Enhanced narH gene expression contributing to nitrite accumulation in simultaneous nitrification and denitrification under Na plus stress instead of K plus stress
文献类型： 外文期刊
作者： Jiang, Xiaomei 1 ; Wang, Hong 2 ; Wu, Peike 1 ; Lei, Yunhui 1 ; Deng, Liangwei 1 ; Wang, Wenguo 1 ;
作者机构： 1.Minist Agr & Rural Affairs, Biogas Inst, Chengdu 610041, Peoples R China
2.Chinese Acad Agr Sci, Inst Urban Agr, Chengdu 610213, Peoples R China
3.Minist Agr & Rural Affairs, Key Lab Dev & Applicat Rural Renewable Energy, Chengdu 610041, Peoples R China
关键词： Simultaneous nitrification and denitrification; Ion stress; Nitrite accumulation; Microbial community
期刊名称：CHEMICAL ENGINEERING JOURNAL （ 影响因子：15.1； 五年影响因子：14.3 ）
ISSN： 1385-8947
年卷期： 2024 年 479 卷
页码：
收录情况： SCI
摘要： High salinity has attracted much attention because of its serious effects on functional microorganisms during wastewater treatment. Most of the research on salt stress has investigated the impacts on individual nitrification or denitrification by controlling the total salinity of wastewater. However, the effects and mechanisms of the ion composition on simultaneous nitrification and denitrification (SND) are poorly understood under salt stress. Na+ and K+ are important components of salt stress because of their high contents and difficult removal characteristics from wastewater. This study systematically investigated the individual and combined effects of Na+ and K+ on SND using continuous tests with the increasing salinity. Compared with the control, K+ and combined stresses had no effects on nitrogen transformation and removal within 2.86% salinity. However, Na+ stress decreased ammonia nitrogen (NH4+-N) removal and caused the serious nitrite nitrogen (NO2--N) accumulation at 2.36% and 2.86% salinities. Moreover, Na+ stress significantly enhanced narH expression and the relative abundance of denitrifying bacteria, especially Ottowia at 2.86% salinity. Na+ stress results in an out -of -synch problem between NO2--N production and consumption by destroying the balance of the bacterial community. This study indicates that Na+ concentration and accumulation should be considered in the SND for nitrogen removal.
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