Anti-seepage drainage system for soil remediation disposal site and application method

Abstract

The invention provides an anti-seepage drainage system for a soil remediation disposal site and an application method, and relates to the technical field of soil remediation, the anti-seepage drainage system comprises a disposal site anti-seepage subsystem arranged above an underground soil layer in the disposal site, and a water collection and drainage subsystem dug downwards around the disposal site; the site anti-seepage subsystem comprises a bottom supporting plate layer, a first flexible hydrophobic waterproof film layer and a top anti-seepage fluorescent plate layer which are sequentially laid from bottom to top. The water collection and drainage subsystem comprises site peripheral drainage ditches arranged on the periphery of the disposal site and an underground water collection pool connected with the site peripheral drainage ditches and arranged on the edge of the disposal site, the depth of the underground water collection pool is larger than that of the site peripheral drainage ditches, and second flexible hydrophobic waterproof film layers are laid in the peripheral drainage ditches and the underground water collection pool; and a bottom floating ball valve electromagnetic sewage pump is arranged at the bottom of the underground water collecting tank and is connected with a surface water treatment facility. According to the invention, the secondary pollution caused by the leachate generated by the stockpiling of the polluted soil in the treatment area is effectively prevented.

Description

Technical Field

[0001] The present invention relates to the technical field of soil remediation, and in particular to an anti-seepage drainage system for a soil remediation and disposal site and an application method thereof. Background Art

[0002] At present, the common mode of contaminated soil remediation is ex situ remediation, that is, the contaminated soil is excavated, and after planning the surface disposal site, the contaminated soil remediation construction work is carried out on the disposal site. At the same time, in order to prevent secondary pollution at the disposal site, anti-seepage measures need to be taken, usually laying a concrete layer in the disposal area.

[0003] The method of laying concrete at the contaminated soil remediation and disposal site indirectly increases the cement production of local cement companies, indirectly causing high carbon emissions, which is contrary to the promotion of green development; at the same time, solid waste is generated during the decommissioning stage, which does not meet the low-carbon and environmental protection expectations;

[0004] Based on the above problems, there is an urgent need for a low-carbon and environmentally friendly anti-seepage method for contaminated soil disposal sites. Summary of the invention

[0005] In view of the above problems, the present invention provides an anti-seepage drainage system and application method for soil remediation and disposal sites, which can effectively prevent secondary pollution caused by leachate generated by the storage of contaminated soil in the disposal area, and avoid the solid waste of concrete anti-seepage layer construction generated by traditional anti-seepage measures.

[0006] To achieve the above-mentioned object, the present invention provides an anti-seepage drainage system for a soil remediation disposal site, comprising: an anti-seepage subsystem for the disposal site arranged above the underground soil layer in the disposal site, and a water collection and drainage subsystem dug downward around the disposal site;

[0007] The site anti-seepage subsystem comprises a bottom support plate layer, a first flexible hydrophobic water-isolating membrane layer and a top anti-seepage fluorescent plate layer which are laid in sequence from bottom to top;

[0008] The water collection and drainage subsystem includes drainage ditches around the site, an underground water collection tank connected to the drainage ditches around the site and located at the edge of the site, the depth of the underground water collection tank is greater than the depth of the drainage ditches around the site, a second flexible hydrophobic water-isolating membrane layer is laid in the drainage ditches around the site and in the underground water collection tank, and the edge of the second flexible hydrophobic water-isolating membrane layer is connected to the edge of the first flexible hydrophobic water-isolating membrane layer;

[0009] A bottom float valve electromagnetic sewage pump is provided at the bottom of the underground water collection tank;

[0010] Contaminated soil is stored above the top anti-seepage fluorescent plate layer, and the upper accumulated water and leachate naturally flow into the drainage ditches around the site, and then flow into the underground water collection tank through the drainage ditches around the site. The bottom float valve electromagnetic sewage pump draws the wastewater in the underground water collection tank to the surface water treatment facility for disposal.

[0011] As a further improvement of the present invention, triangular film placement grooves are evenly spaced and embedded in the bottom support plate layer, and the film placement grooves run through the entire bottom support plate;

[0012] The first flexible hydrophobic waterproof membrane layer is pressed into the membrane groove to form a triangular cavity. When the top anti-seepage fluorescent plate layer is destroyed, the accumulated water and leachate on the top anti-seepage fluorescent plate layer penetrate into the first flexible hydrophobic waterproof membrane layer, and are discharged into the drainage ditches around the site and the underground water collection tank through the triangular cavity.

[0013] As a further improvement of the present invention, an upper float valve electromagnetic rainwater pump is also provided in the upper part of the underground water collection tank to pump rainwater from the upper part of the underground water collection tank during heavy rain periods to the municipal rainwater pipe network.

[0014] As a further improvement of the present invention, there are multiple underground water collection tanks distributed in the four corners of the disposal site.

[0015] As a further improvement of the present invention, there are multiple underground water collection tanks, which are evenly distributed in the corners of the disposal site and on the drainage ditches around the site.

[0016] As a further improvement of the present invention, the top anti-seepage fluorescent plate layer is mixed with fluorescent powder, which fluoresces under dark conditions, making the disposal site identifiable.

[0017] As a further improvement of the present invention, the length, width and depth of the underground water collection tank are 2m, 1.5m and 1m respectively, and the width and depth of the drainage ditch around the disposal site are 0.2m and 0.2m respectively.

[0018] As a further improvement of the present invention, the bottom supporting drag plate layer is made of black PE material plates glued together.

[0019] As a further improvement of the present invention, the top anti-seepage fluorescent plate layer is made of transparent PE material plates bonded together.

[0020] The present invention also provides an application method of an anti-seepage drainage system for a soil remediation and disposal site, comprising:

[0021] Planning a disposal site and leveling and compacting the disposal site;

[0022] Dig drainage ditches and underground water collection tanks around the disposal site;

[0023] Laying a bottom support plate layer on top of the leveled and compacted underground soil layer in the disposal site;

[0024] A flexible hydrophobic water-proof membrane is integrally laid above the bottom support plate layer, in the surrounding drainage ditches and in the underground water collection tank, a first flexible hydrophobic water-proof membrane layer is formed above the bottom support plate layer, and a second flexible hydrophobic water-proof membrane layer is formed in the surrounding drainage ditches and in the underground water collection tank;

[0025] Laying a top anti-seepage fluorescent plate layer on top of the first flexible hydrophobic water-isolating membrane layer;

[0026] A bottom float valve electromagnetic sewage pump is installed at the bottom of the underground water collection tank;

[0027] Storing and disposing of contaminated soil above the top anti-seepage fluorescent plate layer;

[0028] The upper accumulated water and leachate naturally flow into the surrounding drainage ditches, and then flow into the underground water collection tank along the surrounding drainage ditches;

[0029] The electromagnetic sewage pump with a float valve at the bottom of the underground water collection tank works to pump the accumulated water and leachate collected in the underground water collection tank to the surface water treatment facility.

[0030] Compared with the prior art, the present invention has the following beneficial effects:

[0031] The present invention realizes triple anti-seepage by arranging a bottom supporting plate layer, a first flexible hydrophobic water-proofing membrane layer and a top anti-seepage fluorescent plate layer on the disposal site, thereby ensuring the anti-seepage effect of the system. At the same time, by arranging drainage ditches and underground water collection tanks around the site, the accumulated water in the contaminated soil and the leachate generated in the process of remediation of the contaminated soil can automatically flow into the surrounding drainage ditches, thereby realizing automatic collection of the accumulated water and the leachate. By arranging a bottom float valve electromagnetic sewage pump, the accumulated water and the leachate can be automatically pumped to the surface water disposal device for wastewater treatment, thereby avoiding secondary pollution of the wastewater in the contaminated soil.

[0032] The bottom supporting plate layer of the present invention is embedded with a triangular membrane groove, and the flexible hydrophobic water-isolating membrane has a certain amount of stretching after being pressed into the membrane groove, and the anti-seepage system of the disposal site has strong resistance to destructiveness; at the same time, after the top anti-seepage fluorescent plate layer is damaged, the accumulated liquid and leachate in the contaminated soil can still naturally flow into the drainage ditch around the site along the triangular cavity formed by the membrane groove and the flexible hydrophobic water-isolating membrane, thereby avoiding secondary pollution of wastewater in the contaminated soil.

[0033] The bottom float valve electromagnetic sewage pump of the water collection and drainage system of the present invention can realize daily automatic pumping and drainage of wastewater in the water collection pool. During the rainstorm period, the float valve electromagnetic rainwater pump on the upper part of the water collection pool can simultaneously pump and drain rainwater, and the system as a whole realizes rainwater and sewage diversion.

[0034] The second flexible hydrophobic water-isolating membrane layer is arranged inside the underground water collection pool and the drainage ditch of the present invention, and is integrally attached to the surface of the water collection pool and the drainage ditch to play a water-isolating role, thereby avoiding secondary pollution in the process of collecting soil-contaminated wastewater.

[0035] The top anti-seepage fluorescent plate layer of the present invention has strong anti-seepage property, and triple anti-seepage is achieved by adding the first flexible hydrophobic water-isolating film layer and the bottom supporting plate layer, thereby ensuring the anti-seepage effect.

[0036] The top anti-seepage fluorescent plate layer of the present invention has a nighttime fluorescent effect, is easy to identify at night, and has a strong safety concept. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 A schematic diagram of the structure of an anti-seepage drainage system for a soil remediation and disposal site disclosed in an embodiment of the present invention;

[0038] Figure 2 The present invention is a top view of an anti-seepage drainage system structure for a soil remediation and disposal site disclosed in an embodiment of the present invention.

[0039] Description of reference numerals:

[0040] 1. Underground soil layer; 2. Anti-seepage system of disposal site; 21. Top anti-seepage fluorescent plate layer; 22. First flexible hydrophobic waterproof membrane layer; 23. Membrane placement groove; 24. Bottom support plate layer; 3. Water collection and drainage system; 31. Underground water collection tank; 32. Second flexible hydrophobic waterproof membrane layer; 33. Bottom float valve electromagnetic sewage pump; 34. Upper float valve electromagnetic rainwater pump; 35. Ground water treatment facilities; 36. Municipal rainwater pipe network; 37. Drainage ditches around the site. DETAILED DESCRIPTION

[0041] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0042] The present invention is further described in detail below in conjunction with the accompanying drawings:

[0043] like Figure 1 As shown, the present invention provides an anti-seepage drainage system for a soil remediation disposal site, comprising: an anti-seepage subsystem for the disposal site arranged above an underground soil layer 1 in the disposal site, and a water collection and drainage subsystem dug downward around the disposal site, wherein the disposal site needs to be leveled and compacted, with a compaction degree of 93%; the area above the anti-seepage subsystem for the disposal site is used for storing and disposing of contaminated soil;

[0044] The site anti-seepage subsystem includes a bottom support plate layer 24, a first flexible hydrophobic waterproof membrane layer 22 and a top anti-seepage fluorescent plate layer 21, which are laid in sequence from bottom to top. Preferably, the top anti-seepage fluorescent plate layer 21 is 10 cm thick, the first flexible hydrophobic waterproof membrane layer 22 is 2 mm thick, and the bottom support plate layer 24 is 20 cm thick. Furthermore, the top anti-seepage fluorescent plate is formed by bonding a single transparent PE material fluorescent plate with a size of 15×3×0.1m. Fluorescent powder is mixed into the fluorescent plate during the production process, so that the top anti-seepage fluorescent plate layer 21 can show fluorescence at night, and has a high degree of recognition. The bottom support plate layer 24 is formed by bonding a single black PE material plate with a size of 15×3×0.2m.

[0045] like Figure 2 As shown, the water collection and drainage subsystem includes drainage ditches 37 arranged around the disposal site, and an underground water collection tank 31 connected to the drainage ditches 37 and arranged at the edge of the disposal site. The depth of the underground water collection tank 31 is greater than the depth of the drainage ditches 37 around the site. A second flexible hydrophobic water-proof membrane layer 32 is laid in the drainage ditches around the site and in the underground water collection tank 31. The edge of the second flexible hydrophobic water-proof membrane layer 32 is connected to the edge of the first flexible hydrophobic water-proof membrane layer 22. It is preferred that the drainage ditches 37 around the site and the underground water collection tank 31 are formed PE material water collection tanks and formed PE material drainage ditches. The length, width and depth of the underground water collection tank 31 are 2m, 1.5m and 1m respectively. The width and depth of the drainage ditches 37 around the disposal site are 0.2m and 0.2m respectively. The thickness of the second flexible hydrophobic water-proof membrane layer 32 is 2mm.

[0046] A bottom float valve electromagnetic sewage pump 33 is provided at the bottom of the underground water collection tank 31, and preferably the bottom float valve electromagnetic sewage pump 33 has a power of 5.5kw and a lift of 15m;

[0047] Contaminated soil is stored above the top anti-seepage fluorescent plate layer 21, and the upper accumulated water and leachate naturally flow into the drainage ditch 37 around the site, and then flow into the underground water collection tank 31 through the drainage ditch 37 around the site. The bottom float valve electromagnetic sewage pump 33 draws the wastewater in the underground water collection tank 31 to the surface water treatment facility 35 for disposal.

[0048] In the present invention, the bottom support plate layer 24 is evenly spaced with embedded triangular film grooves 23, and the film grooves 23 run through the entire bottom support plate. Preferably, the bottom support plate layer 24 has embedded triangular film grooves 23 every 3m, and the film grooves 23 are 10cm high and run through the entire support plate.

[0049] The first flexible hydrophobic waterproof membrane layer 22 is pressed into the membrane groove 23 to form a triangular cavity. When the top anti-seepage fluorescent plate layer 21 is destroyed, the accumulated water and leachate on the top anti-seepage fluorescent plate layer 21 penetrate into the first flexible hydrophobic waterproof membrane layer 22, and are discharged into the drainage ditch 37 around the site and the underground water collection tank 31 through the triangular cavity.

[0050] In the present invention, an upper float valve electromagnetic rainwater pump 34 is also provided in the upper part of the underground water collection tank 31 to pump rainwater from the upper part of the underground water collection tank 31 during heavy rain to the municipal rainwater pipe network 36 to achieve rainwater and sewage diversion; preferably, the upper float valve electromagnetic rainwater pump 34 has a power of 5.5kw and a lift of 15m.

[0051] In the present invention, Figure 2 As shown, there are multiple underground water collection tanks 31, preferably four, distributed in the four corners of the disposal site; further, the number of underground water collection tanks 31 can be adjusted according to the application area. The application area of ​​four underground water collection tanks 31 set in four corners is 8000m2. When the disposal site is too large, an underground water collection tank 31 is added for every additional 2000m2. Preferably, they can be evenly added on the drainage ditches 37 around the site.

[0052] The present invention also provides an application method of an anti-seepage drainage system for a soil remediation and disposal site, comprising:

[0053] Plan the disposal site and level and compact the disposal site;

[0054] Dig drainage ditches 37 and underground water collection tanks 31 around the disposal site;

[0055] Laying a bottom support plate layer 24 on top of the underground soil layer 1 in the leveled and compacted disposal site;

[0056] A flexible hydrophobic water-proof membrane is integrally laid above the bottom support plate layer 24, in the surrounding drainage ditches and in the underground water collection tank 31, a first flexible hydrophobic water-proof membrane layer 22 is formed above the bottom support plate layer 24, and a second flexible hydrophobic water-proof membrane layer 32 is formed in the surrounding drainage ditches and in the underground water collection tank 31;

[0057] Laying a top anti-seepage fluorescent plate layer 21 on the first flexible hydrophobic water-isolating membrane layer 22;

[0058] A bottom float valve electromagnetic sewage pump 33 and an upper float valve electromagnetic rainwater pump 34 are installed at the bottom and upper part of the underground water collection tank 31, respectively. A surface water treatment facility and a municipal rainwater pipe network 36 are arranged at the outer edge of the underground water collection tank 31. The outlet of the bottom float valve electromagnetic sewage pump 33 is connected to the surface water treatment facility, and the outlet of the upper float valve electromagnetic rainwater pump 34 is connected to the municipal rainwater pipe network 36.

[0059] Storing and disposing of contaminated soil above the top anti-seepage fluorescent plate layer 21;

[0060] The upper accumulated water and leachate naturally flow into the surrounding drainage ditches, and then flow into the underground water collection tank 31 along the surrounding drainage ditches;

[0061] The electromagnetic sewage pump 33 with a floating ball valve at the bottom of the underground water collection tank 31 works to pump the accumulated water and leachate collected in the underground water collection tank 31 to the surface water treatment facility 35;

[0062] During the rainstorm period, the electromagnetic rainwater pump 34 with the upper float valve in the underground water collection tank 31 works to pump the rainwater collected in the upper part of the underground water collection tank 31 to the municipal rainwater pipe network 36.

[0063] In the present invention, the anti-seepage subsystem of the disposal site is suitable for the case where the soil pile height does not exceed 8m.

[0064] Embodiment 1:

[0065] The invention discloses an anti-seepage drainage system for a soil remediation and disposal site, which is applied to a pollution disposal site. The soil pollutants are heavy metal arsenic, organic pollutants benzo(a)pyrene and pentachlorophenol, and the total soil pollution volume is 8500m3. An ex situ disposal method is adopted to remediate the soil, and the remediation technology is ex situ solidification stabilization and ex situ chemical oxidation technology.

[0066] Step 1: Plan the disposal site, level and compact the disposal site, and ensure that the compaction degree is 93%;

[0067] Step 2: dig a ditch for drainage ditches 37 around the disposal site, dig a pit for underground water collection tank 31 at two corners on any diagonal line of the disposal site, lay a PE drainage ditch 37 around the site in the ditch with a size of 20×20 cm, and place an underground water collection tank 31 with a fixed size of 1.5×2×1 m and made of PE material in the pit;

[0068] Step 3: Lay a bottom support plate layer 24 on top of the underground soil layer 1 in the leveled and compacted disposal site. The bottom support plate layer 24 is specifically made of a single black PE material plate with a size of 15×3×0.2m bonded together. A film placement groove 23 with a height of 10cm and running through the entire support plate layer is provided every 3m in the bottom support plate layer 24. Figure 1 As shown;

[0069] Step 4: A flexible hydrophobic water-proof membrane is integrally laid on the bottom support plate layer 24, in the surrounding drainage ditches and in the underground water collection tank 31, a first flexible hydrophobic water-proof membrane layer 22 is formed on the bottom support plate layer 24, a second flexible hydrophobic water-proof membrane layer 32 is formed in the surrounding drainage ditches and in the underground water collection tank 31, the first flexible hydrophobic water-proof membrane layer 22 and the second flexible hydrophobic water-proof membrane layer 32 are both ductile and have a thickness of 2 mm, and the first flexible hydrophobic water-proof membrane layer 22 is pressed into the membrane groove 23 to form a triangular cavity;

[0070] Step 5: Lay a top anti-seepage fluorescent plate layer 21 on the first flexible hydrophobic water-isolating film layer 22. The anti-seepage fluorescent plate layer is specifically formed by gluing together a single transparent PE material fluorescent plate with a size of 15×3×0.1m;

[0071] Step 6: Install a bottom float valve electromagnetic sewage pump 33 and an upper float valve electromagnetic rainwater pump 34 at the bottom and upper parts of the underground water collection tank 31, respectively, set up surface water treatment facilities and a municipal rainwater pipe network 36 at the outer edge of the underground water collection tank 31, connect the outlet of the bottom float valve electromagnetic sewage pump 33 to the surface water treatment facilities, and connect the outlet of the upper float valve electromagnetic rainwater pump 34 to the municipal rainwater pipe network 36;

[0072] Step 7: The contaminated soil is stored above the top anti-seepage fluorescent plate layer 21 and treated by ex situ solidification stabilization and ex situ chemical oxidation technology;

[0073] Step 8: The accumulated water and leachate on the top anti-seepage fluorescent plate layer 21 naturally flow into the surrounding drainage ditches, and then flow into the underground water collection tank 31 along the surrounding drainage ditches; when the top anti-seepage fluorescent plate layer 21 is damaged, the first flexible hydrophobic water-isolating membrane layer 22 discharges the accumulated water and leachate into the surrounding drainage ditches through the triangular cavity of the membrane groove 23, and then flows into the underground water collection tank 31 along the surrounding drainage ditches;

[0074] Step 9: The electromagnetic sewage pump 33 with a floating ball valve at the bottom of the underground water collection tank 31 works in real time to pump the accumulated water and leachate collected in the underground water collection tank 31 to the surface water treatment facility 35;

[0075] Step 10: During the rainstorm period, the electromagnetic rainwater pump 34 with the upper float valve in the underground water collection tank 31 works to pump the rainwater collected in the upper part of the underground water collection tank 31 to the municipal rainwater pipe network 36.

[0076] According to actual disposal needs, the total area of ​​the anti-seepage system of the present invention is 3000m2, and two collection pools are built. Solidification stabilization and chemical oxidation technology are implemented on the anti-seepage system of the present invention. The repair equipment used is excavator and ALLU. During the period, a total of 500m3 of leachate wastewater is collected and treated. During the implementation period, the anti-seepage drainage system of the present invention operates well. After removal from the site for inspection, no secondary pollution is generated in the disposal area. The recycling rate of the anti-seepage system of the present invention in this project is higher than 90%.

[0077] Advantages of the present invention:

[0078] The present invention realizes triple anti-seepage by arranging a bottom supporting plate layer, a first flexible hydrophobic water-proofing membrane layer and a top anti-seepage fluorescent plate layer on the disposal site, thereby ensuring the anti-seepage effect of the system. At the same time, by arranging drainage ditches and underground water collection tanks around the site, the accumulated water in the contaminated soil and the leachate generated in the process of remediation of the contaminated soil can automatically flow into the surrounding drainage ditches, thereby realizing automatic collection of the accumulated water and the leachate. By arranging a bottom float valve electromagnetic sewage pump, the accumulated water and the leachate can be automatically pumped to the surface water disposal device for wastewater treatment, thereby avoiding secondary pollution of the wastewater in the contaminated soil.

[0079] The bottom supporting plate layer of the present invention is embedded with a triangular membrane groove, and the flexible hydrophobic water-isolating membrane has a certain amount of stretching after being pressed into the membrane groove, and the anti-seepage system of the disposal site has strong resistance to destructiveness; at the same time, after the top anti-seepage fluorescent plate layer is damaged, the accumulated liquid and leachate in the contaminated soil can still naturally flow into the drainage ditch around the site along the triangular cavity formed by the membrane groove and the flexible hydrophobic water-isolating membrane, thereby avoiding secondary pollution of wastewater in the contaminated soil.

[0080] The bottom float valve electromagnetic sewage pump of the water collection and drainage system of the present invention can realize daily automatic pumping and drainage of wastewater in the water collection pool. During the rainstorm period, the float valve electromagnetic rainwater pump on the upper part of the water collection pool can simultaneously pump and drain rainwater, and the system as a whole realizes rainwater and sewage diversion.

[0081] The second flexible hydrophobic water-isolating membrane layer is arranged inside the underground water collection pool and the drainage ditch of the present invention, and is integrally attached to the surface of the water collection pool and the drainage ditch to play a water-isolating role, thereby avoiding secondary pollution in the process of collecting soil-contaminated wastewater.

[0082] The top anti-seepage fluorescent plate layer of the present invention has strong anti-seepage property, and triple anti-seepage is achieved by adding the first flexible hydrophobic water-isolating film layer and the bottom supporting plate layer, thereby ensuring the anti-seepage effect.

[0083] The top anti-seepage fluorescent plate layer of the present invention has a nighttime fluorescent effect, is easy to identify at night, and has a strong safety concept.

[0084] The present invention is made of PE material as a whole, which is easy to disassemble and assemble, easy to clean, and recyclable, thus avoiding the generation of concrete slag solid waste and meeting the concept of "carbon neutrality";

[0085] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An anti-seepage drainage system for soil remediation and disposal sites, characterized in that: include: The anti-seepage subsystem of the disposal site is set above the underground soil layer in the disposal site, and the water collection and drainage subsystem is dug down around the disposal site; The site anti-seepage subsystem comprises a bottom support plate layer, a first flexible hydrophobic water-isolating membrane layer and a top anti-seepage fluorescent plate layer which are laid in sequence from bottom to top; The water collection and drainage subsystem includes drainage ditches around the site, an underground water collection tank connected to the drainage ditches around the site and located at the edge of the site, the depth of the underground water collection tank is greater than the depth of the drainage ditches around the site, a second flexible hydrophobic water-isolating membrane layer is laid in the drainage ditches around the site and in the underground water collection tank, and the edge of the second flexible hydrophobic water-isolating membrane layer is connected to the edge of the first flexible hydrophobic water-isolating membrane layer; A bottom float valve electromagnetic sewage pump is provided at the bottom of the underground water collection tank; Contaminated soil is stored above the top anti-seepage fluorescent plate layer, and the upper accumulated water and leachate naturally flow into the drainage ditches around the site, and then flow into the underground water collection tank through the drainage ditches around the site. The bottom float valve electromagnetic sewage pump draws the wastewater in the underground water collection tank to the surface water treatment facility for disposal.

2. The anti-seepage drainage system for soil remediation and disposal sites according to claim 1, characterized in that: The bottom support plate layer has evenly spaced embedded triangular film placement grooves, and the film placement grooves run through the entire bottom support plate; The first flexible hydrophobic waterproof membrane layer is pressed into the membrane groove to form a triangular cavity. When the top anti-seepage fluorescent plate layer is destroyed, the accumulated water and leachate on the top anti-seepage fluorescent plate layer penetrate into the first flexible hydrophobic waterproof membrane layer, and are discharged into the drainage ditches around the site and the underground water collection tank through the triangular cavity.

3. The anti-seepage drainage system for soil remediation and disposal sites according to claim 1, characterized in that: An upper float valve electromagnetic rainwater pump is also provided in the upper part of the underground water collection tank to pump rainwater from the upper part of the underground water collection tank during heavy rain to the municipal rainwater pipe network.

4. The anti-seepage drainage system for soil remediation and disposal sites according to claim 1, characterized in that: There are multiple underground water collection tanks distributed in the four corners of the disposal site.

5. The anti-seepage drainage system for soil remediation and disposal sites according to claim 1, characterized in that: There are multiple underground water collection tanks, which are evenly distributed in the corners of the disposal site and on the drainage ditches around the site.

6. The anti-seepage drainage system for soil remediation and disposal sites according to claim 1, characterized in that: The top anti-seepage fluorescent plate layer is mixed with fluorescent powder, which fluoresces under dark conditions, making the disposal site identifiable.

7. The anti-seepage drainage system for soil remediation and disposal sites according to claim 1, characterized in that: The length, width and depth of the underground water collection tank are 2m, 1.5m and 1m respectively, and the width and depth of the drainage ditch around the disposal site are 0.2m and 0.2m respectively.

8. The anti-seepage drainage system for soil remediation and disposal sites according to claim 1, characterized in that: The bottom supporting drag plate layer is made of black PE material plates bonded together.

9. The anti-seepage drainage system for soil remediation and disposal sites according to claim 1, characterized in that: The top anti-seepage fluorescent plate layer is made of transparent PE material plates bonded together.

10. An application method of an anti-seepage drainage system for a soil remediation and disposal site, using the anti-seepage drainage system for a soil remediation and disposal site as claimed in any one of claims 1 to 9, characterized in that: Planning a disposal site and leveling and compacting the disposal site; Dig drainage ditches and underground water collection tanks around the disposal site; Laying a bottom support plate layer on top of the leveled and compacted underground soil layer in the disposal site; A flexible hydrophobic water-proof membrane is integrally laid above the bottom support plate layer, in the surrounding drainage ditches and in the underground water collection tank, a first flexible hydrophobic water-proof membrane layer is formed above the bottom support plate layer, and a second flexible hydrophobic water-proof membrane layer is formed in the surrounding drainage ditches and in the underground water collection tank; Laying a top anti-seepage fluorescent plate layer on top of the first flexible hydrophobic water-isolating membrane layer; A bottom float valve electromagnetic sewage pump is installed at the bottom of the underground water collection tank; Storing and disposing of contaminated soil above the top anti-seepage fluorescent plate layer; The upper accumulated water and leachate naturally flow into the surrounding drainage ditches, and then flow into the underground water collection tank along the surrounding drainage ditches; The electromagnetic sewage pump with a float valve at the bottom of the underground water collection tank works to pump the accumulated water and leachate collected in the underground water collection tank to the surface water treatment facility.

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