Abstract
Biogas contains about 65% methane, 30-35% carbon dioxide, traces of hydrogen sulphide and moisture. It has been observed that diesel engines get severely damaged when operated on biogas for long duration. Presence of these corrosive gases make biogas unsuitable for transportation application. By removing CO2 and trace acidic gases like H2S and moisture, biogas can be converted into natural gas (which is mainly methane). Natural gas is a more environment friendly and its usage leads to lower engine wear. CO2 and H2S can be removed successfully from biogas using suitable scrubber techniques. Remaining methane gas (natural gas) can be compressed to high pressures of the order of 240 bar using multistage compression and CNG cylinders can be filled. This bottled gas can be used to operate automobiles by suitable modifications in the induction system of the engines. This fuel gas derived from biogas is a good engine fuel. [Received: February 21, 2009; Accepted: June 11, 2009]
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