Skip to main content


Buy Article:

$17.50 plus tax (Refund Policy)

Or sign up for a free trial


This study was a full-scale investigation of the benefits and limitations of implementing aerated-anoxic conditions in a UCT variation process. Two treatment trains were used; one was modified to include the aerated-anoxic section in the UCT variation process while the other remained unmodified and served as a control of normal operation. The modified treatment train had a modest increase in total nitrogen removal (from 52% to 63%) and a slight deterioration in effluent ammonia levels, although the latter was caused by an increased flow into the modified treatment train rather than the creation of aeratedanoxic conditions. The results of AOB population dynamics, monitored using an amoA-based terminal restriction fragment length polymorphism (TRFLP) method suggested that the aerated-anoxic condition maintained the N. europaea lineage AOB population, presumably due to its high affinity for oxygen. In addition to nitrogen removal, the study also demonstrated that including an aerated-anoxic section in a UCT process does not negatively affect phosphorus removal. Although not sufficient for significant nitrate removal, the aerated-anoxic UCT combination can be implemented in full-scale if organic substrate distribution for both phosphorus and nitrogen removal is optimized. Perhaps the most significant benefit of this proposed configuration is the potential savings in aeration cost.

Document Type: Research Article


Publication date: 2004-01-01

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 These proceedings are not peer reviewed.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