Integrated Gas Conduction - Liquid Drainage Device and Method for Rigid Landfill

Abstract

The present invention provides a gas-guide and liquid-drain integrated device and method for a rigid landfill, including a drainage pipe and a liquid-drain device. A bent pipe with a downward outlet is connected to the side end of the drainage pipe. One end of the liquid-drain device is connected to an external drainage pump. When it is detected that the height of the leachate in the leachate sump exceeds the threshold, the other end of the liquid-drain device is lowered to the drainage pipe for drainage. The present invention can automatically drain landfill gas while draining leachate.

Description

Technical Field

[0001] The present invention relates to the field of hazardous waste treatment and technology, and in particular to a rigid landfill gas conduction and liquid drainage integrated device and method. Background Art

[0002] In the rigid landfill technology for hazardous waste, leachate and gas will be generated in the landfill unit. Conventional drainage technology installs a drainage pipe system at the bottom of the landfill unit. The disadvantage is that there is a designed leakage point at the bottom of the landfill unit. Because the drainage pipe needs to pass through the reinforced concrete structure layer at the bottom of the landfill unit, the reinforced concrete bottom structure layer needs to be designed with reserved openings. The cracking and sealing of the openings will increase the potential risk of leakage. At the same time, the leachate generated will cause serious corrosion to the drainage pipes and valves, and the corrosion will cause leakage of the pipes and valves. The above leakage risks can cause environmental pollution of soil, water, etc. Summary of the invention

[0003] The present application provides an integrated gas guiding and drainage device and method for a rigid landfill, which solves the problem of high probability of leachate leakage in existing landfill units while taking into account the guiding and drainage of landfill gas.

[0004] Rigid landfill gas-drainage integrated device, including

[0005] A drainage pipe is arranged near the side wall of the landfill unit, and is fixed to the bottom of the leachate collection well after passing through the closure unit and the landfill material layer in the landfill unit from top to bottom. A plurality of holes are evenly opened on the pipe wall of the drainage pipe located on the lower side of the top plate of the closure unit, and a side end of the drainage pipe located on the upper side of the closure unit is connected to a bent pipe with a downward outlet;

[0006] A liquid discharge device, one end of which is connected to an external drainage pump;

[0007] When it is detected that the height of the leachate in the leachate collection well exceeds a threshold value, the other end of the drainage device is lowered to the drainage pipe for drainage.

[0008] The present invention can reduce the probability of leakage of leachate in the landfill unit and the risk of environmental pollution, and can automatically drain landfill gas while draining the leachate, thereby reducing engineering costs.

[0009] Preferably, the top end of the drainage pipe is connected with a reducing tee, the top end of the reducing tee is detachably connected with a movable end cap, and the side end is connected with the elbow to realize automatic drainage of landfill gas.

[0010] Preferably, the diameter of the side end of the reducing tee is smaller than the diameter of the other two ends, so as to facilitate the discharge of landfill gas.

[0011] Preferably, the elevation of the reducing tee is lower than the top height of the parapet, and the distance between the elbow and the top plate of the enclosure unit is not less than 30 cm, so as to facilitate the drainage of landfill gas.

[0012] Preferably, the drainage pipe is provided with a waterproof sleeve at a position located on the top plate of the enclosure unit, the upper end of the drainage pipe is fixed by a bracket, the bracket comprises a connecting pipe, a clamp sleeved on the outside of the drainage pipe and an embedded part preset on the side wall of the landfill unit, one end of the clamp is fixed to the embedded part through a connecting pipe, and the above structure can be used to fix the drainage pipe at a position close to the side wall of the landfill unit.

[0013] Preferably, the drainage pipe is a HDPE pipe, which has good chemical corrosion resistance and wear resistance.

[0014] Preferably, an impermeable layer is laid inside the leachate collection well, the impermeable layer includes a geosynthetic single-sided composite drainage net, a pebble layer and an impermeable membrane, the bottom of the drainage pipe is fixed in the pebble layer, the pebble layer is used to fix the drainage pipe, and the geosynthetic single-sided composite drainage net is used for back filtration.

[0015] Preferably, the drainage pump is a mobile self-priming pump for discharging the leachate out of the landfill unit in a timely manner.

[0016] The drainage method of rigid landfill gasification and drainage includes:

[0017] The landfill waste gas is automatically drained by drainage pipes and elbows at the side ends of the drainage pipes, and the leachate is drained by a combination of drainage pipes, drainage devices and external drainage pumps.

[0018] The outlet of the curved pipe is downward, and a plurality of holes are evenly opened on the pipe wall of the drainage pipe located at the lower side of the top plate of the enclosure unit. The above method can automatically drain the landfill gas while draining the leachate.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1. Compared with the bottom drainage of leachate, the present invention reduces the risk of leakage of hazardous waste leachate from the reserved holes at the bottom of the landfill cells and the pipe connections.

[0021] 2. The present invention can automatically drain landfill gas while draining leachate, thereby reducing engineering costs.

[0022] 3. The present invention adopts upper drainage of leachate to reduce the overall height of the visual leak detection chamber of the landfill unit and greatly reduce the use of fixed drainage pipes and valves. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solution of the present application, the drawings required for use in the embodiments are briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0024] Figure 1 It is a structural schematic diagram of the landfill unit of the present invention;

[0025] Figure 2 It is a schematic diagram of the overall structure of the present invention;

[0026] Figure 3 It is a plan view of the leachate collection well of the present invention;

[0027] Figure 4 It is a schematic structural diagram of the anti-seepage layer of the present invention;

[0028] Figure 5 Schematic diagram of the structure of the support of the present invention.

[0029] Illustration Description:

[0030] Among them, 1 landfill unit, 11 closure unit, 12 landfill material layer, 13 leachate collection well, 131 anti-seepage layer, 1311 geotextile single-sided composite drainage net, 1312 pebble layer, 1313 anti-seepage membrane, 2 drainage pipes, 21 channels, 3 elbows, 4 reducing tees, 5 movable end caps, 6 waterproof casings, 7 brackets, 71 connecting pipes, 72 clamps, and 73 embedded parts. DETAILED DESCRIPTION

[0031] See also Figure 1 , is a schematic diagram of the structure of the landfill unit 1. The landfill unit 1 includes a sealing unit 11, a landfill material layer 12 and a leachate collection well 13 from top to bottom, and an impermeable layer 131 is laid inside the leachate collection well 13. Figure 4 The anti-seepage layer 131 shown includes a geosynthetic single-sided composite drainage net 1311, a pebble layer 1312 and an anti-seepage membrane 1313. The anti-seepage membrane 1313 is made of a whole piece of material and no welding seams are allowed. A drainage pipe 2 is set near the side wall of the landfill unit 1. The drainage pipe 2 uses a HDPE pipe with good chemical corrosion resistance and wear resistance. The upper drainage is used to reduce the overall height of the visual leak detection room of the landfill unit 1, and can also greatly reduce the application of fixed drainage pipes and valves.

[0032] See also Figure 2-5 , a rigid landfill gas guide and drainage integrated device, including a guide and drainage pipe 2 and a drainage device.

[0033] The drainage pipe 2 passes through the closure unit 11 and the landfill material layer 12 from top to bottom and then extends to the inside of the leachate collection well 13. The bottom of the drainage pipe 2 is fixed by a pebble layer 1312, and the bottom of the pipe is made of a perforated blind plate. Figure 5 As shown, the upper end of the drainage pipe 2 is fixed by a bracket 7, which includes a connecting pipe 71, a clamp 72 sleeved on the outside of the drainage pipe 2, and an embedded part 73 preset on the side wall of the landfill unit 1. One end of the clamp 72 is fixed to the embedded part 73 through the connecting pipe 71. If the embedded part 73 is located at the top of the partition wall and penetrates the wall top anti-seepage material, expansion bolts and gaskets should be used around the perforated part of the anti-seepage material to anchor it to avoid leakage. Figure 2 As shown, the drainage pipe 2 is provided with a waterproof sleeve 6 at the position located on the top plate of the enclosure unit 11, and a trumpet-shaped sealing sleeve is provided at the position penetrating the anti-seepage membrane of the enclosure unit 11.

[0034] The top of the drainage pipe 2 is connected with a reducing tee 4, the top of which is detachably connected with a movable end cap 5 for rainproofing, and the side end is connected with a curved pipe 3. The pipe diameter of the side end of the reducing tee 4 is smaller than the pipe diameter of the other two ends, the elevation of the reducing tee 4 is lower than the top height of the parapet wall, and the distance between the curved pipe 3 and the top plate surface of the closure unit 11 is not less than 30 cm, which is convenient for the drainage of landfill gas; the drainage pipe 2 is evenly provided with a plurality of channels 21 on the pipe wall located on the lower side of the top plate of the closure unit 11, and the landfill gas and leachate enter the interior of the drainage pipe 2 through the channels 21.

[0035] One end of the drainage device is connected to an external drainage pump, which is a mobile self-priming pump. The leachate well 13 is detected by a liquid level meter to detect the height of the leachate, and the other end of the drainage device is lowered into the drainage pipe 2 for drainage. The drainage device is a water suction pipe.

[0036] Embodiment 2: A method for guiding gas and draining liquid from a rigid landfill, comprising:

[0037] The landfill waste gas is automatically drained by the drainage pipe 2 and the elbow 3 at the side end of the drainage pipe 2, and the leachate is drained by the drainage pipe 2, the drainage device and the external drainage pump.

[0038] The outlet of the curved pipe 3 is downward, and a plurality of channels 21 are evenly opened on the pipe wall of the drainage pipe 2 located at the lower side of the top plate of the enclosure unit 11 .

[0039] The specific implementation steps are:

[0040] Step 1: Open the reducing tee 4 at the bottom of the movable end cap, lower the portable liquid level meter, and detect whether there is leachate generated and the liquid level in the leachate collection well;

[0041] Step 2: If leachate is detected and reaches a certain level, lower the drainage device, and connect the other end of the drainage device to a mobile leachate drainage pump to drain the leachate generated in the leachate collection well out of the landfill unit. The small-diameter side of the reducing tee 4 is connected to the corresponding pipe elbow 3, and the elbow 2 is bent downward to drain the landfill gas generated inside the landfill unit 1.

[0042] Similar parts between the embodiments provided in this application can be referenced to each other. The specific implementation methods provided above are only a few examples under the general concept of this application and do not constitute a limitation on the protection scope of this application. For those skilled in the art, any other implementation methods expanded based on the scheme of this application without creative work belong to the protection scope of this application.

Claims

1. Rigid landfill gas guide and drainage integrated device, It is characterized in that include: A drainage pipe (2) is arranged at a position close to the side wall of the landfill unit (1); the drainage pipe (2) passes through the closure unit (11) and the landfill material layer (12) in the landfill unit (1) from top to bottom in sequence and is then fixed to the bottom of the leachate collection well (13); a plurality of holes (21) are evenly opened on the pipe wall of the drainage pipe (2) located below the top plate of the closure unit (11); and a curved pipe (3) with a downward outlet is connected to the side end of the drainage pipe (2) located above the closure unit (11); A liquid discharge device, one end of which is connected to an external drainage pump; When it is detected that the height of the leachate in the leachate collection well (13) exceeds a threshold value, the other end of the drainage device is lowered into the drainage pipe (2) for drainage; an impermeable layer (131) is laid inside the leachate collection well (13), the impermeable layer (131) comprising a geotechnical single-sided composite drainage net (1311), a pebble layer (1312) and an impermeable membrane (1313), the impermeable membrane (1313) being made of a whole piece of material and no welds are allowed; the bottom of the drainage pipe (2) is fixed in the pebble layer (1312), and the bottom of the drainage pipe (2) is fixed by the pebble layer (1312); The drainage pipe (2) is sleeved with a waterproof sleeve (6) at a position located on the top plate of the enclosure unit (11), and a trumpet-shaped sealing sleeve is formed at the anti-seepage membrane of the enclosure unit (11); the upper end of the drainage pipe (2) is fixed by a bracket (7), and the bracket (7) comprises a connecting pipe (71), a clamp (72) sleeved on the outside of the drainage pipe (2), and an embedded part (73) preset on the side wall of the landfill unit (1), and one end of the clamp (72) is fixed to the embedded part (73) through the connecting pipe (71); when the embedded part (73) is located at the top of the partition wall and penetrates the wall top anti-seepage material, expansion bolts and gaskets are provided around the perforated part of the anti-seepage material to anchor it; The top end of the drainage pipe (2) is connected to a reducing tee (4), the top end of the reducing tee (4) is detachably connected to a movable end cap (5), the side end of the reducing tee (4) is connected to the elbow (3), the elevation of the reducing tee (4) is lower than the top height of the parapet, and the distance between the elbow (3) and the top plate surface of the enclosure unit (11) is not less than 30 cm.

2. The rigid landfill gas guide and liquid drainage integrated device according to claim 1, It is characterized in that The pipe diameter at the side end of the reducing tee (4) is smaller than the pipe diameters at the other two ends.

3. The rigid landfill gas guide and liquid drainage integrated device according to claim 1, It is characterized in that The drainage pipe (2) is a HDPE pipe.

4. The rigid landfill gas guide and liquid drainage integrated device according to claim 1, It is characterized in that The drainage pump is a mobile self-priming pump.

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