Semi-analytical Model for Methane Transport and Oxidation Through Landfill Compacted Clay Liner (CCL) Cover
Semi-analytical model for methane transport and oxidation through CCL cover was developed. Influence of gas diffusion coefficient and methane oxidation rate on the transport of methane and oxygen through CCL cover was investigated. Methane diffusion coefficient has great influence on methane transport through CCL cover but has no obvious influence on oxygen concentration profile. When t = 0.1 day, methane concentration for the case with Dm = 3.81 × 10−6 m2/s is 8 times greater than the case with Dm = 3.81 × 10−7 m2/s at depth z = 0.1 m. Oxygen concentration at the same depth increases with the increase of oxygen diffusion coefficient. Methane oxidation rate has great influence on methane transport through CCL cover but has on effect on oxygen transport through CCL cover. When t = 1 day, concentration of methane at z = 0.1 m for the case with k = 9.12 × 10−5 s−1 is approximately 40 times greater than the case with k = 9.12 × 10−4 s−1. It is also indicated that time needed to reach steady-state increases with the decrease of methane oxidation rate.
KeywordsLandfill Methane oxidation Semi-analytical model
The financial supports from the National Natural Science Foundation of China 501 (Grants Nos. 41672288, 51478427, 51625805, 51278452, and 51008274), the 502 Fundamental Research Funds for the Central Universities (Grant No. 2017QNA4028), 503 and Zhejiang Provincial Key Research Project (Grant No. 2015C03021) are gratefully 504 acknowledged.
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