In July 2001, the Rhode Island Department of Environmental Management and the Town of East Greenwich entered into a Consent Agreement to upgrade the 1.7 mgd wastewater treatment plant to meet a strict new seasonal total nitrogen limit of 5 mg/L. Utilizing proprietary Severn Trent Services
treatment technology, Tighe & Bond, Inc. designed an innovative upgrade to reduce nutrient loading to Greenwich Cove, an important recreational area of Narragansett Bay. The nitrogen removal system utilizes a tertiary two-stage, biological filtration process where ammonia is oxidized
to nitrate (nitrification) in the first stage and the nitrate is subsequently reduced to nitrogen gas (denitrification) in the second stage. The nitrogen removal system initiated operation in April 2006 and the data collected during the three compliance periods of 2006, 2007, and 2008 indicate
that the process performance of the system has been excellent. The WWTP successfully met the 5 mg/L total nitrogen limit during all compliance periods, including the colder weather month of May.
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