Collection system of garbage treatment plant

Abstract

A garbage treatment plant collection system comprises a garbage landfill pit formed through excavation, and a filtrate treatment tower arranged in the center of the garbage landfill pit is arranged in the garbage landfill pit; the collecting pipelines are uniformly arranged in the landfill pit, the leakage liquid and the waste gas can enter the collecting pipelines, partial sections of the collecting pipelines are located underground, and partial sections of the collecting pipelines extend out of the surface of the landfill pit; the underground collecting pipe network is arranged in a soil layer below the garbage landfill pit and is communicated with the filtrate treatment tower and each collecting pipeline at the same time; the exhaust pipe network is arranged at the position, close to the top, of the slope protection around the landfill pit, negative pressure is formed in the exhaust pipe network, the exhaust pipe network comprises a gas collection pipeline and a plurality of exhaust pipes, the exhaust pipes are evenly arranged around the top of the slope protection by a circle, and gas inlets of the exhaust pipes are higher than the top of the collection pipeline. The collecting system disclosed by the invention can be used for timely and efficiently collecting leachate and landfill gas generated in the landfill plant.

Description

Technical Field

[0001] The present invention belongs to the technical field of resource recovery in waste treatment plants, and particularly relates to a collection system for waste treatment plants. Background Art

[0002] Currently, the treatment methods for domestic waste are mainly divided into sanitary landfill, incineration, and composting. Among them, sanitary landfill refers to the landfill disposal of urban garbage and waste in a sanitary landfill site.

[0003] Generally, after selecting a sanitary landfill site around the city, the landfill is excavated, and a high-density polyethylene geomembrane is laid at the bottom of the landfill. The high-density polyethylene geomembrane isolates the garbage from the surrounding environment, ensuring that the leachate is collected and treated, and preventing pollution to the groundwater and soil environment.

[0004] After the garbage landfill is filled with garbage, the soil is backfilled, covering and burying the garbage with the backfilled soil, and green plants are planted on the backfilled soil to form a green space at the garbage landfill.

[0005] After the garbage is dumped, on the one hand, the garbage itself contains leachate, and on the other hand, after rain and snow weather, rain and snow water enters the garbage and generates leachate. The composition of the leachate is complex, and it will have an impact on the surrounding ecological environment after entering the surrounding soil layer. At the same time, a large amount of landfill gas will be generated due to microbial decomposition in the garbage. The landfill gas mainly includes methane, carbon dioxide, and some other components. Discharging the landfill gas into the air will not only exacerbate the greenhouse effect but also affect the living environment and cause air pollution. Summary of the Invention

[0006] The present invention provides a collection system for a waste treatment plant to solve the problem that the leachate and landfill gas in the waste landfill affect the environment.

[0007] To solve the above technical problems, the technical solution adopted by the present invention is: A collection system for a waste treatment plant, including a garbage landfill pit formed by excavation, characterized in that: the following are provided in the garbage landfill pit: A filtrate treatment tower, arranged at the center of the garbage landfill pit; Collection pipes, into which leachate and waste gas can enter. Several of the collection pipes are uniformly arranged in the garbage landfill pit. Part of the collection pipes are located underground, and part of the collection pipes extend out of the surface of the garbage landfill pit; An underground collection pipe network, arranged in the soil layer below the garbage landfill pit, and at the same time connected to the filtrate treatment tower and each collection pipe. A slope inclined downward from the edge of the garbage landfill pit towards the filtrate treatment tower is formed in the underground collection pipe network; An exhaust pipe network is arranged at a position near the top of the slope protection around the landfill pit. A negative pressure is formed in the exhaust pipe network, which includes a gas collection pipe and several exhaust pipes. The exhaust pipes are evenly arranged in a circle around the top of the slope protection, and the air inlet of the exhaust pipe is higher than the top of the collection pipe.

[0008] Furthermore, the underground collection pipe network includes a main branch pipe and several branch pipes. The branch pipes divergently communicate with the periphery of the main branch pipe, and the main branch pipe is arranged in a circumferentially divergent manner centered on the filtrate treatment tower.

[0009] Furthermore, the landfill pit is divided into multiple landfill areas. A partition slope protection is arranged between each landfill area, and an independent filtrate treatment tower, collection pipe, underground collection pipe network and exhaust pipe network are arranged in each landfill area.

[0010] Furthermore, a horticultural cultivation area is arranged on the surface of the slope protection on the side of the landfill pit away from the inside of the pit. The gas collection pipe is used to supply heat to the horticultural cultivation area.

[0011] Furthermore, the gas collection pipe includes a heat supply pipe. The heat supply pipe penetrates through the slope protection of the landfill pit, and a connecting pipe is arranged on the side of the landfill pit away from the inside of the pit between adjacent two heat supply pipes. Plants are planted in the area between the connecting pipes.

[0012] Furthermore, the collection pipe includes a first pipe section and a second pipe section. The second pipe section is buried underground, and the first pipe section is detachably installed on the top of the second pipe section; A detachable sealing film is arranged on the inner wall of the second pipe section, and a sealing cover is lapped on the top.

[0013] Furthermore, the underground collection pipe network is arranged on the ground surface of the landfill pit and covered with soil. A high-density polyethylene geomembrane is laid on the surface of the landfill pit.

[0014] Furthermore, one end of the second pipe section is communicated with the underground collection pipe network, and the other end is flush with the ground. The high-density polyethylene geomembrane is sealed with the inner wall of the second pipe section; An anchoring seat is cast on the periphery of the section of the second pipe section located between the underground collection pipe network and the ground.

[0015] Furthermore, several reinforcing guiding plates are circumferentially fixed around the side wall of the first pipe section. The reinforcing guiding plates are at the same height as the section of the collection pipe extending out of the surface of the landfill pit, and the width of the reinforcing guiding plates gradually widens from the top to the bottom; Percolation holes are arranged in the area of the collection pipe between adjacent two reinforcing guiding plates.

[0016] Further, the gas collecting pipeline is arranged around the side of the landfill pit facing the inside of the pit, and the gas collecting pipeline is connected to multiple main branch pipes at the same time; A gas transmission pipe is connected between the gas collecting pipeline and each exhaust pipe, and a gas purification device is arranged at a position close to the outlet end of the exhaust pipe.

[0017] The present invention can achieve the following beneficial effects: 1. In the present application, a filtrate treatment tower is arranged in the center of the landfill pit, and exhaust pipes are arranged on the peripheral side. The collection pipes are evenly arranged in the landfill pit. Thus, the leachate and landfill gas in the piled garbage can be collected and summarized through the collection pipes, and the leachate is collected into the filtrate treatment tower through the underground collection pipe network, and the landfill gas is transported into the exhaust pipe network through the underground collection pipe network. Therefore, the collection and recovery of leachate and landfill gas are realized, and the leakage of leachate into the soil layer to pollute the formation and the diffusion of landfill gas into the atmosphere to pollute the atmosphere are reduced.

[0018] 2. Arranging a horticultural cultivation area on the peripheral side of the landfill pit can use the heat in the landfill gas to supply heat to the planted plants, thus realizing high-yield cultivation in the horticultural cultivation area and shortening the planting cycle of the horticultural cultivation area; in addition, arranging the horticultural cultivation area can beautify the environment on the peripheral side of the landfill pit and realize ecological landfill.

[0019] 3. Strengthening guide plates are arranged on the peripheral side of the collection pipe, and the strengthening guide plates are arranged in a conical shape. Thus, when dumping garbage, the garbage can be piled up around the collection pipe under the guiding action of the strengthening guide plates, forming a space between the side wall of the collection pipe and the garbage, so that the leachate can be collected into the collection pipe through the percolation holes, and it is not easy for the garbage to block the percolation holes; in addition, the strengthening guide plates can enhance the strength of the collection pipe, so that when the garbage is piled up above the collection pipe, the garbage is not easy to bend the collection pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present invention will be further described below with reference to the drawings and embodiments: Figure 1 It is a plan view of the collection system of a garbage treatment plant of the present invention for showing the underground collection pipe network; Figure 2 It is a plan view of the collection system of a garbage treatment plant of the present invention for showing the collection pipes; Figure 3 It is a schematic diagram of the present invention for showing the installation effect of the second pipe section; Figure 4 It is a schematic diagram of the present invention for showing the structures of the first pipe section and the second pipe section Figure 5 It is a partial sectional view of the landfill pit of the present invention; Figure 6Partial sectional view of the horticultural cultivation area arranged on the periphery of the landfill pit of the present invention; Figure 7 Effect diagram of the present invention with multiple landfill areas arranged.

[0021] In the drawings, the list of components represented by each reference numeral is as follows: 1. Landfill pit; 11. Landfill area; 12. Partition slope protection; 2. Filtrate treatment tower; 3. Collection pipeline; 31. First pipe section; 32. Second pipe section; 33. Reinforcing guide plate; 34. Leakage holes; 35. Sealing film; 4. Underground collection pipe network; 41. Main branch pipe; 42. Branch pipe; 5. Exhaust pipe network; 51. Gas collection pipeline; 52. Exhaust pipe; 53. Heating pipe; 54. Connecting pipe; 55. Gas transmission pipe; 6. Horticultural cultivation area; 7. Anchor seat; 100. Slope protection. Specific embodiments

[0022] To facilitate the understanding of the present application, the present application will be described more comprehensively below with reference to the relevant drawings. Embodiments of the present application are shown in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, these embodiments are provided to make the disclosure of the present application more thorough and comprehensive.

[0023] As Figures 1 to 7 shown, a collection system of a waste treatment plant includes a landfill pit 1 formed by excavation. The landfill pit 1 is used to load municipal domestic waste. When constructing the landfill pit 1, a filtrate treatment tower 2, an underground collection pipe network 4, an exhaust pipe network 5 and a collection pipeline 3 are arranged in the landfill pit 1. The leachate and landfill gas are collected through the collection pipeline 3. The leachate and landfill gas enter the underground collection pipe network 4. The leachate converges into the filtrate treatment tower 2 through the underground collection pipe network 4, and the landfill gas is collected into the exhaust pipe network 5. Specifically, a negative pressure is formed in the exhaust pipe network 5 to provide the power for the landfill gas to enter the exhaust pipe network 5 from the underground collection pipe network 4.

[0024] The filtrate treatment tower 2 is arranged at the center of the landfill pit 1. Specifically, during construction, continue to excavate downward at the center bottom of the landfill pit 1 to form an installation hole for the filtrate treatment tower 2. After the filtrate treatment tower 2 is installed, backfill the side trench. Part of the filtrate treatment tower 2 is buried underground, and part is located above the landfill pit 1. The depth of the filtrate treatment tower 2 buried underground is determined according to the laying depth of the underground collection pipe network 4 and the amount of leachate treatment. After collecting the leachate, the filtrate treatment tower 2 can purify the leachate and then discharge it. Since part of the filtrate treatment tower 2 extends out of the ground, it is convenient for maintenance personnel to enter the filtrate treatment tower 2 for maintenance or to check the operation status. The filtration and purification equipment in the filtrate treatment tower 2 can, after five or six years of landfill, when the garbage is substantially degraded and stabilized, lift the top cover of the filtrate treatment tower 2 and lift out the filtration and purification equipment in the filtrate treatment tower 2 for recycling. In addition, the landfill situation can also be judged by the amount of leachate collected in the filtrate treatment tower 2. When the amount of leachate collected is zero, the equipment in the filtrate treatment tower 2 can be removed. Among them, the filtration and purification equipment in the filtrate treatment tower 2 is prior art and will not be described in detail here.

[0025] Multiple collection pipes 3 are evenly arranged in the landfill pit 1. One end of each collection pipe 3 extends out of the surface of the landfill pit 1, and the other end is buried underground and is connected to the underground collection pipe network 4 at the bottom. Thus, the recovery of leachate and landfill gas in the dumped garbage is realized through the collection pipes 3. Specifically, the collection pipe 3 includes a first pipe section 31 and a second pipe section 32. The second pipe section 32 is buried underground and its top is flush with the ground. The first pipe section 31 is detachably installed on the second pipe section 32. A tearable sealing film 35 is arranged in the second pipe section 32, and a sealing cover is lapped at the pipe orifice.

[0026] Since it takes many years to fill the landfill pit 1, some areas will be vacant for one or several years. Therefore, only the second pipe section 32 is installed during the construction of the collection pipe 3. The sealing film 35 and the sealing cover arranged on the second pipe section 32 can reduce foreign objects from entering the collection pipe 3. At the same time, since a negative pressure is formed in the underground collection pipe network 4, when the corresponding area is not landfilled with garbage, the collection pipe 3 in the corresponding area can be closed through the sealing film 35 to reduce the energy consumption for forming the required negative pressure in the underground collection pipe network 4 and save energy.

[0027] When it is necessary to landfill garbage in the corresponding area, the sealing film 35 can be torn off, and the first pipe section 31 can be installed into the second pipe section 32, so as to realize the installation and use of the collection pipeline 3. Specifically, the first pipe section 31 can be inserted into the second pipe section 32 and is threadedly connected to the inner wall of the second pipe section 32. A number of reinforcing guide plates 33 are circumferentially and fixedly arranged on the side wall of the first pipe section 31. The reinforcing guide plates 33 are at the same height as the section of the collection pipeline 3 extending out of the surface of the garbage landfill pit 1, and the width of the reinforcing guide plates 33 gradually widens from the top to the bottom, so as to form a conical guide surface on the periphery of the collection pipeline 3. In addition, filtering holes 34 are provided in the area between two adjacent reinforcing guide plates 33 of the collection pipeline 3, and leachate and landfill gas enter the underground collection pipe network 4 through the filtering holes 34.

[0028] By arranging the reinforcing guide plates 33 on the periphery of the collection pipeline 3, on the one hand, the strength of the collection pipeline 3 can be enhanced, and when the garbage is piled on the top of the collection pipeline 3, it is not easy to bend or deform the collection pipeline 3; on the other hand, the reinforcing guide plates 33 are conical, and when the garbage is dumped, it can guide the garbage dumped from above, so that the garbage is piled on the periphery of the reinforcing guide plates 33, and it is not easy to accumulate on the periphery of the filtering holes 34, thereby reducing the possibility of blocking the filtering holes 34.

[0029] After the excavation of the garbage landfill pit 1 is completed, a trench is excavated downward at the bottom of the pit to realize the construction of the underground collection pipe network 4. The underground collection pipe network 4 includes a plurality of main branch pipes 41, and a number of branch pipes 42 are connected to each main branch pipe 41. The plurality of main branch pipes 41 are connected to the periphery of the filtrate treatment tower 2 and communicate with the filtrate treatment tower 2; the main branch pipes 41 are circumferentially and spaced apart around the filtrate treatment tower 2, and the branch pipes 42 are connected to the periphery of the main branch pipes 41 in a dendritic shape, and each collection pipeline 3 communicates with the underground collection pipe network 4 below. In addition, the underground collection pipe network 4 as a whole has a slope that slopes downward from the edge of the garbage landfill pit 1 towards the filtrate treatment tower 2, so that the collected leachate can be smoothly collected into the filtrate treatment tower 2 along the underground collection pipe network 4.

[0030] The underground collection pipe network 4 and the exhaust pipe network 5 are constructed simultaneously. The exhaust pipe network 5 includes a gas collection pipe 51 and several exhaust pipes 52. The gas collection pipe 51 is arranged around the bottom of the slope protection 100 around the landfill pit 1, and each main branch pipe 41 is communicated with the gas collection pipe 51. The gas collection pipe 51 can be arranged underground or laid on the ground. Several exhaust pipes 52 are installed on the top of the slope protection 100, and multiple exhaust pipes 52 are arranged at intervals around the top of the slope protection 100; a gas transmission pipe 55 is arranged between each exhaust pipe 52 and the gas collection pipe 51, and the gas transmission pipe 55 is laid along the slope protection 100; a gas purification device is arranged at the position close to the gas outlet end of each exhaust pipe 52. Through the gas purification device, the preliminary purification and filtration of the landfill gas can be realized, so that the pollutants in the landfill gas can be removed and then discharged into the atmosphere. The gas purification device is a prior art and not the focus of improvement of this application, so the relevant structure is not drawn or described in detail. An air suction device is arranged in the exhaust pipe network 5. Through the air suction device, a negative pressure is formed in the underground collection pipe network 4, so as to realize the control of the flow path of the landfill gas, so that the landfill gas can move along the underground collection pipe network 4 to the exhaust pipe network 5 and be discharged. In addition, the air inlet of the exhaust pipe 52 is higher than the top of the collection pipe 3. Since methane in the landfill gas is lighter than air, there is a tendency to flow upward. Designing the exhaust pipe 52 to be higher can guide the landfill gas to move and be discharged to the exhaust pipe network 5 to assist the air suction device to work and reduce the power consumption of the air suction device.

[0031] In a preferred embodiment, the gas collection pipe 51 further includes a heating pipe 53. The heating pipe 53 passes through the slope protection 100 of the landfill pit 1, and a connecting pipe 54 is arranged on the side of the landfill pit 1 away from the pit inside between two adjacent heating pipes 53 at the same elevation. In addition, a horticultural cultivation area 6 is arranged on the surface of the slope protection 100 on the side of the landfill pit 1 away from the pit inside. The plants in the horticultural cultivation area 6 are planted in the area between the connecting pipe 54 and the heating pipe 53; due to the long stacking time of the kitchen waste in a local area, heat can be generated by internal corrosion, and then the generated landfill gas also carries heat. The heat can be transported to the slope protection 100 through the heating pipe 53, so as to accelerate the growth rate of the horticultural cultivation area 6. However, this embodiment is only applicable to the areas with long cold weather in the north to assist the cultivation of municipal flowers, and at the same time can beautify the environment on the side of the landfill pit 1 and construct an ecological landfill pit 1.

[0032] After the underground collection pipeline network 4 and the exhaust pipeline network 5 are both buried, earthwork backfilling is carried out to cover the underground collection pipeline network 4 and the exhaust pipeline network 5. After the earthwork is backfilled and compacted, an anchoring seat 7 is cast with concrete on the periphery of the section of the second pipe segment 32 located between the underground collection pipeline network 4 and the ground to enhance the installation strength of the second pipe segment 32. After the construction of the anchoring seat 7 is completed, a high-density polyethylene geomembrane is laid on the surface of the landfill pit 1. The garbage and the underground soil layer are isolated by the high-density polyethylene geomembrane to reduce the leakage of pollutants in the garbage into the soil layer and pollute the surrounding environment. It should be noted that at the connection between the high-density polyethylene geomembrane and the second pipe segment 32, a hot-melt sealing treatment is required. The high-density polyethylene geomembrane is wound down along the inner wall of the second pipe segment 32 for a certain length, and the high-density polyethylene geomembrane and the side wall of the second pipe segment 32 are sealed to reduce the possibility of leakage of the high-density polyethylene geomembrane on the periphery of the second pipe segment 32. After the high-density polyethylene geomembrane is laid, garbage can be dumped.

[0033] If the area of the landfill pit 1 is large, making it difficult to lay the underground collection pipeline network 4, or the treatment capacity of the filtrate treatment tower 2 and the exhaust pipeline network 5 is difficult to meet, the landfill pit 1 can be divided into multiple landfill areas 11. A partition slope protection 12 is provided between each landfill area 11, and an independent filtrate treatment tower 2, a collection pipeline 3, an underground collection pipeline network 4 and an exhaust pipeline network 5 are provided in each landfill area 11, so as to realize the efficient recovery and treatment of leachate and landfill gas.

[0034] The above are only the preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A waste treatment plant collection system, comprising a waste landfill pit (1) formed by excavation, characterized in that: The garbage landfill pit (1) is provided with: A filtrate treatment tower (2) is arranged at the center of the landfill pit (1); A collection pipe (3), wherein the leaked liquid and waste gas can enter the collection pipe (3), wherein a plurality of the collection pipes (3) are evenly arranged in the garbage landfill pit (1), wherein part of the collection pipe (3) is located underground and part of the collection pipe (3) extends out of the surface of the garbage landfill pit (1); An underground collection pipe network (4) is arranged in the soil layer below the garbage landfill pit (1) and is connected to the filtrate treatment tower (2) and each of the collection pipes (3); a slope is formed in the underground collection pipe network (4) that inclines downward from the edge of the garbage landfill pit (1) toward the filtrate treatment tower (2); An exhaust pipe network (5) is arranged near the top of a slope protection (100) around a landfill pit (1), wherein negative pressure is formed in the exhaust pipe network (5), and comprises an air collecting pipe (51) and a plurality of exhaust pipes (52), wherein the exhaust pipes (52) are evenly arranged in a circle around the top of the slope protection (100), and an air inlet of the exhaust pipe (52) is higher than the top of the collecting pipe (3).

2. A garbage treatment plant collection system according to claim 1, characterized in that: The underground collection pipe network (4) comprises a main branch pipe (41) and a plurality of branch pipes (42), wherein the branch pipes (42) diverge and are connected to the circumference of the main branch pipe (41), and the main branch pipe (41) is arranged to diverge circumferentially with the filtrate treatment tower (2) as the center.

3. A garbage disposal plant collection system according to claim 1, characterized in that: The garbage landfill pit (1) is divided into a plurality of landfill areas (11), a separation slope protection (12) is provided between each of the landfill areas (11), and each landfill area (11) is provided with an independent filtrate treatment tower (2), a collection pipeline (3), an underground collection pipe network (4) and an exhaust pipe network (5).

4. A garbage disposal plant collection system according to claim 1, characterized in that: A horticultural cultivation area (6) is provided on the surface of the side slope protection (100) of the garbage landfill pit (1) away from the pit, and the gas collecting pipeline (51) is used to supply heat to the horticultural cultivation area (6).

5. A garbage disposal plant collection system according to claim 4, characterized in that: The gas collecting pipeline (51) comprises a heating pipe (53), the heating pipe (53) passing through the slope protection (100) of the garbage landfill pit (1), and a connecting pipe (54) is provided between two adjacent heating pipes (53) on a side of the garbage landfill pit (1) away from the pit, and plants are planted in the area between the connecting pipes (54).

6. A garbage disposal plant collection system according to claim 1, characterized in that: The collecting pipe (3) comprises a first pipe section (31) and a second pipe section (32), the second pipe section (32) being buried underground, and the first pipe section (31) being detachably mounted on the top of the second pipe section (32); The inner wall of the second pipe section (32) is provided with a detachable sealing membrane (35), and the top is overlapped with a sealing cover.

7. A garbage disposal plant collection system according to claim 6, characterized in that: The underground collection pipe network (4) is arranged on the surface of the garbage landfill pit (1) and is covered with soil, and the surface of the garbage landfill pit (1) is paved with a high-density polyethylene geomembrane.

8. A garbage disposal plant collection system according to claim 7, characterized in that: One end of the second pipe section (32) is connected to the underground collection pipe network (4), and the other end is flush with the ground, and a high-density polyethylene geomembrane and the inner wall of the second pipe section (32) are sealed; Anchor seats (7) are cast around the periphery of the section of the second pipe section (32) located between the underground collection pipe network (4) and the ground.

9. A garbage disposal plant collection system according to claim 6, characterized in that: A plurality of reinforcing guide plates (33) are fixedly disposed around the side wall of the first pipe section (31), the reinforcing guide plates (33) being at the same height as the section of the collecting pipe (3) extending out of the surface of the garbage landfill pit (1), and the width of the reinforcing guide plates (33) gradually widens from the top to the bottom; The collection pipe (3) is provided with a percolation hole (34) in a region between two adjacent reinforcing guide plates (33).

10. A garbage disposal plant collection system according to claim 2, characterized in that: The gas collecting pipeline (51) is disposed around a side of the garbage landfill pit (1) facing the pit, and the gas collecting pipeline (51) is simultaneously connected to a plurality of the main branch pipes (41); A gas delivery pipe (55) is connected between the gas collecting pipeline (51) and each of the exhaust pipes (52), and a gas purification device is provided near the outlet end of the exhaust pipe (52).

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