Division of Architecture and Infrastructure, Luleå University of Technology, SE-971 87 Luleå, Sweden.
J Hazard Mater. 2010 Jun 15;178(1-3):612-8. doi: 10.1016/j.jhazmat.2010.01.129. Epub 2010 Feb 1.
Sedimentation is a widely used technique in structural best management practices to remove pollutants from stormwater. However, concerns have been expressed about the environmental impacts that may be exerted by the trapped pollutants. This study has concentrated on stormwater ponds and sedimentation tanks and reports on the accumulated metal concentrations (Cd, Cr, Ni, Pb, and Zn) and the associated toxicity to the bacteria Vibrio fischeri. The metal concentrations are compared with guidelines and the toxicity results are assessed in relation to samples for which metal concentrations either exceed or conform to these values. The water phase metal concentrations were highest in the ponds whereas the sedimentation tanks exhibited a distinct decrease towards the outlet. However, none of the water samples demonstrated toxicity even though the concentrations of Cu, Pb, and Zn exceeded the threshold values for the compared guidelines. The facilities with higher traffic intensities had elevated sediment concentrations of Cr, Cu, Ni, and Zn which increased towards the outlet for the sedimentation tanks in agreement with the highest percentage of fine particles. The sediments in both treatment facilities exhibited the expected toxic responses in line with their affinity for heavy metals but the role of organic carbon content is highlighted.
沉淀是结构最佳管理实践中广泛使用的技术，用于从雨水去除污染物。然而，人们对可能被截留的污染物所施加的环境影响表示关注。本研究集中于雨水池塘和沉淀池，并报告了积累的金属浓度（Cd、Cr、Ni、Pb 和 Zn）以及与细菌发光杆菌的相关性毒性。将金属浓度与指南进行比较，并根据金属浓度超过或符合这些值的样本评估毒性结果。池塘中的水相金属浓度最高，而沉淀池的出口处则明显下降。然而，尽管 Cu、Pb 和 Zn 的浓度超过了比较指南的阈值，但是没有水样显示出毒性。交通强度较高的设施具有较高的 Cr、Cu、Ni 和 Zn 的沉淀浓度，并且与沉淀池中最细颗粒的百分比一致，向出口处增加。两个处理设施的沉积物都表现出预期的毒性反应，与它们对重金属的亲和力一致，但强调了有机碳含量的作用。
