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DOI: https://doi.org/10.4491/eer.2019.425
Insight on the microbial activity and microbiome in partial nitrification systems: CuO nanoparticles impact under different pH levels
Xiaojing Zhang1, Nan Zhang1, Yue Zhou1, Robert Delatolla2, Yali Song1, Yongpeng Ma1, and Hongzhong Zhang1
1Henan Collaborative Innovation Center of Environmental Pollution Control and Ecological Restoration; Henan Engineering Research Center of Chemical Engineering Separation Process Intensification, Zhengzhou University of Light Industry, Zhengzhou 450001, Ch
2Department of Civil Engineering, University of Ottawa, Ontario, K1N6N5, Canada
Corresponding Author: Xiaojing Zhang ,Tel: +86 15237133016 , Fax: +86 037186608770, Email: zhangxiaojing@zzuli.edu.cn
Received: October 16, 2019;  Accepted: January 5, 2020.
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ABSTRACT
In this study, the effect of CuO nanoparticles (NPs) on partial nitrification (PN) process was investigated at various pH values. The short- and long-term experiments were carried out in six identical reactors, with or without CuO NPs, at pH values of 6.5, 8.0 and 10.0. The ammonia oxidation, reaction rates, copper content, and the microbial community were investigated. The results of this work suggested that CuO NPs inhibited the ammonia oxidation by aerobic ammonia-oxidizing bacteria (AOB), under both the acid and alkali conditions. AOB could resist the acid condition but was significantly suppressed when CuO NPs was fed, and the low pH did not aggravate the inhibition level. Almost all the bacteria lost bioactivity under the pH as 10.0, while anaerobic ammonia-oxidizing bacteria survived. The acid condition increased the Nitrosomonas relative abundance while the alkali condition lowered it. More than 60% of the supplied CuO NPs was discharged via effluent.
Keywords: AOB | CuO NPs | Nitrogen removal | Partial nitrification | pH
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