Biogas, Anaerobic Bacterial, Hydrogen, Methane, Gas Turbines, Pipeline

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	Biogas - Biogas is the mixture of gases (about 60% methane) produced by anaerobic bacterial digestion of organic matter. Biogas consists mainly of methane (CH4; Ca. 60%) and CO2 (Ca. 40%) plus traces of hydrogen (Hz) and several other gases. Biogas may be used in the following three ways: (i) direct combustion, (ii) generation of electricity and (iii) purification and export as compressed gas or in liquid form.
Use of gas for direct combustion close to the site of production is the most economical. It may be used to heat green houses, boilers, furnaces, fire brick or cement kilns, for household work like cooking; etc. Alternatively, electricity may be generated by using modified internal combustion engines or gas turbines. The main problems arise due to the contaminating gases present in traces, which are corrosive to the metal parts of engines. Lastly, the gas may be purified and exported via a pipeline or as compressed gas or liquid.