Long-term effects of silver nanoparticles on performance of phosphorus removal in a laboratory-scale vertical flow constructed wetland

作     者：Juan Huang Jun Xiao Yang Guo Wenzu Guan Chong Cao Chunni Yan Mingyu Wang Juan Huang;Jun Xiao;Yang Guo;Wenzu Guan;Chong Cao;Chunni Yan;Mingyu Wang

作者机构：School of Civil EngineeringSoutheast UniversityNanjing 211189China Security Support Center for Urban Water Supply of Jiangsu ProvinceNanjing 210036China 

出 版 物：《Journal of Environmental Sciences》 (环境科学学报（英文版）)

年 卷 期：2020年第32卷第1期

页      面：319-330页

核心收录：

学科分类：083002[工学-环境工程] 0830[工学-环境科学与工程（可授工学、理学、农学学位）] 08[工学] 

基　　金：supported by the National Natural Science Foundation of China:“The ecological effect and fate of typical nanoparticles in constructed wetland”(No.51479034) the Fundamental Research Funds for the Central Universities(No.2242019K40064) the Graduate Innovation Project of Jiangsu Province(No.KYCX18—0125) 

主　　题：Silver nanoparticles(AgNPs) Phosphorus removal Constructed wetlands Enzymatic activity Microbial community 

摘      要：Silver nanoparticles(AgNPs)have been widely used in many fields,which raised concerns about potential threats to biological sewage treatment *** this study,the phosphorus removal performance,enzymatic activity and microbial population dynamics in constructed wetlands(CWs)were evaluated under a long-term exposure to Ag NPs(0,50,and 200μg/L)for 450 *** have shown that Ag NPs inhibited the phosphorus removal efficiency in a short-term exposure,whereas caused no obviously negative effects from a long-term ***,in the coexisting CW system of Ag NPs and phosphorus,competition exhibited in the initial exposure phase,however,cooperation between them was observed in later *** activity of acid-phosphatase at the moderate temperature(10–20℃)was visibly higher than that at the high temperature(20–30℃)and CWs with Ag NPs addition had no appreciable differences compared with the ***-throughput sequencing results indicated that the microbial richness,diversity and composition of CWs were distinctly affected with the extension of exposure time at different Ag NPs ***,the phosphorus removal performance of CWs did not decline with the decrease of polyphosphate accumulating organisms(PAOs),which also confirmed that adsorption precipitation was the main way of phosphorus removal in *** study suggested that Ag NPs and phosphorus could be removed synergistically in the coexistence *** work has some reference for evaluating the influences of Ag NPs on the phosphorus removal and the interrelation between them in CWs.