Microbial Degradation Potential and Transformation Pathway of Micropollutants in Sand Filters of Drinking Water Treatment Plants

被引：0
|
作者：
Zhou J. [1 ,2 ]
Wang D.-L. [1 ,2 ]
Lin H. [1 ,2 ]
Bai Y.-H. [2 ]
机构：
[1] Key Laboratory of Drinking Water Science and Technology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing
[2] College of Resources and Environment, University of Chinese Academy of Sciences, Beijing
来源：
Huanjing Kexue/Environmental Science | 2021年 / 42卷 / 12期
关键词：
Biodegradation pathway; Metagenomic; Microbial community; Micropollutants; Sand filters;
D O I：
10.13227/j.hjkx.202104043
中图分类号：
学科分类号：
摘要：
Sand filters have been widely used in drinking water treatments. Previous studies have demonstrated that sand filters can degrade some micropollutants. However, the degradation pathway and associated microorganisms have not been clearly investigated. Accordingly, in this study, the quartz sands and manganese sands from two drinking water treatment plants were sampled, and their biodegradation genes for four micropollutants (atrazine, atenolol, sulfadiazine, and carbamazepine) and associated microbial strains were analyzed. Metagenomic results showed that the bacterial strains affiliated with Hyphomicrobiaceae in the manganese sand filter and Pseudomonas strains in the quartz sand filter can transform the atrazine into atrazine-2-hydroxy; atenolamide hydrolase of some microorganisms in the two sand filters can transform atenolol into atenolol acid; and monooxygenase, dioxygenase and cytochrome P450, which can oxidize atrazine, sulfadiazine, and carbamazepine, were widely present in the two sand filters. The study further confirmed the biodegradation pathways of these four micropollutants according to the measurements of transformation intermediates in the cultivation experiment. Finally, the study analyzed the biodegradation genes in the other nine sand filters of drinking water treatment plants and found that abundant amidohydrolase, oxygenase, and cytochrome P450 were present in all sand filters, indicating that sand filters have the potential to biodegrade a number of micropollutants. © 2021, Science Press. All right reserved.
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页码：5905 / 5911
页数：6
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