SIMULTANEOUS NITRIFICATION-DENITRIFICATION AND CLARIFICATION IN PSEUDOLIQUIFIED ACTIVATED SLUDGE SYSTEM
This paper describes results from a pilot study of a novel wastewater treatment technology, which incorporates nutrient removal and solids separation in a single step. The pseudoliquified activated sludge process pilot system was tested on grit removal effluent at hydraulic loading rates of 29.4 to 54.7 m3/d, three different SRT: 15, 37, and 57 days, and over a temperature range of 12–28°C. Despite wide fluctuations in the influent characteristics, the system performed reliably and consistently with respect to organics and TSS removals, achieving BOD and TSS reductions of > 96% and about 90% respectively achieving BOD5 and TSS concentrations as low as 3 mg/l. Although the system achieved average effluent ammonia concentrations of 2.7–3.2 mg/l, nitrification efficiency was hampered at low temperatures (<13°C). The system achieved tertiary effluent quality with denitrification efficiencies of 90%, and 91% total nitrogen removal efficiency., at a total HRT of 4.8 hours and an SRT of 12–17 days. With ferric chloride addition, effluent phosphorous concentrations of 0.5–0.8 mg/l were achieved. Furthermore, due to operation at high biomass concentrations, and relatively long biological solids residence times, sludge yields were over 50% below typical values for activated sludge plants.
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: 01 January 2002
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 These proceedings are not peer reviewed.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