School of Environment, Harbin Institute of Technology, Harbin 150090, China; School of Environmental Science and Engineering, Southern University of Science and Technology, Shenzhen 518055, China.
School of Environmental Science and Engineering, Southern University of Science and Technology, Shenzhen 518055, China; Shenzhen Municipal Engineering Lab of Environmental IoT Technologies, Southern University of Science and Technology, Shenzhen 518055, China.
J Hazard Mater. 2021 Jun 5;411:125047. doi: 10.1016/j.jhazmat.2021.125047. Epub 2021 Jan 6.
Parabens are preservatives widely used in pharmaceutical and personal care products (PPCPs). This study investigated urban water pollution by parabens from a watershed perspective. Water and sediment samples were collected from one of the most polluted urban streams in China. Six parabens and five paraben metabolites were frequently detected in the samples, whereas the overall pollution level was intermediate according to a global comparison. The spatial distributions of the chemical concentrations along the river are influenced by multiple factors, and WWTPs appear to be a major factor. In general, the target pollutants were detected at higher concentrations in the dry season than in the wet season, but extraordinary concentration peaks in water were observed downstream of wastewater treatment plants (WWTPs), indicating a dominant contribution from combined sewage overflows (CSOs) during rainfall events. In a representative WWTP-influenced reach, CSOs account for its 97.3% of ∑parabens input and 96.9% of ∑metabolites input in a typical rainfall event. Converting the existing combined sewer systems to separate stormwater drainage systems could reduce the inputs of ∑parabens and ∑metabolites by 86.9-84.5%, respectively. This study highlights the role of urban drainage systems in preventing surface water pollution by PPCPs. CAPSULE: Urban drainage systems play a critical role in controlling pollution by parabens and their metabolites in urban surface water.
防腐剂被广泛应用于医药和个人护理产品（PPCPs）中。本研究从流域角度调查了城市水中的防腐剂污染。从中国污染最严重的城市河流之一采集了水样和沉积物样本。在样本中经常检测到六种防腐剂和五种防腐剂代谢物，而根据全球比较，整体污染水平处于中等水平。化学浓度沿河流的空间分布受多种因素影响，而污水处理厂（WWTP）似乎是一个主要因素。总的来说，目标污染物在旱季的浓度高于雨季，但在污水处理厂下游的水体中观察到异常高的浓度峰值，表明在降雨事件中，合流污水溢流（CSO）的贡献很大。在受代表性 WWTP 影响的河段中，在典型降雨事件中，CSO 占∑防腐剂输入的 97.3%和∑代谢物输入的 96.9%。将现有的合流制污水系统改为单独的雨水排水系统，可以分别将∑防腐剂和∑代谢物的输入减少 86.9-84.5%。本研究强调了城市排水系统在控制城市地表水中 PPCPs 污染方面的作用。
