CN101966422B - Method for processing CH4 in landfill site after acclimatizing and mineralizing garbage by utilizing percolate - Google Patents

Method for processing CH4 in landfill site after acclimatizing and mineralizing garbage by utilizing percolate Download PDF

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CN101966422B
CN101966422B CN2010102927324A CN201010292732A CN101966422B CN 101966422 B CN101966422 B CN 101966422B CN 2010102927324 A CN2010102927324 A CN 2010102927324A CN 201010292732 A CN201010292732 A CN 201010292732A CN 101966422 B CN101966422 B CN 101966422B
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percolate
garbage
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CN101966422A (en
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张后虎
张洪玲
张毅
吴睿
孙庆窑
蒯广东
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Nanjing Institute of Environmental Sciences MEP
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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
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
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    • 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
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/20—Waste processing or separation

Abstract

The invention discloses a method for processing CH4 in a landfill site after acclimatizing and mineralizing garbage by utilizing a percolate, belonging to the field of a percolate processing and greenhouse gas emission reduction method in a landfill site. The method comprises the following steps: (1) lifting the percolate to an adsorption material layer, wherein the adsorption material layer comprises an active carbon layer and a macroporous resin layer, and the water distribution load is 0.05 to 0.50m<3>/(m<3>mineralized garbage.d); (2) lifting the effluent of the garbage percolate after processing to a mineralized garbage packing layer to be processed, wherein the water distribution load is 0.05 to 0.30m<3>/(m<3>mineralized garbage.d); and (3) adding a mineralized garbage layer after acclimatizing the garbage percolate obtained by carrying out the step (2) between a drainage layer and a vegetable layer or below the drainage layer in the construction of a final covering layer in the landfill site.The invention has the advantages that the garbage percolate is processed; the mineralized garbage is recycled; the toxicity is eliminated and ammonia nitrogen components are remained by preprocessing the percolate; the acclimatization and enrichment of ammonia oxidation bacteria are utilized to oxidize CH4; and the release total equivalent of greenhouse gas in the landfill site is reduced.

Description

Percolate domestication mineralized waste post processing landfill yard CH 4method
Technical field
The present invention relates to percolate from garbage filling field processing and landfill yard greenhouse gases total amount and discharge discharge-reducing method, say more specifically and utilize the ammonia nitrogen of percolate middle and high concentration in landfill yard to realize domestication and the enrichment of ammonium oxidation bacterium in mineralized waste, based on ammonium oxidation bacterium to methane (CH 4) feature of equal oxidability, the mineralized waste that recycling enrichment ammonium oxidation bacterium is processed builds the method that the refuse landfill cover layer carrys out oxidation CH4.
Background technology
Global warming has become the great environmental problem of World Focusing.In Kyoto Protocol, anxious main greenhouse gas to be reduced discharging comprises: CO 2, CH 4and N 2o.Intergovernmental Panel on Climate Change's statistics in 2007 shows: CH in 2004 4and N 2it is 14.3% and 7.9% of greenhouse gas emission total amount that O accounts for global people, is only second to CO 2(76.7%).Wherein, CH 4and N 2it is CO that O unimolecule a century heats potentiality 223 times and 296 times, in addition, N in atmosphere 2o also has the energy damaged the ozone layer.
At present, correlative study mainly concentrates on the ecosystems such as farmland, meadow, wetland and forest land, and carbon nitrogen source is enriched, transforms CH in household refuse landfill sites more sharply 4and N 2the releasing research scarcity of O.Only document shows, household refuse landfill sites is CH 4and N 2the great source of release of O.Refuse landfill CH 4being mainly derived from the anaerobic degradation of landfill waste, is CH 4great source of release, account for global CH 4more than 10% of total volume, and the ratio of the states such as the U.S., Holland is even up to more than 20%, and China lacks refuse landfill CH 4the spatial and temporal variation research discharged and corresponding total amount statistics.Landfill yard N 2o mainly is formed at microorganism nitration denitrification effect in overburden soil, is the accessory substance of nitrifying process and the intermediate product of denitrification process.N in household refuse landfill sites 2the release rule research of O is comparatively rarely seen, and its total volume is not yet added up.Wherein, the people such as Rinne is to Finland
Figure BDA0000027084520000011
the N of landfill yard 2o discharges flux and monitors, and found that than high 1～2 order of magnitude of the highest release flux of northern farmland, Europe and forest.Zhang Houhu etc. take season as time scale to China Shanghai and 3 kinds of greenhouse gases (CH of Hangzhou household refuse landfill sites 4, N 2o and CO 2) carried out annual Simultaneous Monitoring, unification as a result is converted into to CO 2find CH after discharging equivalent 4burst size accounts for dominant advantage, up to more than 95%.The key of refuse landfill reduction of greenhouse gas discharge for this reason, is to control CH 4burst size.
Landfill gas (Landfill Gas, LFG) active collection system can effectively reduce the CH in landfill yard 4dividing potential drop, make it discharge motive force and reduce.In addition, CH 4gas is oxidized by oxygen and is converted into CO under the effect methane-oxidizing bacteria through landfill yard end cover layer the time 2, water and living beings, thereby reduce the methane of eliminating landfill yard even fully, discharge.Czepiel etc. and Chanton etc. utilize isotope analysis to record landfill yard cover soil layer oxidation CH 4be about 10% left and right that produces total amount; And the result of the researchs such as Bergamaschi is the CH of oxidation more than 80% 4.The CH of soil 4there are positive correlation in oxidability and temperature, the not only CH of complete oxidation landfill yard discharge of landfill yard overburden layer even occurs 4, can also absorb CH in the oxidation atmosphere 4become phenomenon (the Zhang H.H. of " remittance ", He P.J., Shao LM.Methane emissions from MSW landfills with sandy cover soils under leachate recirculation and subsurface irrigation.Atmospheric Environment, 2008,42 (22): 5579-5588.).
Except methane-oxidizing bacteria, Mandernack etc. find in farmland that at landfill yard and Cai Zucong etc. ammonium oxidation bacterium is to possessing equally oxidation CH 4ability.CH 4and NH 4 +the tetrahedral molecule structure similar, molecular weight is close, CH 4mO is very similar with ammonium MO structure, and is respectively CH 4the key factor of oxidation and ammonium oxidation.Methane-oxidizing bacteria and ammonium oxidizing bacteria have general character in many aspects: (1) substrate utilization aspect: have at least 10 kinds of materials can be simultaneously as methane-oxidizing bacteria and the common substrate of ammonium oxidizing bacteria; (2) hydroxylamine oxidase not only plays a significant role in some methane-oxidizing bacteria oxidizing of methylene processes, and its 26S Proteasome Structure and Function is very similar to some enzymes in the ammonium oxidizing process simultaneously; (3) methane-oxidizing bacteria and ammonium oxidizing bacteria all have very complicated kytoplasm inner membrance; (4) methane-oxidizing bacteria and ammonium oxidizing bacteria all belong to strict aerobic bacteria, can coexist in some Aerobic-anaerobic crossing interfaces, and there is CH in this in territory slightly simultaneously 4, NH 4 +-N and O 2(Cai Zucong, Mosi A.R. soil water regime is to CH 4oxidation, N 2o and CO 2the impact of discharge. soil, 1999,31 (6), 289-294.).Therefore, under the adapt circumstance condition, the oxidable ammonium nitrogen of methane-oxidizing bacteria, the ammonium oxidizing bacteria is oxidable methane also.Thereby can consider to carry out oxidation CH by enrichment ammonium oxidation bacterium in the refuse landfill cover layer 4, for the greenhouse gases burst size of cutting down landfill yard provides technological approaches.
Meanwhile, percolate is topmost problem of environmental pollution in landfill yard, and percolate is the Refractory organic compounds waste water (COD of a kind of ammonia nitrogen concentration high (500～3000mg/L), complicated component cr=3000～15000mg/L), salinity and heavy metal concentration are high, therefore be difficult to process with traditional domestic sewage treatment process the domestic method that has scholar's research to utilize mineralized waste disposal of refuse percolate.Mineralized waste refers to city life garbage landfill, and after the closing several years, (southern area is more than 8～10 years, northern area is more than 10～15 years), in rubbish, easy degradation material has been degraded substantially, biodegradable content of material is less than 3%, the rubbish outer appearnce is similar to humus, is the microparticle shape, and quality is loose, have countless micropores, such rubbish is referred to as mineralized waste.Above-mentioned mineralized waste, after excavation, airing and simple screening, can obtain the native fines of class humus.Be characterized in that unit weight is light, porosity is high, infiltration coefficient is large, there is higher cation exchange capacity, the content of organic matter and abundant nutritional labeling, bacterial species is many, quantity is large, and microbial metabolism power is strong, active good, and enzymatic reaction and physiological and biochemical procedure intensity are large [20-21].Research to fundamental characteristics such as mineralized waste heavy metal full dose mensuration, Leaching check and pathogenic analyses, all unanimously showing that mineralized waste has is difficult to pollutant purification performance that form, very good under field conditions (factors), be good percolate biology treatment media, be applied to building mineralized refuse bioreactor and processed the percolate in landfill yard.It is abundant that the mineralized waste nitrification ability is strong, ammonium oxidation flora falls, as large-size horizontal aged refuse reactor NH 3when the influent concentration of-N is 538.5～1583.0mg/L, hydraulic load is in 0.027～0.030m 3/ (m 3mineralized waste d), under service condition, aged refuse reactor is to NH 3the clearance of-N can be up to being 96.9～99.8%, the concentration of final outflow water can reach concentration of emission limit value (the 25mg/L) (Li Hongjiang in " household refuse landfill sites pollutes control criterion (GB16889-2008) ", Zhao Youcai, Zhang Wenhai, Deng. the removal research of mineralized waste to Organic Pollutants of Landfill Leachate and metallic element. Chinese water supply and drainage, 2008,24 (19): 106-108.).
Barlaz etc. also attempt utilizing garden dumping product (Yard waste compost) to build biological cover layer (Biological active cover) and cut down CH 4release; by being applied to refuse landfill work place study and showing by means of isotope technology; the biological cover layer that rubbish builds is to oxidable 55% methane gas; soil cover only can oxidation 21% methane (BarlazM.A.; Green R.B.; Chanton J.P., et al.Evaluation of a biological active cover for mitigation of landfill gas emissions.Environmental Science & Technology, 2004,38:4891-4899.).And the rarely seen correlative study that relates to the refuse landfill Technology of Reducing Greenhouse Gas Emissions, more fail to relate to mineralized waste after percolate domestication enrichment ammonium oxidation bacterium to CH 4the derivative research of oxidability.
In percolate, containing poisonous, the chemical substance of especially mutagenesis, aberration inducing and carcinogenesis, in addition, contain a certain amount of heavy metal components in percolate, and cultivation and the enrichment of ammonium oxidation bacterium existed to negative effect.And the toxic component such as organic pollution and heavy metal in the alternative adsorbing separation percolate of the sorbing materials such as macroporous absorbent resin and active carbon, purpose retains water-soluble ammonia and nitrogen components.
Summary of the invention
The technical problem that invention will solve: the percolate and the reluctant problem of methane that for refuse landfill, produce the invention provides percolate domestication mineralized waste post processing landfill yard CH 4method, at first utilize the toxic components such as organic pollution in sorbing material absorption percolate and heavy metal, retain high concentration, water miscible ammonia nitrogen component; Percolate after anticipating is tamed and is cultivated enrichment ammonium oxidation bacterium the mineralized waste filler; According to ammonium oxidation bacterium to methane (CH 4) equal oxidability, build the CH in the household refuse landfill sites cover layer 4oxide layer, make percolate and methane well to be processed, and reduced the concentration of methane.
The principle of the invention: for ammonium oxidation bacterium to methane (CH 4) feature of equal oxidability, at first active carbon, macroreticular resin or sorbing material packed column are set percolate is carried out to pre-process, the toxic components such as organic pollution wherein of absorption and heavy metal.Retain the ammonia nitrogen in high density component through pretreated percolate, be used to domestication and the enrichment of ammonium oxidation bacterium in mineralized waste.Recycling ammonium oxidation bacterium is to CH 4equal oxidability, realize the reduction of discharging of refuse landfill greenhouse gases.Wherein, the methane oxidation layer that mineralized waste builds is arranged between drainage blanket and impervious barrier.
The objective of the invention is to be achieved through the following technical solutions:
Percolate domestication mineralized waste post processing landfill yard CH 4method, the steps include:
(1) at first adopt pump power that percolate is promoted to sorbing material layer, sorbing material layer from top to bottom adopts active carbon layer and macroreticular resin layer to form; The water distribution load is 0.05～0.50m 3/ (m 3mineralized waste d);
(2) water outlet of percolate after step (1) is processed, be promoted to the mineralized waste packing layer through secondary pump strength and processed, and the water distribution load is 0.05～0.30m 3/ (m 3mineralized waste d);
(3), in the whole cover layer construction of household refuse landfill sites, between drainage blanket and vegetable layer, or the drainage blanket below increases the mineralized waste layer after the percolate obtained after step (2) operation is tamed.
Wherein in step (1), the active carbon layer floor height is 30-50cm, and macroreticular resin is high layer by layer is 20-50cm.In step (2), mineralized waste packing layer floor height is 20-60cm.In step (3), mineralising waste layer floor height is 30cm～50cm.
Beneficial effect: percolate domestication mineralized waste post processing landfill yard CH of the present invention 4method, make both processed percolate also regeneration mineralized waste, 1) innovative design of " treatment of wastes with processes of wastes against one another ": the present invention mainly utilizes excavation landfill landfill waste for many years, ammonia nitrogen (organic pollution and heavy metal are by adsorbing separation such as resins) by percolate middle and high concentration in landfill yard, inquire into by the pretreatment percolate and remove toxicity reservation ammonia nitrogen component, realize domestication and the enrichment of ammonium oxidation bacterium in mineralized waste, the mineralized waste that recycling enrichment ammonium oxidation bacterium is processed builds the refuse landfill cover layer and carrys out oxidation CH4, reduce the refuse landfill greenhouse gases and discharge total yield.2): the non-secondary pollution risk: in domestication enrichment ammonium oxidation bacterium process, the mineralized waste filler is other compositions such as Adsorption of Heavy Metals, organic pollution, phosphorus simultaneously, and be covered in household refuse landfill sites, rely on a seepage control system of inner bottom part setting can avoid above-mentioned pollution risk.
The accompanying drawing explanation:
Fig. 1 process chart of the present invention, wherein 1: the percolate regulating reservoir; 2: elevator pump; 3: water distribution pipe; 4: sorbing material layer; 5: collecting-tank; 6: the mineralized waste packing layer;
The tectal method of refuse landfill of mineralized waste oxidation landfill yard methane layer building-clay covered structure schematic diagram after Fig. 2 serves as reasons and tames, wherein, 7: the Nutrition Soil vegetable layer, 8: drainage blanket, 9, mineralized waste methane oxidation layer of the present invention, 10: the impervious clay layer, 11: exhaust level, 12: waste layer.
The tectal method of refuse landfill of mineralized waste oxidation landfill yard methane layer building-artificial material covered structure schematic diagram after Fig. 3 serves as reasons and tames, wherein 7: the Nutrition Soil vegetable layer, 8: drainage blanket, 9: mineralized waste methane oxidation layer of the present invention, 13: protective layer on film, 14: film lower protective layer, 111: exhaust level; 12: waste layer; The 15:HDPE geomembrane.
The specific embodiment:
Now further illustrate the present invention with embodiment by reference to the accompanying drawings:
Embodiment 1: percolate adopts pump power 2 to promote from percolate regulating reservoir 1, by water distribution pipe 3 to sorbing material layer 4, sorbing material layer from top to bottom adopts active carbon layer (25cm is high)/macroporous absorbent resin layer (model H103,25cm is high, Chemical Plant of Nankai Univ.) form, the water quality index of percolate is: COD cr=3000-8000mg/L, BOD 5=1000-2000mg/L, NH 4 +-N=1350-2870mg/L, Fe 3+=1200-2300mg/L, Pb 2+=12-35mg/L, Zn 2+=123-267mg/L, the water distribution hydraulic load is in 0.03～0.15m 3/ (m 3sorbing material d), under service condition, effluent quality is COD cr=800-2500mg/L, BOD 5=500-1200mg/L, NH 4 +-N=950-2500mg/L, Fe 3+=100-350mg/L, pb 2+=2-5mg/L, Zn 2+=18-35mg/L.Water outlet is promoted to mineralized waste packing layer 6 (Fig. 1) through secondary pump strength, and the water distribution load is 0.05～0.35m 3/ (m 3mineralized waste d), the percolate after processing is disposed to collecting-tank 5 through subsequent treatment again.After continuous service 100～200 days, mineralized waste can be used as refuse landfill methane oxidation layer matrix fill through domestication, and wherein ammonium oxidation bacterium number has original 4～5 * 10 4individual/(the dry rubbish of g) develops rapidly and becomes 3～5 * 10 5individual/(the dry rubbish of g).
According to China's industry standard, (house refuse Sanitary Landfill Technology standard: in CJJ 17-2004)-clay blanket structure, at first the landfill waste top is the exhaust level of coarse grain or porous material, and thickness is greater than 30cm; Secondly by the employing permeability, poor sticky soil horizon covering is filled out rubbish and is played the parcel function, serves as the antiseepage effect simultaneously, and its antiseepage coefficient should not be greater than 1.0 * 10 -7cm/s, thickness is greater than 20cm.The CH that rubbish is produced 4can, to greatest extent by the collected utilization of gas gathering system, prevent the invasions such as rainfall snow-broth simultaneously.
And then the mineralized waste layer methane oxidation layer 9 after the percolate domestication of covering the present invention design, thickness is between 30～60cm.The final sandy soil drainage blanket that covers, thickness is 20cm～30cm, utilizes the characteristic that its permeability is good, oxidation is not collected the CH of escape again 4gas (referring to Fig. 2).And drainage blanket 8 tops are Nutrition Soil vegetable layer 7, be not less than 15cm.
By reaching the field monitoring of 12 months, test landfill yard intermediate cover layer section CH simultaneously 4gas concentration distributes and surface discharges flux.Result shows: from 80cm under soil to 15cm, the soil gas methane concentration reduces up to 62～85vol%.By comparing with external data, be not difficult to find refuse landfill CH of the present invention 4discharge flux annual mean low (in Table 1), wherein than Finland
Figure BDA0000027084520000051
refuse landfill and U.S. Leon refuse landfill are hanged down 1 more than the order of magnitude.
Table 1: the annual CH of the refuse landfill intermediate cover layer of invention 4discharging the flux average compares with external data
Figure BDA0000027084520000052
Figure BDA0000027084520000061
Embodiment 2: percolate regulating reservoir 1 adopts pump power 2 to promote, by water distribution pipe 3 to sorbing material layer 4, sorbing material layer from top to bottom adopts active carbon layer (30cm is high)/macroporous absorbent resin layer (model D3520,20cm is high, Chemical Plant of Nankai Univ.) form, the water quality index of percolate is: COD cr=3500-12000mg/L, BOD 5=3700-4500mg/L, NH 4 +-N=1780-2670mg/L, Fe 3+=1100-2500mg/L, Pb 2+=16.5-35.3mg/L, Zn 2+=167-285mg/L, percolate water distribution hydraulic load is in 0.01～0.03m 3/ (m 3sorbing material d) under service condition,, effluent quality is COD cr=1100-4600mg/L, BOD 5=800-1200mg/L, NH 4 +-N=950-2380mg/L, Fe 3+=80-260mg/L, pb 2+=4.5-7.8mg/L, Zn 2+=21-29mg/L.Water outlet is promoted to mineralized waste packing layer 6 through secondary pump strength, and the water distribution load is 0.15～0.20m 3/ (m 3mineralized waste d), the percolate after processing is disposed to collecting-tank 5 through subsequent treatment again.Move after 450 days, mineralized waste can be described as refuse landfill methane oxidation layer matrix fill through domestication.Wherein ammonium oxidation bacterium number has original 4～5 * 10 4individual/(the dry rubbish of g) develops rapidly and becomes 7～8.5 * 10 6individual/(the dry rubbish of g).
According to China's industry standard, (house refuse Sanitary Landfill Technology standard: in CJJ 17-2004)-artificial material tectum structure, at first landfill waste layer 12 top are the exhaust level 11 of coarse grain or porous material, and thickness is greater than 30cm; Secondly be film lower protective layer 14 clays, thickness is 20～30cm, and at laying HDPE geomembrane 15, thickness should not be less than 1mm, protective layer 13 on film is set, drainage blanket should adopt coarse grain or how empty material, and thickness is preferably 20～30cm; On cover again mineralized waste methane oxidation layer 9 of the present invention, thickness is between 30cm～50cm.The final grittiness soil horizon that covers is as vegetable layer 7, and thickness should be between 20～30cm (referring to Fig. 3).
By reaching the field monitoring of 12 months, test landfill yard intermediate cover layer section CH simultaneously 4gas concentration distributes and surface discharges flux.Result shows: from 80cm under soil to 15cm, the soil gas methane concentration reduces up to 73～95vol%.By comparing with external data, be not difficult to find refuse landfill CH of the present invention 4discharge flux annual mean low (in Table 2), wherein than Finland
Figure BDA0000027084520000062
refuse landfill and U.S. Leon refuse landfill are hanged down 1 more than the order of magnitude.
Table 2: the annual CH of the refuse landfill intermediate cover layer of invention 4discharging the flux average compares with external data
Figure BDA0000027084520000063
Figure BDA0000027084520000071

Claims (4)

1. a percolate is tamed mineralized waste post processing landfill yard CH 4method, the steps include:
(1) at first adopt pump power that percolate is promoted to sorbing material layer, sorbing material layer from top to bottom adopts active carbon layer and macroreticular resin layer to form; The water distribution load is 0.05～0.50m 3/ (m 3sorbing material d);
(2) water outlet of percolate after step (1) is processed, be promoted to the mineralized waste packing layer through secondary pump strength and processed, and the water distribution load is 0.05～0.30m 3/ (m 3mineralized waste d);
(3), in the whole cover layer construction of household refuse landfill sites, between drainage blanket and vegetable layer, or the drainage blanket below increases the mineralized waste layer after the percolate obtained after step (2) operation is tamed.
2. percolate according to claim 1 is tamed mineralized waste post processing landfill yard CH 4method, it is characterized in that in step (1) that the active carbon layer floor height is 30～50cm, macroreticular resin is high layer by layer is 20～50cm.
3. percolate according to claim 2 is tamed mineralized waste post processing landfill yard CH 4method, it is characterized in that in step (2) that mineralized waste packing layer floor height is 20～60cm.
4. according to the described percolate domestication of claim 2 or 3 mineralized waste post processing landfill yard CH 4method, it is characterized in that in step (3) that mineralising waste layer floor height is 30cm～50cm.
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