Anaerobic Phased Solids Digestion of Mixed Wastes
The anaerobic phased solids (APS) digestion process is a two-phase semi-batch feed thermophilic digestion process that is particularly well suited to high solids content wastes. The APS process couples multiple batch fed hydrolysis digestion tanks with a methanogen-friendly biogasification tank using intermittent circulation of free liquid between the tanks. Lab scale testing has been followed by a commercial demonstration system completed in late 2006. Lab scale test results were promising in that good volatile solids (VS) destruction and continuous overall gas production were observed despite the batch feeding of the hydrolysis tanks. Digestion of a 50%-50% mixture (on a VS basis) of green waste and food waste produced 0.32 liter (L) methane per g of VS and an 82% VS reduction. The commercial demonstration APS system at the University of California, Davis (UC Davis) is being used to evaluate green waste, food wastes, and waste mixtures for materials handling considerations, process optimization, and gas production. Materials handling equipment adapted from various industrial sources has generally worked well during initial runs of the commercial demonstration system. Initial gas production results have been in line with expectations from lab test results. Improvements are being made to the heating and mixing systems. Additional tests are planned for co-digestion of other mixed wastes, including wastewater sludge and food processing wastes.
No Reference information available - sign in for access.
No Citation information available - sign in for access.
No Supplementary Data.
Document Type: Research Article
Publication date: 2007-10-01
More about this publication?
- Proceedings of the Water Environment Federation is an archive of papers published in the proceedings of the annual Water Environment Federation® Technical Exhibition and Conference (WEFTEC® ) and specialty conferences held since the year 2000. These proceedings are not peer reviewed. A subscription to the Proceedings of the Water Environment Federation includes access to most papers presented at the annual WEF Technical Exhibition and Conference (WEFTEC) and other conferences held since 2000. Subscription access begins 12 months after the event and is valid for 12 months from month of purchase. A subscription to the Proceedings of the Water Environment Federation is included in Water Environment Federation (WEF) membership.
WEF Members: Sign in (right panel) with your IngentaConnect user name and password to receive complimentary access. Access begins 12 months after the conference or event
- Subscribe to this Title
- Membership Information
- About WEF Proceedings
- WEFTEC Conference Information
- Learn about the many other WEF member benefits and join today
- Ingenta Connect is not responsible for the content or availability of external websites