CN100503782C - Methane oxidation covering material for life refuse landfill - Google Patents

Methane oxidation covering material for life refuse landfill Download PDF

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Publication number
CN100503782C
CN100503782C CNB2007100403587A CN200710040358A CN100503782C CN 100503782 C CN100503782 C CN 100503782C CN B2007100403587 A CNB2007100403587 A CN B2007100403587A CN 200710040358 A CN200710040358 A CN 200710040358A CN 100503782 C CN100503782 C CN 100503782C
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methane
landfill
covering material
mud
mineralized waste
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CN101062848A (en
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赵由才
焦刚珍
牛冬杰
柴晓利
何岩
王星
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Tongji University
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Tongji University
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/91—Use of waste materials as fillers for mortars or concrete

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Abstract

The invention discloses a methane-oxidizing covering material of landfill life waste site, which comprises the following steps: allocating mass percent (dry group) of mineralizing garbage and mineralizing sludge as 20-100% : 0-80%; choosing the mineralizing garbage with grain size at 0. 5mm-4cm and buried above 8 years; choosing the mineralizing sludge with moisture percentage at 50%-70% sludge and buried above 5 years. This invention possesses explicit social benefit and economic benefit and low cost, which can be fit for landfill life waste site widely.

Description

A kind of methane oxidation covering material for life refuse landfill
Technical field
A kind of methane oxidation covering material for life refuse landfill relates to a kind of field covering material that makes reducing emission of greenhouse gas of household garbage landfill site.Belong to the reclamation of solid wastes field.
Background technology
Methane is a kind of important greenhouse gases, to the contribution of global climate Greenhouse effect about 20%.Because methane produces and consume between imbalance, in the past 300 years, the methane concentration in the atmosphere rises to 1.71hd/L by 0.75hd/L, and with the speed of 1%-2% in fast rise.
Research in recent years thinks that landfill yard is after wetland and rice field, the third-largest generation source of methane in the atmosphere.According to statistics, be about 80～10,000,000,000 tons to the annual solid waste that discharges in the whole world in 2002, China is about 600,000,000 tons.Municipal wastes is the important component part of solid waste.According to 24 the provincial capital's statistics in the whole nation, municipal wastes annual progressive increase rate is 9.6%.For terminal disposal of municipal wastes that quantity discharged increases day by day, it is main processing approach that landfill is all selected landfill at world's majority state at present.The U.S. has tens thousand of refuse landfills now, and China almost each big and medium-sized cities is equipped with refuse landfill.Organic waste in the landfill yard in compacting, have the condition bottom fermentation of methanogen effect can discharge the gases methane and the CO of Greenhouse effect 2And in these two kinds of products, the Greenhouse effect of methane are stronger a lot of times than the latter.
Having a liking for methanobacteria can be with CH 4As the energy and carbon source, oxygen is electron acceptor(EA), by methane mono-oxygenase, methanol dehydrogenase, formaldehyde dehydrogenase and four step of hydrogenlyase catalyzed reaction, with the CH in the household refuse landfill sites 4Finally be oxidized to H 2O, CO 2And formation tenuigenin.The methane-oxidizing bacteria oxidizing of methylene generates CO 2, and in this process, obtain the required energy of growth.The first step generates methyl alcohol by methane mono-oxygenase (MMO) with methane activation, and methyl alcohol further is oxidized to formaldehyde, and formaldehyde is assimilate into cellular biomass or be CO by formic acid oxidation again 2, generate CO through a series of dehydrogenation reaction then 2Come back in the atmospheric carbon storehouse, i.e. methyl alcohol → formaldehyde → formic acid → CO 2And water.Wherein, the key enzyme of methane oxidation is methane mono-oxygenase (MMO), and it is a kind of enzyme very low to substrate selective, with a lot of compounds accidental metabolism takes place easily.
Having a liking for methanobacteria all has discovery in fluvial deposit, farmland, forest soil and marsh, huge to global methane cycle influence.
Also contain a large amount of methanobacterias of having a liking in the landfill yard earthing, these bacteriums are extremely important for the discharging of control covering layer of landfill site methane.Overburden soil has reduced the burst size of methane significantly to the oxidation of methane.During the obsolete refuse landfill of Whalen etc. (1990) research, observe overburden soil methane oxidation speed and reach 45g/m 2D is the highest oxidation value of methane in any environment of being reported at present, and overburden soil to concentration from＜1mg/L to the methane oxidation fast of 104mg/L.
Sand is finished by methane-oxidizing bacteria the oxidation of methane, and methane-oxidizing bacteria utilizes methane as the unique carbon source and the energy under aerobic condition, is carbonic acid gas and water through a series of process with methane oxidation.Because the oxidation products CO of methane 2Greenhouse effect than methane a little less than 20 times, therefore, the methane oxidation of landfill yard overburden soil can stop atmospheric methane concentration to increase and Global warming.Processes such as Kightley reach 6 months research, the CH when having investigated three kinds of dissimilar (coarse sand, clay and fine sand) soil as covering layer of landfill site 4Oxidation capacity, the CH of discovery coarse sand 4Oxidation capacity reaches as high as 10.4molm -2d -1(amount to gm -2d -1), oxidation ratio reaches 61%; The CH of clay and fine sand 4Oxidation capacity is low slightly, is respectively 6.8molm -2d -1And 6.9molm -2d -1, oxidation ratio difference 40% and 41%.
The Barlaz of the U.S. etc. have carried out nearly 14 months biological tectum CH at the landfill yard scene 4Reduce discharging capability study, biological tectum is the primary structure layer with garden compost thing, is aided with vegetable layer and layer of displacement, biological tectal CH 4Emission flux remains on 1.73～1.33gm -2d -1Even, at landfill gas recovery system tectal CH out of service 4Oxidation ratio is about 55%, apparently higher than 21% of soil cover.
Some researchs close with this patent have: Yang Shifei etc. alum sludge, dehydration dredging mud, incinerator bottom ash, Sewage Plant not in digested sludge and the digested sludge preliminary screening go out alum sludge and can satisfy landfill yard covering material processing requirement substantially.But such material contracts is bigger, need carry out modification and handle.
Also there is research to substitute soil as covering material in recent years with industrial dregs and building spoir.Though this covering material can solve nature soil and take problem, and can provide outlet, can not contain that methane produces release for the processing of discarded dregs.
Alkaline residue (white clay) is as the landfill yard covering material: by permeability test, pollutant removal test dialogue cement-mixed soil is estimated as the performance of landfill yard covering material in the percolate.Studies show that: white clay and the covering material that can be used as landfill yard after fine sand soil mixes by suitable proportion can remedy the shortage of landfill yard covering material effectively.White clay content is that 20% composite soil is to COD, NH in the percolate 4The clearance of one N can reach 40%～60%.But document is not studied methane oxidation and restraining effect.The another kind of compound embedding material of reporting is mainly by sand, or soil, or gravelly soil and interpolation material natural nano-material composition.The proportion that wherein adds material accounts for 5%～25%.This material cost is expensive, is difficult to accept for medium and small landfill yard.
Relevant patent aspect, the landfill yard covering material cooperates natural nano-material to do subsidiary material and does the landfill yard covering material relevant for based on sand, soil or gravelly soil.It is introduced that this material can prevent effectively that rainwater infiltration to rubbish body from changing into and ooze drop liquid.This seminar had the patent of this aspect originally, it is characterized in that: fresh dewatered sludge and the mineralized waste that mixes 2～7 parts of weight wherein by 10 parts of weight are formed.Because of dewatered sludge does not have methane oxidation effect (can under anaerobic produce a large amount of methane on the contrary), dewatered sludge-mineralized waste mixing material only limits to be used as the landfill yard covering material, does not have the methane oxidation effect.
Summary of the invention
The objective of the invention is to disclose a kind of technology high covering material of methane oxidation efficient that is applicable to middle-size and small-size household refuse landfill sites simple, with low cost.
For reaching above-mentioned purpose, the present invention mixes with mineralising mud with mineralized waste and makes the landfill yard covering material.Induce the methane-oxidizing bacteria of the rich amount of generation in the mineralized waste via the long-term domestication of landfill gas.Mineralising mud can provide rich nutrient substances for methane-oxidizing bacteria.After mineralized waste mixed with mineralising mud, the methane oxidation effect obviously strengthened under compacting and the methane aggregation conditions.This covering material carries out bio-oxidation by the effect methane gas that fermentation produces to domestic refuse of methane-oxidizing bacteria wherein, realizes the reduction of discharging of landfill yard greenhouse gases.
Being defined as of the mineralized waste of indication of the present invention: in butt, its solid product is reduced to organic content 9-15%, loading capacity 120-140mmol/100g, bacterial count 1-9 * 10 after the landfill yard domestic refuse is by the biological degradation of several years 6Become stable mineralized waste, its adsorption specific surface area 5-6m when the nearly neutral 7.5 of individual/g, pH value, saturated waterpower coefficient of permeability K s1-1.3cm/min 2/ g, total nitrogen 0.5%, total phosphorus and total potassium are about 1%.Mineralized waste is a kind of good biological sewage treatment medium, also can be used as a kind of afforestation medium simultaneously.Domestication contains a large amount of methanobacteria bacterial classifications of having a liking for to mineralized waste through the methane under the landfill condition over a long time.
Its mud can be converted into mineralising mud after the municipal sewage sludge landfill yard closed 3-4 years.At this moment, the mud organic matter drop to 40%, the soybean germination index greater than 80%, BDM drops to 5%.Contain abundant microbial nutrition material in the mineralising mud, exist and have a liking for the methanobacteria bacterial classification in a large number.It must be noted that mineralising mud and fresh dewatered sludge are big at the methane oxidation heteropole that is wanting in.The former has stronger methane oxidation effect, and the latter then fully should effect.
Component of the present invention and mass percentage content (butt) are as follows:
Mineralized waste (particle diameter is between 0.5mm～4cm): 70%;
Mineralising mud: 30%;
Basicly stable landfill yard mineralized waste after exploitation, screening, can be obtained 50%～60% fines, fines through broken, sorting to particle diameter d in 0.5mm～4cm scope, water ratio is 20%～30%.Mineralising mud is taken from the sludge landfill that closes more than 3 years, and preferably the landfill yard landfill is more than 5 years, and water ratio is 30%～50% mud.
The present invention has following advantage:
1. the raw material of the present invention's utilization is waste.Mineralized waste belongs to the landfill refuse, and mineralising mud also belongs to the refuse that needs are handled.Therefore, be the treatment of wastes with processes of wastes against one another, realize the landfill yard reduction of greenhouse gas discharge, have obvious social and economic benefit.
With the present invention according to day tectum 15～25cm, intermediate cover layer 30～40cm and the above conventional covering process of final tectum 60cm carry out operation, the methane oxidation assimilated efficiency obviously exceeds 20%～30% than common landfill yard covering material.
3. low cost of manufacture of the present invention can be promoted widely.
Description of drawings
Fig. 1 is a process flow sheet of the present invention
Fig. 2 is a mineralized waste; Mineralising mud; Common mulching soil; The total DNA cloning figure of methane-oxidizing bacteria among the Marker
As shown in Figure 2, the mineralized waste of swimming lane (left side → right side) demonstration; Mineralising mud; Common mulching soil; The total DNA of Marker sample gene group is that template pcr amplification result shows that mineralized waste methane-oxidizing bacteria quantity is maximum, secondly is mineralising mud, and common mulching soil is the poorest.
Embodiment
Embodiment 1.
See also accompanying drawing 1.
The mass percent of the raw material that the present invention is used is mineralized waste (0.5mm～4cm): mineralising mud=70%:30% (butt).
Insert the domestic refuse reaction column as covering material after above-mentioned raw materials mixed.Under the room temperature, 5 reaction column lower ends are inserted by different proportioning blended methane and CO 2Mixed gas (methane content is between 50-60%).In pillar lowest layer stent support.Add totally three layers of the domestic refuse handled through preliminary screening and covering materials above the support successively.Domestic refuse thickness is 30cm, and tectum the 1st, 2 layer thickness is 18cm, and final cover thickness is 30cm.Test point is located at each tectum upper end, after the sealing test point 3 is set on the final tectum.CH 4Content is by the GC-14B gas chromatograph for determination of SHIMADZU company.The methane oxidation effect is as shown in table 1.
Table 1 Different Covering Material is to the oxidation effectiveness contrast table of methane in the household refuse landfill sites biogas
Different Covering Material Soil Mineralising mud Mineralized waste Mineralising mud+mineralized waste
Methane oxidation rate (%) 30—40 10—20 50—70 70—80
Annotate: soil is taken from Shanghai Lao Gang household refuse landfill sites overburden soil in the table, and mineralising mud and mineralized waste are also taken from old port household refuse landfill sites.Mineralized waste obtains 50%～60% fines after exploitation, screening, fines through broken, sorting to particle diameter d in 0.5mm～4cm scope.Mineralising mud was taken from the landfill yard landfill more than 3 years, and water ratio is 30%～50% mud.
Embodiment 2
Adopt the experiment identical with embodiment 1, with totally 4 kinds of mineralising mud, soil, mineralized waste, mineralized waste and mineralising mud mixtures (covering material of the present invention), during respectively as covering material for house refuse landfill site, the methane oxidation rate in the category sludge gas is respectively 10～20,30～40,50～70,70～80%.Therefore, mineralized waste or mineralized waste and mineralising mud (dry weight is than 7:3) mixture have higher oxygenizement to the methane in the household refuse landfill sites biogas.
From molecular level methane-oxidizing bacteria mineralized waste, mineralising mud, the common mulching soil is analyzed, found that kind and the quantity of methane-oxidizing bacteria in the mineralized waste is obviously many than common overburden soil and mineralising mud.Sequencing result shows: the mxaf gene in the mineralized waste has various mutant form, has further confirmed the diversity of its contained methane-oxidizing bacteria, comprises methyl bacterium genus, methyl Campylobacter and methyl sporangiocyst Pseudomonas etc.; Methane-oxidizing bacteria is more single in the mineralising mud, belongs to the methyl bacterium and belongs to; The mxaf gene also has multiple different mutant form in the common overburden soil, belongs to based on the methyl bacterium.
Assay is as follows: methane-oxidizing bacteria counting in mineralized waste, mineralising mud, the pedotheque specifically sees Table 2.
Table 2 soil, methane-oxidizing bacteria situation (butt) in mineralising mud and the mineralized waste
Different Covering Material Soil Mineralising mud Mineralized waste
Methane-oxidizing bacteria quantity 8.68×10 5-6Individual/g 6.68×10 6-7Individual/g 12.5×10 7-8Individual/g
Measure methane-oxidizing bacteria quantity by rolling Guan Fayi, the population of finding methane-oxidizing bacteria in the mineralising mud is than many in mineralized waste and the pedotheque; According to mxaf is methyl desaturase ((methanol dehydrogenase total in the methane-oxidizing bacteria metabolism, MDH) subunit, the conserved sequence of design mxaf is PCR, find that under equal conditions the band of mineralized waste is obviously bright than the band of other samples, than other samples of the kind that contains methane-oxidizing bacteria in the sample of mineralized waste and quantity are described more; Again according to sequencing result, find that the mxaf gene in the mineralized waste has various mutant form, this result has confirmed that through a step methane-oxidizing bacteria kind is a lot, and have the methyl bacterium to belong to and, the methyl Campylobacter, methyl sporangiocyst Pseudomonas etc.; And the mxaf gene in the mud has only a kind of form, and this methane-oxidizing bacteria belongs to the methyl bacterium and belongs to; Mxaf gene in the pedotheque also has various mutant form, illustrates that the methane-oxidizing bacteria in the pedotheque is also a lot, and the overwhelming majority is that the methyl bacterium belongs to.
Can find that mineralized waste and mineralising mud can make the more common covering material of methane oxidation efficient exceed 20%～30% according to 7:3 ratio making landfill yard covering material under the laboratory simulation condition., can reach a conclusion: covering material for house refuse landfill site of the present invention is with low cost for this reason, and methane oxidation rate height has broad application prospects.

Claims (3)

1. methane oxidation covering material for life refuse landfill is characterized in that: the component of this material and content are the mineralized wastes with the butt metering: mineralising mud=70%:30% mass percent.
2. a kind of methane oxidation covering material for life refuse landfill according to claim 1 is characterized in that: described mineralized waste is a landfill more than 8 years, and particle diameter is the mineralized waste of 0.5mm～4cm, and water ratio is 20%～30%.
3. a kind of methane oxidation covering material for life refuse landfill according to claim 1 is characterized in that: described mineralising mud is landfill yard landfill more than 3 years, and water ratio is 30%～50% mud.
CNB2007100403587A 2007-04-30 2007-04-30 Methane oxidation covering material for life refuse landfill Expired - Fee Related CN100503782C (en)

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Families Citing this family (14)

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Publication number Priority date Publication date Assignee Title
CN101791618B (en) * 2010-02-09 2012-11-14 浙江大学 Refuse landfill obnoxious gas in-situ control method
CN101823072B (en) * 2010-04-27 2012-05-23 同济大学 Method for strengthening methane oxidation of covering layer of landfill site
WO2011147093A1 (en) * 2010-05-28 2011-12-01 Empire Technology Development Llc System and method for oxidizing methane
CN101966422B (en) * 2010-09-26 2013-06-05 环境保护部南京环境科学研究所 Method for processing CH4 in landfill site after acclimatizing and mineralizing garbage by utilizing percolate
JP5928056B2 (en) * 2012-03-23 2016-06-01 Ｊｆｅスチール株式会社 Method for suppressing generation of methane-containing gas from bottom sediment of water
CN103406328B (en) * 2013-08-28 2015-11-18 上海交通大学 A kind of composite cover material for refuse landfill and application process thereof
CN103497921B (en) * 2013-10-29 2016-04-13 苏州科技学院 The method of the preparation method of methane-oxidizing bacteria bacterium liquid, Covering Material of Refuse Landfill and refuse landfill methane emission reduction
CN105798048A (en) * 2016-03-18 2016-07-27 中国环境科学研究院 Oxide layer material capable of adsorbing and degrading methane gas and preparation method and application of oxide layer material
CN106180114A (en) * 2016-07-11 2016-12-07 中国环境科学研究院 A kind of quasi-aerobic landfill end cover layer
CN106111655A (en) * 2016-07-11 2016-11-16 中国环境科学研究院 The methane control method of one way of life rubbish quasi-aerobic landfill
CN106424075B (en) * 2016-12-08 2022-09-30 中兰环保科技股份有限公司 Novel covering system for landfill gas in-situ treatment of aerobic remediation of landfill
CN109465275B (en) * 2018-10-24 2022-07-12 贵州欧瑞欣合环保股份有限公司 Sludge-based refuse landfill covering material
CN114804565B (en) * 2022-04-29 2023-04-14 青岛理工大学 Low-temperature anaerobic fermentation method for high-solid-content sludge
CN115213190B (en) * 2022-07-18 2023-07-28 青岛理工大学 Method and device for accelerating methane generation and oxidization of landfill site and cooperatively fixing carbon

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