微塑料
反硝化细菌
聚氯乙烯
磷
氮气
胞外聚合物
放线菌门
拟杆菌
蛋白质细菌
强化生物除磷
细菌
微生物
微生物学
化学
废水
生物膜
反硝化
环境化学
活性污泥
生物
环境工程
生物化学
环境科学
16S核糖体RNA
遗传学
有机化学
基因
作者
Huihui Dai,Jingfeng Gao,Zhiqi Wang,Yifan Zhao,Da‐Lin Zhang
标识
DOI:10.1016/j.jclepro.2020.120402
摘要
Polyvinyl chloride (PVC) is the common microplastics (MPs) detected in wastewater treatment plants causing harmful effects on organisms. However, the effects of PVC MPs on an aerobic granular sludge (AGS) system is not clear. In present study, the behavior of nitrogen, phosphorus and antibiotic resistance genes (ARGs) under PVC MPs pressure in an AGS system was investigated. Results showed PVC MPs promoted the phosphorus release and uptake of polyphosphate accumulating organisms (PAOs) and reduced total inorganic nitrogen removal efficiency. Extracellular polymeric substances were positively linked to PVC MPs. Moreover, PVC MPs increased the abundance of PAOs and Nitrospira, but decreased the abundance of denitrifying bacteria. The propagation of intI1 and tetE could be facilitated by PVC MPs, and the main antibiotic resistance mechanism of AGS system was the efflux pump. Chloroffexi, Actinobacteria, Bacteroidetes and Nitrospirae hold higher tolerance to PVC MPs than Proteobacteria. Network analysis showed PVC MPs positively correlated with some Accumulibacter clades and ARGs. This study indicated PVC MPs inhibited nitrogen removal and benefited ARGs propagation, which need to cause great concern.
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