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자료유형
학술저널
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한국미생물생명공학회 Journal of Microbiology and Biotechnology Journal of Microbiology and Biotechnology 제23권 제1호
발행연도
2013.1
수록면
99 - 105 (7page)

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In this study, nitrous oxide (N2O) emission was compared between the operations of two different sequencing batch reactors, conventional sequencing batch reactor (CNVSBR)and simultaneous nitrification and denitrification sequencing batch reactor (SND-SBR), using synthetic wastewater. The CNV-SBR consisted of anoxic (denitrification)and aerobic phases, whereas the SND-SBR consisted of a microaerobic (low dissolved oxygen concentration) phase,which was achieved by intermittent aeration for simultaneous nitrification and denitrification. The CNV-SBR emitted 3.9 mg of N2O-N in the denitrification phase and 1.6 mg of N2O-N in the nitrification phase, resulting in a total emission of 5.5mg from 432mg of NH4+-N input. In contrast, the SND-SBR emitted 26.2mg of N2O-N under the microaerobic condition, which was about 5 times higher than the emission obtained with the CNV-SBR at the same NH4+-N input. From the N2O yield based on NH4+-N input, the microaerobic condition produced the highest yield (6.1%),followed by the anoxic (0.9%) and aerobic (0.4%) conditions. It is thought that an appropriate dissolved oxygen level is critical for reducing N2O emission during nitrification and denitrification at wastewater treatment plants.

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