title: Dynamics of CH4 oxidation in landfill biocover soil: effect of O2/CH4 ratio on CH4 metabolism.
abstract: The CH(4) oxidation dynamics was investigated by observing the CH(4) oxidation rates at concentrations (from 1.0 × 10(4) ppmv to 2.0 × 10(5) ppmv) mixed with O(2) (from 5.0 × 10(4) ppmv to 7.5 × 10(5) ppmv). The CH(4)-O(2) dual-substrate model based on Michaelis-Menten equation (K(m, CH4) = 1.4 × 10(5) ppmv; V(max) = 7.6 × 10(2) μmol kg(-1) d(-1); K(m, O2) = 5.5 × 10(4) ppmv) was got and agreed well with the experimental data when the initial O(2)/CH(4) ratio reached 3:1, indicating full aerobic CH(4) oxidization. Anoxic CH(4) oxidation gradually became predominant with decreasing O(2)/CH(4) ratios. The effect of CH(4) is more significant than O(2), as evidenced by higher slope (0.58 kg(-1) d(-1)) of V(CH4) - [S(CH4)] line graph compared with that of V(CH4) - [S(CH4)] line graph (0.062 kg(-1) d(-1)). The paper presents the dynamics of CH(4) oxidation and proposes that ratio of O(2)/CH(4) need to be considered for their dynamically changing in environmental habitats. The findings provide an important parameter for optimizing the operations of breathing biocover systems.
authors: College of Environment and Resources, Jilin University, Changchun 130021, China.
authors: Zi-Fang
authors: ZF
authors: Chi
authors: Wen-Jing
authors: WJ
authors: Lu
authors: Huai
authors: H
authors: Li
authors: Hong-Tao
authors: HT
authors: Wang
mesh_terms: D000393:Air Pollutants / Q000032:analysis / Q000378:metabolism*; D000397:Air Pollution / Q000517:prevention & control / Q000706:statistics & numerical data; D057919:Biological Oxygen Demand Analysis; D008697:Methane / Q000032:analysis / Q000378:metabolism*; D008956:Models, Chemical; D010100:Oxygen / Q000032:analysis / Q000378:metabolism; D012037:Refuse Disposal / Q000379:methods*; D012987:Soil / Q000737:chemistry; D012988:Soil Microbiology
chemical_list: D000393:Air Pollutants; D012987:Soil; D008697:Methane; D010100:Oxygen