Back River Wastewater Treatment Plant Enhanced Nutrient Removal

Location: Baltimore, MD

Client: City of Baltimore Department of Public Works

Back River Wastewater Treatment PlantThe Back River Wastewater Treatment Plant is a 180 MGD advanced wastewater treatment facility serving Baltimore City and surrounding counties, and is among the largest treatment facilities in the Chesapeake Bay area.

In the 1990’s, the City upgraded the plant to perform biological nutrient removal (BNR) for nitrogen and phosphorus removal consistent with the original Chesapeake Bay Agreement and the State’s voluntary BNR program. The objective was to meet an effluent goal of 8 mg/L for total nitrogen (TN). The plant was at that time already achieving low effluent total phosphorous levels due to discharge permit requirements for the Plant.

With the State’s Bay Restoration Program for Enhanced Nutrient Removal (ENR) the City is now in the planning stage to further improve the plant’s nitrogen removal to meet an effluent TN objective of 3 mg/L, while maintaining effluent phosphorus levels below the current permit limit of 0.2 mg/L. Whitman, Requardt & Associates, LLP in association with Metcalf & Eddy, Inc./AECOM, CCJM and a number of other sub-consultants, were retained by the City to perform an ENR evaluation for Back River WWTP, and followed by design of selected ENR facility improvements.

CCJM is responsible for conducting a full scale pilot testing program to support the ENR alternatives. The pilot testing program focuses on collecting and developing necessary data and information not currently available at the Back River.

CCJM is also responsible for the HVAC and Plumbing design of the New Denitrification Building, Denitrification Pumping Station, Chemical Building and Backwash Pumping Station.