Université de Lyon, INSA de Lyon, LGCIE, 34 Avenue des Arts, 69621, Villeurbanne Cedex, France,
Environ Sci Pollut Res Int. 2014 Apr;21(8):5367-78. doi: 10.1007/s11356-013-2397-z. Epub 2013 Dec 12.
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).
为了推断沉积物的健康危害，对与独立雨水系统相连的 32000 立方米调蓄池中的淤积物进行了特征描述。根据盆地的水文行为，确定了 15 个采样点的采样方案。物理参数（粒径和挥发性有机物含量）处于先前报道的雨水沉积物范围内。对碳氢化合物、多环芳烃、多氯联苯和重金属的化学分析表明，污染物浓度很高。对这些点的微生物分析突出了粪便指示菌（大肠杆菌和肠道肠球菌）和诺卡氏放线菌属放线菌的存在。这表明存在人类病原体。在靠近接收集水区低流量排水沟的地方，沉积物中的大肠杆菌和肠球菌数量更高。这些细菌似乎在城市沉积物中长时间存在。被碳氢化合物严重污染的样本也被证明被这些细菌严重污染。这些结果首次证明了在这种城市环境中存在诺卡氏放线菌，其浓度高达 11400 cfu g(-1)。
