Anaerobic digestion is a naturally occurring biological process in which large numbers of anaerobic bacteria convert organic matter into methane and carbon dioxide (a mixture called biogas) in the absence of air. This process stabilizes the organic matter in wastewater solids, reduces pathogens and odors, and reduces the total solids/sludge quantity by converting part of the volatile solids (VS) fraction to biogas. Anaerobic digestion results in a product that contains stabilized solids, as well as some available forms of nutrients such as ammonia- nitrogen.You may need a PDF reader to view some of the files on this page. See EPA’s About PDF page to learn more.
- Multi Stage Anaerobic Digestion (PDF)(13 pp, 244 K, September 2006, EPA 832-F-06-031)