Skip to main content

Combining Stress Testing and Dynamic Linking of Whole Plant Simulators and CFD for the Evaluation of WWTP Wet Weather Capacity

Buy Article:

$17.50 plus tax (Refund Policy)

Or sign up for a free trial


The development of more stringent effluent nutrient standards requires improved understanding and reliability of unit process performance during typical and stressed conditions. State of the art tools are needed for the evaluation of these units in order to ensure optimum performance during these conditions. Two of the most power tools available today are whole plant simulators such as BioWin™, GPS-X; and Computational Fluid Dynamics (CFD) models. Through the application of two case studies, this paper illustrates the combined use of a whole plant simulator and a secondary clarifier CFD model for the evaluation of wet weather strategies and for the assessment, design and retrofitting of secondary clarifiers.

In the first case study, after calibration and validation with stress testing data, a BioWin model was linked to a 2Dc CFD clarifier model for the determination of the wet weather capacity of a Kentucky wastewater treatment plant. The results indicate that clarifier improvements and step feed are needed in order to sustain the extreme wet weather flows for this plant. In the second case study, the calibrated 2Dc model was applied to assess the capacity of existing 39.6 m (130 ft) diameter clarifiers and to the design of a new 48.8 m (160 ft) clarifier. In conjunction with BioWin, the 2Dc CFD model was used to evaluate the impact of using step feed, non-step feed and polymers during a storm event. The results show that the combined used of step-feed and polymers during a wet weather event can improve the performance of the secondary clarifiers by 80%, reducing the effluent suspended solids from approximately 160 mg/L to below 30 mg/L.

Keywords: WWTP whole plant simulators; dynamic modeling; secondary clarifiers CFD modeling; wet weather

Document Type: Research Article


Publication date: 2010-01-01

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 These proceedings are not peer reviewed.

    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 ContentFree content
  • Partial Free ContentPartial Free content
  • New ContentNew content
  • Open Access ContentOpen access content
  • Partial Open Access ContentPartial Open access content
  • Subscribed ContentSubscribed content
  • Partial Subscribed ContentPartial Subscribed content
  • Free Trial ContentFree 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