Road-deposited sediments mediating the transfer of anthropogenic organic matter to stormwater runoff

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ORIGINAL PAPER

Road-deposited sediments mediating the transfer of anthropogenic organic matter to stormwater runoff Do-Gun Kim . Seok-Oh Ko

Received: 31 March 2020 / Accepted: 25 August 2020 Ó Springer Nature B.V. 2020

Abstract It has been regarded that road-deposited sediment (RDS) is one of the important sinks of anthropogenic pollutants as well as the major source of pollutants in stormwater runoff. However, the role of RDS, as a mediator of pollutants to the stormwater runoff, has not yet been investigated so far. Therefore, in this study, the leaching of dissolved pollutants, especially dissolved organic matter (DOM) from RDS, in synthetic precipitation was investigated. A significant amount of metals, nutrients, dissolved compounds, and DOM was leached. The leaching of DOM during 10 sequential leachings was 1811.3 and 2301.7 mg C/kg for larger (63 lm–2 mm) and smaller (\ 63 lm) RDS, respectively. The results of UV/ Vis spectroscopy, fluorescence spectroscopy, and size exclusion chromatography showed that the leached DOM was of anthropogenic/abiotic origins with lower molecular weight and humification degree. It is

Electronic supplementary material The online version of this article (https://doi.org/10.1007/s10653-020-00703-2) contains supplementary material, which is available to authorized users. D.-G. Kim Department of Environmental Engineering, Sunchon National University, Suncheon 57922, Republic of Korea e-mail: [email protected] S.-O. Ko (&) Department of Civil Engineering, Kyung Hee University, Yonggin 17104, Republic of Korea e-mail: [email protected]

ubiquitous in stormwater runoff and industrial discharges and differs from natural organic matter. The results strongly suggest that RDS is an important mediator transferring anthropogenic pollutants to stormwater runoff. In addition, the removal of RDS, such as sweeping, would significantly reduce the pollutants input to the runoff. Keywords Anthropogenic organic matter  Leaching  Pollutants transfer mediator  Roaddeposited sediment  Stormwater runoff

Introduction It has been suggested that road-deposited sediment (RDS) plays an important role in urban sediments cascade system both as a sink and as a transport medium of various pollutants (Charlesworth and Lees 1999). The first role of RDS as a sink seems clear because RDS is seriously polluted with a variety of pollutants. The organic matter (OM), TOC, VS, T-N, TKN, and T-P were measured to be in the ranges of 1–20%, 6–28%, 11–54%, 1050–9340 mg/kg, 2080–13,200 mg/kg, and 645.1–5150 mg/kg, respectively (Bian and Zhu 2009; Seattle Public Utilities and Herrera Environmental Consultants 2009; Miguntanna et al. 2013; Kim et al. 2019). In addition, heavy metals are also associated with RDS. The reported

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Environ Geochem Health

concentrations of Cu, Ni, Pb, Zn, and Cd were 28.7–3093.7, 23–708, 37.3–699, 0.9–4024, and 0.44–2665 mg/kg, respectively (Wei and Yang 2010; Hu et al. 2011; Bian and Zhu 2009; Bourliva et al. 2017; Kim et al. 2019). The pollut