title: Characterizing heavy metal build-up on urban road surfaces: implication for stormwater reuse.
abstract: Stormwater reuse is increasingly popular in the worldwide. In terms of urban road stormwater, it commonly contains toxic pollutants such as heavy metals, which could undermine the reuse safety. The research study investigated heavy metal build-up characteristics on urban roads in a typical megacity of South China. The research outcomes show the high variability in heavy metal build-up loads among different urban road sites. The degree of traffic congestion and road surface roughness was found to exert a more significant influence on heavy metal build-up rather than traffic volume. Due to relatively higher heavy metal loads, stormwater from roads with more congested traffic conditions or rougher surfaces might be suitable for low-water-quality required activities while the stormwater from by-pass road sections could be appropriate for relatively high-water-quality required purposes since the stormwater could be relatively less polluted. Based on the research outcomes, a decision-making process for heavy metals based urban road stormwater reuse was proposed. The new finding highlights the importance to undertaking a "fit-for-purpose" road stormwater reuse strategy. Additionally, the research results can also contribute to enhancing stormwater reuse safety.
authors: Research Centre of Environmental Engineering and Management, Graduate School at Shenzhen, Tsinghua University, 518055 Shenzhen, People's Republic of China; Cooperative Research and Education Centre for Environmental Technology, Kyoto University-Tsinghua University, 518055 Shenzhen, People's Republic of China.
authors: An
authors: A
authors: Liu
authors: Research Centre of Environmental Engineering and Management, Graduate School at Shenzhen, Tsinghua University, 518055 Shenzhen, People's Republic of China.
authors: Liang
authors: L
authors: Liu
authors: Research Centre of Environmental Engineering and Management, Graduate School at Shenzhen, Tsinghua University, 518055 Shenzhen, People's Republic of China.
authors: Dunzhu
authors: D
authors: Li
authors: Research Centre of Environmental Engineering and Management, Graduate School at Shenzhen, Tsinghua University, 518055 Shenzhen, People's Republic of China; School of Environment, Tsinghua University, Beijing 100084, People's Republic of China. Electronic address: guanyt@tsinghua.edu.cn.
authors: Yuntao
authors: Y
authors: Guan
mesh_terms: D002681:China; D002947:Cities; D004784:Environmental Monitoring; D019216:Metals, Heavy / Q000032:analysis*; D011891:Rain; D014186:Transportation; D014874:Water Pollutants, Chemical / Q000032:analysis*; D060753:Water Quality
chemical_list: D019216:Metals, Heavy; D014874:Water Pollutants, Chemical
keywords: Ecological risk assessment; Heavy metal build-up; Stormwater pollutant processes; Stormwater quality; Stormwater reuse