CN100526571C - Biogas and leachate integrated pumping and drainage system for garbage landfill - Google Patents

Abstract

An integrated drainage system for biogas and leachate in a landfill site. Before the landfill site is put into use, the vertical shaft is built, and the multi-level and multi-branch shafts connected with the vertical shaft are laid sequentially from bottom to top along with the landfill operation. The collection and drainage channel is filled with water-conducting and gas-conducting gravel. The angle α between the multi-branch collecting and drainage channel and the vertical shaft gradually increases from bottom to top; Extraction device for extracting biogas and leachate. The multi-level and multi-branch collection and drainage channels at a certain angle to the horizontal plane laid radially in layers can improve the water permeability and air permeability inside the garbage body, and carry out the integrated collection and transportation of gas and liquid; through the divergent multi-level, multi- The branch collection and drainage channels converge to the central shaft to realize the accumulation of biogas and leachate, which is convenient for pumping and drainage. The structure of the whole system is simple, the collection efficiency of biogas and leachate is high, the construction is convenient, the engineering cost is low, and the later maintenance and management are convenient.

Description

Integrated drainage system for biogas and leachate in landfill

technical field

The invention relates to a garbage landfill system, in particular to a garbage landfill multi-branch biogas and leachate integrated pumping and drainage system.

Background technique

At present, biogas and leachate in landfills are pumped independently: biogas is pumped through pre-buried drainage pipes or vertical holes are drilled after the site is closed, and leachate is pumped from the bottom of the landfill. After the blind ditch is collected, it enters the liquid collection well and is pumped out. This independent pumping method requires separate engineering construction, and as the waste degrades, the particles in the leachate block the migration channels of gas and liquid, and the permeability of the waste body deteriorates, resulting in the extraction of biogas and leachate. The discharge effect becomes less than ideal.

Contents of the invention

The purpose of the present invention is to overcome the existing problems in the prior art and provide an integrated drainage system for biogas and leachate in landfill sites. Accelerates the stabilization process of landfills.

In order to achieve the above object, the technical solution of the present invention is: before the garbage landfill is put into use, the vertical shaft is built by masonry, and the multi-level and multi-branch collection and drainage channels connected with the vertical shaft are sequentially laid from bottom to top along with the landfill operation. The collection and drainage channels are filled with water- and gas-conducting gravel, and the angle α between the multi-branch collection and drainage channels and the vertical shaft gradually increases from bottom to top; An extraction device for the extraction of leachate.

The shaft is constructed of reinforced concrete materials, and the shaft wall is left with a multi-level, multi-branch collection and drainage channel to communicate with; the height l of the wellhead of the shaft above the closure of the landfill is 300-500mm; The height h between the bottom of the well and the bottom of the drainage layer is 3000-5000mm; the collection and drainage channel is composed of a plurality of end-to-end pupal baskets woven from biodegradable fiber materials; the multi-branch collection The angle α between the dredging channel and the horizontal plane of the shaft gradually increases from bottom to top is 5-15°; the exhaust device includes an air pump, connected to it and inserted into the exhaust pipe in the shaft, and the submerged sewage at the bottom of the shaft. The pump and the drainage pipe extending out of the well are formed; the sealing cover is provided with a suction hole for inserting the exhaust pipe and a drain hole for inserting the drainage pipe, and also has a socket for a water level monitor and a socket for a pressure monitor. hole.

Because the present invention adopts multi-level and multi-branch collection and drainage channels with a certain angle with the horizontal plane, the permeability inside the garbage body is improved, and it is more conducive to the transportation and transportation of gas and liquid in the garbage body. Since the multi-level and multi-branch collection and drainage channels can carry out the integrated collection and transportation of gas and liquid, the accumulation of biogas and leachate can be realized through the convergence of divergent multi-level and multi-branch collection and drainage channels to the central shaft , and pumped through the suction pump. The whole system has simple structure, convenient construction, low engineering cost, convenient maintenance and management in the later stage, and convenient monitoring and utilization of biogas and internal adjustment and treatment of leachate.

Description of drawings

Fig. 1 is a schematic top view structure diagram of the extraction system of the present invention.

Fig. 2 is a schematic diagram of the sectional structure along line A-A of Fig. 1 .

In the figure: 1-shaft, 2-drainage channel, 3-gravel, 4-drainage layer, 5-suction pump, 6-submersible sewage pump, 7-suction pipe, 8-drainage pipe, 9-sealing cover, 10- Air extraction hole, 11-drainage hole, 12-garbage, 13-water level monitoring hole, 14-pressure monitoring hole.

Detailed ways

The present invention will be further described below in conjunction with the embodiment in the accompanying drawings:

The pumping system of the present invention is a combination of a liquid collection well and a gas recovery well. As shown in Figure 2, it involves a shaft 1, a multi-branch collection and drainage channel 2, an air suction pump 5, a submersible sewage pump 6, an air suction pipe 7, and a drainage system. Tube 8, sealing cap 9. The construction of the vertical shaft 1 is completed before the landfill is put into use, and the height l of the wellhead above the closure of the landfill is 300-500mm; the height h between the bottom of the well and the bottom of the drainage layer 4 is 3000-5000mm. The shaft wall is constructed of reinforced concrete material with strong deformation resistance, and multiple horizontal holes are reserved in the shaft wall to communicate with the multi-branch collection and drainage channel 2 when the garbage 12 is landfilled. The submersible sewage pump 6 is located at the bottom of the well wall and links to each other with the drainage pipe 8 stretching out from the wellhead. The multi-branch collection and drainage channel 2 is composed of a plurality of pupal baskets connected end to end. The pupal baskets are made of biodegradable wood fiber materials with good water permeability and air permeability. The pupal baskets are filled with gravel 3 as air guide, The water-conducting medium is used for the integrated collection and drainage of biogas and leachate. As shown in Figure 1, the multi-branch collection and drainage channel 2 is arranged in a multi-level divergent shape, which increases the contact area with the garbage body, improves the permeability inside the garbage body, and is beneficial to the biogas and leachate in the garbage body. transport. The multi-branch collection and drainage channels 2 are successively laid on the surface of the garbage body from bottom to top with the operation of the landfill, which is beneficial to the collection of leachate and allows the leachate to flow into the shaft 1 under the action of gravity. When the multi-branch collection and drainage channel 2 is laid, it should form a certain angle with the horizontal plane. Considering the influence of the gradual increase in the settlement of the garbage body, the angle α between the multi-branch collection and drainage channel 2 and the horizontal plane also gradually increases from bottom to top. The size of the included angle α is determined by the settling parameters of the garbage 12, and is generally 5-15 degrees. The air extraction pump 5 pumps the collected biogas to the ground biogas power plant through the air extraction pipe 7, and the air intake holes of the air extraction pipe 7 are concentrated in the middle and lower part of the shaft. The submersible sewage pump 6 at the bottom of the shaft 1 lifts the collected leachate to the sewage treatment station on the ground through the drain pipe 8 . The wellhead of the shaft 1 is provided with a sealing cover 9, which is normally closed to block the exchange of outside air and internal gas and maintain an anaerobic environment; when the shaft 1 needs to be maintained or cleaned, the sealing cover 9 can be opened. The sealing cover 9 is provided with a suction hole 10 and a drainage hole 11 which can be freely opened and closed. When the biogas or leachate is pumped out, the corresponding suction hole of the sealing cover 9 is opened, and the suction pump 5 is connected with the suction pipe 7, the submersible Sewage pump 6 and exhaust pipe 8. In order to ensure the safe operation of the landfill, a hole 13 for inserting a water level monitor and a hole 14 for inserting a pressure monitor are also provided on the sealing cover.

Implementation process: Firstly, a shaft 1 with a reinforced concrete structure is built in the center of the landfill. The number of shafts 1 is set according to the shape and scale of the landfill. Layout, as shown in Figure 2; when multi-shaft 1 is set, it is evenly arranged near the periphery. The wellhead of vertical shaft 1 is 300-500mm higher than the expected closure height, and the bottom of the shaft wall is connected with the collection and drainage pipes in the blind ditch. 1, an exhaust pipe 7 and a drain pipe 8 are arranged. During the use of the landfill, as the height of the waste body increases, the multi-branch collection and drainage channels 2 that form a certain angle with the horizontal plane are laid radially in turn, and the shaft 1 is filled with gravel. After the landfill is closed, the wellhead of the shaft 1 is closed, the suction pipe 7 is connected to the suction pump 5, the drain pipe 7 is connected to the submersible sewage pump 6, and the collected landfill organisms are collected by the suction pump 5 and the submersible sewage pump 6. Gas and leachate are pumped to the ground.

Claims (7)

1, refuse landfill biogas and leachate integrated evacuation system, it is characterized in that: before refuse landfill is come into operation, build by laying bricks or stones and finish vertical shaft (1), lay the collection white-out passage (2) of communicate with vertical shaft (1) multilevel, multiple-limb from the bottom to top successively with the garbage loading embeading operation, collect the gravel (3) that is filled with water guide, air guide in the white-out passage (2), the collection white-out passage (2) of multilevel, multiple-limb increases from the bottom to top gradually with the horizontal plane angle α of vertical shaft (1); Vertical shaft (1) well head is provided with seal cover (9), and is provided with the exhaust device that biogas and percolate pump drainage can be fallen.

2, refuse landfill biogas according to claim 1 and leachate integrated evacuation system, it is characterized in that: described vertical shaft (1) is constructed by Reinforced Concrete Materials and is formed, and hoistway wall leaves with multilevel, multiple-limb and collects the mouth that white-out passage (2) is communicated with.

3, refuse landfill biogas according to claim 1 and 2 and leachate integrated evacuation system is characterized in that: the height l that described vertical shaft (1) well head exceeds the refuse landfill closing is 300-500mm.

4, refuse landfill biogas according to claim 1 and leachate integrated evacuation system is characterized in that: described collection white-out passage (2) is made of the pupa shape basket that a plurality of end to end, biodegradable fibrous material braidings form.

5, according to claim 1,2 or 4 described refuse landfill biogas and leachate integrated evacuation systems, it is characterized in that: the collection white-out passage (2) of described multilevel, multiple-limb is 5-15 ° with the angle α that the horizontal plane of vertical shaft (1) increases from the bottom to top gradually.

6, refuse landfill biogas according to claim 1 and leachate integrated evacuation system, it is characterized in that: described exhaust device comprises aspiration pump (5), link to each other with aspiration pump (5) and to insert stack (7) in the vertical shaft (1), the submersible sewage pump (6) that is located at vertical shaft (1) bottom stretches out outer gutter (8) formation of well with linking to each other with submersible sewage pump (6).

7, according to claim 1 or 6 described refuse landfill biogas and leachate integrated evacuation systems, it is characterized in that: described seal cover (9) is provided with aspirating hole (10) that inserts stack (7) and the drain hole (11) that inserts gutter (8), also is provided with the jack (13) of water-level instrumentation and the jack (14) of pressure monitor.

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