title: Evaluation of methane oxidation activity in waste biocover soil during landfill stabilization.
abstract: Biocover soil has been demonstrated to have high CH(4) oxidation capacity and is considered as a good alternative cover material to mitigate CH(4) emission from landfills, yet the response of CH(4) oxidation activity of biocover soils to the variation of CH(4) loading during landfill stabilization is poorly understood. Compared with a landfill cover soil (LCS) collected from Hangzhou Tianziling landfill cell, the development of CH(4) oxidation activity of waste biocover soil (WBS) was investigated using simulated landfill systems in this study. Although a fluctuation of influent CH(4) flux occurred during landfill stabilization, the WBS covers showed a high CH(4) removal efficiency of 94-96% during the entire experiment. In the LCS covers, the CH(4) removal efficiencies varied with the fluctuation of CH(4) influent flux, even negative ones occurred due to the storage of CH(4) in the soil porosities after the high CH(4) influent flux of ~137 gm(-2) d(-1). The lower concentrations of O(2) and CH(4) as well as the higher concentration of CO(2) were observed in the WBS covers than those in the LCS covers. The highest CH(4) oxidation rates of the two types of soil covers both occurred in the bottom layer (20-30 cm). Compared to the LCS, the WBS showed higher CH(4) oxidation activity and methane monooxygenase activity over the course of the experiment. Overall, this study indicated the WBS worked well for the fluctuation of CH(4) influent flux during landfill stabilization.
authors: Department of Environmental Engineering, Zhejiang University, Hangzhou 310058, China. heruo@zju.edu.cn
authors: Ruo
authors: R
authors: He
authors: Jing
authors: J
authors: Wang
authors: Fang-Fang
authors: FF
authors: Xia
authors: Li-Juan
authors: LJ
authors: Mao
authors: Dong-Sheng
authors: DS
authors: Shen
mesh_terms: D001673:Biodegradation, Environmental; D005740:Gases / Q000737:chemistry; D008697:Methane / Q000737:chemistry / Q000378:metabolism*; D010084:Oxidation-Reduction; D010105:Oxygenases / Q000378:metabolism; D016062:Porosity; D012037:Refuse Disposal; D012987:Soil; D012988:Soil Microbiology
chemical_list: D005740:Gases; D012987:Soil; D010105:Oxygenases; C021555:methane monooxygenase; D008697:Methane