Skip to main content

RETROFITTING WALLINGFORD'S RBC'S FOR NITROGEN REMOVAL

Buy Article:

$9.50 plus tax (Refund Policy)

Or sign up for a free trial

Faced with the prospect of having to purchase nitrogen credits under Connecticut's new General Permit and nitrogen credit trading program, the Town of Wallingford opted to study ways in which a denitrification process could be added to their existing 30,000 M3 /Day (8.0 MGD )wastewater treatment plant. The Wallingford plant uses 56 Rotating Biological Contactors (RBC's ) for BOD removal and nitrification.

Wallingford currently discharges an average of 295 kg/d (650 lb/d ) of nitrogen to the Quinnipiac River. Effluent total nitrogen limits established in the General Permit for Wallingford vary from 244 kg/d (537 lb/d ) in 2002 to 122 kg/d (269 lb/d ) in 2014. Nitrogen credits will be bought and sold by the Connecticut DEP, penalizing those municipalities not meeting their permit limits and rewarding those municipalities removing nitrogen in excess of their permit requirements.

Three alternatives were studied in detail:



Fluidized Bed Denitrification Reactors


Submerged RBC's


Suspended growth pre-denitrification supplemented by attached growth post-denitrification


The selected alternative utilizes an anoxic basin upstream from the RBC's which is fed by Primary effluent and recirculated RBC effluent. Underflow from the secondary clarifiers is pumped to the anoxic basin to develop mixed liquor. This process was piloted to verify its feasibility and to develop design criteria. A secondary anoxic basin, using submerged RBC's to provide a media for growth of denitrifying microorganisms, will be included in the project to trim remaining nitrates.
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: 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 These proceedings are not peer reviewed.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
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