MODELING THE PERFORMANCE OF ENHANCED BIOLOGICAL PHOSPHORUS REMOVAL SYSTEMS UNDER DYNAMIC LOADING CONDITIONS USING DIFFERENT MATHEMATICAL MODELS
The Activated Sludge Model No. 2 (ASM2) (Gujer et al. 1995) and the Activated Sludge Model No. 3 combined with the EAWAG Bio-P Module (EAWAG model) (Rieger et al. 2001) were evaluated under dynamic loading conditions. These models differ mainly in their approach to model decay processes. While the ASM2 model uses the death-regeneration concept, the EAWAG model uses the endogenous respiration approach. In our modeling study, we found that during and after low loading conditions the specific approach of modeling decay significantly affected model predictions. The two models predicted different levels of the effluent PO4 concentrations during and after the 3-day period of low loading. One structural difference between both models found to be important was that ASM2 assumes decay processes to occur both under aerobic and anaerobic conditions, whereas the EAWAG model assumes decay to take place only under aerobic conditions. Both models predicted an increase in effluent PO4 during the low loading period, which does not agree with experimental results and is assumed to be an artifact. This artifact can be linked to a basic assumption in both ASM2 and the EAWAG model where the decay of polyphosphate accumulating organisms (PAOs) and their storage products is assumed to occur at identical rates. Our experimental observations suggest that the rate of decay for active PAOs is larger compared to the rate of decay for poly-P.
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 These proceedings are not peer reviewed.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