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.
Research Centre of Environmental Engineering and Management, Graduate School at Shenzhen, Tsinghua University, 518055 Shenzhen, People's Republic of China.
Sci Total Environ. 2015 May 15;515-516:20-9. doi: 10.1016/j.scitotenv.2015.02.026. Epub 2015 Feb 14.
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.
雨水再利用在全球范围内越来越受欢迎。就城市道路雨水而言，它通常含有重金属等有毒污染物，这可能会破坏再利用的安全性。本研究调查了中国南方一个典型特大城市中城市道路上重金属的积累特征。研究结果表明，不同城市道路地点的重金属积累负荷具有很高的可变性。研究发现，交通拥堵程度和路面粗糙度对重金属积累的影响比交通量更大。由于重金属负荷相对较高，交通条件较拥堵或路面较粗糙的道路上的雨水可能适合低水质要求的活动，而从支路收集的雨水则适合水质要求较高的目的，因为这些雨水的污染程度相对较低。基于研究结果，提出了一种基于重金属的城市道路雨水再利用决策过程。这一新发现强调了采取“因地制宜”的道路雨水再利用策略的重要性。此外，研究结果还可以有助于提高雨水再利用的安全性。
