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Yuepeng Sun,Liwei Xin,Guangxue Wu,Yuntao Guan 대한환경공학회 2019 Environmental Engineering Research Vol.24 No.1
Nitrogen removal, nitrous oxide (N₂O) emission and microbial community in sequencing batch and continuous-flow intermittent aeration processes were investigated. Two sequencing batch reactors (SBRs) and two continuous-flow multiple anoxic and aerobic reactors (CMRs) were operated under high dissolved oxygen (DO) (SBR-H and CMR-H) and low DO (SBR-L and CMR-L) concentrations, respectively. Nitrogen removal was enhanced under CMR and low DO conditions (CMR-L). The highest total inorganic nitrogen removal efficiency of 91.5% was achieved. Higher nitrifying and denitrifying activities in SBRs were observed. CMRs possessed higher N₂O emission factors during nitrification in the presence of organics, with the highest N₂O emission factor of 60.7% in CMR-L. SBR and low DO conditions promoted N₂O emission during denitrification. CMR systems had higher microbial diversity. Candidatus Accumulibacter, Nitrosomonadaceae and putative denitrifiers (N₂O reducers and producers) were responsible for N₂O emission.