EFFECTS OF FERRIC HYDROXIDE ON METHANOGENESIS FROM LIPIDS AND LONG-CHAIN FATTY ACIDS IN ANAEROBIC DIGESTION
Addition of ferric hydroxide to sludge from a municipal anaerobic digester stimulated the rate of methanogenesis from canola oil when the oil was present at an initial concentration of 4600 mg/L. Similar trends were observed when oleic acid, a long-chain fatty acid that is a major component of canola oil triglycerides, was provided at 4400 mg/L, but the effects on the rate of methane production from oleic acid were not statistically significant (P = 0.093). Although iron reduction occurred whenever ferric hydroxide was added to anaerobic sludge microcosms containing canola oil or oleic acid, it had no effect on the rate of methane production from these substrates when the initial concentrations were about 900 mg/L. Iron reduction occurred in acetate-amended anaerobic sludge microcosms, but the extent of Fe(II) production was much less than was observed in microcosms provided with canola oil or oleic acid. Methanogenesis and acetate consumption were completely inhibited when the initial acetate concentration was about 5000 mg/L, regardless of the initial concentration of ferric hydroxide. The main effect of ferric hydroxide in this system appears to have been due to stimulation of the rate of fatty acid oxidation.
No Reference information available - sign in for access.
No Citation information available - sign in for access.
No Supplementary Data.
No Article Media
Document Type: Research Article
Publication date: 2005-01-01
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 These proceedings are not peer reviewed.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