Hilliges R, Endres M, Tiffert A, Brenner E, Marks T
Hochschule Augsburg - University of Applied Sciences, An der Hochschule 1, 86161 Augsburg, Germany E-mail:
Federal Highway Research Institute (BASt), Bergisch Gladbach, Germany.
Water Sci Technol. 2017 Mar;75(5-6):1169-1176. doi: 10.2166/wst.2016.576.
Urban runoff is known to transport a significant pollutant load consisting of e.g. heavy metals, salts and hydrocarbons. Interactions between solid and dissolved compounds, proper understanding of particle size distribution, dissolved pollutant fractions and seasonal variations is crucial for the selection and development of appropriate road runoff treatment devices. Road runoff at an arterial road in Augsburg, Germany, has been studied for 3.5 years. A strong seasonal variation was observed, with increased heavy metal concentrations with doubled and tripled median concentrations for heavy metals during the cold season. Correlation analysis showed that de-icing salt is not the only factor responsible for increased pollutant concentrations in winter. During the cold period, the fraction of dissolved metals was lower compared to the warm season. In road dust, the highest metal concentrations were measured for fine particles. Metals in road runoff were found to show a significant correlation to fine particles SS63 (<63 μm). Therefore, it is debatable whether treatment devices only implementing sedimentation processes provide sufficient removal rates.
众所周知，城市径流会携带大量污染物，包括重金属、盐分和碳氢化合物等。固体与溶解化合物之间的相互作用、对粒径分布、溶解污染物组分以及季节变化的正确理解，对于选择和开发合适的道路径流处理装置至关重要。德国奥格斯堡一条主干道的道路径流已被研究了3.5年。研究观察到了强烈的季节变化，在寒冷季节重金属浓度增加，重金属中位数浓度翻倍甚至增至三倍。相关性分析表明，除冰盐并非导致冬季污染物浓度增加的唯一因素。在寒冷时期，溶解态金属的比例相较于温暖季节更低。在道路灰尘中，细颗粒的金属浓度最高。道路径流中的金属与细颗粒SS63（<63微米）呈现出显著相关性。因此，仅采用沉淀工艺的处理装置是否能提供足够的去除率仍存在争议。
