TY - GEN
T1 - Design and operational insights of the world’s largest integrated fixed film activated sludge (IFAS) process for low nitrogen limits
AU - Wilson, Michael
AU - Sandino, Julian
AU - Cote, Theresa
AU - Brueckner, Thomas
AU - Boltz, Joshua
AU - Michelsen, David
N1 - Publisher Copyright:
Copyright © 2012 Water Environment Federation. All Rights Reserved.
PY - 2012
Y1 - 2012
N2 - 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.
AB - 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.
KW - Biological nitrogen removal
KW - Clean water oxygen transfer test
KW - Complete mix conversion
KW - Conventional activated sludge
KW - Design
KW - Integrated fixed film activated sludge
KW - Nitrification
KW - Nitrification rates
KW - Operational insights
KW - System procurement
UR - http://www.scopus.com/inward/record.url?scp=85070457977&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85070457977&partnerID=8YFLogxK
U2 - 10.2175/193864712811708248
DO - 10.2175/193864712811708248
M3 - Conference contribution
AN - SCOPUS:85070457977
T3 - WEFTEC 2012 - 85th Annual Technical Exhibition and Conference
SP - 3970
EP - 3988
BT - WEFTEC 2012 - 85th Annual Technical Exhibition and Conference
PB - Water Environment Federation
T2 - 85th Annual Water Environment Federation Technical Exhibition and Conference, WEFTEC 2012
Y2 - 29 September 2012 through 3 October 2012
ER -