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Nitrogen Removal Design, Startup, and 6 Years of Operation in Scituate, Massachusetts

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Scituate Massachusetts, located on the coast of eastern Massachusettts, is a 1.6 mgd average flow plant with stringent total nitrogen (TN) permit limits and discharge to shellfish waters. Nitrogen removal is achieved using activated sludge for nitrification and Tetra Denit Fitlers for denitrification. Winter monthly temperatures drop to 9°C. Plant effluent averaged 3 mg/L TN, 3 mg/L carbonaceous biochemical oxygen demand (CBOD) and 4 mg/L total suspended solids (TSS) over the 6 year period following startup. Performance of the Tetra filters exhibited continuous improvement over the first 5 years. Full scale testing of an alternative carbon source for methanol provided problematic. This paper presents design considerations, startup issues, and 6 years of operational data.

Document Type: Research Article


Publication date: January 1, 2007

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  • Proceedings of the Water Environment Federation is an archive of papers published in the proceedings of the annual Water Environment Federation® Technical Exhibition and Conference (WEFTEC® ) and specialty conferences held since the year 2000. These proceedings are not peer reviewed.

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