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Significant N2O emission from a high rate granular reactor for completely autotrophic nitrogen removal over nitrite
Fang, Fang1; Li, Hanxiang1; Jiang, Xin1; Deng, Xiongwen1; Yan, Peng1; Guo, Jinsong1; Chen, Youpeng1; Yang, Jixiang1,2
2020-07-15
摘要Expanded granular sludge bed (EGSB) reactors were rarely applied for complete ammonium removal over nitrite. In this study, a high ammonium loading rate of 3677 mg N/L/d was achieved in an EGSB reactor. Approximately 5.5-8.5% of influent ammonium was converted to nitrous oxide (N2O) that is a potent greenhouse gas. Moreover, the percentage increased linearly with the increase in ammonium load. A model well matched the reactor dynamics. The model indicated that hydroxylamine (NH2OH) oxidation contributed to over 40% of produced N2O, and denitrification by ammonium oxidizing bacteria contributed to N2O emission significantly. Furthermore, the model suggests that a low oxygen concentration can result in a low N2O emission at the cost of a slightly low ammonium removal rate while influent organic matter play a minor role in reducing N2O emission. This study shows that EGSB reactors are effective in ammonium removal. In addition, the emission of N2O is significant.
关键词Nitrous oxide CANON Mathematical modeling Granular sludge Hydroxylamine oxidation
DOI10.1016/j.jenvman.2020.110586
发表期刊JOURNAL OF ENVIRONMENTAL MANAGEMENT
ISSN0301-4797
卷号266页码:8
通讯作者Fang, Fang(fangfangcq@cqu.edu.cn) ; Yang, Jixiang(jixiang504@hotmail.com)
收录类别SCI
WOS记录号WOS:000531083400032
语种英语