Evaluation of denitrification performance and bacterial community of a sequencing batch reactor under intermittent aeration. Issue 2 (28th January 2020)

• Record Type: Journal Article
• Authors: Kwon, Ji Hyeon; Park, Hyung-Joo; Lee, Yun-Yeong; Cho, Kyung-Suk
• Is Part Of: Journal of environmental science and health. Volume 55:Issue 2(2020)
• Page Start: 179
• Page End: 192
• Publication Date: 2020-01-28
• Subjects: Heterotrophic denitrification -- intermittent aeration -- nitrogen removal -- denitrifying bacteria -- sequencing batch reactor; Environmental engineering -- Periodicals; Environmental sciences -- Periodicals; Ecology -- periodicals; Hazardous Substances -- periodicals; 628
• DOI: 10.1080/10934529.2019.1681220
• Languages: English
• ISSNs: 1093-4529

Abstract

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 N2 O 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, N2 O 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.