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Side-by-Side Pilot-Scale Comparison of IFAS and MBBR Processes Operated at Varying DO Conditions

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The current study conducted a side-by-side evaluation of single-stage IFAS and MBBR processes for concomitant carbon oxidation and nitrification of a primary effluent. Both processes were compared as a function of DO, temperature, and pollutant loading rate. Of particular interest, the study sought to identify the lowest residual DO concentration that supported effective nitrification in the presence of organic carbon. Throughout the study, median percent ammonium removal was 90% and 70% for IFAS and MBBR processes, respectively. For both pilots, ammonium removal rates increased with increasing DO; however, as the ammonium loading rate was decreased, the dependence of nitrification rates on residual DO was dampened. As residual DO concentrations decreased, the IFAS reactor evidenced improved performance when compared to the MBBR.

Keywords: IFAS; MBBR; nitrification; oxygen limitation; suspended carrier reactor

Document Type: Research Article


Publication date: 2011-01-01

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