Assessment of metal and PAH profiles in SUDS soil based on an improved experimental procedure

JOURNAL OF ENVIRONMENTAL MANAGEMENT

卷:202

Article

Tedoldi, Damien^1,2  Chebbo, Ghassan^1,3  Pierlot, Daniel²  Kovacs, Yves²  Gromaire, Marie-Christine¹ 

[1] UPE, UPEC, AgroParisTech, LEESU,UMR MA 102,Ecole Ponts, 6-8 Ave Blaise Pascal, F-77455 Cite Descartes 2, Marne La Vallee, France

[2] SEPIA, 53 Rue Turbigo, F-75003 Paris, France

[3] Lebanese Univ, Fac Engn 3, Hadath, Lebanon

关键词: Contamination profiles;    Metals;    Polycyclic aromatic hydrocarbons;    Runoff infiltration;    Spatial distribution;    Sustainable Urban Drainage Systems;   

DOI  :  10.1016/j.jenvman.2017.06.063

来源: Elsevier

【 摘 要 】

The increasing use of infiltration-based systems for stormwater management questions the soil's ability to act as a long-term filter for runoff contaminants, and brings about operational matters regarding the most effective maintenance practices to enhance contaminant retention in SUDS. This paper reports the vertical extent of metal and PAH contamination in the soil of seven source-control devices in operation for more than 10 years, assessed via a two-step sampling strategy to optimize the representativeness of the contamination profiles. Metal distribution was typically characterized by a significant surface buildup, followed by a decrease in concentrations with increasing depth, usually coming close to the background values. PAH were more heterogeneously distributed with depth, but their accumulation was globally restricted to the upper 10-40 cm. This indicates an interesting potential for pollution interception by the upper horizons of soil, but does not necessarily prevent from downward fluxes, even while measuring low surface contents, as deeper strata may have lesser retention capacities. Specific amendments of the surface soil may help prevent this problem. Surface soil renewal which would be necessary over 2.5-30 cm in four sites, according to the strictest standards for soil remediation may regenerate the soil's sorption potential, but such a practice could disrupt the interactions with the local ecosystem, so this should be carried out exceptionally and not as a preventive measure. (C) 2017 Elsevier Ltd. All rights reserved.

【 授权许可】

Free