title: Anaerobic digestion
text: Anaerobic digestion is the way microorganisms break down organic matter without oxygen. This process happens naturally, but it is called anaerobic digestion when it is supported and contained. 
  
  An anaerobic digester is an industrial system that supports this process. Biodegradation to treat waste is one of the main purposes. Generating biogas to provide fuel is another. It also produces soil improving material.
  
  References
  
  Other websites 
  Digestion archives 
  European Anaerobic Digestion Network
  Independent Anaerobic Digestion Website
  Thermophilic Anaerobic Digesters 
  Methane (Biogas) from Anaerobic Digesters
  Application of anaerobic digesters 
  Anaerobic Biodigester Design for Small Tropical Producers 
  
  Energy
  Zoology
  Physiology