Biogas Sweetening and Upgradation by Removal of Non Combustible Gases and Enrichment of Methane-A Critique

Biogas generated from the biomethanation process contains about 50 to 65 percent of methane, carbon dioxide, hydrogen sulphide, water vapour and traces of ammonia. A continuous counter-current type scrubberwitha biogasflow rateof 1.8 m³/h at0.48 bar pressure and water inflow rate of 0.465 m³/h. It continuously reduced CO₂ from 30% at inlet to 2% at outlet by volume. Water scrubbing system provides 100 percent pure methane is dependent on factors like dimensions of scrubbing tower, gas pressure, composition of raw biogas, water flow rates andpurity ofwater used. A packedbed type scrubbing system using the locally available packing materials is capable of reducing 30 to 40 percent more CO₂ by volume when compared with the scrubbers without a packed bed. 100% pure methane but was dependent on the calorific value of raw biogas is much lower than CNG or LNG. Biogas is used for electricity and heating applications, its purification of biogas is to remove hydrogen sulphide and water, which negatively affects the functioning and viability of power equipment, causing them to corrode.