Skip to main content

Development of Final Sedimentation Tank Maximum Operating Capacity Curves using Vesilind Settling Parameters and Mathematical Modeling

Buy Article:

$17.50 plus tax (Refund Policy)

Or sign up for a free trial

Abstract:

New advances in development of maximum operating capacity curves using final sedimentation tank (FST) computational fluid dynamic (CFD) package – High Accuracy Clarifier Model (HACM©) and Vesilind settling parameters (Vo and k) were successfully applied in a recent project at the Sai Kung Sewage Treatment Works of the Drainage Services Department (DSD) in Hong Kong. The advances consist of more accurate maximum capacity predictions of the FST for a range of Vo and k determined on-site, instead of their estimation using generalized sludge volume index/stirred sludge volume index (SVI/SSVI) values with empirical correlations to minimize any erroneous capacity predictions. A set of standard maximum operating capacity curves of the FST suitable for future usage under year round operation were developed using representative operating ranges of mixed liquor suspended solids levels and return activated sludge flowrates and settling characteristics in terms of Vo and k. To make it more user-friendly, the SVI/SSVI and Vo & k correlation can also be established for the operators to input SVI/SSVI data to predict FST capacity/performance, particularly when sludge settling characteristics deteriorate/improve under high/low loading conditions. However, Vo and k values and the SVI/SSVI and Vo & k correlation should be updated every three to six months, or whenever a major operational and/or configuration change occurs in the STW affecting the biological process.

Standard FST CFD packages such as HACM© Model can predict FST performance accurately using SVI/SSVI data to be within +/−10% of the actual capacity. It is recommended to conduct FST stress testing to confirm the improved accuracy, if any, when the frequently updated Vesilind settling parameters (Vo and k) and the empirical correlation of SSVI to Vo & k are used as inputs to the models.

Document Type: Research Article

DOI: https://doi.org/10.2175/193864706783710596

Publication date: 2006-01-01

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
  • 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
X
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