Trace metals trapping dynamics in urban stormwater constructed treatment wetlands: Cases study in Strasbourg, Moulins-les-Metz and Leuville-sur-Orge - CNRS - Centre national de la recherche scientifique Accéder directement au contenu
Communication Dans Un Congrès Année : 2016

Trace metals trapping dynamics in urban stormwater constructed treatment wetlands: Cases study in Strasbourg, Moulins-les-Metz and Leuville-sur-Orge

Dynamique du piégeage des micropolluants métalliques au sein des zones humides artificielles traitant des eaux pluviales urbaines strictes : Etude de cas à Strasbourg, Moulins-lès-Metz et Leuville-sur-Orge

Résumé

Stormwater constructed wetlands (SCW) in Strasbourg (Alsace, France), Moulin-lès-Metz (Lorraine, France), and Leuville-sur-Orge (Ile-de-France, France) receive and treat exclusively runoffs from urban catchments but with different soil uses. Made up of sedimentation ponds and a vertical subsurface flow constructed wetland, the treatment facilities lead to trap several trace metal pollution. Each site belongs to different hydroclimatic areas (modified oceanic, modified continental and semi-continental) and was designed for different purposes (watercourse protection in Strasbourg and in Leuville-sur-Orge, protection of drinking water wells in Moulins-lès-Metz). The aim of this study is to explore trace metals (Cd, Cu, Pb and Zn) behaviours in these SCW. We investigated trace metal trapping by determining concentrations in the systems compartments (filters media and plants). Then trace metal speciation was determined through sequencial extractions of the sediment and filter media. This allowed to determine their forms in soils and to anticipate their behaviour during physical and chemical condition changes. This study permits to obtain first results for the metals stability, to highlight a decrease of the concentrations through the SCW depth (from surficial sediment to clean filter media) and to observe a negligible metal trap in plants (mainly in roots).
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hal-03167938 , version 1 (12-03-2021)

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  • HAL Id : hal-03167938 , version 1

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M. Walaszek, A. Caner-Chabran, J. Laurent, P. Branchu, C. Mucig, et al.. Trace metals trapping dynamics in urban stormwater constructed treatment wetlands: Cases study in Strasbourg, Moulins-les-Metz and Leuville-sur-Orge. Novatech 2016 - 9ème Conférence internationale sur les techniques et stratégies pour la gestion durable de l'Eau dans la Ville / 9th International Conference on planning and technologies for sustainable management of Water in the City, Jun 2016, Lyon, France. ⟨hal-03167938⟩
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