Skip to main content

A Closer Look at the Dangers of Uncalibrated Simulators

The full text article is not available for purchase.

The publisher only permits individual articles to be downloaded by subscribers.

or click here to sign up for a free trial


Sedran et al. (2006) determined the required aerobic reactor volume to achieve 1 mgN/L effluent ammonia in a nitrifying plant, using three commercial simulators (BioWin, GPS-X and Plan-It-Stoat). The paper reports significant differences between the required reactor volumes calculated by different packages using several activated sludge models in each. The authors were unable to find an explanation for these differences. In one scenario of their investigation, Sedran et al. (2006) aimed to ensure that the same models were used, with the same parameters and the same influent data, and still obtained different results from the three packages. This result implies that modeling is an unreliable tool to support wastewater treatment design. The aim of this paper is to clarify some of the questions raised, and provide advice to users of simulation packages to obtain sound process predictions using their simulators. Three simulation companies participated in this study, and all three simulators produced similar or the same results under controlled conditions. The authors of this paper intend to demonstrate that computer modeling can produce consistent results, while at the same time there are model and implementation differences between the packages as taken "out of the box". Simulation providers should strive to provide users with general, easy to follow descriptions of the logic of their models, as well as detailed instructions for specific model details.


Document Type: Research Article


Publication date: October 1, 2007

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 These proceedings are not peer reviewed.

    WEF Members: Sign in (right panel) with your IngentaConnect user name and password to receive complimentary access.
  • Subscribe to this Title
  • Membership Information
  • About WEF Proceedings
  • WEFTEC Conference Information
  • Ingenta Connect is not responsible for the content or availability of external websites

Access Key

Free Content
Free content
New Content
New content
Open Access Content
Open access content
Subscribed Content
Subscribed content
Free Trial 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