Priority organic pollutants in the urban water cycle (Toulouse, France)

摘要

Application of the European Water Framework Directive requires Member States to have betternunderstanding of the quality of surface waters in order to improve knowledge of priority pollutants.nXenobiotics in urban receiving waters are an emerging concern. This study proposes a screeningncampaign of nine molecular species of xenobiotics in a separated sewer system. Five sites wereninvestigated over one year in Toulouse (France) using quantitative monitoring. For each sample,npolycyclic aromatic hydrocarbons, polychlorinated biphenyls, nonylphenols, diethelhexylphthalate,nlinear alkylbenzene sulphonates, methyl tert-butylether, total hydrocarbons, estradiol andnethinylestradiol were analysed. Ground, rain and roof collected water concentrations are similar tontreated wastewater levels. Run-off water was the most polluted of the five types investigated,ndischarged into the aquatic environment. The wastewater treatment plant reduced xenobioticnconcentrations by 66% before discharge into the environment. Regarding environmental qualitynstandards, observed concentrations in waters were in compliance with standards. The results shownthat xenobiotic concentrations are variable over time and space in all urban water compartments.