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Dynamic Modeling of Wet Weather Operations at Blue Plains Advanced Wastewater Treatment Plant

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The District of Columbia's Advanced Wastewater Treatment Plant at Blue Plains is a 370-mgd facility that provides wastewater treatment for over 2 million people in Washington, DC and surrounding jurisdictions in Maryland and Virginia. Blue Plains receives combined sewer flows that originate in the District's combined sewer system. Two separate activated sludge processes provide removal of BOD and nitrogen. The DC Water and Sewer Authority (WASA) is evaluating enhanced nutrient removal options for Blue Plains to meet the future more stringent nutrient limits of the Chesapeake Bay Program. Providing ENR at a combined sewer plant is challenging given the operational changes implemented during wet weather events

This paper focuses on the impact of the wet weather operation on nitrogen removal performance. The plant's biological processes are routinely operated in plug flow mode. When wet weather events are anticipated, the plant converts the secondary and the nitrification/denitrification reactors to step feed modes to avoid solids washout from the clarifiers. A wet weather operation model, using the BIOWIN process model, was developed to simulate the impact of the wet weather operations on total nitrogen removal during a severe storm. Dynamic simulations were used to evaluate the impact of various peaking factors and treatment options for wet weather flows on plant discharge of total nitrogen. The treatment options for combined sewer system storage tunnel pump-out included processing through the complete treatment system and through a new wet weather treatment system
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Document Type: Research Article

Publication date: 2006-01-01

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