OXYGEN TRANSFER AND CONSUMPTION IN A BIOLOGICAL AERATED FILTER
The gas/liquid mass-transfer coefficient was measured over a wide range of gas and liquid flow rates in a submerged-media biological aerated filter under both abiotic and biotic conditions. A bench-scale unit was used to determine the mass-transfer coefficient without biological activity and a pilot-scale unit was used to evaluate oxygen transfer under nitrifying conditions. Abiotic liquid-side, mass-transfer coefficients (KLa) measured using a nitrogen gas stripping method, were found to increase as both gas and liquid superficial velocities increase, with values ranging from approximately 40 to 380 h−1. The overall effect of variables including gas and liquid velocities, dirty water to clean water ratios, and liquid temperature, was correlated to within ± 20% of the experimental KLa value. The nitrifying biological aerated filter pilot unit operated for 5 months at a domestic wastewater treatment facility under varying hydraulic and pollutant loadings. Endogenous respiration contributed to only 2 to 7% of the total oxygen demand with regions of biomass activity changing with respect to the applied loading conditions. The biotic KLa values inferred using an overall oxygen balance ranged between 64 and 158 h−1 for the experimental conditions evaluated. Comparing abiotic and biotic mass-transfer coefficients suggests that an apparent biological oxygen transfer enhancement may occur in the biologically active pilot. The enhancement could be accounted for by either an increase in KLa or the associated concentration driving force.
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: 2003-01-01
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 These proceedings are not peer reviewed.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