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The consumption of fossil fuel is increasing day by day and is going to deplete soon. Biogas is a clean environment friendly fuel. Biogas produced in the digester from anaerobic digestion of organic waste cannot be used straight off as a fuel.The gases produced in the digester from anaerobic digestion are methane and trace components like carbondioxide, water vapour, hydrogen sulphide, siloxanes, Hydrocarbons, NH3 , O2 , CO and N2 .To use biogas as fuel, its calorific value should be about equal to calorific value of natural gas. Hence calorific value of biogas can be upgraded by removing carbon dioxideand trace components from biogas obtained from the digester. These gases are not completely combustible and will harm, living beings, engine parts and the monuments. Upgrading biogas, two steps are performed: (1) cleaning process to separate trace components of gases and (2) upgrading process to improve calorific value of biogas. This paper reviews the attempt made to upgrade calorific value of a biogas by using different methods for upgrading.
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