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Modeling and Implementation of Flocculation Zones in Rectangular Final Settling Tanks at the Newtown Creek Water Pollution Control Plant

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The Newtown Creek Water Pollution Control Plant (WPCP), designed for 310 MGD average daily flow (ADF), is one of fourteen WPCPs owned and operated by the New York City Department of Environmental Protection (NYCDEP). The facility, which is the only NYCDEP plant operating without Primary Settling Tanks, is currently undergoing a plant-wide upgrade that includes increasing the biological treatment facilities by 50% (from two to three batteries) and changing the process from High Rate Modified Conventional Activated Sludge operation to Low Solids Retention Time (SRT) (1.8 – 2.2 days) Step Feed Activated Sludge operation. The plant is currently operating under an interim permit with new secondary treatment permit limits scheduled to go into effect at the conclusion of construction. A demonstration program was initiated in two existing test tanks to optimize dry and wet weather operating strategies and the operation of the flocculation zones that were installed at the head end of the final settling tanks. The flocculation zones were added because the plant had experienced previous bioflocculation problems: Flocculated Suspended Solids (FSS) results significantly below Dispersed Suspended Solids (DSS) results). In order to evaluate the performance of the test tanks, they were constructed in a way that isolated them from the existing plant. Additionally, a state-of-the-art Computational Fluid Dynamics (CFD) model was used to test the effectiveness of the flocculation zones in the Final Settling Tanks, and to optimize their design.

Document Type: Research Article


Publication date: January 1, 2008

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