China has over seven million biogas pits in operation. They act as a combination waste disposal, recycling center, and fertilizer production while providing a high quality fuel for cooking, lighting, and power. One cu. meter of biogas will light a 60-100 watt bulb for 6 hours, cook 3 meals for a family of 6, generate 1.25 kW of electricity, run a 3-ton truck for 2.8 km, or a 1 HP motor for 2 hours. Complete details for making a bio-gas system in a variety of situations and soil types.
A Chinese Biogas Manual 
China has over seven million biogas pits in operation. They act as a combination waste disposal, recycling center, and fertilizer production while providing a high quality fuel for cooking, lighting, and power. One cu. meter of biogas will light a 60-100 watt bulb for 6 hours, cook 3 meals for a family of 6, generate 1.25 kW of electricity, run a 3-ton truck for 2.8 km, or a 1 HP motor for 2 hours. Complete details for making a bio-gas system in a variety of situations and soil types.