微塑料
胞外聚合物
毒性
化学
环境化学
微生物种群生物学
废水
污水处理
急性毒性
氮气
环丙沙星
污染
抗生素
细菌
生物
生态学
环境科学
环境工程
生物膜
生物化学
有机化学
遗传学
作者
Yuqi Li,Bai-Hang Zhao,Yuqing Zhang,Xinyue Zhang,Xiao-Tang Chen,Haishan Yang
标识
DOI:10.1016/j.envres.2023.117151
摘要
Copper oxide nanoparticles (CuO NPs) and ciprofloxacin (CIP) have ecological risk to humans and ecosystems. Polyvinylchloride microplastics (PVC MPs), as a representative of microplastics, may often coexist with CuO NPs and CIP in wastewater treatment systems due to their widespread application. However, the co-impact of PVC MPs in wastewater systems contained with CuO NPs and CIP on nitrogen removal and ecological risk is not clear. In this work, PVC MPs co-impacts on the toxicity of CuO NPs and CIP to aerobic granular sludge (AGS) systems and potential mechanisms were investigated. 10 mg/L PVC MPs co-addition did not significantly affect the nitrogen removal, but it definitely changed the microbial community structure and enhanced the propagation and horizontal transfer of antibiotics resistance genes (ARGs). 100 mg/L PVC MPs co-addition resulted in a raise of CuO NP toxicity to the AGS system, but reduced the co-toxicity of CuO NPs and CIP and ARGs expression. The co-impacts with different PVC MPs concentration influenced Cu2+ concentrations, cell membrane integrity, extracellular polymeric substances (EPS) contents and microbial communities in AGS systems, and lead to a change of nitrogen removal.
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