Simultaneous Biological Nutrient Removal in a Single-Stage, Low Oxygen Aerobic Reactor
Simultaneous biological nutrient removal (SBNR) is referred to as the biological process where nitrogen and phosphorus in excess of that required for biomass synthesis are removed in a biological wastewater treatment system without defined anaerobic or anoxic zones. Although SBNR systems offer several potential benefits, these cannot be fully realized until the factors controlling SBNR are better understood. A single reactor activated sludge pilot plant was operated with acetate as the only influent organic in synthetic wastewater. The system was operated at 20°C and an SRT of approximately 10 days, and DO was maintained in the range of 0.3 to 0.5 mg/L. Once the system stabilized to a steady state, influent ammonia was increased step-wise during the 90 day study period from 20 to 60 mg N/L after which influent COD was doubled from 300 to 600 mg/L. The system exhibited SND, essentially with complete nitrification and a uniform amount of denitrification. Near-complete denitrification was observed for an influent rbCOD:N ratio of greater than 10:1. Biological phosphorus removal also occurred in the system; effluent P was approximately 0.25 mg P/L with an influent concentration of 8 mg P/L. Batch tests were conducted with mixed liquor from the pilot plant spiked with initial COD, ammonia and phosphate concentrations approximately equal to the pilot plant influent concentrations. Results provided further insights into the factors controlling SBNR. Model growth rate equations for two-step nitrification and denitrification were useful for discussing the phenomena, together with calibrating a model to the experimental results.
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: 2011-01-01
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 These proceedings are not peer reviewed.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