The term biogases refer to gases created by the anaerobic fermentation of biological materials. Their main constituents are methane and carbon dioxide. Considerable quantities of biogases are produced by anaerobic fermentation of agricultural and organic waste (biogas), sludge digestion in the tanks of sewage treatment plants (sewage gas) and organic residues in garbage tips (land fill gas). Biogas can be utilized for electricity production, cooking, space heating and process heating. If compressed, it can replace compressed natural gas for use in vehicles, where it can fuel cell. Compressed bio-gas is becoming widely used in Sweden, Switzerland and Germany. A bio-gas powered train has been in service in Sweden. In India also compressed biogas is used in bus and car to save environment from pollution. The demand of compressed bio-gas is increasing very rapidly, so there is wide scope for new entrepreneurs to venture into this project.
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