Biogas is a mixture of combustible gases, which are formed by the decomposition of organic substances in wet and lack of oxygen. Component of biogas is methane. The first descriptions of biogazuluisunt made by Volta in the late seventeenth century. Volta first methane extracted from swamp gas. The process of formation of biogas, anaerobic digestion takes place at temperatures between 20-45 ° C in the presence of two species of bacteria Bacillus cellulosae methanicus responsible for methane formation, and Bacillus cellulosae hidrogenicus responsible for the formation of hydrogen.
