The Principle of Anaerobic Digestion.
In this video we will list the 5 principle functions for which the anaerobic digestion process is used, what "feeds" the process, and the what happens during the process.
1. The production of methane gas.
2. Lower operational costs when used for sewage sludge treatment, and for income from biogas production while reducing waste management problems and providing a good fertilizer, when used in agriculture.
3. Digested sludge has less odor, and a reduced emission of ammonia.
4. It reduces pathogens in sewage treatment and manure slurry on livestock farms.
5. It reduces sludge volume by destruction of volatile solids.
What feeds the process.
The organic solids in the feed sludge are used as "food" by the bacteria in the digester.
What are the main stages of anaerobic digestion.
What happens during the process.
The acid forming bacteria break-down organic solids and form organic acids. The methane
forming bacteria convert the organic acids to methane gas, carbon dioxide, and water.
The non-volatile solids along with a few non-biodegradable organic solids become digested
sludge.
Digester gas is not pure methane but a mixture of methane, water vapor, carbon dioxide, and hydrogen sulfide.
Source Reference: Wisconsin Department of Natural Resources, Introduction to Anaerobic Digestion Study Guide at http://dnr.wi.gov

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