Retention and transport processes of particulate and dissolved micropollutants in stormwater biofilters treating road runoff

Road runoff is contaminated by various micropollutants and may be treated using low impact development techniques, such as stormwater biofilters. Better understanding the processes, such as filtration, sorption and leaching, which affect pollutants in these systems is essential to reliably predictin...

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Bibliographic Details
Published in:The Science of the total environment 2019-03, Vol.656, p.1178-1190
Main Authors: Flanagan, Kelsey, Branchu, Philippe, Boudahmane, Lila, Caupos, Emilie, Demare, Dominique, Deshayes, Steven, Dubois, Philippe, Meffray, Laurent, Partibane, Chandirane, Saad, Mohamed, Gromaire, Marie-Christine
Format: Article
Language:English
Subjects:
Biofiltration
Deicing salt
Earth Sciences
Environmental Engineering
Environmental Sciences
Filtration
France
Hydrology
Low impact development
Micropollutants
Particulate Matter - analysis
Rain
Road runoff
Sciences of the Universe
Sorption
Water Pollutants, Chemical - analysis
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Summary:Road runoff is contaminated by various micropollutants and may be treated using low impact development techniques, such as stormwater biofilters. Better understanding the processes, such as filtration, sorption and leaching, which affect pollutants in these systems is essential to reliably predicting treatment performance and optimizing system design. Field data from an in situ monitoring campaign, wherein dissolved and particulate concentrations of a wide range of micropollutants (trace metals, polycyclic aromatic hydrocarbons, bisphenol-A, alkylphenols and phthalates) were characterized in untreated road runoff and biofilter outlets for 19 rain events, are used to explore transport and retention processes. Although retention of the particulate phase of pollutants was generally quite effective, unusually high particle concentrations were observed at biofilter outlets for three winter events. Particle characterization in road runoff and outlet waters revealed that this degraded performance was due to poor filtration rather than particle erosion, which was attributed to the relative abundance of small (
ISSN:0048-9697
1879-1026
1879-1026
DOI:10.1016/j.scitotenv.2018.11.304