CN-117463743-B - Two-stage biological oxidation gas guide well

CN117463743BCN 117463743 BCN117463743 BCN 117463743BCN-117463743-B

Abstract

The invention belongs to the technical field of environment, and discloses a two-stage biological oxidation gas guide well which comprises a well wall structure, a well pipe structure, a filling structure, a biological covering layer structure and a percolate irrigation structure, wherein the well wall structure comprises a reinforced gabion mesh, the reinforced gabion mesh is arranged in a well hole of a garbage pile body, a first geotechnical filter screen is fixedly arranged on the outer side of the reinforced gabion mesh, and a concrete base is arranged at the bottom of the outer wall of the reinforced gabion mesh. The invention forms a two-stage biological oxidation gas-guide well consisting of the biological filler layer and the biological cover layer structure, the first-stage biological filler layer keeps moisture by utilizing leachate in the pile body, the second-stage biological cover layer keeps moisture by a specially arranged leachate irrigation structure, the purpose of in-situ control of landfill gas is realized, the problem that the landfill gas of a small landfill cannot be treated is solved, the emission of the landfill gas is reduced by two-stage biological oxidation, and the method is suitable for the running landfill, and has the advantages of low cost and easy operation.

Inventors

Hu Ludan
PU HONGXIA
HE SHIYUE
WANG SUJUN
ZENG QINGNAN
ZHANG XUCHEN
ZHANG GENSHENG
WU XIAONAN
WEI XINQING

Assignees

天津建昌环保股份有限公司

Dates

Publication Date: 20260512
Application Date: 20231212

Claims (5)

1. A two-stage biological oxidation gas-guide well is characterized by comprising the following components: A well wall structure, a well tubular structure, a filling structure, a biological coating structure and a percolate irrigation structure; the well wall structure comprises a reinforced gabion mesh (102), wherein the reinforced gabion mesh (102) is arranged in a well hole of a garbage pile body, a first geotechnical filter screen (101) is fixedly arranged on the outer side of the reinforced gabion mesh (102), and a concrete base (103) is arranged at the bottom of the outer wall of the reinforced gabion mesh (102); The well pipe structure is positioned in the well wall structure and comprises a vertical air duct (202), the vertical air duct (202) is arranged in the center of the well wall structure, and end caps (201) are arranged at the upper end and the lower end of the vertical air duct (202); The filling structure comprises a biological filler layer (3), and the biological filler layer (3) is positioned between the well wall structure and the well pipe structure; The biological coating structure is positioned above the well pipe structure and is formed by stacking a coarse grain slag layer (401), a fine grain slag layer (402), a biomass layer (403), a soil layer (404), an HDPE film (405) and a second geotechnical filter screen (406), wherein the overall thickness is not less than 500mm, and the diameter is not less than 2m; The percolate irrigation structure is positioned above the biological coating structure and comprises a percolate irrigation main pipe (502), a percolate irrigation branch pipe (501) is fixedly communicated with the bottom of the percolate irrigation main pipe (502), the bottom of the percolate irrigation branch pipe (501) extends into the biological coating, and valves (503) are arranged on the percolate irrigation branch pipe (501) and the percolate irrigation main pipe (502); The biological coating structure is sequentially provided with a second geotechnical filter screen (406), an HDPE film (405), a coarse grain size slag layer (401), a fine grain size slag layer (402), an HDPE film (405), a biomass layer (403), the second geotechnical filter screen (406), the HDPE film (405) and a soil layer (404) from bottom to top, an air guide channel (407) is reserved when the HDPE film (405) is paved, and the width of the air guide channel (407) at the top is 25-30 cm, and the width of the air guide channel at the middle and the bottom is 15-20 cm; The HDPE film (405) adopts a smooth surface film with the thickness of 1mm, and the specification of the second geotechnical filter screen (406) is not lower than 200g/m <2 >.
2. The two-stage biological oxidation gas-guide well according to claim 1, wherein the vertical gas-guide tube (202) is a pipe with a diameter of 100mm, a solid wall tube is arranged 1m above the vertical gas-guide tube, perforated flower tubes are arranged in the rest of the vertical gas-guide tube, and the opening ratio of the flower tubes is not lower than 3%.
3. The two-stage bio-oxidation gas-guide well according to claim 1, wherein in the bio-coating structure, the coarse grain size slag layer (401) is arranged on the lower layer, the thickness is 100-150 mm, the fine grain size slag layer (402) is arranged on the middle layer, the thickness is 100-150 mm, the biomass layer (403) is arranged on the upper layer, and the thickness is 180-200 mm.
4. The two-stage bio-oxidative gas-guide well as set forth in claim 1, wherein the biomass layer (403) is formed by mixing manure and sawdust, wherein the manure accounts for 40% -50% of the total volume, and the void ratio of the biomass layer (403) is greater than 50%.
5. A two-stage bio-oxidation gas-guide well according to claim 1, wherein the diameter of the percolate irrigation mother pipe (502) is 63mm, the diameter of the percolate irrigation branch pipe (501) is 25mm, and the percolate irrigation branch pipe (501) is in the form of lower perforation and is closed at the tail end by a screw cap.

Description

Two-stage biological oxidation gas guide well Technical Field The invention belongs to the technical field of environment, and particularly relates to a two-stage biological oxidation gas guide well. Background The landfill site can release a large amount of landfill gas in the landfill operation process and within a long period of time after the operation is finished, a large part of landfill gas can be released to the surrounding environment in an unorganized dissipation mode, pollution is caused to the surrounding environment, the main component in the landfill gas is methane, the methane is an important greenhouse gas, the methane is a precursor substance of ozone, the emission of the methane is reduced, the control of the emission of the landfill gas can be started from the aspects that firstly, the reduction of methane is realized by changing the landfill technology in the early stage of landfill process, but the landfill gas can be dissipated into the environment through the cover layer, secondly, the collected landfill gas is collected by using the landfill gas collection system, the emission of the landfill gas such as methane can be reduced by changing the cover layer, the oxidation effect of the landfill gas can be enhanced by changing the cover layer in the landfill process and the landfill site, however, the reduction of the landfill gas can only be realized by changing the cover layer, and the gas can be treated in a gas well, and the improvement of the reduction is needed. Disclosure of Invention The invention aims to provide a two-stage biological oxidation gas guide well to solve the problems in the background technology. In order to achieve the purpose, the invention provides the following technical scheme that the two-stage biological oxidation gas guide well comprises: A well wall structure, a well tubular structure, a filling structure, a biological coating structure and a percolate irrigation structure; the well wall structure comprises a reinforced gabion mesh, the reinforced gabion mesh is arranged in a well hole of the garbage pile body, a first geotechnical filter screen is fixedly arranged on the outer side of the reinforced gabion mesh, and a concrete base is arranged at the bottom of the outer wall of the reinforced gabion mesh; the well pipe structure is positioned in the well wall structure and comprises a vertical air duct, the vertical air duct is arranged in the center of the well wall structure, and end caps are arranged at the upper end and the lower end of the vertical air duct; A biological filler layer is arranged between the well wall structure and the well pipe structure; the biological coating structure is positioned above the well pipe structure and is formed by stacking a coarse grain slag layer, a fine grain slag layer, a biomass layer, a soil layer, an HDPE film and a second geotechnical filter screen, wherein the overall thickness is not less than 500mm, and the diameter is not less than 2m; the infiltration liquid irrigation structure is located biological overburden structure's top, including infiltration liquid irrigation parent tube, the fixed intercommunication in bottom of infiltration liquid irrigation parent tube has the infiltration liquid irrigation branch pipe, the bottom of infiltration liquid irrigation branch pipe extends to in the biological overburden, all be equipped with the valve on infiltration liquid irrigation branch pipe and the infiltration liquid irrigation parent tube. Preferably, the vertical air duct adopts a pipeline with the diameter of 100mm, a solid wall pipe is adopted at the upper part of the pipeline with the diameter of 1m, and perforated flower pipes are adopted at the rest part of the pipeline with the diameter of not less than 3 percent. Preferably, in the biological coating structure, the coarse grain slag layer is positioned on the lower layer, the thickness is 100-150 mm, the fine grain slag layer is positioned on the middle layer, the thickness is 100-150 mm, the biomass layer is positioned on the upper layer, and the thickness is 180-200 mm. Preferably, the biomass layer is formed by mixing manure and sawdust, wherein the manure accounts for 40% -50% of the total volume, and the void ratio of the biomass layer is greater than 50%. Preferably, the stacking sequence of the biological coating structure is from bottom to top sequentially a second geotechnical filter screen, an HDPE film, a coarse grain size slag layer, a fine grain size slag layer, an HDPE film, a biomass layer, a second geotechnical filter screen, an HDPE film and a soil layer, wherein an air guide channel is reserved when the HDPE film is paved, the width of the air guide channel at the top is 25-30 cm, and the width of the air guide channel at the middle and the bottom is 15-20 cm. Preferably, the HDPE film is a 1mm thick smooth film, and the second geotechnical filter specification is not less than 200g/m 2. Preferably, the diameter of the mother pipe