Abstract
In this study, two S0 particle packed reactors were constructed to explore the influence of alkalinity content on S0-based autotrophic denitrification (SAD) with nitrate and nitrite as electron acceptors respectively. As a result of the comparative experiment, when the alkalinity of influent is sufficient (HCO3 -: NO3 - mole ratio > 1.5:1), NO3 --N and NO2 --N reactor both showed high removal efficiency. But when the HCO3 -: NO3 - mole ratio decreased to 0.2:1, the average removal rate of NO3 --N decreased to 31%, and NO2 --N average removal rate still maintained at 95%. Based on the results, the reduction of alkalinity can significantly reduce the nitrate removal efficiency, but has little effect on the nitrite removal efficiency. This study further explained the characteristics of alkalinity consumption of the two stage of SAD and may provide a reference for future research.
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