I came across an article on how biomethane from various organic wastes is being tapped on the local scale in rural China and on the municipal scale in Beijing.

Beginning in 2000, the Agricultural Ministry of China has fostered sustainable development by promoting integrated biogas technologies with the goals of protecting ecology and the environment while also increasing farmers’ income. Full-scale projects have been implemented in over 1000 rural counties.

Construction is based on the family unit and is coupled with educational guidance on how to eliminate inefficient crop production practices, and to effectively utilize land, solar energy and biological resources. Rural methane power generation is the most significant piece of this energy-revolution program.

Structural improvements to toilets and animal sheds allow for the collection of human and animal wastes, rice straw and daily trash which serves as the raw material to generate methane. Methane ranges and cook stoves, heating and lighting fixtures powered by home-grown methane do not emit smoke and dust, thus eliminating health hazards often associated with burning raw waste materials or coal.

The liquid and solid remains after the fuel is siphoned off serves as fertilizer to enrich the soil, prevent plant diseases and control pests. Completing the natural cycle by returning materials to the earth in this way increases crop production and eliminates costs of fertilizers and pesticides. It also helps to build the rural economy.

Methane power generation has also been extended into cities in China. Methane is now being collected from the Asuwei Landfill in the Changping District of Beijing and used to generate power. This is the first city landfill methane in Northern China. Not only is it generating useful electricity, it is helping to eliminate odor problems and resolving safety concerns posed by methane emissions from decomposing organic wastes. While improving the environment in surrounding areas, this project is also providing enough electrical power to serve 17,000 families for one year in Beijing!