Skip to main content

Sludge Quality: The Key to Secondary Clarifier Performance

Buy Article:

$9.50 plus tax (Refund Policy)

Or sign up for a free trial

Within the wastewater treatment profession there is considerable disagreement as to the best method for controlling the activated sludge process regardless of whether nutrient removal is an objective or not. There is little disagreement, however, as to the profound impact that the performance of the secondary clarifier has on the overall performance of the activated sludge process: total suspended solids (TSS) escaping the secondary clarifier are mostly organic and contain significant quantities of both nitrogen and phosphorus.

There is no question that the aeration basin and secondary clarifier in any activated sludge system are inextricably connected to each other. This is the essence of Wanner's statement (2006): “The modern approach to the [design and operation of the] activated sludge process looks at both the biological and the separation stage as one system.” This explains the focus, pervasive throughout the wastewater industry, on “meeting permit.” In developing process control strategies, however, it is important for operations personnel to consider the process objectives of the aeration basin and the secondary clarifier separately to ensure they are both being met, because they are quite different.

It is interesting to note that in the call for abstracts for this specialty conference on nutrient removal that “Process Control” shows up in both the categories Operational Issues and Design Issues, but not in Research Issues. It is the author's opinion, and the focus of this paper, that the profession needs to develop and standardize process control tools that allow operators to quantify sludge quality.

A test apparatus and testing sequence is suggested for operators to measure activated sludge quality.
No Reference information available - sign in for access.
No Citation information available - sign in for access.
No Supplementary Data.
No Article Media
No Metrics

Document Type: Research Article

Publication date: 2007-01-01

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 These proceedings are not peer reviewed.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
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