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Pilot Testing of Two-Sludge ENR Systems, Success Despite Murphy

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The State of Maryland, acting to improve the health of Chesapeake Bay under the Chesapeake Bay Program, has initiated the Enhanced Nutrient Removal (ENR) Program to reduce the discharge of nutrients to The Chesapeake Bay. The Patapsco Wastewater Treatment Plant (Patapsco), located in the City of Baltimore, Maryland, is currently in the planning and design stages of a nutrient removal project that includes the upgrade of the facility from secondary treatment limits with no nitrogen removal technology to ENR levels (3 mg/L total nitrogen and 0.3 mg/L total phosphorus, annual average). As part of the preliminary design of the upgrade a one year pilot study was conducted to evaluate potential ENR designs.

The pilot studies provided operating data for two approaches to ENR at Patapsco, a two-sludge activated sludge system and a two stage process with activated sludge followed by fixed film nitrification and denitrification. More importantly the pilot study provided numerous lessons in conducting pilot testing programs and in planning and dealing with unknown issues and challenges that affect pilot plant performance.

Document Type: Research Article


Publication date: January 1, 2005

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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 These proceedings are not peer reviewed.

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