A bench-scale investigation was conducted to evaluate the dynamics of methanogenic activities in a landfill bioreactor (LFBR) treating the organic fraction of municipal solid wastes (OFMSW). The specific methanogenic activity (SMA) test was used to measure each individual methanogenic activity on degrading carbohydrate, protein, lipid, butyrate, propionate, and acetate at an interval of one-year. A simple model incorporating three biokinetic parameters, namely lag-phase time, methane production rate and methane production potential, was employed to systematically describe the dynamics of SMA on the anaerobic mineralization of the OFMSW in an LFBR. The results indicate that the model is suitable to describe the dynamics of SMA in the LFBR. According to the dynamics of the SMA, the decomposition of proteins and lipids overruled the stabilization of the LFBR, while the rate of methanogenesis was higher than that of acetogenesis. Comparing the estimation and the observation of methane production rates suggested that the period of the critical incubation time (λ*) of the protein and the lipid influenced the efficiency of the LFBR.

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