Marine Environmental Research Center, Korea Institute of Ocean Science and Technology (KIOST), Busan, 49111, Republic of Korea; Department of Ocean Science (Oceanography), KIOST School, University of Science and Technology (UST), Daejeon, 34113, Republic of Korea.
Marine Environmental Research Center, Korea Institute of Ocean Science and Technology (KIOST), Busan, 49111, Republic of Korea.
Environ Pollut. 2020 Oct;265(Pt A):115028. doi: 10.1016/j.envpol.2020.115028. Epub 2020 Jun 20.
Understanding the relationship between road-deposited sediments (RDS) and total suspended solids (TSS) is essential for managing non-point pollution. Studying the heavy metal concentrations of RDS and TSS in rainfall is important to the development of RDS management strategies and to the design of effective stormwater management practices. We investigated the heavy metal (V, Cr, Mn, Co, Ni, Cu, Zn, As, Mo, Cd, Sn, Pb) in RDS and TSS in rainfall runoff to assess the metal pollution level and to evaluate the contribution of RDS heavy metal pollution in the TSS. The heavy metal pollution in RDS and TSS in industrial areas was relatively higher in small particles (<125 μm), while TSS had a higher heavy metal concentration than RDS. In addition, the concentration of heavy metals in TSS increased rapidly during the initial rainfall. The amount of particles larger than 125 μm also increased, suggesting that large metal particles accumulated in industrial areas were also discharged in the form of non-point pollution. The amount of RDS per unit of industrial area (g/m) and the accumulation of heavy metals (Pb, Cu, and Zn) (mg/m) were 15- and 8-54-fold higher than those of urban areas, respectively. Considering particles <125 μm, which can be easily transported or discharged during rainfall, the contribution rate of RDS to TSS was 41.3%, but the average contribution rate to heavy metals in TSS was 22.1%. The average load of heavy metals from industrial areas in TSS was 77.9%. The load of Cu, Ni, As, Cd, and Sn exceeded 90%, indicating that most of these metals were attributed to industrial activities related to metal processing. Our results suggest the importance of efficient road cleaning and rainfall runoff management strategies to solve the heavy metal pollution problem caused by non-point sources in industrial areas.
了解道路沉积物（RDS）和总悬浮固体（TSS）之间的关系对于管理非点源污染至关重要。研究降雨中 RDS 和 TSS 的重金属浓度对于制定 RDS 管理策略和设计有效的雨水管理实践非常重要。我们调查了降雨径流水体中 RDS 和 TSS 中的重金属（V、Cr、Mn、Co、Ni、Cu、Zn、As、Mo、Cd、Sn、Pb），以评估金属污染水平，并评估 RDS 重金属污染对 TSS 的贡献。工业区 RDS 和 TSS 中的重金属污染在小颗粒（<125μm）中相对较高，而 TSS 的重金属浓度高于 RDS。此外，TSS 中的重金属浓度在初期降雨时迅速增加。大于 125μm 的颗粒数量也增加，表明工业区域中积累的大金属颗粒也以非点源污染的形式排放。单位工业区域的 RDS 量（g/m）和重金属（Pb、Cu 和 Zn）的积累量（mg/m）分别比城区高 15 倍和 8-54 倍。考虑到<125μm 的颗粒在降雨期间更容易运输或排放，RDS 对 TSS 的贡献率为 41.3%，但对 TSS 中重金属的平均贡献率为 22.1%。来自工业区域 TSS 的重金属平均负荷为 77.9%。Cu、Ni、As、Cd 和 Sn 的负荷超过 90%，表明这些金属主要来自与金属加工相关的工业活动。我们的研究结果表明，需要采取有效的道路清洁和雨水径流管理策略来解决工业区域非点源重金属污染问题。
