter of the sealing plate is the same as the diameter of the flange, and bolt holes with the same holes as the flange are opened on the sealing plate to fix it to the filter pipe 403 through the flange.
[0053] Optionally, in some embodiments, the porosity of the baffle is 55% to 85%, and the opening size is 2 to 8 mm.
[0054] Optionally, in some embodiments, the adsorbent 401 is one or a combination of activated silicon, activated carbon, activated alumina, etc.
[0055] Please refer to Figure 1 In some embodiments, a water collection tank 11 is provided at the bottom of the landfill cell 1. The inner drainage pipe 301, the outer drainage pipe 302 and the liquid guide pipe 5 all extend into the bottom of the water collection tank 11. That is to say, the water collection tank 11 is used to collect the permeate in the landfill so that the liquid guide pipe 5 can extract it.
[0056] Optionally, in some embodiments, the water collection tank 11 is located at the bottom of the landfill, and the bottom of the landfill is an inclined surface that slopes toward the water collection tank 11.
[0057] Optionally, in some embodiments, the bottom of the water collection tank 11 is paved with pebbles with a particle size of 25-60 mm.
[0058] Optionally, in some embodiments, the CaCO3 content of the pebbles at the bottom of the water collection tank 11 does not exceed 10%.
[0059] Please refer to Figure 4 A rigid landfill, the rigid landfill comprising a plurality of landfill cells 1, and the landfill drainage system, the landfill drainage system being disposed within the landfill cells 1.
[0060] In other words, the key point of this utility model is: it provides multiple layers of drainage pipes 3 arranged in a nested manner, with vent holes evenly distributed on the drainage pipes 3. One end of the innermost drainage pipe 301 extends out of the landfill sealing layer 2 to communicate with the outside and is equipped with a filter device 4. The liquid guide pipe 5 is located inside the innermost drainage pipe 3 and contacts the bottom of the landfill cell 1. The end of the liquid guide pipe 5 away from the landfill cell 1 extends out of the drainage pipe 3. The liquid guide pipe 5 is used to collect and centrally treat the leachate in the landfill. Therefore, the gas in the landfill will enter the drainage pipes through the vent holes. Within the innermost layer, the exhaust gas is discharged externally. Between the exhaust gas and the filter device 4, the exhaust gas is pre-filtered, which can reduce the load and cost of subsequent gas treatment. For landfills that meet the requirements for fugitive emissions, this device can significantly reduce odor and secondary pollution problems during production. In addition, the multi-layer drainage pipe 3 structure can protect the innermost drainage pipe 301, which can effectively prevent particulate matter from entering the innermost drainage pipe 301, avoid blockage, and thus affect the operation of the leachate drainage system, effectively improving the operational stability of the drainage system.
[0061] In addition to the landfill drainage system disclosed in the above embodiments, this utility model also provides a rigid landfill including the above landfill drainage system. For the structure of other parts of the rigid landfill, please refer to the prior art, which will not be described in detail here.
[0062] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.
[0063] The above provides a detailed description of a landfill drainage system and a rigid landfill provided by this utility model. Specific examples have been used to illustrate the principles and implementation methods of this utility model. The descriptions of the embodiments above are merely for the purpose of helping to understand the method and core ideas of this utility model. It should be noted that those skilled in the art can make various improvements and modifications to this utility model without departing from its principles, and these improvements and modifications also fall within the protection scope of this utility model.
Claims
1. A landfill drainage system for a landfill, the landfill comprising landfill cells (1), wherein the landfill cells (1) are provided with a landfill sealing layer (2) at the top, characterized in that, The drainage system includes: At least two guide pipes (3) of different diameters are arranged in sequence with a preset gap and placed in the landfill cell (1). One end of the innermost guide pipe (3) extends out of the landfill sealing layer (2) to communicate with the outside and is provided with a filter device (4). The guide pipe (3) is evenly distributed with air holes. The liquid guide tube (5) is located inside the innermost layer of the guide tube (3) and is in contact with the bottom of the landfill cell (1). The end of the liquid guide tube (5) that is away from the landfill cell (1) extends out of the guide tube (3) and is connected to the outside.
2. The landfill drainage system according to claim 1, characterized in that, At least two of the drainage pipes (3) include an inner drainage pipe (301) and an outer drainage pipe (302), and the inner drainage pipe (301) and the outer drainage pipe (302) are both covered with a filter layer (6) at one end inside the landfill cell (1).
3. The landfill drainage system according to claim 2, characterized in that, The material of the inner drainage pipe (301) covered by the filter layer (6) is one or more of PP, PTFE and nylon, and the material of the outer drainage pipe (302) covered by the filter layer (6) is geotextile.
4. The landfill drainage system according to claim 3, characterized in that, The inner layer drain pipe (301) extends out of the landfill sealing layer (2) and is sealed by an end cap (7). An observation port (8) is provided on the end cap (7), and a level gauge (9) is provided on the inner layer drain pipe (301).
5. The landfill drainage system according to claim 4, characterized in that, It also includes a pumping device, one end of the liquid guide tube (5) passes through the end cap (7) and is connected to the pumping device.
6. The landfill drainage system according to claim 2, characterized in that, It also includes an air extraction device, and an exhaust pipe (10) is provided at one end of the inner layer guide pipe (301) that extends out of the landfill sealing layer (2). The end of the exhaust pipe (10) away from the inner layer guide pipe (301) is connected to the air extraction device, and the filter device (4) is located at the exhaust pipe (10).
7. The landfill drainage system according to claim 6, characterized in that, The filter device (4) includes a filter tube (403), the end of which is sealed to the exhaust pipe (10) via a flange, and both ends of the filter tube (403) are provided with filter baffles (402).
8. The landfill drainage system according to claim 7, characterized in that, The filtration device (4) further includes an adsorbent material (401) which is filled in the filter tube (403) and located between the two filter baffles (402).
9. The landfill drainage system according to any one of claims 2-8, characterized in that, The bottom of the landfill cell (1) is provided with a water collection tank (11), and the inner drainage pipe (301), the outer drainage pipe (302) and the liquid guide pipe (5) all extend into the water collection tank (11) and are in contact with the bottom of the water collection tank (11).
10. A rigid landfill, the rigid landfill comprising a plurality of landfill cells (1), characterized in that, It also includes the landfill drainage system according to any one of claims 1-9, wherein the landfill drainage system is located within the landfill cell (1).