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Reaching the Limits of Combined N & P removal in a Single Sludge System

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In Biological Nutrient Removal (BNR) plants designed for combined Nitrogen and Phosphorus (N & P) removal, often one nutrient competes with the other for organic carbon, which may result in less than optimal removal of both nutrients. However, a step feed process configuration at the Westside Regional WWTP (WRWWTP) in British Columbia, Canada has been demonstrated to achieve excellent combined N & P removal with the expectation that even lower limits can be achieved in the future with minor refinements to the treatment process. This process configuration is referred to as the ;amp;#x201C;Westbank” process and the flow sheet is illustrated in Figure 1.

Keywords: Aerobic Decay Rate; Aerobic Zone; Anoxic Decay Rate; Anoxic Zone; Biological Phosphorus Removal; Nitrogen Removal; Pre-Anoxic Zone, Anaerobic; Primary Sludge Fermentation; Secondary Clarifier Operation; Step Feed Primary Effluent; VFA; Zone

Document Type: Research Article


Publication date: 2009-01-01

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