Skip to main content

Improved Prediction of Nitrogen Removal Using Updated ASM1 Default Parameters Verified at 13 Full-scale Plants

Buy Article:

$9.50 plus tax (Refund Policy)

Or sign up for a free trial

The Activated Sludge Model n°1 (ASM1) published in 1987 is still one of the main models used in simulation projects for design and optimization of processes. It was published with a set of default parameter values at 20°C and at 10°C that reflected the best knowledge twenty years ago. Several recent lab-scale studies using experiments conducted under controlled conditions have pointed out that some of these default values may be inadequate. The endogenous decay rate of nitrifiers appears to be higher than originally assumed, while the heterotrophic yield was shown to have a lower value under anoxic conditions. As these results were issued by several different lab experiments, it is difficult to define the domain of validity of the measured parameter values, and to evaluate if a simple aggregation of the new information leads to a correct set of default parameters. Moreover most of the tests were conducted at 20°C, so the parameter values have not been confirmed at 10°C. To address these concerns, simulations were carried out with the updated set of parameters to evaluate its ability to provide improved predictions compared to observed data collected at 13 nitrifying-denitrifying municipal treatment plants. The measured maximum nitrification rates and the nitrogen concentration in the effluent were selected as the output variables to assess the model predictions. The work proves that simulations using the original ASM1 default parameters tend to overpredict the nitrification rates and underpredict the denitrification stœchiometry. The updated set of parameters allows more realistic predictions, over a wide range of operating conditions.
No Reference information available - sign in for access.
No Citation information available - sign in for access.
No Supplementary Data.
No Article Media
No Metrics


Document Type: Research Article

Publication date: 2007-10-01

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 These proceedings are not peer reviewed.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
  • Access Key
  • Free content
  • Partial Free content
  • New content
  • Open access content
  • Partial Open access content
  • Subscribed content
  • Partial Subscribed content
  • Free trial content
Cookie Policy
Cookie Policy
Ingenta Connect website makes use of cookies so as to keep track of data that you have filled in. I am Happy with this Find out more