Skip to main content


Buy Article:

$9.50 plus tax (Refund Policy)

Or sign up for a free trial

Wastewater treatment plants across the United States are faced with increasingly more stringent discharge limitations on phosphorus and nitrogen. These facilities are now challenged to find an economical means to upgrade treatment in order to meet new limitations. The reasons for these limitations are numerous and include issues such as eutrophication in water bodies such as Chesapeake Bay, Long Island Sound and the Gulf of Mexico particularly at the discharge of the Mississippi River, implementation of TMDLs, water reservoir protection from nutrient overload, and reuse regulations which protect groundwater from nitrate contamination. Many wastewater treatment plants, particularly those in the coastal regions, were originally built as carbonaceous removal activated sludge plants. Implementing nutrient control at these plants normally implies significant aeration basin expansion to achieve the sludge age required for nitrification.

In addition to the need for capacity expansion, the City and County of Broomfield Colorado was challenged with pending nutrient limitations. A study of potential options revealed that implementation of a hybrid system through conversion of the existing aeration basins to integrated fixed-film activated sludge using suspended plastic carriers, coupled with the addition of upstream anaerobic and anoxic basins, was the most economical solution when compared to three other alternatives.

An on-site pilot study was conducted to confirm the design parameters and conditions which would yield reliable nitrogen control. Primary objectives of the four-month pilot study were to verify reliable winter nitrogen control at a reduced suspended sludge age, quantify nitrification rates, document impacts of residual dissolved oxygen levels on nitrification performance, determine the degree of simultaneous nitrification and denitrification in the aerobic zone, and investigate the sludge and attached-growth characteristics of the integrated fixed film activated sludge system. This paper presents the results of the pilot study and provides discussion of the main design considerations gleaned from this study. Construction of the full-scale facilities is underway and the first of two IFAS treatment train is expected to be in operation by the end of the year 2002.
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: 2002-01-01

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