反硝化细菌
反硝化
化学
环境化学
硝酸盐
锌
氮气
活性污泥
废水
环境工程
动物科学
生物
环境科学
有机化学
作者
Ya-Fei Cheng,Guifeng Li,Yingyi Liu,Bing-Qian Zhu,Qian Zhang,Yuan Xue,Zheng-Zhe Zhang,Ren‐Cun Jin
标识
DOI:10.1016/j.biortech.2019.02.005
摘要
High-rate denitrification is a popular and efficient process for treatment of nitrate-rich wastewater. Knowing the effect of heavy metals on denitrification is essential for industrial development. In the present study, the long-term impacts of Zn(II) on denitrifying granular sludge were investigated. The suppression threshold of Zn(II) on denitrifying bacteria was 10 mg L-1 for long-term exposure. The nitrogen removal rate was decreased by long-term addition of 10 mg L-1 Zn(II). Castellaniella and Klebsiella were the two dominant genera under Zn(II) stress. The relative abundance of Klebsiella sharply decreased to 4.64% after the addition of 10 mg L-1 Zn(II), whereas Castellaniella was susceptible to 2 mg L-1 Zn(II), revealing that Castellaniella mainly was devoted to denitrification under no or low Zn(II) stress conditions, whereas Klebsiella was effective under high Zn(II) stress.
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