CN110655188B - Domestic garbage leachate and landfill gas cooperative treatment device and method thereof - Google Patents

Domestic garbage leachate and landfill gas cooperative treatment device and method thereof Download PDF

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CN110655188B
CN110655188B CN201910963137.XA CN201910963137A CN110655188B CN 110655188 B CN110655188 B CN 110655188B CN 201910963137 A CN201910963137 A CN 201910963137A CN 110655188 B CN110655188 B CN 110655188B
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reaction zone
percolate
landfill gas
garbage
leachate
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CN110655188A (en
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卢培利
郭俊良
崔颖
凌传翔
王学文
洪蓉蓉
黄睿思
丁阿强
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Chongqing University
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    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/30—Aerobic and anaerobic processes
    • C02F3/302—Nitrification and denitrification treatment
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/46—Removing components of defined structure
    • B01D53/72—Organic compounds not provided for in groups B01D53/48 - B01D53/70, e.g. hydrocarbons
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/84—Biological processes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2251/00—Reactants
    • B01D2251/95—Specific microorganisms
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2256/00—Main component in the product gas stream after treatment
    • B01D2256/10—Nitrogen
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2256/00—Main component in the product gas stream after treatment
    • B01D2256/22—Carbon dioxide
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2257/00—Components to be removed
    • B01D2257/70—Organic compounds not provided for in groups B01D2257/00 - B01D2257/602
    • B01D2257/702—Hydrocarbons
    • B01D2257/7022—Aliphatic hydrocarbons
    • B01D2257/7025—Methane
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00—Nature of the contaminant
    • C02F2101/10—Inorganic compounds
    • C02F2101/16—Nitrogen compounds, e.g. ammonia
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
    • C02F2103/06—Contaminated groundwater or leachate
    • 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
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
    • 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
    • Y02C—CAPTURE, STORAGE, SEQUESTRATION OR DISPOSAL OF GREENHOUSE GASES [GHG]
    • Y02C20/00—Capture or disposal of greenhouse gases
    • Y02C20/20—Capture or disposal of greenhouse gases of methane
    • 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
    • Y02W10/00—Technologies for wastewater treatment
    • Y02W10/10—Biological treatment of water, waste water, or sewage

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  • Environmental & Geological Engineering (AREA)
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  • Biomedical Technology (AREA)
  • Health & Medical Sciences (AREA)
  • General Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Water Supply & Treatment (AREA)
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  • Microbiology (AREA)
  • Biodiversity & Conservation Biology (AREA)
  • Molecular Biology (AREA)
  • Separation Using Semi-Permeable Membranes (AREA)
  • Treatment Of Sludge (AREA)
  • Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)

Abstract

The invention discloses a domestic garbage leachate and landfill gas cooperative treatment device and a method thereof. The device is of concentric cylindrical configuration, divided into three regions. The top of the anaerobic reaction zone is provided with a water distributor, the bottom of the anaerobic reaction zone is stockpiled with the domestic garbage to be treated, and the mineralized garbage is used as a cover layer on the domestic garbage to be treated; the aerobic reaction zone is internally provided with a transmitter, the outlet of the transmitter is connected with a vacuum pump and a submersible pump, and the other end of the submersible pump is connected with a water distributor in the anaerobic reaction zone. When the device is used, leachate generated by garbage accumulated in the anaerobic reaction area is firstly pumped to the aerobic reaction area, is re-sprayed into the anaerobic reaction area through the conveyor after being reacted by nitrifying microorganisms, and reacts with methane generated by fresh garbage under the action of nitrate type anaerobic methane oxidation microorganisms in the cover layer to remove pollutants. The invention realizes the cooperative removal of leachate and landfill gas generated by fresh garbage by the circulating device and nitrate type anaerobic methane oxidation microorganisms, and has the characteristics of low cost, low energy consumption and small space.

Description

Domestic garbage leachate and landfill gas cooperative treatment device and method thereof
Technical Field
The invention belongs to the field of biological treatment of waste water and waste gas, and particularly relates to a domestic garbage leachate and landfill gas cooperative treatment device.
Background
Although the cost is low, methane continuously generated in the landfill process is easy to release into the atmosphere to cause atmospheric pollution and aggravate greenhouse effect, and generated leachate contains high ammonia nitrogen, and if the leachate is directly discharged into the environment without treatment, a series of environmental problems such as eutrophication and the like can be caused. At present, the high ammonia nitrogen leachate is treated in a mode of heterotopic nitrification and denitrification commonly adopted by a refuse landfill, and most of generated methane is not further collected and utilized, so that the environmental risk is increased, and the waste of resources and energy is caused.
Disclosure of Invention
The invention provides a novel landfill leachate and landfill gas cooperative treatment device, aiming at the problems of disordered discharge of landfill gas with random mode application value, high ammonia nitrogen of leachate and the like generated in the landfill process of the existing landfill.
The technical scheme adopted by the invention is as follows:
a novel domestic garbage leachate and landfill gas cooperative treatment device is characterized in that the device is formed by sequentially nesting an anaerobic reaction area, an aerobic reaction area and a constant-temperature water bath area layer by layer from inside to outside to form a concentric cylinder; the top of the anaerobic reaction zone is provided with a water distributor, the bottom of the inner cavity of the anaerobic reaction zone is paved with fresh garbage as a buried layer, the buried layer is paved with mineralized garbage as a cover layer, and nitrate type anaerobic methane oxidation microorganisms are enriched in the cover layer; a plurality of gas-guide tubes penetrating through the filling layer and the cover layer are arranged in the anaerobic reaction zone, so that methane generated by the filling layer can be uniformly guided into the cover layer; a percolate collecting device for collecting percolate is arranged below the anaerobic reaction zone, and a water outlet of the percolate collecting device is connected with the lower end of the aerobic reaction zone through a water conveying pump; the aerobic reaction zone is inoculated with nitrifying microorganisms, the bottom of the aerobic reaction zone is provided with an aeration head, the top of the aerobic reaction zone is provided with a horn-shaped conveyor with a thin lower part and a thick upper part, the bottom opening of the conveyor is communicated with the inner cavity of the aerobic reaction zone, and the top of the conveyor is annularly and fixedly sealed with the side wall of the aerobic reaction zone; the inner cavity of the conveyor is connected with a vacuum pump, and the vacuum pump is used for controlling the inner cavity of the conveyor to form negative pressure degassing; a submersible pump is arranged in the inner cavity of the conveyor, and the leachate in the conveyor is sprayed onto the cover layer again through the submersible pump and a water distributor in the anaerobic reaction zone; the constant-temperature water bath area is used for adjusting the internal temperature of the treatment device.
Preferably, in the anaerobic reaction zone, the bottom of the landfill layer is separated from the top of the percolate collecting device through a filter membrane, so that percolate generated by the landfill layer enters the percolate collecting device to be gathered, and solid particles falling from the landfill layer and the cover layer are blocked.
Preferably, the pore size of the filter membrane is 120 microns.
Preferably, the water distributor at the top of the anaerobic reaction zone is a disc distributor.
Preferably, the cross-sectional area ratio of the bottom end to the top end of the conveyor is 1: 10.
Preferably, a dissolved oxygen sensor is arranged in the cover layer and used for monitoring the oxygen concentration in the anaerobic reaction zone in real time.
Preferably, a temperature control device is arranged in the constant-temperature water bath area and used for sensing, displaying and adjusting the temperature in the device.
Preferably, the water delivery pump adopts a peristaltic pump.
Preferably, the conveyor is provided in plurality in the aerobic reaction zone.
Another objective of the present invention is to provide a method for treating domestic garbage leachate and landfill gas in a synergistic manner, which comprises the following steps:
firstly, filling fresh garbage into an anaerobic reaction area to form a filling layer, and covering mineralized garbage enriched with nitrate type anaerobic methane oxidation microorganisms on the filling layer to form a cover layer; the fresh garbage is gradually decomposed to generate leachate and landfill gas, wherein the landfill gas diffuses to the upper cover layer, and the leachate permeates downwards;
then, the percolate is collected at a percolate collecting device through a filter membrane and is pumped into an aerobic reaction zone through a water delivery pump;
then, maintaining the aerobic environment of leachate in the aerobic reaction zone through the aeration of the aeration head, converting ammonia nitrogen into nitrate or nitrite in the aerobic reaction zone through the action of nitrifying microorganisms, enabling the leachate after aerobic treatment to enter a gradually-expanded ascending channel through the bottom of a conveyor, and removing oxygen in the leachate by releasing dissolved gas generated by gradually-expanded flow and matching with the negative pressure suction action of a vacuum pump;
and finally, the leachate is pumped into a water distributor of the anaerobic reaction area by a submersible pump and then is uniformly sprayed, the mineralized garbage on the cover layer is contacted with landfill gas generated by fresh garbage, and nitrate and methane are synchronously converted into carbon dioxide and nitrogen under the action of nitrate type anaerobic methane oxidation microorganisms, so that the synergistic removal of pollutants in the leachate and the landfill gas is realized.
The invention has the beneficial effects that:
the invention takes a novel nitrate type anaerobic methane oxidation biological denitrification technology as a core, and constructs a novel domestic garbage leachate and landfill gas cooperative treatment device by utilizing the characteristic that the nitrate and methane can be cooperatively treated. Through the alternative aerobic/anaerobic hydraulic design, ammonia nitrogen in the leachate can be converted into nitrate under the aerobic condition and then can still flow back to the anaerobic reaction zone, and the nitrate and methane generated by the household garbage are converted into nitrogen and carbon dioxide under the action of nitrate type anaerobic methane oxidation microorganisms of the cover layer, so that the efficient synergistic treatment effect of the landfill gas and the leachate is realized.
Drawings
FIG. 1 is a schematic view of a novel landfill leachate and landfill gas co-processing device;
FIG. 2 is a top view of the processing apparatus;
in the figure: the device comprises a water distributor 1, an anaerobic reaction zone 2, an air duct 3, a rapid filter membrane 4, a percolate collecting device 5, a water delivery pump 6, an aerobic reaction zone 7, an aeration head 8, a transmitter 9, a vacuum pump 10, a submersible pump 11, a constant temperature water bath zone 12, a temperature control device 13, a filling layer 14, a cover layer 15 and a dissolved oxygen inductor 16.
Detailed Description
The invention is further illustrated with reference to the figures and examples.
As shown in figures 1 and 2, the novel domestic garbage leachate and landfill gas cooperative treatment device designed for the invention is formed by sequentially nesting an anaerobic reaction zone 2, an aerobic reaction zone 7 and a constant-temperature water bath zone 12 layer by layer from inside to outside to form a concentric cylinder. The three areas are in a concentric cylinder structure but are not directly communicated, and only the anaerobic reaction area 2 and the aerobic reaction area 7 are indirectly communicated through a flow path. The invention simultaneously arranges an anaerobic reaction zone 2 and an aerobic reaction zone 7 which are connected in a reaction device, and hydraulic circulation is carried out between the two zones through a circulating device. According to the invention, through process optimization, leachate and landfill gas generated in the garbage treatment process can be cooperatively treated by nitrifying microorganisms and nitrate type anaerobic methane oxidation microorganisms. The specific implementation of each structure is described in detail below:
the anaerobic reaction zone 2 is positioned in the center of the whole device and is in a hollow column shape, the top of the anaerobic reaction zone is provided with a water distributor 1, and the water distributor 1 is a disc distributor in the embodiment, so that the water distribution is more uniform. Fresh garbage is paved at the bottom of the inner cavity of the anaerobic reaction area 2 to be used as a filling layer 14, mineralized garbage is paved on the filling layer 14 to be used as a cover layer 15, and nitrate type anaerobic methane oxidation microorganisms are enriched in the mineralized garbage of the cover layer 15, so that the subsequent water-gas cooperative treatment is facilitated. The specific thicknesses of the buried layer 14 and the cap layer 15 may be adjusted as desired. Because a large amount of percolate is generated in the process of decomposing the garbage, the garbage layer body is compact, and the gas can not rise smoothly, a plurality of gas guide pipes 3 penetrating through the filling layer 14 and the cover layer 15 are arranged in the anaerobic reaction area 2, so that the methane generated by the filling layer 14 can be uniformly guided into the cover layer 15. Leachate generated in the process of decomposing the garbage is deposited to the bottom of the anaerobic reaction zone 2 under the action of gravity, so a leachate collecting device 5 for collecting the leachate is required to be arranged below the anaerobic reaction zone 2. In this embodiment, the percolate collecting device 5 is an inverted funnel-shaped container, the top opening of the container is equal in diameter to the bottom of the anaerobic reaction zone 2, and the bottom of the container is provided with a water outlet. Since the garbage of the buried layer 14 and the cover layer 15 can generate a large amount of solid garbage particles, a transverse rapid filter membrane 4 is required to be arranged between the bottom of the buried layer 14 and the water inlet at the top of the percolate collecting device 5, and percolate generated by the buried layer 14 can rapidly enter the percolate collecting device 5 to be collected through the separation of the filter membranes 4, and simultaneously, the solid particles falling from the buried layer 14 and the cover layer 15 are blocked. The pore size of the filter membrane 4 may be set to 120 μm in consideration of the particle size of general garbage particles.
The bottom water outlet of the percolate collecting device 5 is connected with the lower end of the aerobic reaction zone 7 through a water delivery pump 6 and is used for pumping percolate into the aerobic reaction zone 7. The water delivery pump 6 can adopt a peristaltic pump. The aerobic reaction zone 7 is used for nitrifying the percolate and converting a large amount of ammonia nitrogen contained in the percolate into nitrate nitrogen, so that nitrifying microorganisms need to be inoculated in the zone. The bottom of the aerobic reaction zone 7 is provided with an aeration head 8 connected with an external fan, which is used for aerating the percolate and maintaining an aerobic environment. The top of the aerobic reaction zone 7 is provided with a conveyor 9 with a thin lower part and a thick upper part, in the embodiment, 2 conveyors 9 are arranged in the aerobic reaction zone 7, each conveyor 9 is in a horn shape, the bottom of each conveyor is provided with a straight pipe section, the upper part of each conveyor is a gradually expanding section, and the cross section area ratio of the bottom end to the top end of each gradually expanding section is 1: 10. The bottom opening of the conveyor 9 is communicated with the inner cavity of the aerobic reaction zone 7, and the top ring is hermetically fixed with the side wall of the aerobic reaction zone 7. During the operation, as the percolate in the aerobic reaction zone 7 is continuously pumped in, the liquid level thereof gradually rises until the bottom opening position of the conveyor 9 is reached. As the percolate continues to be pumped in, it enters from the bottom opening of the conveyor 9, and because the ascending flow channel is divergent, a fluid flow surface is formed, during which dissolution of dissolved gases in the percolate occurs. The inner cavity of the conveyor 9 is connected with a vacuum pump 10 through a pipeline, and the vacuum pump 10 performs vacuum pumping on the inner cavity of the conveyor 9, so that the percolate is degassed by negative pressure, and most of dissolved oxygen in the percolate is removed. The inner cavity of the conveyor 9 is provided with a submersible pump 11, the deoxidized percolate can be pumped into the water distributor 1 in the anaerobic reaction zone 2 through the submersible pump 11, and then the percolate in the conveyor 9 is sprayed onto the cover layer 15 again through the water distributor 1. The thermostatic water bath 12 may be used to regulate the temperature inside the treatment apparatus throughout the process, keeping it at an optimum temperature.
In addition, in order to monitor the reaction parameters conveniently, a dissolved oxygen sensor 16 is arranged in the cover layer 15 and used for monitoring the oxygen concentration in the anaerobic reaction zone in real time. Meanwhile, a temperature control device 13 is arranged in the constant-temperature water bath area 12 and used for sensing and displaying the temperature of the device, automatically adjusting the temperature to be suitable for reaction to occur, and ensuring the activity and the reaction rate of microorganisms.
In the invention, nitrate type anaerobic methane oxidation microorganisms are taken as a core, and the microorganisms can cooperatively treat methane and nitrate, so that ammonia nitrogen in percolate can be converted into nitrate under an aerobic condition and then can still flow back to an anaerobic reaction zone through process optimization, and the nitrate type anaerobic methane oxidation microorganisms and methane generated by domestic garbage are converted into nitrogen and carbon dioxide under the action of the nitrate type anaerobic methane oxidation microorganisms of the cover layer, thereby realizing the efficient cooperative treatment effect of landfill gas and percolate.
Therefore, based on the treatment device, the invention provides a domestic garbage leachate and landfill gas cooperative treatment method, which comprises the following specific steps:
firstly, fresh garbage, that is, garbage which has not been decomposed is filled into the anaerobic reaction zone 2 to form a buried layer 14, and a mineralized garbage enriched with nitrate type anaerobic methane-oxidizing microorganisms is covered thereon to form a cover layer 15. As the decomposition proceeds, the fresh waste gradually decomposes itself to produce leachate and landfill gas, which diffuses towards the upper cover 15 and leachate permeates downwards.
The percolate is then filtered through a filter membrane 4 and collected in a percolate collection device 5 and pumped by a water pump 6 into an aerobic reaction zone 7.
Then, the aerobic environment of the percolate in the aerobic reaction zone 7 is maintained through the aeration of the aeration head 8, the ammonia nitrogen of the percolate is converted into nitrate or nitrite in the aerobic reaction zone 7 through the action of nitrifying microorganisms, the percolate subjected to aerobic treatment enters a gradually-expanded ascending channel through the bottom of the conveyor 9, and dissolved gas generated by gradually-expanded flow is released and simultaneously matched with the negative pressure suction action of the vacuum pump 10 to remove oxygen in the percolate.
Finally, the leachate is pumped into the water distributor 1 of the anaerobic reaction zone 2 by the submersible pump 11 and then is uniformly sprayed, the mineralized garbage of the cover layer 15 is contacted with the landfill gas generated by fresh garbage, and nitrate and methane are synchronously converted into carbon dioxide and nitrogen under the action of nitrate type anaerobic methane oxidation microorganisms, so that the synergistic removal of pollutants in the leachate and the landfill gas is realized.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made in accordance with the principles of the present invention are intended to be included within the scope of the present invention.

Claims (10)

1. A domestic garbage leachate and landfill gas cooperative treatment device is characterized in that the device is formed by sequentially nesting an anaerobic reaction zone (2), an aerobic reaction zone (7) and a constant-temperature water bath zone (12) layer by layer from inside to outside to form a concentric cylinder; the top of the anaerobic reaction zone (2) is provided with a water distributor (1), the bottom of the inner cavity of the anaerobic reaction zone (2) is paved with fresh garbage as a filling layer (14), the upper part of the filling layer (14) is paved with mineralized garbage as a cover layer (15), and the cover layer (15) is enriched with nitrate type anaerobic methane oxidation microorganisms; a plurality of gas-guide tubes (3) penetrating through the filling layer (14) and the cover layer (15) are arranged in the anaerobic reaction zone (2), so that methane generated by the filling layer (14) can be uniformly guided into the cover layer (15); a percolate collecting device (5) for collecting percolate is arranged below the anaerobic reaction zone (2), and a water outlet of the percolate collecting device (5) is connected with the lower end of the aerobic reaction zone (7) through a water conveying pump (6); nitrifying microorganisms are inoculated in the aerobic reaction zone (7), an aeration head (8) is arranged at the bottom of the aerobic reaction zone, a horn-shaped conveyor (9) with a thin lower part and a thick upper part is arranged at the top of the aerobic reaction zone, an opening at the bottom of the conveyor (9) is communicated with an inner cavity of the aerobic reaction zone (7), and the top of the conveyor is annularly and fixedly sealed with the side wall of the aerobic reaction zone (7); the inner cavity of the conveyor (9) is connected with a vacuum pump (10), and the vacuum pump (10) controls the inner cavity of the conveyor (9) to form negative pressure degassing; a submersible pump (11) is arranged in the inner cavity of the conveyor (9), and the percolate in the conveyor (9) is sprayed onto the cover layer (15) again through the submersible pump (11) and the water distributor (1) in the anaerobic reaction area (2); the constant-temperature water bath area (12) is used for adjusting the internal temperature of the treatment device.
2. The device for the cooperative treatment of the domestic garbage percolate and the landfill gas according to the claim 1, is characterized in that: in the anaerobic reaction zone (2), the bottom of the filling layer (14) is separated from the top of the percolate collecting device (5) by a filter membrane (4), so that percolate generated by the filling layer (14) enters the percolate collecting device (5) to be gathered, and solid particles falling from the filling layer (14) and the cover layer (15) are blocked.
3. The device for the cooperative treatment of the domestic garbage percolate and the landfill gas according to the claim 2, is characterized in that: the pore size of the filter membrane (4) is 120 microns.
4. The device for the cooperative treatment of the domestic garbage percolate and the landfill gas according to the claim 1, is characterized in that: the water distributor (1) at the top of the anaerobic reaction zone (2) is a disc distributor.
5. The device for the cooperative treatment of the domestic garbage percolate and the landfill gas according to the claim 1, is characterized in that: the cross-sectional area ratio of the bottom end to the top end of the conveyor (9) is 1: 10.
6. The device for the cooperative treatment of the domestic garbage percolate and the landfill gas according to the claim 1, is characterized in that: and a dissolved oxygen sensor (16) is arranged in the cover layer (15) and is used for monitoring the oxygen concentration in the anaerobic reaction zone in real time.
7. The device for the cooperative treatment of the domestic garbage percolate and the landfill gas according to the claim 1, is characterized in that: and a temperature control device (13) is arranged in the constant-temperature water bath area (12) and is used for sensing, displaying and adjusting the temperature in the device.
8. The device for the cooperative treatment of the domestic garbage percolate and the landfill gas according to the claim 1, is characterized in that: the water delivery pump (6) adopts a peristaltic pump.
9. The device for the cooperative treatment of the domestic garbage percolate and the landfill gas according to the claim 1, is characterized in that: the conveyor (9) is provided in plurality in the aerobic reaction zone (7).
10. A method for cooperatively treating domestic garbage percolate and landfill gas by using the treatment device of claim 1 is characterized by comprising the following specific steps of:
firstly, fresh garbage is filled into an anaerobic reaction zone (2) to form a filling layer (14), and mineralized garbage enriched with nitrate type anaerobic methane oxidation microorganisms is covered on the filling layer to form a cover layer (15); the fresh garbage is gradually decomposed to generate leachate and landfill gas, wherein the landfill gas diffuses to the upper cover layer (15), and the leachate permeates downwards;
then, the percolate is collected at a percolate collecting device (5) through a filter membrane (4) and then is pumped into an aerobic reaction zone (7) through a water delivery pump (6);
then, maintaining the aerobic environment of leachate in the aerobic reaction zone (7) through the aeration of the aeration head (8), converting ammonia nitrogen into nitrate or nitrite in the aerobic reaction zone (7) through the action of nitrifying microorganisms, enabling the leachate after aerobic treatment to enter a gradually-expanded ascending channel through the bottom of a conveyor (9), and removing oxygen in the leachate by releasing dissolved gas generated by gradually-expanded flow and matching with the negative pressure suction action of a vacuum pump (10);
and finally, the leachate is pumped into a water distributor (1) of an anaerobic reaction zone (2) by a submersible pump (11), and is uniformly sprayed, the mineralized garbage of the cover layer (15) is contacted with landfill gas generated by fresh garbage, and nitrate and methane are synchronously converted into carbon dioxide and nitrogen under the action of nitrate type anaerobic methane oxidation microorganisms, so that the synergistic removal of pollutants in the leachate and the landfill gas is realized.
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CN112194312B (en) * 2020-08-31 2022-05-31 山东大学 Enhanced denitrification system and method for landfill leachate
CN114904896B (en) * 2022-05-30 2024-02-20 陕西佳芳生物科技有限公司 Energy-saving and environment-friendly biodegradable garbage treatment method
CN115490404B (en) * 2022-11-17 2023-05-19 利华益维远化学股份有限公司 Sewage plant wastewater and waste gas treatment system and treatment method

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CN2688698Y (en) * 2004-04-16 2005-03-30 周天元 Purifier for trip biological degradation sludge gas fermentation and living industrial sewage
CN101412033A (en) * 2008-12-01 2009-04-22 浙江大学 Method and system for preparing rubbish biological mulching soil material of landfill yard methane emission reduction
CA2927328C (en) * 2013-10-23 2017-09-12 Centre De Recherche Industrielle Du Quebec Biofiltration system and process for combined and simultaneous treatment of methane and of leachate
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