NON-INVASIVE MONITORING FOR EARLY WARNING NITRIFICATION FAILURE
Abstract:Work at full-scale wastewater treatment plants was carried out in order to establish whether N2O could be used to predict nitrification failure. Previous research on a pilot-scale activated sludge plant had shown a strong correlation between the increased N2O concentration monitored in the aeration tank, and the appearance of NH3 in the effluent, giving rise to the possibility that N2O could be used as an indicator for nitrification failure. N2O emissions were continuously monitored at two full-scale wastewater treatment plants, one municipal works and one industrial works. An activated sludge lane was continuously monitored at the municipal works. The results showed N2O concentrations of 7.2 ppm immediately after the anoxic zone, followed by a decrease in the N2O off-gas to background emissions ranging 0 − 2.1 ppm. The industrial works used a two-stage process for nitrogen removal, with both processes (stage one aeration tank and stage two aeration tank) and an anoxic tank continuously monitored. Stage one showed high peaks of off-gas N2O and NOx with background emissions ranging 0 − 80 ppm for N2O. Stage two had small spikes of N2O and NOx with background emissions ranging 0 − 20 ppm. High amounts of N2O were found in the denitrification tank with background emissions ranging 0 − 80 ppm. The results showed that the municipal plant had potential for using N2O to predict nitrification failure, where as the industrial plant with higher and more variable N2O release was more problematic.
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 These proceedings are not peer reviewed.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