CN111822478B - Landfill gas horizontal cross well gas collection and reverse seepage filtrate discharge system and method - Google Patents
Landfill gas horizontal cross well gas collection and reverse seepage filtrate discharge system and method Download PDFInfo
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- CN111822478B CN111822478B CN202010652751.7A CN202010652751A CN111822478B CN 111822478 B CN111822478 B CN 111822478B CN 202010652751 A CN202010652751 A CN 202010652751A CN 111822478 B CN111822478 B CN 111822478B
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- 239000000706 filtrate Substances 0.000 title claims abstract description 20
- 238000000034 method Methods 0.000 title claims abstract description 19
- 230000001681 protective effect Effects 0.000 claims abstract description 13
- 239000004568 cement Substances 0.000 claims description 21
- 238000001514 detection method Methods 0.000 claims description 10
- 239000000463 material Substances 0.000 claims description 4
- 239000004746 geotextile Substances 0.000 claims description 2
- 230000008595 infiltration Effects 0.000 claims 1
- 238000001764 infiltration Methods 0.000 claims 1
- 238000011084 recovery Methods 0.000 claims 1
- 238000001223 reverse osmosis Methods 0.000 claims 1
- 238000010276 construction Methods 0.000 abstract description 11
- 239000007788 liquid Substances 0.000 abstract description 4
- 230000000630 rising effect Effects 0.000 abstract description 3
- 239000004575 stone Substances 0.000 description 6
- 229920001903 high density polyethylene Polymers 0.000 description 5
- 239000004700 high-density polyethylene Substances 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000000945 filler Substances 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 230000006870 function Effects 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 206010035148 Plague Diseases 0.000 description 1
- 241000607479 Yersinia pestis Species 0.000 description 1
- 238000009412 basement excavation Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
- B09B1/00—Dumping solid waste
- B09B1/006—Shafts or wells in waste dumps
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/30—Landfill technologies aiming to mitigate methane emissions
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- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Processing Of Solid Wastes (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
The invention relates to a landfill gas horizontal cross well gas collection and reverse drainage filtrate system, which comprises horizontal cross wells, wherein the horizontal cross wells are positioned below a garbage pile body and are arranged at intervals along the height direction of the pile body; the construction method comprises the steps of excavating the gas collecting pipeline, installing and burying the protective sleeve and the horizontal well, the construction is quick and convenient, and the use method can realize the collection of landfill gas or percolate by adjusting the control valve. According to the landfill gas horizontal cross well gas collection and reverse seepage filtrate discharge system and method provided by the technical scheme, the problems that a vertical shaft is easy to deform along with the rising of the height of a pile body and a well head is positioned above the pile body to influence landfill operation in the conventional exhaust and seepage liquid collection method can be effectively solved.
Description
Technical Field
The invention relates to the technical field of landfill gas-liquid treatment, in particular to a landfill gas horizontal cross well gas collection and reverse seepage filtrate discharge system and a landfill gas horizontal cross well gas collection and reverse seepage filtrate discharge method.
Background
The collection of landfill gas and the inverted drainage of leachate in a domestic garbage landfill site are key problems which plague the operation of the landfill site, the timely and efficient collection of the landfill gas and the timely inverted drainage of the leachate relate to the smooth operation of the landfill site and the stability and safety of a landfill pile, and simultaneously provide reliable guarantee for the effective disposal of the leachate.
The invention patent with publication number CN102191166A discloses a landfill gas guide-discharge collection system and a method thereof, wherein a vertical shaft is adopted for gas collection, the vertical shaft is continuously heightened along with the rising of a pile body, a gas collection pipe is easy to deform and bend in the heightening process to influence the gas collection efficiency of an extraction well, and the safety of landfill operation is influenced by excessive landfill gas well heads on the working surface of the landfill pile body. The utility model patent application with the publication number of CN205926568U discloses a horizontal well for collecting landfill gas, and its wellhead is located the heap body top equally and can influences the landfill operation, and simultaneously, the filtration liquid level of the heap internal height can seriously influence gas collection efficiency. Therefore, it is necessary to design a new technical solution to comprehensively solve the problems in the prior art.
Disclosure of Invention
The invention aims to provide a landfill gas horizontal cross well gas collection and reverse-discharge leachate collection system and method, which can effectively solve the problems that a vertical shaft is easy to deform along with the rising of the pile height and a well head is positioned above the pile to influence landfill operation in the conventional gas discharge and leachate collection method.
In order to solve the technical problem, the invention adopts the following technical scheme:
the utility model provides a horizontal cross-well gas collection of landfill gas and inverted drainage ooze filtrating system, is including being located rubbish heap body below, and along the horizontal cross-well of heap body direction of height interval arrangement, horizontal cross-well along horizontal direction interval arrangement, and the well head setting is at the side slope in landfill yard operation area, horizontal cross-well head links to each other with landfill gas collecting pipe and filtration liquid inverted seepage ditch respectively, horizontal cross-well overcoat is equipped with protective sleeve, horizontal cross-well and protective sleeve outer wall all predetermine the aperture.
Further, the horizontal cross well and the protective casing are both provided with hydraulic slopes which are 0.5-1.5% lifted into the pile body from side slopes.
The technical scheme is that the horizontal cross well head is provided with a three-way connecting piece, the upper part of the three-way connecting piece is connected with a landfill gas collecting pipeline through a control valve, the upper end of the three-way connecting piece is provided with a detection port, and the lower end of the three-way connecting piece is connected with a percolate reverse seepage ditch through the control valve.
The further scheme is that the horizontal cross well spacing in the horizontal direction is 15-20 m, and the horizontal cross well spacing in the height direction of the pile body is 9-15 m.
The protection sleeve is a cement pipe, the head end of the cement pipe is located in the pile body, and the tail end of the cement pipe extends to a position 2-3 m away from a side slope of a landfill operation area.
Further, the outer side of the cement pipe is provided with a geotextile material layer.
The construction method for gas collection and reverse drainage of seepage filtrate of the landfill gas horizontal cross well comprises the following steps: after each regional landfill operation is finished, the gas collecting pipeline is excavated, the protective sleeve is sleeved outside the horizontal well, the sleeved horizontal well and the protective sleeve are embedded in the excavated gas collecting pipeline, the well head of the horizontal well is arranged on a side slope of a landfill operation region, then the connection of the end of the horizontal well, the landfill gas collecting pipeline and the percolate reverse seepage ditch is finished, and a detection port is reserved.
The application method of the landfill gas horizontal cross well gas collection and reverse drainage filtrate comprises the following steps:
before the gas collection well begins to extract landfill gas, a landfill gas collection pipeline is conducted, and the connection of a percolate reverse seepage ditch is closed;
regularly observing the detection port, closing the connection of the landfill gas collecting pipeline when the percolate is excessive, conducting the percolate reverse seepage ditch, closing the connection of the percolate reverse seepage ditch after the reverse drainage is finished, and conducting the landfill gas collecting pipeline;
When the landfill gas in a certain layer is not produced any more, the connection of the landfill gas collecting pipeline is closed, and the percolate reverse seepage ditch is communicated.
According to the landfill gas horizontal cross well gas collection and reverse drainage filtrate collection system provided by the technical scheme, after regional landfill operation is completed, a gas collection pipeline is excavated, so that the gas collection system is stable in position and is not easy to deform; in addition, the horizontal cross shaft is sleeved with the protective sleeve, so that fillers such as stones are not required to be filled, the construction is convenient, the prefabricated part is manufactured in a trouble-saving manner, and the construction progress cannot be influenced due to insufficient supply of stones; in addition, the horizontal cross well cannot be damaged by filling materials such as filling stones in the construction process, so that the gas collection efficiency is not influenced; the horizontal cross well provided by the invention has the functions of gas collection and percolate reverse drainage, and the phenomenon of water fullness caused by the increase of a stack body or unsmooth reverse drainage of percolate in a landfill gas collecting pipeline can be avoided, so that the phenomenon of overhigh water level caused by the clogging of a percolate reverse drainage system can be effectively avoided; meanwhile, as the horizontal well is carried out layer by layer in the landfill operation, no landfill gas is generated after the landfill body is aged, the horizontal well can also effectively discharge aged percolate, and can separately collect percolate at different ages, thereby being beneficial to the treatment and disposal of the later percolate. Finally, the horizontal cross well head is arranged on the side slope of the pile body, so that the landfill operation is not influenced, and the problems in the background technology are effectively avoided.
The distance between the end of a cement pipe and the end of a horizontal cross well pipe is 2-3 m, so that landfill gas is sealed; meanwhile, after the landfill site finishes the collection of percolate and biogas, the stale refuse needs to be treated and disposed, and the stale refuse in the area can be pre-aerated through the part, so that the aerobic environment of the pile body is improved, and the odor generated by excavation is reduced.
The construction and use method of the landfill gas horizontal cross well gas collection and reverse seepage filtrate is simple and convenient, and the landfill gas collection pipeline and the leachate reverse seepage ditch can be switched on or off by only opening or closing different control valves, so that the collection of the landfill gas and the leachate is realized.
Drawings
FIG. 1 is a schematic structural diagram of a landfill gas horizontal cross-well gas collection and reverse drainage filtrate system of the present invention.
In the figure: 1. stacking; 2. a horizontal cross well; 3. a cement pipe; 4. a landfill gas collection pipe; 5. a detection port; 6. and (5) pouring the percolate into a seepage ditch.
Detailed Description
In order that the objects and advantages of the invention will be more clearly understood, the following description is given in conjunction with the accompanying examples. It is to be understood that the following text is merely illustrative of one or more specific embodiments of the invention and does not strictly limit the scope of the invention as specifically claimed.
The technical scheme adopted by the invention is as shown in figure 1, the landfill gas horizontal cross well gas collection and reverse-drainage filtrate system comprises horizontal cross wells 2 which are positioned below a garbage dump 1 and are arranged at intervals along the height direction of the dump 1, in the embodiment, the horizontal cross wells 2 are HDPE pipes which are arranged at intervals along the horizontal direction, well heads are arranged on side slopes of a landfill operation area, the well heads of the horizontal cross wells 2 are respectively connected with a landfill gas collection pipeline 4 and a leachate reverse-drainage ditch 6, a cement pipe 3 is sleeved outside the horizontal cross wells 2, the horizontal cross wells 2 and the cement pipe 3 are both provided with 1% of hydraulic gradient from the side slopes to the dump 1, and the horizontal cross wells 2 are provided with a hydraulic gradient of which the ratio is equal to that of the hydraulic gradient of the landfill gas collection pipeline 4 to the leachate reverse-drainage ditch 6And the outer wall of the cement pipe 3 is provided with small holes, in the embodiment, the inner diameter of the cement pipe 3 is 500mm, the size of each hole is 26mm, and the hole distance is 10 cm; the inner diameter of the HDPE pipe is 200mm, the wall thickness of the pipe is 12mm, the size of each eyelet is 32mm, and the hole distance is 20 cm; the head end of the cement pipe 3 is positioned in the pile body 1, and the tail end of the cement pipe extends to a position 2m away from the side slope of the landfill operation area; the outer side of the cement pipe 3 is provided with 200g/m2To improve the firmness of the cement pipe 3.
Referring to fig. 1, a three-way connecting piece is arranged at the head of a horizontal cross shaft 2, the upper part of the three-way connecting piece is connected with a landfill gas collecting pipeline 4 through a control valve, the upper end of the three-way connecting piece is provided with a detection port 5, and the lower end of the three-way connecting piece is connected with a percolate reverse seepage ditch 6 through the control valve.
The construction method for gas collection and reverse drainage of seepage filtrate of the landfill gas horizontal cross well comprises the following steps: the method comprises the steps of excavating a gas collecting pipeline after each layer of regional landfill operation is completed, setting horizontal and vertical distances of horizontal wells to be 15 meters, sleeving cement pipes outside the horizontal wells, embedding the sleeved horizontal wells and the cement pipes in the excavated gas collecting pipeline, arranging well heads of the horizontal wells on side slopes of landfill operation regions, then completing connection of pipe ends of the horizontal wells, landfill gas collecting pipelines and percolate reverse seepage ditches, and reserving detection ports.
The application method of the landfill gas horizontal cross well gas collection and reverse drainage filtrate comprises the following steps:
before the gas collection well begins to extract landfill gas, a landfill gas collection pipeline is conducted, and the connection of a percolate reverse seepage ditch is closed;
regularly observing the detection port, closing the connection of the landfill gas collecting pipeline when the percolate is excessive, conducting the percolate reverse seepage ditch, closing the connection of the percolate reverse seepage ditch after the reverse drainage is finished, and conducting the landfill gas collecting pipeline;
when the landfill gas in a certain layer is not produced any more, the connection of the landfill gas collecting pipeline is closed, and the percolate reverse seepage ditch is conducted.
Namely, when the gas production is large and the level is low, the horizontal well is mainly used for gas collection; when the water level is high and the gas production is large, the valves at the upper end and the lower end are opened simultaneously, and gas collection and drainage are performed simultaneously; when no landfill gas exists in the later period of the landfill, the filtrate is used as reverse seepage filtrate.
In a word, the landfill gas horizontal cross well gas collection and reverse drainage filtrate system and the method thereof excavate the gas collection pipeline after regional landfill operation is finished, and the gas collection system is stable in position and not easy to deform; the cement pipe is sleeved outside the HDPE pipe for the horizontal landfill well, so that fillers such as stones are not required to be filled, the construction is convenient, the raw materials are sufficient, and the construction progress cannot be influenced due to insufficient supply of stones; in addition, the HDPE (high-density polyethylene) pipe cannot be damaged by filling materials such as the filling stone blocks in the construction process, so that the gas collection efficiency is not influenced; the horizontal cross well has the function of draining the percolate, and cannot be scaled and blocked due to soaking of the percolate; the garbage dump leachate of different age groups can be collected independently, which is beneficial to the respective treatment of the subsequent leachate; the horizontal well can be directly used as a percolate reverse drainage system when gas production of the reactor is finished; finally, the well head of the horizontal transverse well is positioned on the side slope of the garbage pile body, and the well head does not influence the landfill operation; the method is particularly suitable for landfills with flat ground and slopes.
The present invention is not limited to the above embodiments, and those skilled in the art can make various equivalent changes and substitutions without departing from the principle of the present invention after learning the content of the present invention, and these equivalent changes and substitutions should be considered as belonging to the protection scope of the present invention.
Claims (6)
1. The utility model provides a horizontal well gas collection of landfill gas and inverted drainage infiltration filtrating system which characterized in that: the landfill gas recovery device comprises horizontal cross wells which are positioned below a garbage heap and are arranged at intervals along the height direction of the garbage heap, wherein the horizontal cross wells are arranged at intervals along the horizontal direction, well heads are arranged on side slopes of a landfill operation area, the well heads of the horizontal cross wells are respectively connected with a landfill gas collection pipeline and a percolate reverse seepage ditch, a protective sleeve is sleeved outside each horizontal cross well, and small holes are respectively formed in the outer walls of the horizontal cross wells and the protective sleeve;
the protective sleeve is a cement pipe, the head end of the cement pipe is located in the pile body, and the tail end of the cement pipe extends to a position 2-3 m away from a side slope of a landfill operation area.
2. The landfill gas horizontal cross-well gas collection and reverse drainage leachate system of claim 1, wherein: the horizontal cross well and the protective casing are both provided with hydraulic slopes which are 0.5-1.5% lifted into the pile body from the side slopes.
3. The landfill gas horizontal cross-well gas collection and reverse drainage leachate system of claim 1, wherein: the horizontal cross well head is provided with a three-way connecting piece, the upper part of the three-way connecting piece is connected with a landfill gas collecting pipeline through a control valve, the upper end of the three-way connecting piece is provided with a detection port, and the lower end of the three-way connecting piece is connected with a percolate reverse seepage ditch through the control valve.
4. The landfill gas horizontal cross-well gas collection and reverse drainage filtrate system of claim 1, wherein: the horizontal cross well spacing in the horizontal direction is 15-20 m, and the horizontal cross well spacing in the height direction of the pile body is 9-15 m.
5. The landfill gas horizontal cross-well gas collection and reverse drainage filtrate system of claim 1, wherein: and a geotextile material layer is arranged on the outer side of the cement pipe.
6. A method of using the landfill gas horizontal cross-well gas collection and reverse osmosis filtrate system of claim 1, comprising the steps of:
excavating a gas collecting pipeline after the regional landfill operation of each layer is finished, sleeving a protective casing outside a horizontal cross well, embedding the sleeved horizontal cross well and the protective casing in the excavated gas collecting pipeline, arranging a well head of the horizontal cross well on a side slope of a landfill operation region, then finishing the connection of the pipe end of the horizontal cross well, the landfill gas collecting pipeline and a percolate reverse seepage ditch, and reserving a detection port;
before the gas collection well begins to extract landfill gas, a landfill gas collection pipeline is conducted, and the connection of a percolate reverse seepage ditch is closed;
regularly observing the detection port, closing the connection of the landfill gas collecting pipeline when the percolate is excessive, conducting the percolate reverse seepage ditch, closing the connection of the percolate reverse seepage ditch after the reverse drainage is finished, and conducting the landfill gas collecting pipeline;
When the landfill gas in a certain layer is not produced any more, the connection of the landfill gas collecting pipeline is closed, and the percolate reverse seepage ditch is communicated.
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| CN114602923B (en) * | 2021-09-10 | 2023-03-28 | 浙江大学 | Sectional type horizontal pumping and injecting system and method for accelerating degradation of refuse landfill |
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