Evaluation of denitrification performance and bacterial community of a sequencing batch reactor under intermittent aeration

Ji Hyeon Kwon, Hyung Joo Park, Yun Yeong Lee, Kyung Suk Cho

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

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.

Original languageEnglish
Pages (from-to)179-192
Number of pages14
JournalJournal of Environmental Science and Health - Part A Toxic/Hazardous Substances and Environmental Engineering
Volume55
Issue number2
DOIs
StatePublished - 28 Jan 2020

Keywords

  • denitrifying bacteria
  • Heterotrophic denitrification
  • intermittent aeration
  • nitrogen removal
  • sequencing batch reactor

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