Su Du, Ben Weiwei, Strobel Bjarne W, Qiang Zhimin
Key Laboratory of Drinking Water Science and Technology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, 18 Shuang-qing Road, Beijing 100085, China; Department of Plant and Environmental Sciences, University of Copenhagen, Thorvaldsensvej 40, DK-1871 Frederiksberg C, Denmark; Sino-Danish Center for Education and Research (SDC), Beijing 100190, China; Sino-Danish College, University of Chinese Academy of Sciences, Beijing 100190, China.
Key Laboratory of Drinking Water Science and Technology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, 18 Shuang-qing Road, Beijing 100085, China.
J Hazard Mater. 2021 Mar 15;406:124331. doi: 10.1016/j.jhazmat.2020.124331. Epub 2020 Oct 26.
Upgrades of wastewater treatment plant (WWTP) and full-scale application of additional advanced oxidation processes have been proven to be effective in reducing the nutrient emissions to the environment; however, the impacts of WWTP upgrades on the receiving waters with regard to the occurrence and ecological risks of pharmaceuticals are still unclear. In this study, 27 pharmaceuticals with diverse physicochemical properties were monitored in four rivers in Beijing, each of which was heavily impacted by a large-scale WWTP. Three-year sampling campaigns were conducted, covering the periods before and after the WWTP upgrades. The results show that the newly added combined treatment processes (e.g., biological filter, ultrafiltration, ozonation, and NaClO disinfection) reduced the total pharmaceutical concentrations in the effluents by 45-74%. The composition profiles reveal that the upgrades of two studied WWTPs resulted in a significant reduction of pharmaceutical concentrations in the receiving rivers, while little impacts were observed for the other rivers. The risk assessment shows that the acute toxic pressures in the studied rivers were generally low and the WWTP upgrades were conducive to reduce the risks for most of pharmaceuticals. However, erythromycin and ofloxacin still posed high risk, indicating the potential adverse effect of pharmaceuticals on aquatic environment.
污水处理厂（WWTP）的升级以及额外高级氧化工艺的全面应用已被证明在减少向环境排放营养物质方面是有效的；然而，污水处理厂升级对受纳水体中药物的存在情况和生态风险的影响仍不明确。在本研究中，对北京四条河流中的27种具有不同理化性质的药物进行了监测，每条河流都受到一座大型污水处理厂的严重影响。开展了为期三年的采样活动，涵盖了污水处理厂升级前后的时间段。结果表明，新增加的联合处理工艺（如生物滤池、超滤、臭氧化和次氯酸钠消毒）使出水的总药物浓度降低了45%-74%。成分分析表明，两座研究中的污水处理厂的升级导致受纳河流中药物浓度显著降低，而其他河流几乎未观察到影响。风险评估表明，研究河流中的急性毒性压力总体较低，污水处理厂升级有利于降低大多数药物的风险。然而，红霉素和氧氟沙星仍然具有高风险，表明药物对水生环境存在潜在不利影响。
