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Design and Operating Considerations for a Post Denitrification MBBR to Achieve Limit of Technology Effluent NOx < 1 mg/l and Effluent TP<0.18 mg/l

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Denitrifying Moving Bed Biofilm Reactor (MBBR) technology has been attracting increasing interest over the past decade because of its mechanical simplicity, ease of maintenance and reportedly reliable nutrient removal performance even under cold wet weather operating conditions. This technology has not however been demonstrated to be capable of consistently achieving limit of technology (LOT) total nitrogen (TN) and total phosphorus (TP) effluent goals such as those required by some dischargers in the Chesapeake Bay, i.e. TN<3 mg/l and TP<0.18 mg/l. In an effort to determine if a post denitrification MBBR polishing process may be a cost effective and reliable add-on treatment technology to achieve its' future Enhanced Nutrient Removal (ENR) effluent goals (effluent NOx of between 0.5 and 1 mg/l, and TP <0.18 mg/l), the District of Columbia Water and Sewer Authority (DC WASA) operated a pilot scale denitrifying MBBR process for a 6 month period to examine its performance over a range of design & operating conditions. This paper will review the results of that study and report on the design and operating considerations developed for the successful implementation of a LOT post denitrification MBBR Process.
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Keywords: Biomass Density Measurements; Design criteria; Enhanced Nutrient Removal (ENR); Limit of Technology (LOT); Nitrate and Carbon Half Saturation Coefficients; Phosphorus Limitations; Post Denitrification Moving Bed Biofilm Reactor (MBBR)

Document Type: Research Article

Publication date: 2009-01-01

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