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Emerging Technologies Nitrogen and Phosphorus Removal Westbank Process Objective: Enhanced removal of phosphorus and nitrogen from wastewater. Description: March 2013 updated 2008 Technology Summary State of Development: Adaptive Use. The Westbank Process is a version of the Three-Stage Bardenpho® but includes Returned Activated Sludge (RAS) denitrification to provide efficient phosphate and nitrogen removal. First, RAS is subjected to an anoxic stage to remove nitrates. While a fraction of the influent wastewater is sent to the anoxic reactor, the remaining portion is fed to the anaerobic reactor directly. There is also an internal recycle from the oxic reactor to the second-stage anoxic reactor. Comparison to Established Technologies: In the basic Three-Stage Bardenpho® process, the oxic reactor is in tandem with the anaerobic and anoxic reactors. RAS is returned to the anaerobic reactor and there is an internal recirculation from the oxic reactor to the anoxic reactor. The Westbank Process includes the anaerobic reactor sandwiched between the two anoxic reactors, with the oxic reactor downstream of the three stages. Available Cost Information: Approximate Capital and O&M Costs: Cost estimates are dependent upon local requirements and specific application and economy of scale applies. For example, uniform annual cost of a 100,000 GPD plant is estimated about $272,075 based on an interest rate of 6% for a 20-year period. Vendor Name(s): Installation(s): N/A Used in Kelowna WWTP, British Columbia, Canada Key Words for Internet Search: Westbank process, BNR, biological nutrient removal Data Sources: “Design and Retrofit of Wastewater Treatment Plants for Biological Nutrient Removal,” Water Quality Management Library, Volume 5, Second Edition, 1998. Principles and Practice of Nutrient Removal from Municipal Wastewater, Lewis Publishers, Second Edition, 1991. Process Flow Diagram for the Westbank Process 3-30 Wastewater Treatment and In-Plant Wet Weather ManagementPDF Image | Emerging Tech for Wastewater Treatment
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