Online N2O measurement: the next standard for controlling biological ammonia oxidation?
Online N2O measurement: the next standard for controlling biological ammonia oxidation?
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DOI：
10.1021/es402971p
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发表时间：
2013-08
影响因子：
11.4
通讯作者：
Pascal Wunderlin;H. Siegrist;A. Joss
中科院分区：
文献类型：
--
作者：
Pascal Wunderlin;H. Siegrist;A. Joss
N2O formation during biological wastewater treatment is complex because it is produced via different pathways and influenced by many factors. At an earlier stage of the research, heterotrophic denitrifiers were considered the dominant N2O producers, a situation which changed substantially in recent years, the focus having moved to ammonia-oxidizing bacteria (AOB). The latter can generate N2O via (so far) two different pathways: (i) by reducing nitrite (NO2 −), and (ii) via intermediates formed during the oxidation of hydroxylamine (NH2OH) to NO2 −, known as nitrifier denitrification and NH2OH oxidation, respectively. Nitrification was recently proposed to be the dominant N2O source in full-scale biological wastewater treatment, which is mainly attributed to suboptimal process operating conditions, such as the accumulation of NO2 −, the presence of low concentrations of dissolved oxygen or peak ammonia loads. Monitoring N2O off-gas concentrations combined with a better understanding of its dynamics and triggers is consequently helpful for improved AOB process control.
