Technology for preparing biogas through methane

A technology for preparing biogas through methane mainly comprises the steps as follows: raw material treatment, anaerobic fermentation, desulfurization, water washing, decarbonation, dewatering and storage, wherein a desulfurizing agent is added into an anaerobic fermentation tank while the anaerobic fermentation is conducted, so that the fermentation and the desulfurization are conducted simultaneously, a separate desulfurization device is omitted, and the cost is saved; in addition, a first storage tank and a second storage tank are arranged, and the second storage tank transports gases to the first storage tank according to pressure changes of the first storage tank. With the adoption of the technology for preparing the biogas through the methane, the technical problems that the anaerobic fermentation is low in gas production rate and unstable in gas supply quality are solved.