Purification of Biogas:
Biogas being a mixture of methane, carbon (IV) oxide, hydrogen sulphide and trace amounts of water vapour needs purification if the gas is to be used as a fuel especial in internal combustion engines. This is because of the fact that of all the gases produced, only methane is combustible, carbon (IV) oxide and hydrogen sulphide actually reduce the fuel efficiency of the biogas and therefore need to be removed or significantly reduced to the bearest minimum. The hydrogen sulphide is known to be corrosive and can damage metal surface if present at high levels.