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close this bookEngines for Biogas (GTZ, 1988)
close this folder4. Biogas and its Properties as a Fuel for Internal Combustion Engines
View the document4.1 What is Biogas?
View the document4.2 Energy Content of Biogas
View the document4.3 Biogas Consumed as a Fuel
View the document4.4 The Technical Parameters of Biogas/Methane
View the document4.5 Desulphurization and Filtering of Biogas

4.1 What is Biogas?

Biogas originates from bacteria in the process of biodegradation of organic material under anaerobic conditions. It consists of a varying proportion of CH4 (methane) and CO2 (carbon dioxide) and traces of H2S, N, CO, O, etc. The content of CH4 and CO2 is a function of the matter digested and the process conditions like temperature, C/N ratio, etc. Methane is the most valuable component under the aspect of using biogas as a fuel; the other components do not contribute to the calorific ("heating") value and are often "washed out" in purification plants in order to obtain a gas with almost 100% CH4. For further details of biogas production the use of the respective literature is recommended [3, 4, 5, 6].