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Beyond Desktop Evaluation: Key Design Criteria for Mixing and Settling of Magnetite-Impregnated Mixed Liquor

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The Mystic Water Pollution Control Facility (WPCF) in Stonington, Connecticut is in need of a process upgrade to meet future requirements for effluent total nitrogen. The plant layout does not allow for conventional expansion and requires implementation of a biological process option that provides a high level of treatment in a constrained site. A desktop evaluation of small-footprint alternatives indicated that the BioMag process was the most space-efficient, cost-effective and sustainable option for implementation at the Mystic WPCF. A full-scale demonstration of the BioMag process was completed from September 2009 through January 2010 to verify achievement of required process performance and to test the impacts of magnetite-impregnated mixed liquor on settling, re-suspension and other mechanical aspects of successful treatment.
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Keywords: BioMag; activated sludge; ballasted biological treatment; magnetite; nitrogen removal

Document Type: Research Article

Publication date: 2011-01-01

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