UMR CNRS 5023 LEHNA, ENTPE, Université de Lyon, 69518 2, Rue Maurice Audin, 69518, Vaulx-en-Velin, France,
Environ Sci Pollut Res Int. 2014 Apr;21(8):5357-66. doi: 10.1007/s11356-013-2325-2. Epub 2013 Nov 19.
Detention basins are valuable facilities for urban storm water management, from both the standpoint of flood control and the trapping of pollutants. Studies performed on storm water have shown that suspended solids often constitute the main vector of pollutants (heavy metals, polycyclic aromatic hydrocarbon (PAH), etc.). In order to characterise the ecotoxicity of urban sediments from storm water detention basins, the sediments accumulated over a 6-year period were sampled at five different points through the surface of a large detention basin localised in the east of Lyon, France. A specific ecotoxicological test battery was implemented on the solid phase (raw sediment) and the liquid phase (interstitial water of sediments). The results of the study validated the method formulated for the ecotoxicological characterization of urban sediments. They show that the ecotoxicological effect of the sediments over the basin is heterogeneous and greater in areas often flooded. They also show the relationship between, on one hand, the physical and chemical characteristics of the sediments and, on the other hand, their ecotoxicity. Lastly, they contribute to a better understanding of the dynamics of the pollution close to the bottom of detention basins, which can be useful for improving their design. The results of this research raise particularly the issue of using oil separators on the surface of detention basins.
调蓄池是城市雨水管理的重要设施，从防洪和截留污染物的角度来看都具有重要意义。对雨水的研究表明，悬浮固体通常是污染物（重金属、多环芳烃（PAH）等）的主要载体。为了描述来自城市雨水调蓄池底泥的生态毒性，在法国里昂东部的一个大型调蓄池的表面，从五个不同点采集了 6 年来积累的底泥样本。在固相（原状底泥）和液相（底泥间隙水）上实施了特定的生态毒理学测试组合。该研究的结果验证了用于城市底泥生态毒性特征描述的方法。结果表明，整个调蓄池底泥的生态毒性效应具有异质性，且在经常被淹没的区域更大。结果还表明了底泥的物理化学特性与生态毒性之间的关系。最后，这些结果有助于更好地了解靠近调蓄池底部的污染动态，这对于改进其设计可能很有用。这项研究的结果特别提出了在调蓄池表面使用隔油器的问题。
