Ammonia Phosphorus Removal, Metropolitan Syracuse Treatment Plant Onondaga County, New York USA

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In partnership with two other firms GHD was retained by Onondaga County, New York to provide engineering services in connection with the design and construction of improvements to its 84 million-gallon-per day Metropolitan (METRO) wastewater treatment plant, with the objective of upgrading the level of wastewater treatment provided for ammonia and phosphorus removal.

The project established that the facility, which provided conventional secondary treatment (with seasonal nitrification and phosphorus removal to less than 1.0 mg/L), needed to be upgraded to provide year-round ammonia removal (1.0 mg/L as N for June 1st to October 31st, and 2.0 mg/L for November 1st to May 31st), and phosphorus removal to 0.12 mg/L TP for a 12-month rolling average.

The upgrade project included the design and construction of tertiary biological aerated filters (BAF) for year-round ammonia removal; a high-rate flocculated settling system (HRFS) for achieving Stage II phosphorus removal and an ultraviolet system for disinfection. Prior to design, pilot testing was performed to determine design criteria and demonstrate performance capabilities for BAF and HRFS systems.

Effluent ammonia concentrations have been reduced to less than 2 mg/L during cold weather operating conditions (wastewater temperatures down to 8º C) and effluent phosphorus concentrations have been reduced from approximately 0.8 mg/L to less than 0.12 mg/L.



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