Diffusion process of biogas and evaluation of methane oxidation in landfill cover soil are important parts of research on methane emission. Diffusion process of oxygen in landfill cover soil was analyzed by simulation

and an oxygen diffusion model fitted by exponential equation (0.8941<R2<0.9975) was developed. Potential of methane oxidation in different landfill cover depths was also investigated by analyzing organic carbon and monitoring methane concentration. The most intensive methane oxidation occurred at the layer of 0.05—0.25 m. An oxygen consumption flux model in landfill cover was derived on the basis of Fick's law and axial dispersion model. There was no significant difference between fitted values by oxygen consumption flux model and derived values by empirical equation of biological methane oxidation. Based on the above model

a methane consumption flux model was derived finally

and the prediction was consistent with detection. These results provided new ideas and theoretical basis for revealing biogas diffusion process in landfill cover soil

intensifying methane oxidation capability and predicting methane emission.