Abstract
Due to inefficient removal of microplastics by drinking water treatment process, widely distributed microplastics in drinking water sources may pose risks to drinking water safety. To explore the factors influencing the colonization of bacteria on microplastics and biological risks posed by microplastics in drinking water sources, we exposed microplastics with different sizes and polymer types to water from Yangtze River and Jialing River for 21 days under controlled conditions. High-throughput sequencing and qPCR were conducted to qualitatively and quantitatively analyze the bacterial community on microplastics. The results showed that bacteria tended to adhere to the surfaces of microplastics, resulting in higher community richness and diversity and different community structure on microplastics compared with those in incubation water. The number of bacteria on microplastics increased with decreasing particle size. It was the nature of incubation water rather than microplastics determined the bacterial community structure on microplastics. Some potential pathogens were discovered on microplastics, especially Mycobacterium which accounted for a high proportion. Overall, this study provided an insight into microplastic biofilm and the challenges brought by them in drinking water sources.
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Data Availability
Data that support the findings of this study have been deposited in the National Center for Biotechnology Information (NCBI) Sequence Read Archive (SRA) with the accession number PRJNA715310.
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Acknowledgements
Sampling assistance was provided by National Inland Waterway Regulation Engineering Research Center. Laboratory assistance was provided by Engineering Laboratory of Environmental & Hydraulic Engineering, Chongqing Municipal Development and Reform Commission.
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This work was supported by the Science and Technology Research Program of Chongqing Municipal Education Commission (Grant No. KJQN201900715), and the Foundation of Key Laboratory of Yangtze River Water Environment, Ministry of Education (Tongji University), China (No. YRWEF201903).
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W Yang and Q Li contributed to the study conception and supervision. Experiment was designed and conducted by DH Kou. Material preparation and data collection were performed by YP Hu. Data analysis was performed by YP Hu, W Tang and QK Chen. The first draft of the manuscript was written by Q Li. SS Que, XF Zhao and DQ Zhao commented on previous versions of the manuscript. All authors read and approved the final manuscript.
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Li, Q., Hu, Y., Kou, D. et al. Factors Impacting Microplastic Biofilm Community and Biological Risks Posed by Microplastics in Drinking Water Sources. Water Air Soil Pollut 233, 179 (2022). https://doi.org/10.1007/s11270-022-05649-y
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DOI: https://doi.org/10.1007/s11270-022-05649-y