Skip to main content


Buy Article:

$9.50 plus tax (Refund Policy)

Or sign up for a free trial

Though commonly associated with stable and robust BOD removal and nitrification, oxidation ditch systems are now being designed and operated to achieve nitrogen removal through separate anoxic zones and simultaneous nitrification-denitrification. In some cases, operating data suggest that some degree of unintentional biological phosphorus removal (Bio-P) could be occurring in these processes, but it is typically difficult to assess. The operating sequence of the proprietary Phases Isolation Ditch (PID) process, which can be designed for efficient total nitrogen removal and eliminates the need for secondary clarifiers, was modified at a 0.6 MGD treatment plant to include an anaerobic fill phase in hopes of achieving some degree of Bio-P. The objective of this investigation was to evaluate polyphosphate accumulating organism (PAO) activity in the PID process. This work was done to determine whether PAO activity could be responsible for the relatively efficient and otherwise unexplainable P removal currently being observed at this plant. Using phosphorus release rate measurements and comparing these values to that previously published in a survey of Bio-P plants, it is clear that this facility is successfully achieving some degree of biological phosphorus. However, influent Al and Fe loading is significant and could be responsible for some degree of the observed P removal.
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: 2007-01-01

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 These proceedings are not peer reviewed.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