Anaerobic digestion is a biological process. Anaerobic digesters provide an environment for the oxygen-free decomposition of organic materials by bacteria. It produces a gas principally composed of methane (CH4) and carbon dioxide (CO2) otherwise known as biogas in an oxygen-free environment.
These gases are produced from organic wastes such as livestock manure, food processing waste, etc. The manure or waste is broken down in an airtight container called digester by using bacteria and water. This process releases the methane.
Methane is the principle constituent in natural gas. Biogas is composed of 55%-80% pure methane. The remaining porting is carbon dioxide. State-of-the-art systems report producing biogas that is more than 95 percent pure methane. |