Anaerobic digesters provide an environment for the oxygen-free decomposition of organic materials by bacteria.  We are more familiar with aerobic decomposition that takes place in compost heaps that are "aerated" by frequent turning to expose materials to oxygen-rich air.   In contrast, anaerobic digestion requires a sealed and often heated environment that has no oxygen present-similar to conditions in your own stomach. In each situation described above, different kinds of decomposing bacteria work to break down complex fats, proteins and carbohydrates into simpler elements. When bacteria can multiply and grow it results in sanitation of the influent, and energy generation. The methane gas (biogas) produced by the bacteria can be used to power an onsite generator. (Above photo courtesy of Scenic View Dairy, Fennville, MI)
 
Anaerobic Digester FAQs

Why Anaerobic Digesters Fail

Current AD Projects in Michigan

Scenic View Dairy
MAREC Grand Valley State University 

Related Links

AgSTAR
Agricultural Marketing Research Center  
AD related Grants funded by MBEP  

Anaerobic Digestion Publications