Multi-layered anti-seepage structure of landfill and its integrated leachate treatment system

Abstract

The application discloses a landfill multi-layer anti-seepage structure and a seepage liquid comprehensive treatment system thereof. The multi-layer anti-seepage structure comprises a foundation pit, and a plurality of anti-seepage layers are arranged on the side wall of the foundation pit. The anti-seepage layers comprise, in sequence from the side wall of the foundation pit to the outside, a xanthan gum / coconut shell fiber composite anti-seepage layer, a waterproof material layer, an electro-osmotic anti-seepage layer and a barrier layer. The xanthan gum / coconut shell fiber composite anti-seepage layer is prepared by stirring and mixing xanthan gum, coconut shell fiber and soil. One end of a water collecting pipe is communicated with the electro-osmotic anti-seepage layer, and the other end is communicated with the outside. An inflatable cushion layer is arranged at the bottom of the foundation pit. A control system is connected with the electro-osmotic anti-seepage layer and the inflatable cushion layer. The treatment system comprises the multi-layer anti-seepage structure and a seepage liquid treatment system for treating seepage liquid. The three-layer anti-seepage structure is used to effectively enhance the stability and anti-seepage property of the composite layer, reduce the possibility of liquid in the garbage penetrating into the soil, and control the multi-layer anti-seepage structure through the control system.

Description

Technical Field

[0001] This invention relates to a landfill seepage prevention structure and its integrated treatment system, and more particularly to a multi-layer seepage prevention structure for a landfill and its integrated leachate treatment system. Background Technology

[0002] With the acceleration of urbanization and the continuous growth of its population, China has entered a period of rapid development. While enjoying the benefits it brings, the problem of garbage pollution has also arisen. Statistics show that China generates more than 150 million tons of domestic waste annually, and this massive amount of waste places serious pressure and challenges on the environment. Landfills, as the main method of disposing of domestic waste and industrial waste, have solved the garbage pollution problem in the short term, but the leachate generated during their operation will lead to a series of more serious pollution problems such as groundwater pollution, air pollution, and soil degradation, seriously endangering ecosystems and human health.

[0003] Traditional landfills employ various impermeable structures to prevent liquids from seeping into the soil and causing pollution. These structures primarily utilize adsorption and blocking methods. However, in actual use, the uneven accumulation of waste can lead to uneven settlement, which often damages the impermeable layer, particularly severely affecting the integrity of the geomembrane and other protective layers. This uneven settlement can cause cracks or partial detachment of the geomembrane, allowing leachate to seep into the groundwater system and compromising the impermeability.

[0004] Furthermore, over time, the seepage prevention effect of the impermeable structure gradually weakens, eventually leading to failure. This necessitates significant manpower and resources for maintenance and replacement, undoubtedly increasing the operating costs of the landfill. To address these issues, this invention proposes an intelligent landfill pollution control system. This system aims to improve the stability and long-term effectiveness of the impermeable layer through more refined design and intelligent control, reducing the impact of uneven settlement on the impermeable layer and lowering maintenance costs. Summary of the Invention

[0005] Purpose of the invention: The purpose of this invention is to provide a multi-layered impermeable structure for landfills that can improve the stability and long-term effectiveness of the impermeable layer and reduce the impact of uneven settlement on the impermeable layer;

[0006] The second objective of this invention is to provide a comprehensive treatment system for landfill leachate.

[0007] Technical Solution: The multi-layered anti-seepage structure for landfills of the present invention includes a foundation pit. The sidewalls of the foundation pit are provided with multiple anti-seepage layers. These multiple anti-seepage layers, arranged sequentially from near to far from the sidewalls of the foundation pit, include a xanthan gum / coconut shell fiber composite anti-seepage layer, a waterproof material layer, an electro-osmotic anti-seepage layer, and a barrier layer. The xanthan gum / coconut shell fiber composite anti-seepage layer is prepared by mixing xanthan gum, coconut shell fiber, and soil, and is used to prevent seepage and inhibit uneven settlement of waste. The electro-osmotic anti-seepage layer contains negative and positive electrode wires for... Under the action of electric current, water molecules are drawn from the capillaries inside the structure to the outside, preventing water from the outside from entering the inside; one end of the water collection pipe is connected to the electro-osmotic anti-seepage layer, and the other end is connected to the outside; an inflatable cushion layer is laid at the bottom of the foundation pit, the inflatable cushion layer includes several horizontally arranged inflatable cushion layer unit cavities, and each inflatable cushion layer unit cavity is equipped with a settlement sensing device and an air control valve; an air supply pipe is connected to the air control valve in each inflatable cushion layer unit cavity; the control system is connected to the electro-osmotic anti-seepage layer and the inflatable cushion layer.

[0008] The xanthan gum accounts for 0.5-2% of the soil mass, and the coconut fiber accounts for 2-4% of the soil mass.

[0009] The barrier layer located outside the electro-osmotic seepage prevention layer is an air-filled cushion layer.

[0010] The positive wire is nested outside the negative wire, and the positive and negative wires are spirally wound together. The positive and negative wires are connected to the positive and negative terminals of the power supply, respectively, and the control system is connected to the positive and negative terminals of the power supply.

[0011] The control system is connected to the settlement sensing device and the pneumatic valve, and is used to control the opening of the corresponding pneumatic valve according to the pressure value in the cavity of each inflatable cushion unit to prevent settlement.

[0012] The pit contains several layered isolation plates arranged vertically, with adjacent layered isolation plates supported by support columns.

[0013] The control system includes an intelligent integrated terminal, a user receiving terminal, and an integrated expansion module; the integrated expansion module includes a sensing module, an execution module, and a processing module.

[0014] The landfill leachate integrated treatment system of the present invention includes the above-mentioned multi-layer anti-seepage structure of the landfill, and a leachate treatment system connected to the water collection pipe in the multi-layer anti-seepage structure of the landfill for treating leachate.

[0015] The seepage treatment system includes a preliminary treatment tank and a deep treatment tank. The preliminary treatment tank is equipped with a solid-liquid separation membrane and a pump connected to a water collection pipe. Above the solid-liquid separation membrane, there is a delivery pipe connected to the deep treatment tank. The top of the deep treatment tank is equipped with several automatic feeders for storing different wastewater treatment materials, and the lower end of the deep treatment tank is connected to a drain pipe.

[0016] The leachate treatment system also includes several automatic detection devices for detecting the content of different pollutants in the wastewater. The receiving end of the automatic detection device is connected to the output end of the water pump installed in the deep treatment tank.

[0017] The deep treatment tank is equipped with an aerator on its side wall, and the output end of the aerator is connected to an aerator pipe extending into the deep treatment tank.

[0018] The liquid delivery pipe is equipped with a first electrically controlled valve, and the liquid discharge pipe is equipped with a second electrically controlled valve.

[0019] Invention Principle: The xanthan gum / coconut shell fiber composite impermeable layer of the present invention works through the following mechanisms: (1) Hydrogen bonding and physical adsorption: The hydrophilic groups of xanthan gum (such as hydroxyl, carboxyl, etc.) can form hydrogen bonds with the hydroxyl groups in coconut shell fiber, increasing the adhesion between the two. This hydrogen bond connection helps to enhance the bonding force between xanthan gum and coconut shell fiber, thereby improving the stability of the composite material. The rough structure on the surface of coconut shell fiber provides more physical adsorption sites, where xanthan gum molecules can be adsorbed and fixed to form a strong composite structure. (2) Formation of composite network: When xanthan gum forms a network structure under the action of water, coconut shell fiber acts as a reinforcing agent, increasing the strength of its network structure through interaction with xanthan gum. The composite structure formed by fiber and xanthan gum effectively improves the impermeability of soil. This composite structure not only improves the compactness of soil, but also makes the expansion and waterproof properties of xanthan gum more significant. Coconut shell fiber increases the mechanical strength of the material by providing support in the composite material, preventing cracks from occurring under the action of landfill settlement or external pressure. (3) Formation of microporous structure: After the coconut shell fiber is combined with xanthan gum, it can form a fine pore and channel structure at the microscopic level. These microporous structures help prevent water from directly penetrating into the soil, further improving the waterproofing effect. The hydration and swelling properties of xanthan gum make these pores even tighter after absorbing water, further increasing the seepage prevention effect. (4) Complementary effect: Hydration property of xanthan gum: The hydrophilicity and swelling properties of xanthan gum effectively reduce soil permeability and play a major role in waterproofing. Reinforcing effect of coconut shell fiber: Coconut shell fiber provides physical support, enhances the tensile and compressive strength of the composite material, and ensures that xanthan gum is not easily broken or failed during the waterproofing process.

[0020] The first layer of the xanthan gum / coconut fiber composite geotextile layer in this invention enhances the soil's impermeability, acting as the first barrier to prevent leachate from entering the groundwater system. By reducing soil permeability, it reduces the pressure and impact of water on the second layer of HDPE membrane. The first reinforcing layer absorbs some external pressure or leachate pressure, reducing membrane stretching and stress concentration, thereby extending the HDPE membrane's service life. The second waterproof material layer, where the HDPE membrane directly contacts the electroosmotic layer, effectively regulates the leachate flow direction through the electroosmotic effect or electric field, reducing the seepage path and thus enhancing the overall impermeability. The third electroosmotic geotextile layer, by controlling and adjusting the electric field and flow of the leachate, helps reduce osmotic pressure on the membrane, slowing the water flow through the membrane, thereby reducing membrane pressure and potential damage. Simultaneously, the electroosmotic geotextile layer guides the movement and distribution of the leachate, forming a dual-barrier system in conjunction with the HDPE membrane's impermeability. This allows for stricter control of leachate flow between different layers, further improving the overall impermeability system's effectiveness.

[0021] Beneficial effects: Compared with the prior art, the present invention achieves the following significant effects:

[0022] (1) This invention, through the setting of a multi-layered impermeable structure, combines xanthan gum and coconut shell fiber with the soil to form a composite layer, which can effectively enhance the stability and impermeability of the composite layer, reduce damage caused by uneven settlement and liquid infiltration, and utilize the principle of water electroosmosis to regulate low-pressure pulse charge, ionize the infiltrated liquid, and actively guide water molecules from the capillaries in the reinforced concrete layer to the outside of the structure, reducing the possibility of liquid infiltration from the waste into the soil. The multi-layered impermeable structure is controlled by a control system to achieve intelligent control. (2) Regarding the xanthan gum / coconut shell fiber composite impermeable layer of this invention, the hydrophilic groups of xanthan gum (such as hydroxyl, carboxyl, etc.) can undergo hydrogen bonding with the hydroxyl groups in coconut shell fiber, increasing the adhesion between the two. At the same time, when xanthan gum forms a network structure under the action of water, coconut shell fiber acts as a reinforcing agent, increasing the strength of its network structure through interaction with xanthan gum. The use of this composite material can effectively enhance the stability and impermeability of the composite layer, and reduce damage caused by uneven settlement and liquid infiltration. (3) In this invention, a seepage treatment system is used to treat the seepage. The seepage treatment system uses an automatic detection device to detect the sewage and, based on the detection results, feeds in an appropriate amount of treatment material through an automatic feeder. Then, the treatment material is aerated to fully treat the sewage, thereby treating the seepage and avoiding soil pollution. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the multi-layer seepage-proof structure of the present invention;

[0024] Figure 2This is a schematic diagram of the negative electrode conductor of the present invention;

[0025] Figure 3 This is a schematic diagram of the positive electrode wire of the present invention;

[0026] Figure 4 This is a diagram of the seepage fluid treatment system of the present invention;

[0027] Figure 5 This is a control system diagram of the present invention;

[0028] Figure 6 This is a schematic diagram illustrating the mechanism of action of coconut shell fiber in this invention;

[0029] Figure 7 The stress-strain curves for different coconut shell fiber lengths are shown in this invention. Detailed Implementation

[0030] The present invention will now be described in further detail.

[0031] like Figure 1-3 As shown, this invention provides a multi-layered anti-seepage structure for a landfill, including a foundation pit. The pit's sidewalls are provided with multiple anti-seepage layers, which, in order of proximity to the pit's sidewalls, include a xanthan gum / coconut fiber composite anti-seepage layer 1, a waterproof material layer 2, an electro-osmotic anti-seepage layer 3, and a barrier layer. The xanthan gum / coconut fiber composite anti-seepage layer 1 is prepared by mixing xanthan gum, coconut fiber, and soil, and is used to prevent seepage and inhibit uneven settlement of waste. The electro-osmotic anti-seepage layer 3 is internally laid with negative electrode wires 12 and positive electrode wires 13, used to draw water molecules from the capillaries within the structure under the influence of an electric current. The water flows out of the structure and prevents water from the outside from entering the inside; one end of the water collection pipe 6 is connected to the electro-osmotic seepage prevention layer 3, and the other end is connected to the outside; an inflatable cushion layer 8 is laid at the bottom of the foundation pit. The inflatable cushion layer 8 includes several horizontally arranged inflatable cushion layer unit cavities. A settlement sensing device 7 and an air control valve 9 are provided in the inflatable cushion layer unit cavity; an air supply pipe 10 is connected to the air control valve 9 in each inflatable cushion layer unit cavity; the control system 11 is connected to the settlement sensing device 7 and the air control valve 9 and is used to control the opening of the corresponding air control valve according to the pressure value in each inflatable cushion layer unit cavity to prevent settlement.

[0032] In the xanthan gum / coconut shell fiber composite geomembrane of this invention, the mass of xanthan gum is 1% of the soil mass, and the mass of coconut shell fiber is 2-4% of the soil mass. In this embodiment, the xanthan gum / coconut shell fiber composite geomembrane is formed by uniformly mixing 1.5% xanthan gum (by mass of soil), 2.0% coconut shell fiber (by mass of soil), and soil. This xanthan gum / coconut shell fiber composite geomembrane utilizes coconut shell fiber as an "anchor," and at a suitable ratio of coconut shell fiber to soil, the coconut shell fiber and soil interweave to form a three-dimensional network structure, thereby enhancing the strength and stability of the entire system. Furthermore, the mesh significantly reduces soil settlement, thereby greatly reducing geomembrane cracking or localized detachment caused by uneven settlement, and significantly improving the geomembrane's seepage prevention effect.

[0033] Reference Figure 6 The strengthening mechanism of coconut husk fiber in soil is as follows: soil with added coconut husk fiber is called reinforced soil, and soil without added coconut husk fiber is called unreinforced soil. For unreinforced soil, it undergoes layered compaction before molding, compressing the voids in the soil. Therefore, in a microscopic state, soil particles are mainly in surface contact, and the particles are discretely distributed, such as... Figure 6 As shown in (a) of the diagram. In reinforced soil, the addition of coconut fiber to the soil mass allows the coconut fiber to connect with soil particles, thereby reinforcing the soil particles and strengthening the bond between them. As the degree of reinforcement by coconut fiber increases, the restraining force provided by the coconut fiber also begins to increase, such as... Figure 6 (b) and Figure 6 As shown in (c) above. When the optimal value is reached, the coconut shell fibers are evenly distributed in the soil, and the fibers can interweave to form a three-dimensional "anchor" spatial system. The local reinforcement formed by soil particles and coconut shell fibers, together with the three-dimensional "anchor" spatial system, work together to reinforce the soil particles and enhance the overall integrity of the soil, as shown in (c). Figure 6 As shown in (c). When the reinforcement exceeds this optimal value, the coconut shell fibers tend to aggregate or bend, preventing most of the fibers from contacting the soil particles and thus failing to fully exert the reinforcement effect. This disrupts the three-dimensional "anchor" spatial system, resulting in a decrease in strength, such as... Figure 6 As shown in (d) in the table below, the unconfined compressive strength of soil samples with different xanthan gum contents is shown in Table 1.

[0034] Table 1 Unconfined compressive strength of soil samples with different xanthan gum contents.

[0035]

[0036] As can be seen from Table 1, the unconfined compressive strength of the soil sample reaches its maximum value when the xanthan gum content is 1.5%. (This is a summary of Table 1 and...) Figure 6In the xanthan gum and coconut fiber composite layer 1, 1.5% xanthan gum and 2.0% coconut fiber are uniformly mixed with the soil to form a composite layer.

[0037] Depend on Figure 7 It can be seen that when the axial strain is small, the curves of reinforced soil and unreinforced soil are similar, and the reinforcement effect is not apparent. When the axial strain reaches about 9%, the unreinforced soil begins to fail, while the curve of the reinforced soil is still in the rising stage, indicating that reinforcement can effectively increase the soil strength. Comparing the effects of different reinforcement lengths at the same content, the unconfined compressive strength of the reinforced soil reaches its maximum when the coconut shell fiber length is 5cm. As the fiber length further increases to 8cm, the unconfined compressive strength of the reinforced soil decreases by 41% compared to when the coconut shell fiber length is 5cm, and its curve slope is also lower than that of the unreinforced soil. Considering that the longer fibers are prone to aggregation under the action of intermolecular hydrogen bonds, thus affecting the reinforcement effect, a coconut shell fiber content of 2.0% + 5cm was selected as the additive material.

[0038] The waterproof material layer 2 of this invention is made of waterproof materials such as high-density polyethylene (HDPE), and is referred to as the HDPE waterproof layer, which has excellent seepage prevention performance. The waterproof material layer of this invention can also be a geotextile seepage prevention layer.

[0039] In the electro-osmotic seepage-proof layer 3 of this invention, positive electrode wire 13 and negative electrode wire 12 are laid, with the positive electrode wire nested outside the negative electrode wire. The positive and negative electrode wires are spirally wound together. The positive and negative electrode wires are respectively connected to the positive and negative terminals of the power supply in the control system. The positive electrode wire 13 and the negative electrode wire 12 are both controlled by the power supply in the control system 11, which changes the current magnitude. According to the principle of water electro-osmosis, the negative electrode wire 12 and the positive electrode wire 13 cooperate with each other. The control system 11 can adjust the low-voltage pulse charge to ionize the seepage liquid and actively guide water molecules from the capillaries inside the structure to the outside of the structure, that is, to the negative electrode direction on the water-facing side. This prevents water from the outside from entering the inside and seeping into the soil to cause pollution, effectively blocking water from entering the soil and keeping water molecules away from the soil.

[0040] The electro-osmotic seepage barrier layer 3 of this invention has an inflatable cushion layer 8 at its lower end. The inflatable cushion layer 8 includes several inflatable cushion layer units, each of which is equipped with a settlement sensing device 7. When the upper soil settles, the upper settlement plate moves downward. The control system 11 identifies the magnitude of the settlement plate displacement and opens the pneumatic control valve 9. Gas enters different inflatable cushion layer units through the gas supply pipe 10, causing the inflatable cushion layer units to expand, adjusting the elasticity and pressure of the cushion layer, preventing further expansion of upper settlement, effectively reducing the compression deformation of the landfill seepage barrier layer, and avoiding seepage of leachate. The pneumatic control valve of this invention is a spherical pneumatic control valve.

[0041] The barrier layer located outside the electro-osmotic seepage prevention layer of this invention is an inflatable cushion layer, which may not require a settlement sensing device or a pneumatic control valve.

[0042] The present invention provides a plurality of layered isolation plates 5 arranged vertically within the foundation pit, with adjacent layered isolation plates supported by support columns 4. The present invention employs layered treatment of waste within the impermeable layer. After a certain height of waste is buried, the layered isolation plates 5 and support columns 4 are installed to evenly transfer the weight of the upper layer to the lower layer, preventing uneven settlement caused by uneven accumulation of waste during landfilling from damaging the impermeable structure.

[0043] Example 2

[0044] Please see Figure 1 , Figure 4 and Figure 5 This embodiment provides a comprehensive landfill leachate treatment system, including the multi-layer anti-seepage structure of the landfill in Embodiment 1, and a leachate treatment system connected to the water collection pipe in the multi-layer anti-seepage structure of the landfill in Embodiment 1 for leachate treatment.

[0045] The seepage treatment system of this embodiment includes a preliminary treatment tank 14 and a deep treatment tank 15. The preliminary treatment tank 14 is equipped with a pump 16, the input end of which is connected to a collection pipe 6. When the liquid level sensor 7 detects that the liquid in the collection pipe 6 has reached a threshold, the control system controls the pump 16 to work, thereby pumping the liquid in the collection pipe 6 into the preliminary treatment tank 14. A solid-liquid separation membrane 17 is installed in the preliminary treatment tank 14. When the liquid in the preliminary treatment tank 14 reaches a certain amount, it is filtered through the solid-liquid separation membrane 17 to filter out the solid particles in the liquid. A delivery pipe 18 connects the preliminary treatment tank 14 and the deep treatment tank 15. A first electrically controlled valve 26 is installed on the delivery pipe 18. The delivery pipe 18 is located above the solid-liquid separation membrane 17. The filtered liquid enters the deep treatment tank 15 through the delivery pipe 18.

[0046] A water pump 20 is installed in the deep treatment tank 15. The output end of the water pump 20 is connected to the receiving end of multiple automatic detection devices 21 through a pipeline. The leachate treatment system also includes multiple automatic detection devices 21, which detect the content of different pollutants in the wastewater. The control system first controls the first electrically controlled valve 26 to close, so that the liquid in the preliminary treatment tank 14 cannot enter the deep treatment tank 15. Then, the control system controls the water pump 20 to work. The water pump 20 draws the liquid in the deep treatment tank 15 and delivers it to the multiple automatic detection devices 21. The multiple automatic detection devices 21 detect the content of different pollutants in the wastewater, such as COD, BOD, and ammonia nitrogen, and transmit the data to the control system in real time.

[0047] Multiple automatic feeders 19 are installed on the deep treatment tank 15, each containing different wastewater treatment materials. After the pollutant content of the liquid is detected, the detection data is sent to the control system. The control system calculates and controls the automatic feeders 19 to start, transporting the amount of treatment material corresponding to the pollutant content into the deep treatment tank 15 to treat the liquid in the deep treatment tank 15 and remove pollutants such as organic matter and heavy metals from the water.

[0048] An aerator 22 is installed on the side wall of the deep treatment tank 15. The output end of the aerator 22 is connected to an aeration pipe 23, which extends into the deep treatment tank 15. After the automatic feeder 19 delivers the material to be treated into the deep treatment tank 15, the control system starts the aerator 22. The aerator 22 aerates the liquid in the deep treatment tank 15 through the aeration pipe 23, thereby improving the mixing degree and mixing efficiency of the material and the liquid, and thus achieving the treatment of wastewater.

[0049] The lower end of the deep treatment tank 15 is connected to a drain pipe 25, and a second electrically controlled valve 24 is installed on the drain pipe 25. After the wastewater is treated by the treated material, the liquid is pumped again by the water pump 20 to the automatic detection device 21 for secondary detection. If the detection meets the standard, the second electrically controlled valve 24 is opened to discharge the treated liquid. After discharge, the second electrically controlled valve 24 is closed and the first electrically controlled valve 26 is opened again, so that the liquid in the preliminary treatment tank 14 can re-enter the deep treatment tank 15 through the liquid delivery pipe 18. If the detection does not meet the standard, the automatic feeder 19 is controlled by the control system to deliver the corresponding amount of treated material into the deep treatment tank 15 according to the pollutant content data, and the steps are repeated and the detection is repeated until the detection meets the standard, and then the treated liquid can be discharged.

Claims

1. A multi-layered impervious structure for a landfill site comprising a foundation pit, characterized in that, The foundation pit side wall is provided with a multilayer impermeable layer, which comprises, from near to far, a xanthan gum / coconut shell fiber composite impermeable layer (1), a waterproof material layer (2), an electro-osmotic impermeable layer (3), and a barrier layer in sequence. The xanthan gum / coconut shell fiber composite impermeable layer (1) is prepared by stirring and mixing xanthan gum, coconut shell fiber and soil, and is used for preventing seepage and preventing uneven settlement of garbage. The electro-osmotic impermeable layer (3) is provided with a negative electrode wire (12) and a positive electrode wire (13) inside, which are used to drain water molecules from the capillary pores inside the structure to the outside of the structure under the action of electric current, and prevent water from the outside from entering the inside. One end of a water collecting pipe (6) is in communication with the electro-osmotic impermeable layer (3), and the other end is in communication with the outside. An inflatable cushion layer (8) is arranged at the bottom of the foundation pit, and the inflatable cushion layer (8) comprises a plurality of inflatable cushion layer unit cavities arranged transversely, and the inflatable cushion layer unit cavities are provided with a settlement sensing device and an air control valve. A gas conveying pipe is in communication with the air control valve in each inflatable cushion layer unit cavity. A control system is connected with the electro-osmotic impermeable layer (3) and the inflatable cushion layer (8).

2. The multi-layered landfill liner according to claim 1, wherein, The mass of the xanthan gum is 0.5-2% of the mass of the soil, and the mass of the coconut shell fiber is 2-4% of the mass of the soil.

3. The multi-layered landfill liner according to claim 1, wherein, The barrier layer arranged outside the electro-osmotic impermeable layer (3) is an inflatable cushion layer.

4. The multi-layered landfill liner according to claim 1, wherein The positive electrode wire (13) is nested outside the negative electrode wire (12), and the positive electrode wire (13) and the negative electrode wire (12) are respectively spirally wound. The positive and negative electrode wires are respectively connected with the positive and negative poles of a power supply, and the control system is connected with the positive and negative poles of the power supply.

5. The multi-layered landfill liner according to claim 1, wherein, A plurality of layered isolation plates (5) are arranged in the foundation pit along the vertical direction, and adjacent layered isolation plates (5) are supported by support force transmission columns (4).

6. The multi-layered landfill liner according to claim 1, wherein The control system comprises an intelligent integrated terminal (27), a user receiving terminal (28), and an integrated expansion module. The integrated expansion module comprises a sensing module (29), an execution module (30), and a processing module (31).

7. A landfill leachate integrated treatment system, characterized by, A leachate treatment system for treating seepage liquid is connected to the water collecting pipe in the multilayer impermeable structure of the landfill site.

8. The landfill leachate integrated treatment system according to claim 7, wherein The leachate treatment system comprises a preliminary treatment tank (14) and a deep treatment tank (15). The preliminary treatment tank (14) is provided with a solid-liquid separation membrane (17) and a liquid pumping pump (16) in communication with the water collecting pipe (6). A liquid conveying pipe (18) in communication with the deep treatment tank (15) is arranged above the solid-liquid separation membrane (17). The top of the deep treatment tank (15) is provided with a plurality of automatic feeders (19) for storing different sewage treatment materials. The lower end of the deep treatment tank (15) is in communication with a liquid discharge pipe (25).

9. The landfill leachate integrated treatment system according to claim 7, wherein The leachate treatment system further comprises a plurality of automatic detection devices (21) for detecting the content of different pollutants in the sewage. The receiving end of the automatic detection device (21) is connected with the output end of a water pump (20) arranged in the deep treatment tank (15).

10. The landfill leachate integrated treatment system according to claim 8, wherein The side wall of the deep treatment tank (15) is provided with an air burst machine (22), and an output end of the air burst machine (22) is communicated with an air burst pipe (23) extending into the deep treatment tank (15).

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