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New to anaerobic digestion? Let AD 101 walk you through a biogas recovery system. (Photo: GE Energy, Jenbacher gas engines)
U.S. Environmental Protection Agency's AgSTAR Program is a voluntary outreach and educational program that promotes the recovery and use of methane from animal manure.
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Anaerobic Digester System Flow Diagram
AgSTAR developed an illustration to show the outputs that result from anaerobic digester systems. Although each system is different, the three main outputs are:
- Liquids (e.g., fertilizer)
- Solids (e.g., bedding)
- Biogas (e.g., electricity, heat)
What's New
January 25, 2012 – AgSTAR Releases New Fact Sheets more »
January 19, 2012 - AgSTAR Releases Winter 2012 Digest more »
January 19, 2012 – Agenda Available for Got Manure? Conference. Register Now! more »
December 21, 2011 – AgSTAR Updates Project Database more »
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February 14-16, 2012 – World Agriculture Expo more »
February 23-24, 2012 – USDA Agricultural Outlook Forum more »
March 27-29, 2012 - Got Manure? Enhancing Economic and Environmental Sustainability more »
April 16-19, 2012 - 26th Annual BioCycle West Coast Conference more »
Frequent Questions
How do you get energy from manure? 
How are digester projects usually funded? 
Interested in updates? Sign up for the AgSTAR Listserv.
USDA provides a number of resources related to anaerobic digesters on US farms. Learn more about Rural Development and Natural Resources Conservation Service resources.