A 600-gallon biogas generator in Oregon turns 15 pounds of food waste into cooking fuel daily.As food and yard waste decompose, methane and carbon dioxide are created, inflating the rubber bladder to create the pressure necessary to supply a gas burner.
![]() Create Biogas Generator In OregonFind out more at HestiaHomeBiogas.com. Photo by Isaac Marquez. This methane-producing biogas generator is located at Maitreya Ecovillage in Oregon. The biogas generator turns 15 pounds of the communitys kitchen scraps and garden waste into a days worth of cooking fuel for the community kitchen. Organic materials mixed into a slurry and put in an airtight container produce combustible gases that can be used for cooking and heating, along with nitrogen-rich liquids and compostable solids (collectively known as digestate) perfect for fertilizing a garden or farm fields. The author set up a chopping station in his garden using an old sink and garbage disposal attached to an extension cord. Freshly cut grass clippings can produce about 112 cubic feet of biogas per pound. One cow will produce about 140 pounds (18 gallons) of manure each day, which could ultimately generate, on average, 85 cubic feet of biogas, or about three hours of daily cooking fuel. Illustration courtesy Bavarian Association for the Promotion of Solar Energy. ![]() A biogas plant in Germany captures methane from a landfill to produce electricity. According to the U.S. Environmental Protection Agency, about 600 U.S. This gas, known as biogas, can also replace fossil-based natural gas to fuel an engine or an absorption cooling system, such as a gas refrigerator or chiller. Some gasoline engines are designed for or can be modified for use with natural gas, propane or biogas. By constructing a home biogas generator, you can make enough fuel to at least provide your cooking energy. A family with modest daily cooking needs will at a minimum require the output of a warm, well-fed, 200-gallon (27-cubic-foot) generator. This much biogas will allow for about one hour of daily stovetop cooking. Start small to develop an understanding of biogas by making a small generator from a single 55-gallon barrel. Anywhere from 10 to 60 percent of the solids will convert into biogas during digestion, so expect between 3 and 18 cubic feet of available biogas energy for each pound of dry material. Methane (chemically known as CH4) is the primary component of conventional natural gas, commonly used for cooking and heating, although biogas is not as energy-dense. The methane content of biogas will probably range from 50 to 80 percent, compared with about 70 to 90 percent in utility-supplied natural gas.
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