title: An analytical model for estimating the reduction of methane emission through landfill cover soils by methane oxidation.
abstract: Landfill is an important source of atmospheric methane (CH4). In this study, the development and partial validation are presented for an analytical model for predicting the reduction of CH4 emission in landfill cover soils by CH4 oxidation. The model combines an analytic solution of a coupled oxygen (O2) and CH4 soil gas transport in landfill covers with a piecewise first-order aerobic biodegradation, including the influences of environmental factors such as cover soil thickness, CH4 oxidation and CH4 production rate. Comparison of soil gas concentration profiles with a soil column experiment is provided for a partial validation, and then this model is applied to predict the reduction of CH4 emission through landfill covers in several other cases. A discussion is provided to illustrate the roles of soil layer thickness, reaction rate constant for CH4 oxidation and CH4 production rate in determining CH4 emissions. The results suggest that the increase of cover soil thickness cannot always increase CH4 oxidation rates or removal efficiency, which becomes constant if the thickness of landfill cover soil is larger than a limit.
authors.affiliation: MOE Key Lab of Environmental Remediation and Ecosystem Health, College of Environmental and Resource Sciences, Zhejiang University, Hangzhou 310058, China; Research Center for Air Pollution and Health, Zhejiang University, Hangzhou 310058, China; Institute of Environmental Science, Zhejiang University, Hangzhou 310058, China.
authors.forename: Yijun
authors.initials: Y
authors.lastname: Yao
authors.affiliation: Department of Environmental Engineering, Zhejiang University, Hangzhou 310058, China.
authors.forename: Yao
authors.initials: Y
authors.lastname: Su
authors.affiliation: MOE Key Lab of Environmental Remediation and Ecosystem Health, College of Environmental and Resource Sciences, Zhejiang University, Hangzhou 310058, China; Research Center for Air Pollution and Health, Zhejiang University, Hangzhou 310058, China; Institute of Environmental Science, Zhejiang University, Hangzhou 310058, China.
authors.forename: Yun
authors.initials: Y
authors.lastname: Wu
authors.affiliation: MOE Key Lab of Environmental Remediation and Ecosystem Health, College of Environmental and Resource Sciences, Zhejiang University, Hangzhou 310058, China; Research Center for Air Pollution and Health, Zhejiang University, Hangzhou 310058, China; Institute of Environmental Science, Zhejiang University, Hangzhou 310058, China.
authors.forename: Weiping
authors.initials: W
authors.lastname: Liu
authors.affiliation: Department of Environmental Engineering, Zhejiang University, Hangzhou 310058, China. Electronic address: heruo@zju.edu.cn.
authors.forename: Ruo
authors.initials: R
authors.lastname: He
mesh_terms: D000393:Air Pollutants / Q000032:analysis*; D001673:Biodegradation, Environmental; D008697:Methane / Q000032:analysis*; D008956:Models, Chemical; D010084:Oxidation-Reduction; D012987:Soil / Q000737:chemistry*; D012988:Soil Microbiology; D064091:Waste Disposal Facilities
chemical_list: D000393:Air Pollutants; D012987:Soil; D008697:Methane
keywords: Analytical model; First-order biodegradation; Landfills; Methane oxidation