反硝化细菌
硝基螺
化学
人工湿地
单胞菌
环境化学
反硝化
废水
硝化作用
氮气
微生物学
细菌
环境工程
生物
环境科学
假单胞菌
遗传学
有机化学
作者
Xiangyu Yang,Lu Zhang,Yi Chen,Qiang He,Tao Liu,Guoqing Zhang,Ling Yuan,Haoran Peng,Hui Wang,Feng Ju
出处
期刊:Water Research
[Elsevier]
日期:2022-07-01
卷期号:220: 118636-118636
被引量:38
标识
DOI:10.1016/j.watres.2022.118636
摘要
Micro/nano-sized plastics (MPs/NPs) existing in wastewater system are the potential threats to nitrogen (N) biotransformation. Constructed wetlands (CWs) as wastewater treatment systems are considered the important barriers preventing MPs/NPs from entering the open water. However, little is known about how the accumulation of MPs/NPs affects microbial N transformation, dynamics, assembly, and metabolism of wetland microbiota. Herein, we constructed 12 wetland systems to address the above knowledge gaps over 300-day exposure to different sizes (3 mm - 60 nm) and concentrations (10 - 1000 μg/L) of MPs/NPs. The results showed that MPs/NPs accumulation caused decrease in NH4+-N removal (by 7.6% - 71.2%) and microbial diversity and intriguingly altered microbiota composition (especially in the high-concentration groups) without damage on the high removal efficiency of NO3--N and NO2--N (66.2% - 99.8%) in all except for the nano-sized plastic-exposed wetlands. Moreover, MPs/NPs exposure induced shift in the strengths of non-random species aggregation and segregation patterns co-differentiated by the size and concentration of MPs/NPs, and MPs/NPs accumulation created size-differentiated alternative niches for nitrogen-transforming bacteria, e.g., canonical nitrifiers (Nitrospira and Nitrosomonas) and denitrifiers (Thauera, Comamonas, and Aquabacterium), which were enriched in MPs groups where denitrifying enzyme-coding genes were also enriched, suggesting potential positive impact of larger plastics on denitrification. Our study highlights MPs/NPs-induced divergence in microbiota dynamics and nitrogen transformation in CWs, and provides important insights into how microbiota structurally and functionally respond to long-term MPs/NPs disturbance.
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