Key Laboratory of Urban Stormwater System and Water Environment, Beijing University of Civil Engineering and Architecture, Beijing, 100044, China.
Capital Urban Planning & Design Consulting Development Co., Ltd, Beijing, 100044, China.
Environ Sci Pollut Res Int. 2021 Aug;28(29):38497-38505. doi: 10.1007/s11356-021-13426-3. Epub 2021 Mar 17.
The high pollutants loading of road-deposited sediment (RDS) make it the main threat to receiving water bodies in stormwater management; however, the characteristics of RDS have not yet been sufficiently studied. In this study, samples were collected from three different land-use type areas (campus, residential, and commercial) in Beijing, China, and analyzed for particle size distribution, chemical compositions, and dissolution characteristics. The results revealed that RDS in the sampling sites mainly consisted of particles < 63 μm, which accounted for 40.3%, 30.5%, and 30.3% of the total in samples from campus, residential, and commercial sites, respectively. In addition, the mass percentage of sediments decreased with increasing particle size in all three sampling sites. The highest pollutants loading were mainly found in particles between 125 and 250 μm. The pollutant loading occurred in the following order: commercial > residential > campus for COD and heavy metals (Cr, Cd, Pb, Cu), and campus > residential > commercial for TN, NH-N, and PO-P. The pollutants dissolved capacity (DC) and pollutants dissolved velocity (DV) both decreased with increasing particle size. Overall, the results of this study highlight the importance of removing fine particles to controlling road runoff pollution.
道路沉积物（RDS）的高污染物负荷使其成为雨水管理中受纳水体的主要威胁；然而，RDS 的特性尚未得到充分研究。本研究从中国北京的三个不同土地利用类型区（校园、住宅和商业）采集样本，分析了粒径分布、化学组成和溶解特性。结果表明，采样点的 RDS 主要由<63μm的颗粒组成，分别占校园、住宅和商业采样点总颗粒的 40.3%、30.5%和 30.3%。此外，在所有三个采样点中，沉积物的质量百分比随着粒径的增加而减少。在所有三种采样点中，最高的污染物负荷主要存在于 125-250μm 之间的颗粒中。污染物负荷的顺序为：商业>住宅>校园，对于 COD 和重金属（Cr、Cd、Pb、Cu），而 TN、NH-N 和 PO-P 的顺序为校园>住宅>商业。污染物溶解能力（DC）和污染物溶解速度（DV）都随着粒径的增加而降低。总的来说，本研究的结果强调了去除细颗粒以控制道路径流污染的重要性。
