Skip to main content

Evaluation of Three Full-scale Grit Removal Processes using CFD Modeling

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


The Hampton Roads Sanitation District (HRSD) operates thirteen wastewater treatment plants (WWTP) in Southeastern Virginia with various grit removal technologies. HRSD has been confronted with poor grit removal resulting in abrasive wear of equipment, reduction of volume in bioreactors, digesters, and incinerators. Each of these consequences has increased operational cost. Computational fluid dynamics (CFD) modeling was used to study and evaluate grit removal for: forced vortex, detritor, and stacked structured vortex units. The goal was to compare and observe the operating dynamics of the three grit removal technologies, modeled at the rated design flow rates of each unit. The study revealed that CFD modeling: is appropriate for this application; correlated with field test data and observations; can be used to evaluate unit process improvements; can be used to evaluate the effect of process variables such as flow and specific gravity; and the CFD models predicted that a detritor had the highest grit removal efficiency of the units investigated, followed by the stacked structured vortex unit. For the forced vortex unit, the modeling indicated that grit is not substantially removed according to the vortex mechanism, and rather that Type I discrete particle settling velocity and thus surface overflow rate are the most important factors leading to removal of grit.

Document Type: Research Article


Publication date: January 1, 2012

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 These proceedings are not peer reviewed.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
Partial Open Access Content
Partial 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