anaerobic digestion

A process where microorganisms break down organic materials, such as food scraps, manure, and sewage sludge, in the absence of oxygen, produces a gas principally composed of methane (CH4) and carbon dioxide (CO2) otherwise known as biogas.

Citation: 
http://www.epa.gov/wastes/conserve/foodwaste/fd-anaerobic.htm
English

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