CN117531806A - Landfill gas pumping and injecting process for household garbage landfill - Google Patents

Landfill gas pumping and injecting process for household garbage landfill Download PDF

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Publication number
CN117531806A
CN117531806A CN202311556947.6A CN202311556947A CN117531806A CN 117531806 A CN117531806 A CN 117531806A CN 202311556947 A CN202311556947 A CN 202311556947A CN 117531806 A CN117531806 A CN 117531806A
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China
Prior art keywords
landfill
threshold
landfill gas
sealing door
garbage
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CN202311556947.6A
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Chinese (zh)
Inventor
皮猛
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Beijing Chaoyang Environment Group Co ltd
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Beijing Chaoyang Environment Group Co ltd
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Priority to CN202311556947.6A priority Critical patent/CN117531806A/en
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B09DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
    • B09BDISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
    • B09B1/00Dumping solid waste
    • B09B1/004Covering of dumping sites
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B09DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
    • B09BDISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
    • B09B2101/00Type of solid waste
    • B09B2101/25Non-industrial waste, e.g. household waste

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  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Processing Of Solid Wastes (AREA)

Abstract

A landfill gas pumping and injecting process for a household garbage landfill site comprises the following steps: s1, uniformly burying landfill gas extraction pipelines in the surface layer and the interior of a garbage pile in the garbage landfill process, and burying gas guide and injection pipelines in the surface layer of the garbage pile; s2, starting a negative pressure device of a landfill gas extraction pipeline to extract landfill gas; s3, accumulating local landfill gas caused by uneven fermentation of the garbage stack body, wherein the accumulated landfill gas causes swelling of the covering film; s4, after the covering film bulges, the landfill gas pressure in the covering film is increased, and when the landfill gas pressure reaches a threshold value, a threshold value sealing door is opened; s5, opening a threshold sealing door II, communicating the horizontal part with a landfill gas extraction pipeline, and accelerating the extraction of landfill gas accumulated under the covering film. By improving the gas pumping and injecting device and method of the refuse landfill, the invention improves the efficiency and pertinence of pumping the landfill gas, and ensures that the yield of the landfill gas is stable and is not easy to leak.

Description

Landfill gas pumping and injecting process for household garbage landfill
Technical Field
The invention relates to the technical field of environmental protection, in particular to a landfill gas pumping and injecting process of a household garbage landfill site.
Background
Sanitary landfill of household garbage is a main treatment mode for household garbage treatment, a large amount of landfill gas can be generated by garbage in a landfill site in an anaerobic environment, and the treatment degree of the landfill gas determines the influence degree of the landfill site on the environment. The existing landfill site generally adopts a covering film to cover garbage, and a landfill gas extraction pipeline is arranged in a garbage pile body to intensively collect landfill gas for post-treatment discharge, so that the influence of the landfill gas on the environment can be remarkably reduced. However, the existing landfill gas extraction process is in a uniform extraction mode, an extraction pipeline is arranged in the garbage pile body, the extraction mode is unchanged, and accumulation of the landfill gas in a local area caused by nonuniform fermentation of the garbage pile body is difficult to deal with, so that the covering film bulges and the landfill gas leaks, the environment is influenced, and the extraction stability of the landfill gas is reduced.
Disclosure of Invention
Aiming at the technical problems, the invention aims to provide a landfill gas pumping and injecting process for a household garbage landfill.
A landfill gas pumping and injecting process for a household garbage landfill site comprises the following steps:
s1, uniformly burying a landfill gas extraction pipeline and a gas guide and gas injection pipeline on the surface layer of a garbage pile in the garbage landfill process, wherein the gas guide and gas injection pipeline consists of a horizontal part and a vertical part, the horizontal part is connected with the landfill gas extraction pipeline, the vertical part is connected below the horizontal part and extends to the inside of the garbage pile, a threshold sealing door I is arranged at the joint of the horizontal part and the vertical part and is opened after the air pressure reaches a threshold value, a threshold sealing door II is arranged at the joint of the horizontal part and the landfill gas extraction pipeline and is opened after the air pressure reaches the threshold value, an inwards bent dispersing pipeline is arranged at the tail end of the vertical part and is sealed by a sealing piece, the sealing piece is opened after the threshold sealing door I is opened, a cavity is arranged at the tail end of the dispersing pipeline, the gas injection pipeline is arranged around the cavity in a radiation mode, and compressed air is pre-filled in the vertical part;
s2, starting a negative pressure device of a landfill gas extraction pipeline to extract landfill gas;
s3, accumulating local landfill gas caused by uneven fermentation of the garbage stack body, wherein the accumulated landfill gas causes swelling of the covering film;
s4, after the covering film bulges, the landfill air pressure in the covering film is increased, after the landfill air pressure reaches a threshold value, a threshold sealing door is opened, the threshold sealing door compresses compressed air to a vertical part and seals the joint of the horizontal part and the vertical part, the pre-filled compressed air in the vertical part is extruded downwards, a sealing piece at the tail end of a dispersion pipeline is opened, and the compressed air enters a cavity and is injected into a garbage stack body through an air injection pipeline;
s5, opening a threshold sealing door II, communicating the horizontal part with a landfill gas extraction pipeline, accelerating the extraction of landfill gas accumulated below the covering film, and reducing the fermentation speed of the garbage stack body due to the injected air, so that the generation speed of the landfill gas is reduced.
Further, the pressure threshold of the second threshold sealing door is greater than the pressure threshold of the first threshold sealing door.
Further, a pressure threshold of the first threshold sealing door is set according to a breakage pressure threshold of the cover film.
Further, the horizontal part and the vertical part are square pipelines, the compressed air capacity of the vertical part is 2-6L, and the air pressure of the compressed air is 0.3-0.8MPa.
Further, the first threshold sealing door and the second threshold sealing door control the opening and closing states through a threshold switch, and the threshold switch controls the opening and closing states according to the magnitude of the pressure.
Further, the threshold switch plays a role in controlling opening and closing through the bulges arranged at the first edge and the second edge of the threshold sealing door, and when the pressure reaches the threshold value, the bulges rotate to open the first edge and the second edge of the threshold sealing door.
Further, the first threshold sealing door and the second threshold sealing door are rotated through springs, and the elastic force of the springs is larger than the pressure of compressed air on the first threshold sealing door and the second threshold sealing door.
The invention has the beneficial effects that: by improving the gas pumping and injecting device and method of the refuse landfill, the efficiency and pertinence of pumping the landfill gas are improved, and the yield of the landfill gas is stable and is not easy to leak.
Specifically, in this application, through setting up air guide gas injection pipeline, can realize the atmospheric pressure that leads to local fermentation degree height and increase the problem, can realize carrying out the adjustment of fermentation degree and the increase of bleed flow voluntarily, can save a large amount of manpower and materials costs. For prior art's mode of burying gas injection pipeline, this application has avoided gas injection pipeline and the poor problem of tectorial membrane leakproofness that exogenous air feed pipeline connection led to, moreover, if adopt the mode of exogenous air feed, need the manual check swell condition, adjust the gas injection volume according to artifical experience to if want to accomplish the gas injection to local region, need bury a large amount of pipelines and valves in advance, required cost is higher and difficult control, and the effect is not good.
In addition, in this application, the mode automatic identification tectorial membrane below landfill gas pressure that adopts the linkage to carry out the opening of sealing door according to the threshold value that sets up, communicate horizontal part and landfill gas extraction pipeline when injecting compressed air, increased the quantity of bulge department extraction pipeline promptly, and then improved extraction flow, realized the automatic adjustment extraction state, the cost is lower, and the control degree of difficulty is littleer.
Through continuous experiments in this application, obtained suitable compressed air quantity, when the compressed air pressure chamber of adoption is 0.3-0.8MPa, when the compressed air quantity of per square meter was less than 4L, compressed air quantity was not enough, and the adjustment dynamics to the fermentation degree was not enough, leads to the swell recovery degree not enough, still has the swell to continue broken risk. When the compressed air consumption per square meter is higher than 8L, the garbage fermentation state is pressed for transition, so that the yield of landfill gas is insufficient, and the garbage fermentation speed is influenced.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Fig. 2 is a schematic structural view of the present invention.
Reference numerals:
1. cover film 2, garbage stack 3, horizontal part 4, vertical part 5, threshold sealing door one, threshold sealing door two, threshold sealing door 7, landfill gas extraction pipeline 8, dispersing pipeline 9, sealing element 10, cavity 11, gas injection pipeline 12, protrusion 13, threshold switch 14, pressure sensor 15, spring
Detailed Description
Example 1
A landfill gas pumping and injecting process for a household garbage landfill site comprises the following steps:
s1, as shown in figures 1-2, uniformly burying a landfill gas extraction pipeline 7 in the surface layer of the garbage pile body 2 in the garbage landfill processThe air guide and air injection pipeline consists of a horizontal part 3 and a vertical part 4, and the setting density of the air guide and air injection pipeline is 2/m 2 Two gas-guiding and gas-injecting pipes are oppositely arranged between two adjacent landfill gas extraction pipelines 7, and the opening of the horizontal part 3 is arranged at 1m 2 The side lengths 1/3 and 2/3 of the garbage pile body are that the horizontal part 3 is connected with the landfill gas extraction pipeline 7, the vertical part 4 is connected below the horizontal part 4, the vertical part 4 extends into the garbage pile body 2, a threshold sealing door I5 is arranged at the joint of the horizontal part 3 and the vertical part 4, the threshold sealing door I5 is opened after the air pressure reaches a threshold value and seals the joint of the horizontal part 3 and the vertical part 4, a threshold sealing door II 6 is arranged at the joint of the horizontal part 3 and the landfill gas extraction pipeline 7, the threshold sealing door II 6 is opened after the air pressure reaches the threshold value, the tail end of the vertical part 4 is provided with an inwards bent dispersing pipeline 8, the tail end of the dispersing pipeline 8 is sealed by a sealing piece 9, the sealing piece 9 is opened after the threshold sealing door I5 is opened, the tail end of the dispersing pipeline 8 is provided with a cavity 10, the tail end of the cavity 10 is provided with an air injection pipeline 11 in a radiation way around, and the inside of the vertical part 4 is pre-filled with compressed air; the pressure threshold value of the threshold sealing door II 6 is larger than the pressure threshold value of the threshold sealing door I5; the pressure threshold of the first threshold sealing door 5 is set according to the breakage pressure threshold of the covering film 1, in this embodiment, the pressure threshold of the first threshold sealing door 5 is set to 0.6MPa and the pressure threshold of the second threshold sealing door is set to 0.7MPa according to the breakage limit value of the covering film 1, so that the compressed air can be ensured not to leak into the landfill gas extraction pipeline 7 to cause waste when being injected, the step of adding extraction is slower than the step of injecting compressed air, the compressed air can be ensured to be fully injected into the garbage pile body, and the fermentation reaction is substantially influenced; the horizontal part 3 and the vertical part 4 are square pipelines, the compressed air capacity of the vertical part 4 is 3L (if the number of the air guide and injection pipelines is halved to 1/m 2 The compressed air capacity may correspond to 6L), the air pressure of the compressed air is 0.5MPa; the first and second threshold sealing doors 5 and 6 are controlled to be opened and closed by a threshold switch 13, the threshold switch 13 controls the switch state according to the pressure, the embodiment adopts a pressure sensor 14 to sense the pressure of landfill gas, or adopts a pressure switch, when the pressure below the covering film 1 is greater than the pressure of compressed air, the threshold switch 13 automatically seals the airOpening the sealing door; as shown in fig. 2, the threshold switch 13 plays a role in controlling opening and closing through the protrusions 12 arranged at the edges of the first threshold sealing door 5 and the second threshold sealing door 6, when the pressure reaches the threshold value, the protrusions 12 rotate to open the first threshold sealing door 5 and the second threshold sealing door 6, the first threshold sealing door 5 and the second threshold sealing door 6 rotate through the spring 15, and the elastic force of the spring 15 is larger than the pressure of compressed air on the first threshold sealing door 5 and the second threshold sealing door 6;
s2, starting a negative pressure device of the landfill gas extraction pipeline 7 to extract landfill gas;
s3, local landfill gas is accumulated due to uneven fermentation of the garbage stack body 2, and the accumulated landfill gas causes swelling of the covering film 1;
s4, after the covering film 1 bulges, the landfill air pressure in the covering film 1 is increased, after the landfill air pressure reaches a threshold value, a first threshold sealing door 5 is opened, the first threshold sealing door 5 compresses compressed air to the vertical part 4 and seals the joint of the horizontal part 3 and the vertical part 4, the pre-filled compressed air in the vertical part 4 is extruded downwards, a sealing piece 9 at the tail end of a dispersion pipeline 8 is opened, and the compressed air enters a cavity 10 and is injected into the garbage stack 2 through an air injection pipeline 11;
s5, opening a threshold sealing door II 6, communicating the horizontal part 3 with a landfill gas extraction pipeline 7, accelerating the extraction of landfill gas accumulated below the covering film 1, weakening the fermentation speed of the garbage stack body 2 due to the injected air, and reducing the generation speed of the landfill gas.
After 1 month of implementation of the embodiment, the swelling condition of the covering film 1 is obviously improved, when fermentation is carried out for 15 days, swelling occurs in a part of the covering film 1, the swelling height is 5cm, then the air pressure below the covering film 1 reaches a threshold value, the first threshold sealing door 5 and the second threshold sealing door 6 are opened, compressed air is injected into the garbage stack body 2, the extraction flow of landfill gas for the swelling area is increased through the horizontal part, then the swelling height is reduced, and after 3 days, the swelling height is less than 1cm.
Comparative example 1
The comparative example differs from the example in that: only setting up landfill gas extraction pipeline 7, carrying out landfill gas extraction by adopting conventional extraction mode, after implementing 1 month, the cover membrane 1 swell condition is serious, and when fermenting for 15 days, many swell heights reach 5cm, and after increasing whole extraction flow for 3 days, the swell height descends to 4cm, but because can't pertinently adjust the degree of fermentation, the swell height continues to increase afterwards, and when fermenting for 28 days, the swell begins to take place the damage, and landfill gas leaks, leads to landfill gas output unstable, and the landfill gas of leakage causes the concentration of malodorous gas sulfur dioxide and ammonia in the surrounding environment to double.
Comparative example 2
The comparative example is different from example 1 in that the preset amount of compressed air per square meter is 3L and the final bulge height is 3cm. Therefore, when the consumption of the compressed air is insufficient, the adjustment force for the fermentation degree of the garbage stack body 2 is insufficient.
Comparative example 3
This comparative example differs from example 1 in that: the preset amount of compressed air per square meter is 8L, and the final bulge height is lower than 1cm. But the landfill gas yield was 85% of example 1. Therefore, when the consumption of the compressed air is too high, the fermentation of the garbage pile body 2 is affected, and the gas yield of landfill gas is insufficient.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention. Furthermore, features defining "first", "second" may include one or more such features, either explicitly or implicitly. In the description of the present invention, unless otherwise indicated, the meaning of "a plurality" is two or more.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art. In the description of the present invention, a description of the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention.
In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the invention, the scope of which is defined by the claims and their equivalents.

Claims (7)

1. The landfill gas pumping and injecting process for the household garbage landfill site is characterized by comprising the following steps of: s1, uniformly burying a landfill gas extraction pipeline and a gas guide and gas injection pipeline on the surface layer of a garbage pile in the garbage landfill process, wherein the gas guide and gas injection pipeline consists of a horizontal part and a vertical part, the horizontal part is connected with the landfill gas extraction pipeline, the vertical part is connected below the horizontal part and extends to the inside of the garbage pile, a threshold sealing door I is arranged at the joint of the horizontal part and the vertical part and is opened after the air pressure reaches a threshold value, a threshold sealing door II is arranged at the joint of the horizontal part and the landfill gas extraction pipeline and is opened after the air pressure reaches the threshold value, an inwards bent dispersing pipeline is arranged at the tail end of the vertical part and is sealed by a sealing piece, the sealing piece is opened after the threshold sealing door I is opened, a cavity is arranged at the tail end of the dispersing pipeline, the gas injection pipeline is arranged around the cavity in a radiation mode, and compressed air is pre-filled in the vertical part;
s2, starting a negative pressure device of a landfill gas extraction pipeline to extract landfill gas;
s3, accumulating local landfill gas caused by uneven fermentation of the garbage stack body, wherein the accumulated landfill gas causes swelling of the covering film;
s4, after the covering film bulges, the landfill air pressure in the covering film is increased, after the landfill air pressure reaches a threshold value, a threshold sealing door is opened, the threshold sealing door compresses compressed air to a vertical part and seals the joint of the horizontal part and the vertical part, the pre-filled compressed air in the vertical part is extruded downwards, a sealing piece at the tail end of a dispersion pipeline is opened, and the compressed air enters a cavity and is injected into a garbage stack body through an air injection pipeline;
s5, opening a threshold sealing door II, communicating the horizontal part with a landfill gas extraction pipeline, accelerating the extraction of landfill gas accumulated below the covering film, and reducing the fermentation speed of the garbage stack body due to the injected air, so that the generation speed of the landfill gas is reduced.
2. The landfill gas pumping and injecting process according to claim 1, wherein the pressure threshold of the second threshold sealing door is greater than the pressure threshold of the first threshold sealing door.
3. The landfill gas pumping and injecting process according to claim 1, wherein the pressure threshold of the first threshold sealing door is set according to the breakage pressure threshold of the covering film.
4. The process for pumping and injecting landfill gas in a household garbage landfill according to claim 1, wherein the horizontal part and the vertical part are square pipelines, the compressed air capacity of the vertical part is 2-6L, and the air pressure of the compressed air is 0.3-0.8MPa.
5. The landfill gas pumping and injecting process for the household garbage landfill according to claim 1, wherein the first threshold sealing door and the second threshold sealing door are controlled to be opened and closed by a threshold switch, and the threshold switch is controlled to be opened and closed according to the magnitude of the pressure.
6. The landfill gas pumping and injecting process for the household garbage landfill according to claim 1, wherein the threshold switch plays a role in controlling opening and closing through the protrusions arranged at the first edge and the second edge of the threshold sealing door, and when the pressure reaches the threshold value, the protrusions rotate to open the first edge and the second edge of the threshold sealing door.
7. The landfill gas pumping and injecting process for the household garbage landfill according to claim 1, wherein the first threshold sealing door and the second threshold sealing door are rotated by springs, and the elasticity of the springs is larger than the pressure of the compressed air to the first threshold sealing door and the second threshold sealing door.
CN202311556947.6A 2023-11-21 2023-11-21 Landfill gas pumping and injecting process for household garbage landfill Pending CN117531806A (en)

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CN202311556947.6A CN117531806A (en) 2023-11-21 2023-11-21 Landfill gas pumping and injecting process for household garbage landfill

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Application Number Priority Date Filing Date Title
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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20020067953A1 (en) * 2000-09-05 2002-06-06 Ankeny Mark D. Design, monitoring and control of soil carburetors for degradation of volatile compounds
US20180154408A1 (en) * 2016-12-05 2018-06-07 Peking University, Shenzhen Graduate School Dynamic two-way guide and drainage control method for leachate and landfill gas
US20200101505A1 (en) * 2018-10-01 2020-04-02 Loci Controls, Inc. Landfill gas extraction systems and methods
CN113587102A (en) * 2021-08-24 2021-11-02 河南百川畅银环保能源股份有限公司 Automatic adjusting system and method for landfill gas pressure and methane concentration
WO2022238952A1 (en) * 2021-05-12 2022-11-17 Exe - Engineering For Environment S.R.L. Landfill biogas extraction plant with remote management and control

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20020067953A1 (en) * 2000-09-05 2002-06-06 Ankeny Mark D. Design, monitoring and control of soil carburetors for degradation of volatile compounds
US20180154408A1 (en) * 2016-12-05 2018-06-07 Peking University, Shenzhen Graduate School Dynamic two-way guide and drainage control method for leachate and landfill gas
US20200101505A1 (en) * 2018-10-01 2020-04-02 Loci Controls, Inc. Landfill gas extraction systems and methods
WO2022238952A1 (en) * 2021-05-12 2022-11-17 Exe - Engineering For Environment S.R.L. Landfill biogas extraction plant with remote management and control
CN113587102A (en) * 2021-08-24 2021-11-02 河南百川畅银环保能源股份有限公司 Automatic adjusting system and method for landfill gas pressure and methane concentration

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