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Pilot Study Confirms Design of IFAS System for Nitrogen Reduction in Connecticut

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Facing a new effluent total nitrogen discharge limit, the Town of Stafford Springs Connecticut chose to upgrade their Water Pollution Control Facility using a fixed media Integrated Fixed-Film/ Activated Sludge (IFAS) system. The IFAS media would allow a retrofit of the existing aeration basins for biological nutrient removal without having to add basin volume. The raw influent wastewater was a mixture of municipal and industrial wastes that included at high concentration of fibrous suspended solids from a local textile manufacturer. Because of the unusual nature of the wastewater, a pilot study was commissioned to confirm the design basis for the IFAS system. After good initial results, the pilot study was cut short due to operational difficulties associated with the fibrous influent. Other fixed media IFAS systems were studied to help confirm the design rate, and the Town decided to proceed with construction of the IFAS system in April of 2009.
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Keywords: BioWeb; integrated fixed-film activated sludge; nitrification

Document Type: Research Article

Publication date: 2009-01-01

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