Abstract
There is a need to develop low operational intensity, cost-effective, and small-footprint systems to treat wastewater. Partial nitritation has been studied using a variety of control strategies, however, a gap in passive operation is evident. This research investigates the use of elevated loading rates as a strategy for achieving low operational intensity partial nitritation in a moving bed biofilm reactor (MBBR) system. The effects of loading rates on nitrification kinetics and biofilm characteristics were determined at elevated, steady dissolved oxygen concentrations between 5.5 and 7.0mg O2/L and ambient temperatures between 19 and 21°C. Four elevated loading rates (3, 4, 5 and 6.5g NH4+-N/m2days) were tested with a distinct shift in kinetics being observed towards nitritation at elevated loadings. Complete partial nitritation (100% nitrite production) was achieved at 6.5g NH4+-N/m2days, likely due to thick biofilm (572µm) and elevated NH4+-N load, which resulted in suppression of nitrite oxidation.
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