Skip to main content

The Operator's Guide to Monitoring Secondary Clarifier Performance

Buy Article:

$17.50 plus tax (Refund Policy)

Or sign up for a free trial

The State Point Analysis (SPA) procedure, formalized by Keinath, et. al. (1977), provides exceptional insight into the expected performance of activated sludge secondary sedimentation basins. Yet, the operating guidance offered by the SPA is not employed regularly and with confidence - particularly by operations personnel. Such lack of use may stem from the perceived complexity of the procedure, including the (unnecessary) need to perform graphical constructions.

The paper seeks to encourage the application of SPA principles by presenting straightforward algebraic and spreadsheet calculations for assessing the risks of clarification or thickening failure in clarifiers.

Clarifier performance is monitored by evaluating a Clarification Safety Factor, based on comparing the observed settling velocity of the sludge with the overflow rate in the clarifiers. Similarly, a calculated Thickening Safety Factor provides warning of impending process limitations due to deteriorating settleability or limited return sludge pumping capacity. The mathematical background is summarized and step-by-step calculations are detailed in the paper.
No Reference information available - sign in for access.
No Citation information available - sign in for access.
No Supplementary Data.
No Data/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 These proceedings are not peer reviewed.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