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Gas permeability and emission in unsaturated vegetated landfill cover with biochar addition

biochar 2023年第1期5卷 815-829页

作者： Junjun Ni Jingsong Zhou Yuchen Wang Haowen Guo School of Transportation Southeast UniversityNanjingChina Department of Civil and Environmental Engineering The Hong Kong University of Science and TechnologyHong Kong SARChina

plant-biochar interaction has been recognized to affect the hydraulic properties of landfill cover soils,while its influence on landfill gas emission is rarely *** study investigated the coupled effects of biochar and vegetation on gas permeability and emission in unsaturated landfill cover through an integrated theoretical modelling and laboratory ***,a gas permeability model was developed for vegetated coarse-grained soils with biochar ***,a well-instrumented laboratory column test and two tests from the literature,considering bare,grass,biochar and grass+biochar conditions,were used for model ***,a numerical parametric study was conducted to investigate the influence of root growth and drought conditions on the gas emission *** showed that the developed model can satisfactorily capture the gas permeability of unsaturated soils at various degrees of *** lowest water retention capacity,the highest gas permeability and gas emission rate after 24 months of growth were observed in the grassed ***,adding biochar in vegetated soils can maximize the water retention capacity and decrease the gas permeability,resulting in the lowest gas emission *** measured gas emission rates for the four cases meet the recommended value by the design *** parametric study showed that the increased root depth from 0.2 m to 0.4 m improved the gas emission rate by 170%in the grass case but decreased by 97%in the grass+biochar *** the severe drought condition with soil suction around 500 kPa,the gas emission rate in the grassed case exceeded the design value by 18%,while those in the biochar cases were far below the allowable ***,peanut shell biochar should be considered to amend the grassed landfill cover using coarse-grained soils as it can significantly improve engineering performance in reducing gas emissions under extreme drought conditions.

关键词： plant-biochar interaction Gas permeability model Gas emission Numerical simulation

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