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KMID : 0545120130230010099
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Journal of Microbiology and Biotechnology
2013 Volume.23 No. 1 p.99 ~ p.105
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Effect of Aeration on Nitrous Oxide (N2O) Emission from Nitrogen-Removing Sequencing Batch Reactors
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Kim Dong-Jin
Kim Yu-Ri
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Abstract
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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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KEYWORD
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Denitrification, dissolved oxygen, nitrification, nitrous oxide (N2O) emission, sequencing batch reactor (SBR)
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