A rigid landfill

Abstract

This invention discloses a rigid landfill comprising a reinforced concrete wall A and a reinforced concrete base slab. The reinforced concrete wall A is vertically fixed to the upper surface of the reinforced concrete base slab, dividing the rigid landfill into several zones. Gaps are left between the reinforced concrete walls A of adjacent zones. Each zone is further divided into several units by a reinforced concrete wall B, and each unit is lined with a flexible artificial liner. This invention divides the landfill into several zones, each zone into several cells, enabling classified landfilling of waste. Furthermore, the gaps between the zones allow each zone to become an independent unit, and multiple units form a large-scale landfill, avoiding leachate leakage caused by base slab fracture or flexible artificial liner damage due to unstable geological structures.

Description

Technical Field

[0001] This invention belongs to the field of landfill technology, and specifically relates to a rigid landfill. Background Technology

[0002] With the increasingly severe environmental protection situation, industrial solid waste is being treated in a way that involves reduction, resource recovery, and harmless disposal. However, each treatment method generates a large amount of ash residue, which contains a large amount of untreated heavy metals and some toxic and harmful substances. Therefore, such ash residue is still classified as hazardous waste and is eventually disposed of safely in landfills after stabilization.

[0003] Existing rigid landfills, with their integrated bottom slab and side walls, are prone to leachate leakage if the geological structure is unstable and the bottom slab cracks after waste is landfilled. This leakage can easily pollute the soil and groundwater, causing serious environmental pollution. Repairing the bottom slab requires cleaning up all the waste in the landfill area, which is a large-scale project. Furthermore, the lack of leachate collection devices allows leachate from the waste to accumulate at the bottom of the landfill, reducing the service life of the flexible artificial liner. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a relatively independent rigid landfill that can collect leachate and prevent large-scale leakage of leachate.

[0005] To solve the above problems, the present invention provides a rigid landfill, comprising a reinforced concrete wall A and a reinforced concrete base slab. The reinforced concrete wall A is vertically fixed to the upper surface of the reinforced concrete base slab and divides the rigid landfill into several storage areas. Gaps are left between the reinforced concrete walls A of adjacent storage areas. Each storage area is divided into several units by a reinforced concrete wall B, and a flexible artificial liner is laid in each unit.

[0006] Furthermore, the flexible artificial lining is laid on the inner surfaces of the reinforced concrete wall A and the reinforced concrete wall B, as well as the bottom surface of the unit.

[0007] Furthermore, the flexible artificial liner comprises, from the inside out, a composite geonet, a geomembrane, nonwoven fabric A, and nonwoven fabric B.

[0008] Furthermore, a concrete layer is laid on the bottom surface of the unit beneath the composite geonet.

[0009] Furthermore, a pebble layer is also laid inside the flexible artificial lining at the bottom of the unit, and the pebble layer is laid between the nonwoven fabric A and the nonwoven fabric B.

[0010] Furthermore, a leachate collection pipe is provided at the lowest point of the pebble layer. The surface of the leachate collection pipe has several holes. The leachate collection pipe is connected to the leachate collection main pipe through leachate collection branch pipes. The leachate collection main pipe is laid in the gap.

[0011] Furthermore, the upper surface of the concrete layer is funnel-shaped, and a grid drainage channel is provided at the lowest end of the upper surface. The grid drainage channel is connected to the main drainage pipe through drainage branch pipes, and the main drainage pipe is laid in the gap.

[0012] Compared with the prior art, the present invention has the following advantages:

[0013] (1) The rigid landfill of the present invention is divided into several storage areas, and each storage area is further divided into several units. After the waste is classified, the waste can be classified and landfilled. Furthermore, there are gaps between the storage areas, so that each storage area becomes an independent area. A large-scale landfill is composed of multiple storage areas, which avoids the leakage of leachate from the entire landfill due to the fracture of the bottom plate or the damage of the flexible artificial liner caused by the unstable geological structure.

[0014] (2) By setting the bottom of the landfill area in a funnel shape, the leachate and groundwater in the waste will be collected separately. The leachate is then collected through the leachate collection branch pipe and then transported to the leachate collection pool for centralized treatment. The groundwater is collected through the drainage branch pipe and then transported to the drainage pool for centralized treatment. The leachate and groundwater are collected and concentrated through the leachate collection pipe and the groundwater collection pipe respectively, so as to avoid the leachate and groundwater from corroding the flexible artificial liner by soaking.

[0015] (3) The present invention lays a flexible artificial liner on the surface of the reinforced concrete wall at the bottom and around the landfill unit. The flexible artificial liner includes, from the inside out, a composite geonet, a geomembrane, non-woven fabric A, and non-woven fabric B. Non-woven fabric A, non-woven fabric B, and composite geonet will effectively protect the geomembrane set in the middle, avoiding damage to the geomembrane during construction. At the same time, non-woven fabric A and non-woven fabric B on the geomembrane can also play a certain role in preventing seepage, reducing the risk of leachate seepage and leakage. Attached Figure Description

[0016] Figure 1 This is a front sectional view of the present invention.

[0017] Figure 2 for Figure 1 Top view.

[0018] Figure 3 for Figure 1 Enlarged view of point A in the middle.

[0019] In the diagram: 1. Reinforced concrete wall A, 2. Reinforced concrete base slab, 3. Concrete layer, 4. Composite geonet, 5. Impermeable membrane, 6. Non-woven fabric A, 7. Gravel layer, 8. Non-woven fabric B, 9. Grid drainage channel, 10. Drainage branch pipe, 11. Drainage main pipe, 12. Gap, 13. Leachate collection main pipe, 14. Leachate collection pipe, 15. Leachate collection branch pipe, 16. Reservoir area, 17. Unit, 18. Reinforced concrete wall B. Detailed Implementation

[0020] like Figure 1 , 2 As shown in Figure 3, a rigid landfill is constructed by excavating to the designed depth according to the geological structure of the site and the designed landfill depth before construction. Then, the foundation layer is compacted and leveled. The reinforced concrete base slab 2 and reinforced concrete wall A1 are constructed first. The reinforced concrete wall A1 is vertically fixed to the upper surface of the reinforced concrete base slab 2 and divides the rigid landfill into several storage areas 16. A gap 12 is left between the reinforced concrete walls A1 of adjacent storage areas 16. The storage area 16 is divided into several units 17 by the reinforced concrete wall B18. A flexible artificial liner is laid in the unit 17. The flexible artificial liner is laid on the inner surface of the reinforced concrete wall A1, the reinforced concrete wall B18 and the bottom surface of the unit 17. The flexible artificial liner includes, from the inside out, a composite geonet (4), a geomembrane (5), a non-woven fabric A (6), and a non-woven fabric B18. Nonwoven fabric B (8); The bottom surface of unit (17) is laid with a concrete layer (3) under the composite geonet (4). The upper surface of the concrete layer (3) is funnel-shaped. The lowest end of the upper surface is provided with a grid drainage channel (9). The grid drainage channel (9) is connected to the main drainage pipe (11) through the drainage branch pipe (10). The main drainage pipe (11) is laid in the gap (12). The bottom surface of unit (17) is also laid with a pebble layer (7). The pebble layer (7) is laid between nonwoven fabric A (6) and nonwoven fabric B (8). The lowest point of the pebble layer (7) is provided with a leachate collection pipe (14). The surface of the leachate collection pipe (14) is provided with several holes. The leachate collection pipe (14) is connected to the leachate collection main pipe (13) through the leachate collection branch pipe (15). The leachate collection main pipe (13) is laid in the gap (12).

[0021] The working process of this invention is as follows:

[0022] After the landfill is constructed, solid waste to be landfilled is transported to the landfill by vehicles. Then, the solid waste is filled into each unit 17 in the storage area 16 by transfer equipment such as loaders, conveyor belts, and trolleys. After filling, the landfill is sealed. Over time, the leachate carried by the waste itself and the liquid produced by microbial or chemical reactions after sealing will gradually settle downwards under the action of gravity. After seeping through the non-woven fabric B8, it enters the pebble layer 7. An impermeable membrane 5 is laid under the non-woven fabric A6 at the bottom of the pebble layer 7 to prevent further seepage of the leachate. Since the concrete layer 3 is set in a funnel shape, the leachate collects at the lowest point in the pebble layer 7 under the action of gravity. The leachate collection pipe 14 is set at the lowest point of the pebble layer 7 and finally collects in the leachate collection pipe 14. The leachate is collected into the leachate collection main pipe 13 through the leachate collection branch pipe 15 and transported to the leachate collection pool for centralized treatment.

[0023] If the groundwater level rises, causing groundwater to seep upwards, after the groundwater seeps through the reinforced concrete base slab 2 and the concrete layer 3, the impermeable membrane 5 prevents the groundwater from seeping further upwards. Under the action of gravity, the groundwater flows along the slope into the grid drainage channel 9 on the surface of the concrete layer 3, enters the drainage main pipe 11 through the drainage branch pipe 10, and is collected in the groundwater collection pool through the drainage main pipe 11.

[0024] Since the present invention is divided into several storage areas 16, with gaps 12 between adjacent storage areas 16, and the storage area 16 is divided into several units 17 by reinforced concrete walls B18, when the underground landfill is damaged or the flexible artificial liner fails after a geological disaster such as an earthquake, and the landfill needs to be repaired, it is only necessary to excavate the solid waste in the damaged storage area 16 or unit 17, and then carry out the repair work, thus avoiding the leakage of leachate from the entire landfill.

Claims

1. A rigid landfill, comprising a reinforced concrete wall A (1) and a reinforced concrete base slab (2), characterized in that: The reinforced concrete wall A (1) is vertically fixed to the upper surface of the reinforced concrete base slab (2) and divides the rigid landfill into several storage areas (16). A gap (12) is left between the reinforced concrete walls A (1) of adjacent storage areas (16). The storage area (16) is divided into several units (17) by the reinforced concrete wall B (18). A flexible artificial liner is laid in the unit (17). The flexible artificial liner is laid on the inner surface of the reinforced concrete wall A (1), the reinforced concrete wall B (18) and the bottom surface of the unit (17). The flexible artificial liner includes, from the inside out, a composite geonet (4), a geomembrane (5), a non-woven fabric A (6) and a non-woven fabric B (8). A pebble layer (7) is also laid in the flexible artificial liner on the bottom surface of the unit (17). The pebble layer (7) is laid between the nonwoven fabric A (6) and the nonwoven fabric B (8). A leachate collection pipe (14) is provided at the lowest point of the pebble layer (7). The surface of the leachate collection pipe (14) is provided with several holes. The leachate collection pipe (14) is connected to the leachate collection main pipe (13) through the leachate collection branch pipe (15). The leachate collection main pipe (13) is laid in the gap (12). The bottom surface of the unit (17) is laid with a concrete layer (3) below the composite geonet (4). The upper surface of the concrete layer (3) is funnel-shaped. A grid drainage trough (9) is provided at the lowest end of the upper surface. The grid drainage trough (9) is connected to the drainage main pipe (11) through the drainage branch pipe (10). The drainage main pipe (11) is laid in the gap (12).

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