gas produced from fermentation of organic material, e.g. sewage sludge, organic waste, etc., in rather small units often connected to waste water treatment plants, composed of 65% methane, and carbon dioxide and water; biogas is treated to increase the methane content to about 97%, which is the same as in natural gas; use of biogas for cars or heating gives rise to very small emissions
Gas generated by the anaerobic fermentation of organic matter (dung, plant residues, and so on). It consists of some 60â€“70% methane. As a renewable energy source, it can be used for heating, lighting and, with suitable adaptation, as fuel for internal combustion engines.
primarily composed of methane, biogas is a principal byproduct of anaerobic treatment that can be used as a fuel.