Kinetic/Half-saturation Coefficient Considerations for Post Denitrification MBBR
Abstract: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.
Document Type: Research Article
Publication date: January 1, 2009
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