Method for converting brown coal into methane by utilizing microorganism

The invention relates to the field of coal conversion and utilization technology, and in particular relates to a method for converting brown coal into methane by utilizing microorganism, aiming at solving the technical problem that the existing technology used for converting the methane by utilizing the microorganism is low in gas production efficiency. The invention provides a method used for converting the coal into the methane after the exogenous microorganism is acclimatized. The main technical scheme is as follows: after gradual purification and acclimatization are carried out by adopting the activated sludge of a sewage treatment plant and the flora in biogas slurry and utilizing the coal dust with the particle size smaller than 0.075mm, the coal is converted into methane. The test proves that after the activated sludge of the sewage treatment plant and the flora in the biogas slurry are taken as original bacteria sources, and the brown coal is rapidly converted into the methane after gradual acclimatiz