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Kinetic/Half-saturation Coefficient Considerations for Post Denitrification MBBR

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To better understand the robustness of MBBR post denitrification process to achieve very low level of NOx-N < 1 mg/L, pilot was implemented at the Blue Plains AWTP. It was important to understand the limitations of the substrate, expressed as Ks (half-saturation coefficient) on the overall denitrification rates. Total of four 100-gallon anoxic pilot reactors were used for this testing. SDNR was estimated by measuring the rate of consumption of NOx-N over time. At an ambient temperature of 17°C, Ks,NOx-N (Ks for nitrate limited test) was 2.5 mg/L on average, and Ks,bsCOD (Ks for bsCOD limited test) was 6.5 mg/L. Ks,NOx-N remained fairly constant during the cold temperature period (13.5°C) while Ks,bsCOD concentration was not a definitive finding. Insitu SDNR data were used to develop a model for the MBBR system, based on the double Monod relationship. Half-saturation coefficient was found to be a very important design consideration for fixed film polishing application.

Keywords: ENR; Half-saturation; Kinetic Limitation; Limit of Technology (LOT); Moving Bed Biofilm Reactor (MBBR); Post Denitrification

Document Type: Research Article


Publication date: 2009-01-01

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