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Characterization and transfer of heavy metals in two different urban stormwater infiltration work sediments : an experimental approach


Congress title :6ème Conférence internationale sur les techniques et stratégies durables pour la gestion des eaux urbaines par temps de pluie (NOVATECH 2007)
Congress town :Lyon
Congress date :25/06/2007

Summary

This work aims at studying the release of Cadmium, Copper and Zinc that accumulate at the surface of rainwater infiltration ponds in the case of infiltration/drainage phases or during a salinity front. Sediments were sampled at two different sites. Despite the heterogeneity of the particles present in the sediments, their physico-chemical characteristics (total element content and molecular analysis of organic matter) were close. The results of laboratory columns experiments show that heavy metals are strongly sorbed on the sediment (less than 1% released in both conditions) and their elution is correlated to the one of TOC. The infiltration/drainage phases enhance the release of soluble Zinc whereas the salinity front leads to a strong solubilization of soluble an colloïdal Copper.
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