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Design and Commissioning of Calgary's New State-of-the-Art Biological Nutrient Removal WWTP

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The City of Calgary's new Pine Creek WWTP represents the culmination of 30 years of experience in the design and operation of BNR facilities in Western Canada. The process design incorporates several novel design features, including primary sludge fermentation, primary effluent step-feeding, wet weather flow bypassing, swing zones, and mixed liquor surface wasting. The liquid and solids treatment streams were successfully commissioned over an 18 month period starting in the fall of 2008. Results from the first 2 years of plant operation indicate that, with primary sludge fermentation, the plant is capable of reliably meeting its target effluent total P concentration of <0.3 mg/L without supplemental chemical addition. Meeting this effluent quality objective without primary sludge fermentation required in-plant alum addition at an average dosage of 50 mg/L during the first year of operation.

Keywords: Biological nutrient removal; enhanced biological phosphorus removal (EBPR); in-plant alum addition; primary sludge fermentation; start-up and commissioning

Document Type: Research Article


Publication date: 2011-01-01

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