Usually, the biomethane generation rate of digester is 0.2-0.25 m3/(m3.d). So annual output of a 10 m3 digester is about 600 m3 biomethane. Usually, heat value of 1 m3 biomethanol is equivalent to that of 3.3 kg raw coal. As mentioned in previous, annual consumption of biomethane reached 5 million standard coal equivalent in China. It is obvious that biomethane plays an important role in rural energy supply.

Further information

http://www. cogeneration. net/BioMethanation. htm

Wang Haibo, Yang Zhanjiang, Geng Yeqiang. Analysis on the influence factors of rural household biogas production in China. Renewable Energy Resources, Vol. 25 No.5 Oct. 2007: 106-109 http://www. biogas. cn/

Gao Yunchao, Kuang Zheshi, etc. Development progress and current situation analysis of the rural household biogas in China, Guangdong Agricultural Sciences, 2006. 1: 22-27 Huang Fenglian, Zheng Xiaohong, etc. Actions and modes of household biogas for new rural area construction in China. Guangdong Agricultural Sciences, 2007. 8: 114-116