Skip to main content

A Hybrid Suspended Growth/RBC Nitrogen Removal Process At Wallingford, Connecticut

Buy Article:

$9.50 plus tax (Refund Policy)

Or sign up for a free trial

The Wallingford Department of Public Utilities implemented a low cost, novel, hybrid nitrogen removal process at the Wallingford Wastewater Treatment Plant consisting of a suspended growth anoxic reactor coupled to their RBC secondary treatment system. The 8.0 MGD Wallingford plant is regulated by the “General permit for Nitrogen Discharges” issued by the State of Connecticut. The process implemented at Wallingford is designed to strike a balance between the cost of construction and operation of the system and the cost of purchasing nitrogen credits, and it was designed with provisions to add a second stage to achieve lower levels of effluent nitrogen.

The Wallingford plant currently includes a nitrification/denitrification process consisting of two anoxic basins, fifty-six rotating biological contactors (RBC's) and four rectangular secondary settling tanks. An Intermediate Pump Station delivers primary effluent and recirculated RBC effluent to the Anoxic Basins. Underflow from the Secondary Settling Tanks is pumped to the Anoxic Basins to develop mixed liquor for the suspended growth anoxic denitrification process. Ammonia and organic nitrogen are converted to nitrate by nitrification in the latter stages of the RBC's. The nitrates are recirculated back to the Anoxic Basins where nitrates are reduced by the denitrification process.

The process was started up in May 2005, and did not perform as well as anticipated based on the results of pilot testing. In collaboration with the design team from AECOM (Formerly Earth Tech), the operations staff at the Wallingford facility stepped up and did an excellent job of resolving the operational problems and developed an excellent understanding of the processes introduced at the plant. Over the next two years of operation the process was fine-tuned, providing optimum results.
No Reference information available - sign in for access.
No Citation information available - sign in for access.
No Supplementary Data.
No Article Media
No Metrics

Keywords: Hybrid process; Nitrogen Removal; Operational Experience; RBC Treatment; Suspended Growth

Document Type: Research Article

Publication date: 01 January 2009

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
X
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