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  • Title: Evaluation of denitrification performance and bacterial community of a sequencing batch reactor under intermittent aeration.
    Author: Kwon JH, Park HJ, Lee YY, Cho KS.
    Journal: J Environ Sci Health A Tox Hazard Subst Environ Eng; 2020; 55(2):179-192. PubMed ID: 31656118.
    Abstract:
    Effects of operational parameters (initial nitrite concentration, initial nitrate concentration, carbon source, and COD/N ratio) on denitrification performance was evaluated using a sequencing batch reactor (SBR) under intermittent aeration. Complete denitrification was observed without N2O accumulation when the initial nitrite concentration was 100-500 mg-N·L-1. When the initial nitrate concentration was 75-300 mg-N·L-1, 95-96% of NO3--N was completely reduced to N2 gas. Acetate was the most effective sole carbon source for the complete denitrification of the SBR under intermittent aeration, and 99% of NO3--N was reduced to N2 gas. The optimum COD/N ratio was 8-12 for the complete denitrification, while NO2- accumulation was observed at low COD/N ratios of 1 and 2. In this study, N2O accumulation was not observed during the denitrification process regardless of operational condition. Paracoccus (15-68%), a representative aerobic denitrifying bacterium, was dominant in the SBR during the denitrification process, and the intermittent aeration condition could affect the abundance of Paracoccus in this study.
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