Assessment of 34 dissolved and particulate organic and metallic micropollutants discharged at the outlet of two contrasted urban catchments

The assessment of micropollutants in urban wet weather discharges is essential to improve the knowledge of the impact of such discharges on receiving waters. This study assessed the quality of combined sewer overflows (CSOs) in Ecully (residential catchment) and stormwater runoff in Chassieu (indust...

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Bibliographic Details
Published in:The Science of the total environment 2019-02, Vol.651 (Pt 2), p.1810-1818
Main Authors: Becouze-Lareure, C., Dembélé, A., Coquery, M., Cren-Olivé, C., Bertrand-Krajewski, J.-L.
Format: Article
Language:English
Subjects:
Combined sewer overflows
Environmental Engineering
Environmental Sciences
Priority substances
Stormwater runoff
Wastewater
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Summary:The assessment of micropollutants in urban wet weather discharges is essential to improve the knowledge of the impact of such discharges on receiving waters. This study assessed the quality of combined sewer overflows (CSOs) in Ecully (residential catchment) and stormwater runoff in Chassieu (industrial catchment) during rain events by providing data on occurrence and total event mean concentrations (EMCt) of 34 priority substances (PS) (9 metals, 13 pesticides, 6 PAHs, 4 alkylphenols and 2 chlorobenzenes) in dissolved and particulate fractions. Over 34 substances monitored, 23 were quantified in urban wet weather discharges of both catchments. For both catchments, 9 metals and 6 PAHs monitored were always quantified, reflecting their ubiquitous presence. For other organic pollutants, only 5 pesticides were quantified and only 2 alkyphenols were measured solely in dissolved fraction. A significant site-to-site difference was observed for metals, PAHs and alkylphenols. The highest concentrations were measured in stormwater runoff in Chassieu vs. Ecully. On the contrary, the diuron concentrations were highest in CSO discharges in Ecully. Distribution of the PS between particulate and dissolved fractions provides information for urban stormwater practitioners. Most PS in urban wet weather discharges were mainly linked to particles (PAHs, Pb, Ti for example). The comparison between daily flows of wastewater treatment plants during dry weather and CSOs daily flows in Ecully showed that stormwater was the most important source of contamination for fluoranthene, benzo(b)fluoranthene and benzo(k)fluoranthene and 7 metals (As, Cr, Co, Cu, Pb, Ti and Zn) in receiving water bodies, but not for pesticides and alkylphenols. [Display omitted] •Among 34 micropollutants analysed in both dissolved and particulate fractions, 24 were detected in both catchments.•Distribution between the particulate and the dissolved phases provides information for urban stormwater practitioners.•PS loads discharged into receiving water bodies were higher for stormwater runoff in separate sewer system than in CSOs.•Comparison between the PS loads discharged by CSOs by a wastewater treatment plant at the daily time scale.
ISSN:0048-9697
1879-1026
DOI:10.1016/j.scitotenv.2018.10.042