Design and operational insights of the world’s largest integrated fixed film activated sludge (IFAS) process for low nitrogen limits

Michael Wilson, Julian Sandino, Theresa Cote, Thomas Brueckner, Joshua Boltz, David Michelsen

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Scopus citations

Abstract

The Narragansett Bay Commission (NBC) is in the initial stages of startup of integrated fixed film activated sludge (IFAS) process to achieve a monthly seasonal 5 mg/l total nitrogen effluent permit limit for their 291 MLD (77 mgd) Field’s Point Wastewater Treatment Plant. The upgrades included new fine screens, supplemental alkalinity addition, supplemental carbon addition and conversion of the complete mix activated sludge reactors into plug flow IFAS reactors. Six (6) of the ten (10) reactors are currently converted for IFAS operation. The design was completed in 2008 following a comprehensive procurement process which included a system guarantee from the IFAS system supplier. When completed in 2014, it is expected to be the largest IFAS facility in the world. The initial results of the nitrogen removal performance prior to any system optimization or supplemental alkalinity and carbon addition indicated that effluent total nitrogen ranged from 8 to 12 mg/l total nitrogen (TN). Additionally the sludge volume index (SVI) at the 95 percent occurrence level has been reduced from 300 ml/g pre-IFAS condition to 150 ml/g post-IFAS condition. This paper will present a summary of the system procurement, design and nitrogen performance and operational insight of the new facility.

Original languageEnglish (US)
Title of host publicationWEFTEC 2012 - 85th Annual Technical Exhibition and Conference
PublisherWater Environment Federation
Pages3970-3988
Number of pages19
ISBN (Electronic)9781510870437
DOIs
StatePublished - 2012
Externally publishedYes
Event85th Annual Water Environment Federation Technical Exhibition and Conference, WEFTEC 2012 - New Orleans, United States
Duration: Sep 29 2012Oct 3 2012

Publication series

NameWEFTEC 2012 - 85th Annual Technical Exhibition and Conference
Volume7

Conference

Conference85th Annual Water Environment Federation Technical Exhibition and Conference, WEFTEC 2012
Country/TerritoryUnited States
CityNew Orleans
Period9/29/1210/3/12

Keywords

  • Biological nitrogen removal
  • Clean water oxygen transfer test
  • Complete mix conversion
  • Conventional activated sludge
  • Design
  • Integrated fixed film activated sludge
  • Nitrification
  • Nitrification rates
  • Operational insights
  • System procurement

ASJC Scopus subject areas

  • Ecological Modeling
  • Environmental Chemistry
  • Pollution
  • Waste Management and Disposal
  • Water Science and Technology

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