生物炭改性填埋场覆盖层土的渗气特性研究

doi:10.13722/j.cnki.jrme.2022.0041

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Abstract Biochar has a porous structure，higher specific surface area and stronger adsorption characteristics. Adding biochar to the traditional clay cover of landfill，i.e.，biochar-amended clay cover，so as to achieve the purpose of biologically reducing the methane released from the landfill. Adding biochar could change the pore structure of the soil and improve the air mobility in the soil, but the mechanism of influence on the air flow characteristics of the landfill cover is not clear. Therefore，the air permeability characteristics of biochar-clay mixed soil were used as the main evaluation indicators to explore the influence law and mechanism of biochar content and particle size on the air permeability characteristics of biochar-clay mixed soil. The air permeability coefficient ka of biochar-clay mixed soil with different biochar contents and different biochar particle size groups was measured by using the self-developed flexible wall air permeability testing device，and the changes of pore size distribution are analyzed by nuclear magnetic resonance(NMR) technique. The research results show that for the biochar-clay mixed soil whose dry density is not less than 90% of the maximum dry density of clay，there was an optimal biochar content，and its air permeability coefficient is the lowest. When the content of biochar is less than the optimal value，the air permeability coefficient decreases with the increase of the content of biochar, and the trend is more obvious at lower dry density. When the biochar content was larger than the optimal value，the air permeability coefficient gradually increases with the increase of the content of biochar. Comparing the air permeability coefficient of biochar-clay mixed soil with different biochar particle size groups without overlap，the permeability coefficient decreases with the decreased of biochar particle size. The NMR microscopic test results were used to explain the change mechanism of the air permeability coefficient of biochar-clay mixed soil increasing with the increase of biochar content and particle size under specific conditions. This study can provide a reference for the selection of biochar dosage and particle size for the design and construction of the final cover layer of biochar-amended clay in landfills.

Key words： soil mechanics biochar-clay mixed soil content particle size air permeability nuclear magnetic resonance pore size distribution

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	LI Mingyu1
	SUN Wenjing2

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LI Mingyu1,SUN Wenjing2. Gas permeability characteristics of biochar-amended landfill cover soil [J]. , 2022, 41(S2): 3543-3550.

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http://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2022.0041 OR http://rockmech.whrsm.ac.cn/EN/Y2022/V41/IS2/3543

[27]	BLIGHT G E. Flow of air though soils[J]. Journal of Soil Mechanics and Foundations Div.，1971，97(SM4)：607–624.
[10]	JEFFERY S，VERHEIJEN F G A，VELDT M V D，et al. A quantitative review of the effects of biochar application to soils on crop productivity using meta-analysis[J]. Agriculture，Ecosystems and Environment，2011，144(1)：175–187.
[18]	王勇，孔令伟，郭爱国，等. 杭州地铁储气砂土的渗气性试验研究[J]. 岩土力学，2009，30(3)：815–819.(WANG Yong，KONG Lingwei，GUO Aiguo，et al. Experimental research on gas permeability of shallow gassy sand in Hangzhou Metro Project[J]. Rock and Soil Mechanics，2009，30(3)：815–819.(in Chinese))
[20]	AMOAKWAH E，FRIMPONG K A，OKAE-ANTI D，et al. Soil water retention，air flow and pore structure characteristics after corn cob biochar application to a tropical sandy loam[J]. Geoderma，2017，307：189–197.
[21]	SUN Z，MOLDRUP P，ELSGAARD L，et al. Direct and indirect short-term effects of biochar on physical characteristics of an arable sandy loam[J]. Soil Science，2013，178(9)：465–473.
[1]	IPCC(Intergovernmental Panel on Climate Change). Special report on renewable energy sources and climate change mitigation[M]. New York：Cambridge University Press，2007.
[2]	US-EPA(United States Environmental Protection Agency). Available and emerging technologies for reducing greenhouse air emissions from municipal solid waste landfills[S]. [S. l.]：Office of Air and Radiation U.S. EPA，2011.
[5]	OMIDI G H，THOMAS J C，BROWN K W. Effect of desiccation racking on the hydraulic conductivity of a compacted clay pollution liner[J]. Water, Air and Soil，1996，89(1/2)：91–103.
[7]	李金文，顾凯，唐朝生，等. 生物炭对土体物理化学性质影响的研究进展[J]. 浙江大学学报：工学版，2018，52(1)：193–206.(LI Jinwen，GU Kai，TANG Chaosheng，et al. Advances in defects of biochar on physical and chemical properties of soils[J]. Journal of Zhejiang University：Engineering Science，2018，52(1)：193–206.(in Chinese))
[12]	彭尔兴，孙文博，章定文，等. 非饱和含砂细粒土的气体渗透特性研究[J]. 岩土力学，2016，37(5)：1 301–1 307.(PENG Erxing，SUN Wenbo，ZHANG Dingwen，et al. Air permeability of unsaturated fine sandy soil[J]. Rock and Soil Mechanics，2016，37(5)：1 301–1 307.(in Chinese))
[13]	叶为民，王初生，王琼，等. 非饱和粘性土中气体渗透特征[J]. 工程地质学报，2009，17(2)：244–248.(YE Weimin，WANG Chusheng，WANG Qiong，et al. Laboratory tests on the characteristics of air- permeation in unsaturated shanghai soft soil[J]. Journal of Engineering Geology，2009，17(2)：244–248.(in Chinese))
[16]	姚志华，陈正汉，黄雪峰，等. 非饱和Q3黄土渗气特性试验研究[J]. 岩石力学与工程学报，2012，31(6)：1 264–1 273.(YAO Zhihua，CHEN Zhenghan，HUANG Xuefeng，et al. Experimental research on gas permeability of unsaturated Q3 loess[J]. Chinese Journal of Rock Mechanics and Engineering，2012，31(6)：1 264–1 273.(in Chinese))
[9]	LEHMANN J. Bio-energy in the black[J]. Frontiers in Ecology and the Environment，2007，5(7)：381–387.
[3]	陆海军，栾茂田，张金利，等. 垃圾填埋场封顶系统的设计与水分平衡[J]. 土木建筑与环境工程，2010，32(2)：108–113.(LU Haijun，LUAN Maotian，ZHANG Jinli，et al. Hydraulic balance and design of covering system in landfills[J]. Journal of Civil，Architectural and Environmental Engineering，2010，32(2)：108–113.(in Chinese))
[8]	刘秉岳，赵仲辉，涂欢欢，等. 生物炭改性填埋场覆盖粉土的甲烷氧化能力试验研究[J]. 科学技术与工程，2015，15(36)：99–104. (LIU Bingyue，ZHAO Zhonghui，TU Huanhuan，et al. Methane oxidation capacity of landfill cover biochar amended silt[J]. Science Technology and Engineering，2015，15(36)：99–104.(in Chinese))
[14]	LIU J F，SKOCZYLAS F，TALANDIER J. Gas permeability of a compacted bentonite-sand mixture：coupled effects of water content，dry density，and confining pressure[J]. Canadian Geotechnical Journal，2015，52(8)：1 159–1 167.
[19]	OGUNTUNDE P G，ABIODUN B J，AJAYI A E，et al. Effects of charcoal production on soil physical properties in Ghana[J]. Journal of Plant Nutrition and Soil Science，2008，171(4)：591–596.
[25]	DELAGE P，CUI Y J，DE L E. Air flow through an unsaturated compacted silt[C]// Proceedings of the 2nd International Conference on Unsaturated Soils UNSAT. [S. l.]：[s. n.]，1998：563–568.
[30]	YAGHOUBI P. Development of biochar-amended landfill cover for landfill gas mitigation[Ph. D. Thesis][D]. Chicago：University of Illinois at Chicago，2011.
[23]	GARG A，BORDOLOI S，NI J，et al. Influence of biochar addition on gas permeability in unsaturated soil[J]. Géotechnique Letters，2019，9(1)：66–71.
[24]	ATINSON C J，FITZGERALD J D，HIPPS N A. Potential mechanisms for achieving agricultural benefits from biochar application to temperate soils：a review[J]. Plant and Soil，2010，337(1/2)：1–18.
[29]	AEGER F，BOWE S，VANAS H，et al. Evaluation of 1H NMR relaxometry for the assessment of pore-size distribution in soil samples[J]. European Journal of Soil Science，2009，60(6)：1 052–1 064.
[6]	WONG J T F，CHEN Z，NG C W W，et al. Gas permeability of biochar-amended clay：potential alternative landfill final cover material[J]. Environmental Science and Pollution Research，2016，23(8)：7 126–7 131.
[17]	袁俊平，张锋，王启贵，等. 裂隙对压实膨胀土渗气性影响试验[J]. 水利水电科技进展，2014，34(3)：34–38.(YUAN Junping，ZHANG Feng，WANG Qigui，et al. The influences of fissure on gas permeability of the compacted expansive soil[J]. Advances in Science and Technology of Water Resources，2014，34(3)：34–38.(in Chinese))
[28]	WANG Y J，CUI Y J，TANG A M，et al. Effects of aggregate size on the compressibility and air permeability of lime-treated fine-grained soil[J]. Engineering Geology，2017，228：167–172.
[4]	詹良通，刘伟，陈云敏，等. 某简易垃圾填埋场渗滤液在场底天然土层迁移模拟与长期预测[J]. 环境科学学报，2011，31(8)：1 714– 1 723.(ZHAN Liangtong，LIU Wei，CHEN Yunmin，et al. Numerical simulation and prediction of migration of leachate into natural soil strata under a simple MSW dump[J]. Acta Scientiae Circumstantiae，2011，31(8)：1 714–1 723.(in Chinese))
[15]	刘奉银，张昭，周冬. 湿度和密度双变化条件下的非饱和黄土渗气渗水函数[J]. 岩石力学与工程学报，2010，29(9)：1 907–1 914. (LIU Fengyin，ZHANG Zhao，ZHOU Dong. Density-saturation- dependent air-water permeability function of unsaturated loess[J]. Chinese Journal of Rock Mechanics and Engineering，2010，29(9)：1 907–1 914.(in Chinese))
[26]	YOSHIMI Y，OSTERBERG J O. Compression of partially saturated cohesive soils[J]. Journal of Soil Mechanics and Foundations Division Proceedings of the American Society of Civil Engineers，1963，89(4)：1–24.
[11]	袁帅，赵立欣，孟海波，等. 生物炭主要类型、理化性质及其研究展望[J]. 植物营养与肥料学报，2016，22(5)：1 402–1 417. (YUAN Shuai，ZHAO Lixin，MENG Haibo，et al. The main types of biochar and their properties and expectative researches[J]. Journal of Plant Nutrition and Fertilizer，2016，22(5)：1 402–1 417.(in Chinese))
[22]	COATES G R，XIAO L L，PRAMMER M G. NMR Logging principles and application[M]. Houston：Halliburton Energy Services Publication，1999.
[31]	TIAN H H，WEI C F，LAI Y M，et al. Quantification of water content during freeze-thaw cycles：a nuclear magnetic resonance based method[J]. Vadose Zone Journal，2018，17(1)：1–12.