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首页> 外文期刊>Frontiers of environmental science & eng >Transferral of HMs pollution from road-deposited sediments to stormwater runoff during transport processes
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Transferral of HMs pollution from road-deposited sediments to stormwater runoff during transport processes

机译：运输过程中HMs污染从道路沉积物向雨水径流的转移

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摘要

Stormwater runoff, derived from the wash-off of road-deposited sediments (RDS), contains elevated heavy metal (HM) concentrations and, thus, imposes an increasing threat to urban aquatic ecosystems. In-depth understanding of the variations of HMs pollution from RDS to stormwater during transport processes facilitates the development of effective RDS and stormwater control strategies. Toward this end, the distribution of HMs (Cu, Pb, Zn, Cr, and Ni) in RDS and stormwater were investigated simultaneously. The results show a preferential accumulation of Pb and Zn in the finer (38.5 m) RDS, and Cu, Cr and Ni in the coarser (38.5-150 m) RDS. For stormwater, n.d.48.6% of HMs fractionated into the dissolved phase, and stormwater particles constitute the primary carriers of HMs. Furthermore, the accumulation of HMs in stormwater particles increased linearly with finer particle size distributions (PSD). Geoaccumulation index (I-geo) highlighted the predominant pollution of both RDS and stormwater particles by Cu, Pb and Zn. Nonetheless, Cu, Pb, and Ni mostly contributed the potential ecological risk of RDS, whereas Cu, Pb, and Zn mainly contributed that of stormwater particles. Moreover, contamination by Cu, Pb and Zn was significantly higher in stormwater particles than that in RDS. These differences are attributable to the solubility and size-dependent accumulation of HMs in RDS, as well as the PSD variations during transport processes. The study outcomes highlight the importance of very fine (nano- and submicron- scale) RDS in stormwater pollution and the necessity of control.
机译：雨水径流源于道路沉积物（RDS）的冲刷，含有较高的重金属（HM）浓度，因此对城市水生生态系统构成了越来越大的威胁。对运输过程中从RDS到雨水的HMs污染变化的深入了解有助于开发有效的RDS和雨水控制策略。为此，同时研究了RDS和雨水中的HMs（Cu，Pb，Zn，Cr和Ni）的分布。结果表明，较细的（<38.5 m）RDS中优先积累了铅和锌，较粗的（38.5-150 m）RDS中优先积累了铜，铬和镍。对于雨水，n.d.48.6％的HMs分解成溶解相，雨水颗粒构成HMs的主要载体。此外，HMs在雨水颗粒中的积累随着更细的粒度分布（PSD）线性增加。地积累指数（I-geo）突显了铜，铅和锌对RDS和雨水颗粒的主要污染。尽管如此，铜，铅和镍主要是造成RDS的潜在生态风险，而铜，铅和锌主要是造成雨水颗粒的风险。此外，雨水颗粒中铜，铅和锌的污染明显高于RDS。这些差异可归因于HM在RDS中的溶解度和尺寸依赖性积累，以及运输过程中PSD的变化。研究结果突出了非常好的（纳米和亚微米级）RDS在雨水污染中的重要性以及控制的必要性。

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  • 来源
    《Frontiers of environmental science & eng》 |2019年第1期|13.1-13.11|共11页
  • 作者

    Wang Qian; Zhang Qionghua; Dzakpasu Mawuli; Chang Nini; Wang Xiaochang;

  • 作者单位

    Xian Univ Architecture & Technol, Sch Environm & Municipal Engn, Minist Educ, Key Lab Northwest Water Resource Environm & Ecol, Xian 710055, Shaanxi, Peoples R China;

    Xian Univ Architecture & Technol, Sch Environm & Municipal Engn, Minist Educ, Key Lab Northwest Water Resource Environm & Ecol, Xian 710055, Shaanxi, Peoples R China|Int Sci & Technol Cooperat Ctr Urban Alternat Wat, Xian 710055, Shaanxi, Peoples R China;

    Xian Univ Architecture & Technol, Sch Environm & Municipal Engn, Minist Educ, Key Lab Northwest Water Resource Environm & Ecol, Xian 710055, Shaanxi, Peoples R China|Int Sci & Technol Cooperat Ctr Urban Alternat Wat, Xian 710055, Shaanxi, Peoples R China;

    Xian Univ Architecture & Technol, Sch Environm & Municipal Engn, Minist Educ, Key Lab Northwest Water Resource Environm & Ecol, Xian 710055, Shaanxi, Peoples R China;

    Xian Univ Architecture & Technol, Sch Environm & Municipal Engn, Minist Educ, Key Lab Northwest Water Resource Environm & Ecol, Xian 710055, Shaanxi, Peoples R China|Int Sci & Technol Cooperat Ctr Urban Alternat Wat, Xian 710055, Shaanxi, Peoples R China;

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  • 正文语种 eng
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  • 关键词

    Road-deposited sediment; Stormwater runoff; Heavy metal; Particle size; Pollution variation;

    机译：道路沉积物;暴雨径流;重金属;颗粒大小;污染变化;

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