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Process Consideration to Achieve Nitrogen Removal in a Moving-Bed Biofilm Reactor

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The Moving Bed Biofilm Reactor (MBBR) technology was determined to be promising and viable option for denitrification to achieve total nitrogen between 3–4 mg N/L and nitrate concentration below 1 mg N/L. A post-denitrifying pilot MBBR system was set up at the Blue Plains AWTP (Advanced Wastewater Treatment Plant) and a bench scale kinetic evaluation was conducted. This study is a compilation of the ex-situ bench evaluations of the media grown in pilot reactor for two reactors in series (R1 and R2). Denitrification kinetics and stoichiometry of MBBR technology using methanol as an external carbon source were investigated. The specific denitrification rates (SDNR) were determined between 1.3 – 2.0 g NOx-N/m2-day and 1.2–1.7 g NOx-N/m2.d for R1 and R2 respectively, and the stoichiometric C:N ratios were 4.6 – 5.8 mg COD/mg NOx-N and 4.4 – 6.1 mg COD/mg NOx-N for R1 and R2 respectively for a temperature range of 13 –18 °C. Experimental values were used to obtain KsNOx-N (effective NOx-N half saturation constant) for different temperatures using a model developed based on the Monod kinetic expression and a spreadsheet interactive search routine. Values of effective KsNOx-N were observed between 0.6 – 2.6 mg N/L for both R1 and R2 for experimental temperatures ranging between 12 and 20 °C.
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Keywords: Biomass Density; Denitrification; Half Saturation Constant; Moving Bed Biofilm Reactor; Specific Denitrification Rate

Document Type: Research Article

Publication date: 2009-01-01

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