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Enhanced Nutrient Removal Upgrade of the Winebrenner Wastewater Treatment Plant Using BioMag™ Technology

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Upgrading municipal wastewater treatment plants in the Chesapeake Bay region to achieve enhanced nutrient removal (ENR) annual limits of 4 mg/l total nitrogen (TN) concurrently with 0.3 mg/l total phosphorus (TP) has created a demand for innovative and cost- effective treatment technologies. BioMag™ ballasted activated sludge technology utilizes magnetite as ballast, enabling reactors to operate at high mixed liquor (MLSS) concentrations and rapidly settle the floc with a high ballast recovery percentage. A pilot test was conducted to assess its feasibility to achieve ENR without effluent filters. The Four-Stage Bardenpho Process with BioMag™ technology was operated for varying influent loading conditions at a MLSS concentration of 10,000 mg/L between 6 – 11°C, achieving TN <3 mg/L, TP < 0.2 mg/L and total suspended solids < 5 mg/L without effluent filters. By contrast, modeling results indicate using a MLSS concentration of 3,000 mg/L without magnetite would not have achieved ENR.

Keywords: Activated Sludge; Ballast; Nutrient Removal; Secondary Clarifier

Document Type: Research Article


Publication date: January 1, 2011

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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 These proceedings are not peer reviewed.

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