title: Accumulated sediments in a detention basin: chemical and microbial hazard assessment linked to hydrological processes.
abstract: Accumulated sediments in a 32,000-m(3) detention basin linked to a separate stormwater system were characterized in order to infer their health hazards. A sampling scheme of 15 points was defined according to the hydrological behaviour of the basin. Physical parameters (particle size and volatile organic matter content) were in the range of those previously reported for stormwater sediments. Chemical analyses on hydrocarbons, PAHs, PCBs and heavy metals showed high pollutant concentrations. Microbiological analyses of these points highlighted the presence of faecal indicator bacteria (Escherichia coli and intestinal enterococci) and actinomycetes of the genus Nocardia. These are indicative of the presence of human pathogens. E. coli and enterococcal numbers in the sediments were higher at the proximity of the low-flow gutter receiving waters from the catchment. These bacteria appeared to persist over time among urban sediments. Samples highly contaminated by hydrocarbons were also shown to be heavily contaminated by these bacteria. These results demonstrated for the first time the presence of Nocardial actinomycetes in such an urban context with concentrations as high as 11,400 cfu g(-1).
authors: Université de Lyon, INSA de Lyon, LGCIE, 34 Avenue des Arts, 69621, Villeurbanne Cedex, France, christel.sebastian@insa-lyon.fr.
authors: C
authors: C
authors: Sébastian
authors: S
authors: S
authors: Barraud
authors: S
authors: S
authors: Ribun
authors: A
authors: A
authors: Zoropogui
authors: D
authors: D
authors: Blaha
authors: C
authors: C
authors: Becouze-Lareure
authors: G Lipeme
authors: GL
authors: Kouyi
authors: B
authors: B
authors: Cournoyer
mesh_terms: D004323:Drainage, Sanitary; D004784:Environmental Monitoring; D004926:Escherichia coli; D019015:Geologic Sediments / Q000032:analysis* / Q000737:chemistry / Q000382:microbiology; D062070:Hydrology; D019216:Metals, Heavy / Q000032:analysis; D011078:Polychlorinated Biphenyls / Q000032:analysis; D011084:Polycyclic Aromatic Hydrocarbons / Q000032:analysis; D014871:Water Microbiology; D014873:Water Pollutants / Q000032:analysis*
chemical_list: D019216:Metals, Heavy; D011084:Polycyclic Aromatic Hydrocarbons; D014873:Water Pollutants; D011078:Polychlorinated Biphenyls