Abstract

This paper reviews the advancements in the area of renewable energy production from animal and organic wastes. Liquefied petroleum gas, which is the major cooking fuel around the globe has become costly and un-affordable to common public, with the shedding of subsidies by Government. In this context bio-gas production has gained much relevance. The paper discusses the advancement in the microbiology of bio-methanisation, advances in the digester designs and bio-gas purification. The technologies to remove carbon dioxide, hydrogen sulphide and moisture have been reviewed. Future technologies like bio-gas compression, bottling and vehicles running on biogas, which is yet to be commercialised are also discussed.

Keywords : bio-gas, bio-methanisation, scrubbing, bio-gas purification, compression