Efficient dehydration pretreatment system for high-water-content and high-viscosity garbage soil

Abstract

The utility model relates to an efficient dehydration pretreatment system for high-water-content and high-viscosity garbage soil, which comprises a sand cushion layer, a plastic drainage plate, a sealing ditch, a water filtering layer, a submersible sewage pump and a regulating reservoir, and the sand cushion layer covers the garbage soil body; the water filtering layer is arranged above the sand cushion layer; the sealing ditch surrounds the garbage soil body; the upper end of the plastic drainage plate penetrates through the sand cushion layer and is connected with the water filtering layer; the submersible sewage pumps are arranged on two sides of the garbage soil body, water inlet ends are connected into the sealing ditch, and water outlet ends are connected with the adjusting tank; and the controller controls the submersible sewage pump to extract sewage in the sealing ditch. The device is reasonable in overall design, the water content and viscosity of the garbage soil body are effectively reduced, the construction period is shortened, labor input is reduced, and environmental pollution is relieved. And meanwhile, the garbage soil subjected to vacuum dehydration pretreatment can normally enter screening equipment to be screened, the process requirement for the screening equipment is low, and the capital investment of the screening equipment is reduced.

Description

Technical Field

[0001] This utility model relates to the field of landfill soil treatment, specifically to a high-efficiency dewatering pretreatment system for landfill soil with high moisture content and high viscosity. Background Technology

[0002] With the advancement of my country's socio-economic development and urbanization, the construction of waste sorting and treatment facilities has entered a critical period. The volume of domestic waste, construction waste, and industrial waste is increasing rapidly, making existing landfill facilities a significant risk point for ecological and environmental governance. For example, the capacity of formal landfills in the Yangtze River Delta and Pearl River Delta regions is insufficient to handle all the waste generated in these areas. Consequently, disorderly, chaotic, and unsorted waste is dumped indiscriminately, forming informal landfills. Leachate produced by waste fermentation spreads into groundwater, polluting the groundwater environment and causing harm to the ecological environment and human health.

[0003] In landfills, waste decomposes under aerobic and anaerobic conditions, producing large amounts of malodorous gases that volatilize during excavation, transportation, and dumping, causing environmental pollution. In informal landfills, no seepage prevention measures are implemented between waste and soil during dumping; the top of the waste pile lacks a seepage-proof membrane and drainage ditches, resulting in high moisture content at the bottom of the waste soil. This moisture content and viscosity affect the low and unstable screening efficiency. Furthermore, the waste often contains a high proportion of soil, leading to incomplete screening and hindering volume reduction, harmless treatment, and resource recovery. Both the high moisture content and high viscosity of the waste soil contribute to its stickiness, making screening difficult. Reducing the moisture content of the waste soil effectively reduces its stickiness, significantly improving screening efficiency.

[0004] The consistency and plasticity of clayey soil are physical properties exhibited by soil particles after interaction with water. Currently, for the problem of high moisture content and high viscosity of waste soil in informal landfills, existing processes either involve feeding the excavated waste soil into screening equipment or spreading and drying the waste. The former method, with its high moisture content and viscosity, easily clogs the screening equipment and fails to achieve effective separation, resulting in reduced screening efficiency, rework, and extended construction periods. The latter method requires the landfill construction area to provide space for spreading and drying the waste, and is greatly affected by weather conditions. Furthermore, the effect of drying to reduce moisture content and viscosity often fails to meet the screening requirements of the equipment. Therefore, existing waste soil pretreatment processes need further improvement, especially for the pretreatment of waste soil with high moisture content and high viscosity in informal landfills. Utility Model Content

[0005] In order to overcome the problems of high moisture content and viscosity of waste soil in informal landfills and low efficiency of on-site screening equipment, the technical problem to be solved by this utility model is to provide a high-efficiency dewatering pretreatment system for waste soil with high moisture content and high viscosity. After pretreatment, the waste soil can be directly fed into the screening equipment to ensure screening efficiency.

[0006] To address the aforementioned technical problems, this utility model discloses a highly efficient dewatering pretreatment system for high-moisture-content, high-cohesion waste soil, comprising a sand cushion layer, plastic drainage boards, a sealing trench, a filter layer, a submersible pump, and a regulating tank.

[0007] The sand cushion layer covers the waste soil mass;

[0008] The filter layer is positioned above the sand cushion layer;

[0009] The sealing trench surrounds the garbage soil body;

[0010] The plastic drainage board is installed inside the garbage soil, and its upper end passes through the sand cushion layer and connects to the water filter layer.

[0011] The submersible pump is installed on both sides of the garbage soil, with the inlet end connected to the sealed ditch and the outlet end connected to the regulating tank.

[0012] It also includes a controller, the input end of which is connected to a level gauge installed inside the side wall of the sealing trench, and the output end of which is connected to the submersible pump to control the submersible pump to extract sewage from the sealing trench.

[0013] Furthermore, the filter layer includes a vacuum suction pipe, which is connected to a vacuum pump located outside the sealing trench, and the outlet of the vacuum pump is connected to the sealing trench.

[0014] Furthermore, it also includes geotextile and plastic sealing film, the geotextile covering the drainage layer and the sealing trench soil layer; the plastic sealing film covering the geotextile.

[0015] Furthermore, the plastic drainage boards are arranged in a matrix, passing through the sand cushion layer and the garbage soil in sequence, and vertically inserted into the garbage soil. The part of the plastic drainage board extending out of the sand cushion layer is connected to the vacuum suction pipe in the filter layer through a three-way assembly.

[0016] Furthermore, the sealing trench has a depth of 100-150cm and a width of 50-70cm, with the specific values ​​determined by the required volume of vacuum-dehydrated waste soil.

[0017] Furthermore, the thickness of the sand cushion layer is 25-35cm.

[0018] Furthermore, the three vacuum suction pipes are connected to one vacuum pump, with the vacuum pumps spaced 270-300cm apart.

[0019] Furthermore, the geotextile and plastic sealing film are laid 100-200cm beyond the perimeter of the sealing trench.

[0020] Furthermore, the plastic drainage boards are spaced equidistantly from left to right and front to back with a spacing of 90-110cm; the plastic drainage boards are inserted into the garbage soil to a depth exceeding the garbage soil and exceeding the normal soil layer below the garbage soil by 50cm.

[0021] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0022] First, the sand cushion layer has good permeability, which can improve the drainage speed of the waste soil and prevent uneven settlement of the soil.

[0023] Secondly, since the water extracted from the waste soil is polluting, setting up a sealed ditch can effectively prevent water from overflowing from the waste soil. Submersible pumps are installed on both sides of the waste soil, and level gauges are installed inside the side walls of the sealed ditch. The wastewater in the loading area is extracted through an intelligent water extraction system to ensure that the wastewater load exerts pressure on the waste soil during vacuum dehydration, thereby improving dehydration efficiency and preventing wastewater from overflowing from the sealed ditch and polluting the nearby site.

[0024] Third, the plastic drainage boards are arranged in a matrix and vertically installed in the waste soil, passing through the waste soil and sand cushion layer from top to bottom. The plastic drainage boards are inserted into the waste soil to a depth exceeding the normal soil layer below the waste, ensuring that the dewatering effect of the entire waste soil is maximized.

[0025] Fourth, after the plastic drainage board is connected to the vacuum suction pipe, a layer of geotextile is laid on top of the filter layer. This helps the pressure of the sewage pumped out during the dewatering process on the garbage soil to be evenly applied to the surface of the filter layer, and prevents the filter layer pipe fittings from puncturing the sealing material, thus affecting the vacuum dewatering effect.

[0026] Fifth, geotextile and plastic sealing film are laid along the bottom of the sealing trench, extending beyond the perimeter of the trench. This helps to mitigate the settling caused by the extraction of air and sewage during vacuum dehydration, while also forming a barrier between the sewage pile and the waste soil to prevent sewage from re-entering the soil.

[0027] Sixth, the filter layer includes vacuum suction pipes, which are connected to a vacuum pump installed on the outside of the sealing trench. Three vacuum suction pipes are connected to one vacuum pump to improve vacuum dehydration efficiency and shorten the processing cycle.

[0028] Seventh, the invention has a reasonable overall design, effectively reducing the moisture content and stickiness of the waste soil, shortening the construction period, reducing labor input, and mitigating environmental pollution. Furthermore, after vacuum dewatering pretreatment, the waste soil can be normally fed into screening equipment for screening, with lower process requirements for the screening equipment, thus reducing capital investment in screening equipment. Attached Figure Description

[0029] Figure 1 This is a plan view of the present invention.

[0030] Figure 2 This is a vertical cross-sectional schematic diagram of the present invention.

[0031] The components include: 1. Sand cushion layer; 2. Plastic drainage board; 3. Garbage soil; 4. Vacuum suction pipe; 5. Geotextile; 6. Plastic sealing film; 7. Sealing trench; 8. Vacuum pump; 9. Submersible sewage pump; and 10. Equalization tank. Detailed Implementation

[0032] like Figure 1 and Figure 2 As shown, a high-efficiency dewatering pretreatment system for high-moisture-content, high-viscosity waste soil includes a sand cushion layer 1, a plastic drainage board 2, a sealing ditch 7, a filter layer, a submersible pump 9, and an equalization tank 10.

[0033] The sand cushion layer 1 covers the garbage soil 3. The sand cushion layer 1 consists of a layer of coarse sand and has a thickness of 30cm.

[0034] The filter layer is positioned above the sand cushion layer 1.

[0035] The sealing trench 7 surrounds the garbage soil 3, with a depth of 130cm and a width of 60cm.

[0036] The plastic drainage board 2 is installed inside the garbage soil 3, and its upper end passes through the sand cushion layer 1 to connect to the water filter layer.

[0037] The submersible pump 9 is installed on both sides of the garbage soil 3, with the inlet end connected to the sealing ditch 7 and the outlet end connected to the regulating tank 10.

[0038] It also includes a controller, the input end of which is connected to a level gauge installed inside the side wall of the sealing trench 7, and the output end of which is connected to the submersible pump 9, controlling the submersible pump 9 to extract sewage from the sealing trench 7.

[0039] A level gauge is installed inside the side wall of the sealing trench 7, and the submersible pump 9 extracts sewage from the sealing trench 7 through an intelligent water extraction system.

[0040] The filter layer includes vacuum suction pipes 4, which are connected to a vacuum pump 8 located outside the sealing trench 7. The outlet of the vacuum pump 8 is connected to the sealing trench 7. Three vacuum suction pipes 8 are connected to one vacuum pump, with the vacuum pumps spaced 280 cm apart.

[0041] It also includes geotextile 5 and HDPE sealing film 6. The geotextile 5 covers the filter layer and the soil layer of the sealing trench 7. The HDPE sealing film 6 covers the geotextile 5. The geotextile 5 and HDPE sealing film 6 are laid along the bottom of the sealing trench 7 and the laying range extends 150cm beyond the perimeter of the sealing trench 7.

[0042] The plastic drainage boards 2 are arranged in a matrix with equal spacing of 100cm in all directions. They pass through the sand cushion layer 1 and the garbage soil 3 in sequence, and are vertically inserted into the garbage soil 3. The plastic drainage boards 2 are inserted into the garbage soil 3 to a depth exceeding the normal soil layer below the garbage soil 3 by 50cm. The part of the plastic drainage boards 2 that extends out of the sand cushion layer 1 is connected to the vacuum suction pipe 4 in the filter layer through a three-way assembly.

[0043] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the scope of the present utility model. Various modifications and improvements made by those skilled in the art to the technical solution of the present utility model without departing from the design principle of the present utility model should be included within the protection scope defined by the claims of the present utility model.

Claims

1. A highly efficient dewatering pretreatment system for high-moisture-content, high-cohesion waste soil, characterized in that: It includes a sand cushion layer (1), a plastic drainage board (2), a sealing trench (7), a filter layer, a submersible pump (9), and a regulating tank (10). The sand cushion layer (1) covers the garbage soil body (3); The filter layer is positioned above the sand cushion layer (1); The sealing trench (7) surrounds the garbage soil body (3) on all four sides; The plastic drainage board (2) is installed inside the garbage soil (3), and its upper end passes through the sand cushion layer (1) to connect to the water filter layer; The submersible pump (9) is installed on both sides of the garbage soil (3), with the inlet end connected to the sealing ditch (7) and the outlet end connected to the regulating tank (10); It also includes a controller, the input end of which is connected to a level gauge installed inside the side wall of the sealing trench (7), and the output end of which is connected to the submersible pump (9) to control the submersible pump (9) to extract sewage from the sealing trench (7).

2. The high-efficiency dewatering pretreatment system for high-moisture-content, high-cohesion waste soil according to claim 1, characterized in that, The filter layer includes a vacuum suction pipe (4), which is connected to a vacuum pump (8) located outside the sealing groove (7). The outlet of the vacuum pump (8) is connected to the sealing groove (7).

3. The high-efficiency dewatering pretreatment system for high-moisture-content, high-cohesion waste soil according to claim 1, characterized in that, It also includes geotextile (5) and plastic sealing film (6), the geotextile (5) covering the soil layer of the filter layer and the sealing trench (7); the plastic sealing film (6) covering the geotextile (5).

4. The high-efficiency dewatering pretreatment system for high-moisture-content, high-cohesion waste soil according to claim 1, characterized in that, The plastic drainage boards (2) are arranged in a matrix and pass through the sand cushion layer (1) and the garbage soil (3) in sequence. They are vertically inserted into the garbage soil (3). The part of the plastic drainage board (2) that extends out of the sand cushion layer (1) is connected to the vacuum suction pipe (4) in the filter layer through a three-way assembly.

5. The high-efficiency dewatering pretreatment system for high-moisture-content, high-cohesion waste soil according to claim 1, characterized in that, The sealing trench (7) has a depth of 100-150cm and a width of 50-70cm. The specific values ​​are determined by the volume of the required vacuum dewatered waste soil (3).

6. The high-efficiency dewatering pretreatment system for high-moisture-content, high-cohesion waste soil according to claim 1, characterized in that, The thickness of the sand cushion layer (1) is 25-35cm.

7. The high-efficiency dewatering pretreatment system for high-moisture-content, high-cohesion waste soil according to claim 2, characterized in that, The three vacuum suction pipes (4) are connected to a vacuum pump, and the vacuum pumps (8) are spaced 270-300cm apart.

8. The high-efficiency dewatering pretreatment system for high-moisture-content, high-cohesion waste soil according to claim 3, characterized in that, The geotextile (5) and plastic sealing film (6) are laid 100-200cm beyond the perimeter of the sealing trench (7).

9. The high-efficiency dewatering pretreatment system for high-moisture-content, high-cohesion waste soil according to claim 4, characterized in that, The plastic drainage board (2) is equidistant from left to right and front to back with a spacing of 90-110cm; the plastic drainage board (2) is inserted into the garbage soil (3) to a depth exceeding the garbage soil (3) and exceeding the normal soil layer below the garbage soil (3) by 50cm.

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