Denitrification Kinetic Parameters: A Comparison of Decay Rates Observed in Denitrifying Populations Grown On Methanol and Ethanol
Abstract:Two 6-L sequencing batch reactors (SBRs) were seeded with biomass and fed synthetic wastewater at 60 mg/L NO− 3-N. The SBRs were operated in alternating aerobic/anoxic stages for 4 months to allow biomass to become acclimated to a carbon source for denitrification – methanol in one reactor and ethanol in the other. Following acclimation, nitrate and carbon feeds were stopped and a continuous anoxic environment was maintained in the reactors. On 8 occasions, subsamples were transferred from the parent reactors to separate batch reactors. The batch reactors were spiked with carbon and decay rate was estimated via the change in nitrate reduction rate with time. Decay rate determined for populations grown on methanol agree well with the literature at 0.04 d−1 based on NOx concentrations. For populations grown on ethanol, measured decay rate (0.05 d−1) was lower than textbook values of 0.16 and 0.30 d−1 for the traditional and lysis/regrowth models, respectively.
Document Type: Research Article
Publication date: 2010-01-01
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 These proceedings are not peer reviewed.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