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DOI: https://doi.org/10.4491/eer.2021.421
Enhanced performance of constructed wetlands by incorporating magnetic Fe3O4 nanoparticles and the effects on the microbial community on the surface of the substrate
Zhou Qingwei1,2,3, and Wu Weihong1
1School Institute of Environmental Materials and Applications, College of Materials and Environmental Engineering, Hangzhou Dianzi University, Hangzhou, Zhejiang 310018, PR China
2School of Environmental Science and Spatial informatics, China University of Mining and Technology, Xuzhou, Jiangsu 221116, PR China
3Zhejiang Huachuan Industrial Group CO. LTD, Yiwu, 322000, PR China
Corresponding Author: Zhou Qingwei ,Tel: +86-18758275070, Fax: +86-571-88809031, Email: zhouqw@hdu.edu.cn
Received: September 3, 2021;  Accepted: November 8, 2021.
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ABSTRACT
Constructed wetlands (CWs) have been successfully employed to treat domestic sewage, while it was reported that inconsistent and low nutrient removal efficiency has been achieved. Due to the good performance in other treatment systems, magnetic Fe3O4 nanoparticles (Fe3O4 NPs) could provide a new pathway for the nutrient removal in CWs. In this study, the influences of Fe3O4 NPs on the nutrient removal and variation of microbial community were investigated. The CWs with Fe3O4 had better NH4+-N (ammonia nitrogen, 95.9%), NO3--N (nitrate nitrogen, 83.8%), and TP (total phosphorus, 90.4%) removal percentages than that without Fe3O4. High-throughput sequencing analysis indicated that the microbial community structure can be changed by Fe3O4 NPs. For example, at class level, the major bacteria such as Betaproteobacteria, Gammaproteobacteria and Deltaproteobacteria were promoted by Fe3O4 NPs. On the other hand, at genus level, some abundant genera disappeared, while other abundant genera became dominant in CWs with Fe3O4 NPs, including Desulfuromonas (3.0%), Azospirillum (1.9%), Chryseolinea (1.5%), and Desulfomicrobium (1.8%). The latter genera essentially improved the microbial community involved in the nitrogen removal. Therefore, the CWs with Fe3O4 NPs showed higher NH4+-N and NO3--N removal percentages than that without Fe3O4 NPs.
Keywords: Constructed wetland | High-throughput sequencing | Magnetic Fe3O4 nanoparticles | Microbial community
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