CN101884995A - Covering layer for controlling CH4 release in refuse landfill by using aged refuse - Google Patents
Covering layer for controlling CH4 release in refuse landfill by using aged refuse Download PDFInfo
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- CN101884995A CN101884995A CN2009100279606A CN200910027960A CN101884995A CN 101884995 A CN101884995 A CN 101884995A CN 2009100279606 A CN2009100279606 A CN 2009100279606A CN 200910027960 A CN200910027960 A CN 200910027960A CN 101884995 A CN101884995 A CN 101884995A
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- landfill
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- mineralized waste
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Abstract
The invention relates to the technology of secondary pollutant control and aged refuse comprehensive utilization in the house refuse refilling process, and belongs to the fields of waste recycling and environmental protection. The invention has the advantages of comprehensively regarding the utilization of aged refuse and emission reduction of greenhouse gas CH4 in the landfill. The emission reduction of the greenhouse gas is realized by constructing an intermediate covering layer which consists of different types of soils and the aged refuses on the premise of meeting national industrial standard (Technical Code for Sanitary Landfill of Municipal Solid Waste: CJJ 17-2004). The technology is characterized by soil type selection, wherein clayed soil layer (more than 30cm) with poor permeability is adopted to cover the landfill to play a role in covering, so that the CH4 generated by the landfill can be collected and utilized by a gas collection system furthest; and a sand soil layer (more than or equal to 30cm) is covered finally after an aged refuse layer (more than or equal to 30cm) is laid, so that the CH4 gas which is not collected and escapes is oxidized by using the advantages of the excellent permeability of the aged refuse layer and the sand soil. The selected sand soil has the characteristics that: the soil is acidic (pH is between 4 and 6) and lean, the content of organic substances is less than 2.5 percent, the content of organic carbon is less than 1 percent, and the content of total nitrogen is 0.2 percent so as to reduce the release of N2O.
Description
Technical field
The present invention relates to secondary pollutant control and landfill yard mineralized waste comprehensive utilization technique in the consumer waste filling and embedding process, belong to castoff regenerative utilization and field of environment protection.
Background technology
CH
4And N
2O is important greenhouse gases, and the contribution of greenhouse effects is only second to CO
2(Intergovernmental Panel onthe Climate Change, 2001).Relative CO
2, CH in the atmosphere
4And N
2The concentration of O is low, but that it heats potentiality is strong, is respectively CO
223 times and 296 times (Intergovernmental Panel on the Climate Change, 2001).Correlative study shows, CH in the atmosphere
4About 80% comes from the microbial process of anaerobic environment, and organic matter progressively is degraded to simple organic acid through the hydrolysis acidification process, is converted into methane by methanogen again.According to statistics, surpass 10%CH
4Come from refuse landfill, national refuse landfill methane burst size such as the U.S., Germany even up to 20～30% (Intergovernmental Panel on the ClimateChange, 2007).
The N in the whole world 50～60%
2The nitration denitrification process that O comes from edaphon discharges.The garbage loading embeading field system is the product of land use transfer process, and the bibliographical information refuse landfill is N
2The great source of release of O, Finland
The N of landfill yard
2O discharges flux ratio northern farmland, Europe and high 1～2 order of magnitude (the Rinne J. of forest maximum, Pihlatie M., Lohila A., et al., Nitrous Oxide Emissions from a Municipal Landfill.Environ.Sci.Technol, 2005,39 (20) 7790～7793.).To same refuse landfill greenhouse gases N
2O and CH
4Between carry out CO
2Equivalent conversion shows that latter's proportion is at (Houhu Zhang, Pinjing He, Liming Shao.N more than 95%
2O emissions at municipal solid wastelandfills:effect of CH
4Emisions and cover soil.Atmospheric Environment.In Press; Doi10.1016/j.atmosenv.2009.02.011.), thus the demonstration control of refuse landfill greenhouse gases focus on controlling CH
4Release.
Landfill gas active collection system can effectively reduce cover surface CH
4Burst size, the oxidation of soil is indispensable replenishes in the landfill yard end cover layer.Methane gas that landfill waste produces is oxidized under the effect methane-oxidizing bacteria in the process of landfill yard end cover layer migration, wherein about 70% CH
4Carbon source enters living beings, and remainder is converted into CO
2As seen, tectal methane oxidation effect can reduce the discharge of methane amount of landfill yard.In some cases, the CH that not only can the complete oxidation landfill yard self be discharged of landfill yard overburden layer
4, even the CH in all right oxidation consumption atmosphere
4Overburden layer CH
4One of key element of oxidability depends on the permeability of soil, also is O
2Availability.
In addition, there are hundreds of seat health and accurate health household refuse landfill sites and general stockyard in current China, has inserted or several ten million tons of heap garbages.House refuse is in that ((generally at least more than 8～10 years, northern area is more than 10～15 years in Shanghai) can stabilisation and form mineralized waste after the landfill yard landfill several years.Mineralized waste not only has loose structure, waterpower conduction preferably and permeance property, cation exchange capacity (CEC) etc. preferably, and it is huge to exist quantity, of a great variety, microorganism based on multistage degradability microorganism, therefore be the very superior Biomedia of a kind of performance, be suitable as a kind of good filler or medium fully, and have other media (as soil) incomparable superior function (Zhao Youcai, Chai Xiaoli, Niu Dongjie. the research of mineralized waste fundamental characteristics. Tongji University's journal (natural science edition), 2006,34 (10): 1360-1364.).People such as Barlaz are relevant to studies show that mineralized waste is to CH
4Oxidability be better than clay (Barlaz, M.A., Green, R.B., Chanton, J.P., Glodsmith, C.D., Hater, G.R., 2004.Evaluation of a biological active cover for mitigation of landfill gas emissions.Environmental Science ﹠amp; Technology 38,4891-4899.).But mineralized waste is unfavorable for the growth of plant, is unable to undergo rainwash, for this reason, comparatively reasonably is as tectal intermediate layer, the CH that oxidation is escaped
4, save soil resource.
The Chinese national economy fast development, living standards of the people significantly improve, the sharp increase of solid waste quantity.Statistics shows that the annual production of China's house refuse has at present reached 1.5 hundred million tons, and refuse production and increases progressively in the growth rate with annual 8～9% about 1.0kg/d per capita.The landfill disposal house refuse is China's main processing mode at present, accounts for and handles more than 80% of total amount.For this reason, construct rational refuse landfill cover layer control greenhouse gases (CH
4) burst size, for the discharging significance that reduces China's greenhouse gases, this also is the responsibility that China should bear as " Kyodo Protocol " signatories to a treaty.
Description of drawings:
Fig. 1 is the profile of the mineralized waste-soil cover of design
Fig. 2 is the profile according to the mineralized waste-soil cover of implementation method example one design
Fig. 3 is the profile according to the mineralized waste-soil cover of implementation method example two designs
Summary of the invention
The objective of the invention is to utilize the characteristic of soil and mineralized waste, form refuse landfill intermediate cover layer control CH that landfill waste produces by optimum organization
4Discharging.
The objective of the invention is that (Fig. 1) and measure by the following technical programs reach.
A kind of mineralized waste control greenhouse gas of household garbage landfill site CH that utilizes of the present invention
4The intermediate cover layer structure that discharges, it is characterized in that selecting soil types and plant classification, concrete steps are as follows: adopt the clayed soil layer covering rubbish of filling out of permeability difference to play the parcel function earlier, serve as the antiseepage effect simultaneously, (house refuse Sanitary Landfill Technology standard: CJJ 17-2004), its antiseepage coefficient should be greater than 1.0 * 10 according to China's industry standard
-7Cm/s, thickness is greater than 30cm.The CH that rubbish is produced
4Can prevent invasions such as rainfall snow-broth simultaneously to greatest extent by the collected utilization of gas gathering system.
And then covering the mineralized waste layer, thickness should be more than or equal to 30cm.The mineralized waste of selecting for use is: the excavation rubbish that household refuse landfill sites landfill closing 10-15 is above is that via hole diameter is a fines under the sieve of rotary screen screening of 40mm, and the equal shape of fine fraction is like soil class material, and particle is more even.
The final grittiness soil horizon that covers, thickness should utilize the good characteristic of its permeability more than or equal to 30cm, and oxidation is not collected the CH of escape once more
4Gas.The sand loam soil of selecting should possess following feature: acid (pH=4～6) and barren, the content of organic matter are lower than＜2.5%, organic carbon content be lower than 1% and total N content in 0.2%.The activity that acid ground can suppress ammonia oxidation bacteria reduces N
2The burst size of O; And lean soil is to N
2The generative capacity of O is low.
The effect explanation
By reaching 18 months field monitoring, test landfill yard intermediate cover layer section CH simultaneously
4Gas concentration distributes and the surface discharges flux.The result shows: to 15cm, the soil gas methane concentration reduces up to 67.3-94.9vol% from 60cm under the soil.By comparing, be not difficult to find refuse landfill CH of the present invention with external data
4Discharge flux annual mean low (seeing Table 1), wherein than Finland
Refuse landfill and U.S. Leon refuse landfill are hanged down one 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
Specific implementation method:
Now 2 kinds of specific implementation methods of the present invention briefly are described below:
Embodiment one: the final covering of household refuse landfill sites at first adopts the argillic horizon of 30cm to carry out; And then after covering selected mineralized waste 30cm, covering grittiness soil horizon 30cm at last, details are seen Fig. 2.
Embodiment two: the final covering of household refuse landfill sites at first adopts the argillic horizon of 40cm to cover; After covering selected mineralized waste 40cm then, cover grittiness soil horizon 30cm at last, details are seen Fig. 3.
Advantage of the present invention:
The invention has the advantages that the handling problems that has considered refuse landfill two big accessory substances: the regeneration of mineralized waste and landfill yard greenhouse gases CH4The reduction of discharging that discharges. By the end cover layer that Different Soil and mineralized waste form, realized that the control of greenhouse gases discharges by structure.
Secondly, selected materials all can gather materials on the spot, with low cost, effect is remarkable, be fit to the current national conditions of China, thereby have bigger application value.
Claims (4)
1. one kind is utilized mineralized waste structure control refuse landfill CH
4The cover layer that discharges is characterized in that the intermediate cover layer that is composited by Different Soil and mineralized waste by structure realizing that the control of landfill yard greenhouse gases discharges.
2. one kind is utilized mineralized waste structure control refuse landfill CH
4The cover layer that discharges is characterized in that the mineralized waste of selecting for use is close an excavation rubbish more than 10～15 years of household refuse landfill sites landfill, is that via hole diameter is a fines under the sieve of rotary screen screening of 50-200mm, and shape is like last earth class material, and particle is more even.
3. one kind is utilized mineralized waste structure control refuse landfill CH
4The cover layer that discharges, it is characterized in that adopting earlier the viscous soil horizon that permeability is poor, infiltration coefficient is low (＞30cm) cover the rubbish of filling out to play physics parcel function, make CH that landfill waste produces
4Can farthest be recycled by the landfill gas gathering system; And then after covering the mineralized waste layer (〉=30cm), adopt sandy soil layer do intermediate cover layer (〉=30cm), utilize mineralized waste and the good advantage of sandy soil permeability, thereby oxidation is not collected the CH of escape
4Gas.
4. one kind is utilized mineralized waste structure control refuse landfill CH
4The cover layer that discharges is characterized in that the sand loam soil that utilizes topsoil to select should possess following feature: acid (pH=4～6) and barren, the content of organic matter are lower than＜2.5%, organic carbon content be lower than 1% and total N content in 0.2%.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100279606A CN101884995A (en) | 2009-05-14 | 2009-05-14 | Covering layer for controlling CH4 release in refuse landfill by using aged refuse |
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|---|---|---|---|
| CN2009100279606A CN101884995A (en) | 2009-05-14 | 2009-05-14 | Covering layer for controlling CH4 release in refuse landfill by using aged refuse |
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| CN101884995A true CN101884995A (en) | 2010-11-17 |
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|---|---|---|---|
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102826732A (en) * | 2012-08-28 | 2012-12-19 | 清华大学 | Landfill methane depth control technology based on dissimilatory iron reduction |
| CN104324925A (en) * | 2014-09-09 | 2015-02-04 | 中国科学院南京土壤研究所 | Domestic garbage landfill final cover system |
| CN105642642A (en) * | 2016-01-27 | 2016-06-08 | 辽宁工程技术大学 | Composite sealing cover structure of sulfide-contained mine solid waste landfill field |
| 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 |
| CN106424075A (en) * | 2016-12-08 | 2017-02-22 | 深圳市中兰环保科技股份有限公司 | Novel coverage system for in-situ treatment of aerobic repair landfilling gas of landfill |
| CN110000184A (en) * | 2019-04-15 | 2019-07-12 | 浙江理工大学 | A kind of material and preparation method thereof for household refuse landfill sites intermediate cover layer |
-
2009
- 2009-05-14 CN CN2009100279606A patent/CN101884995A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102826732A (en) * | 2012-08-28 | 2012-12-19 | 清华大学 | Landfill methane depth control technology based on dissimilatory iron reduction |
| CN104324925A (en) * | 2014-09-09 | 2015-02-04 | 中国科学院南京土壤研究所 | Domestic garbage landfill final cover system |
| CN105642642A (en) * | 2016-01-27 | 2016-06-08 | 辽宁工程技术大学 | Composite sealing cover structure of sulfide-contained mine solid waste landfill field |
| CN105642642B (en) * | 2016-01-27 | 2018-03-06 | 辽宁工程技术大学 | A kind of composite closure structure of the Mine Solid Wastes landfill field of sulfur compound |
| 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 |
| CN106424075A (en) * | 2016-12-08 | 2017-02-22 | 深圳市中兰环保科技股份有限公司 | Novel coverage system for in-situ treatment of aerobic repair landfilling gas of 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 |
| CN110000184A (en) * | 2019-04-15 | 2019-07-12 | 浙江理工大学 | A kind of material and preparation method thereof for household refuse landfill sites intermediate cover layer |
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Application publication date: 20101117 |