Abstract：In order to explore the external environment and favorable conditions for microbial efficient degradation methane, and to improve and prefect the fundamental coal mine gas methods by microbial methods, the experimental device of microbial degradation for adsorption methane of granular coal was independently developed. The degradation efficiency of Methylomarinum genus for adsorption methane was studied under different oxygen concentrations and methane pressures, at the same time these experiment groups of granular coal had different Protodyakonov's coefficients. The results showed that within 24 hours, the degradation efficiency increased slowly in the first 5 hours, and then increased linearly, finally tended to be a constant value after 20 hours because methane oxidizing bacteria had different metabolic mechanism under different oxygen volume fraction, the degradation rate was different in the same condition with similar coal classification, the greater the Protodyakonov's coefficient was, the higher the degradation rate would be. It was found that gas pressure of 1²MPa would increase degradation efficiency, and gas pressure of 5 MPa could inhibit methane degradation greatly.

Keyword：granular coal adsorption methane;methanotrophs;degradation rate;oxygen volume fraction;protodyakonov's coefficient;gas pressure;