道路径流差异性对面源污染控制的影响

Effect of Different Roads Runoff on Non-point Source Pollution Treatment

不同材料道路径流污染规律差异显著,基于PROMETHEE多变量决策分析软件对2013年深圳市同一道路沥青和水泥2种典型材料路段4场降雨径流水质指标的分析发现,沥青道路径流水质总体上劣于水泥道路,说明城市道路面源污染控制设施应重点针对沥青道路布设;2种道路径流具有不同类型优势污染物,故不同道路径流污染控制设施选择须有针对性;与水泥道路相比,沥青道路径流水质更易随着降雨类型的变化而变化,因此选择合适的降雨类型是沥青道路径流污染控制措施设计的关键步骤;电导率EC与沥青道路径流中DOC、SO42--S和TN等溶解态指标相关性很高,其相关系数均高于0.95,是沥青道路径流溶解态污染物理想的指示性指标,可为面源污染控制设施设计与评估提供支撑。

Significant differences were found in different materials road runoff. The road runoff samples, which were collected from asphalt and concrete sections in the same road during 4 rain events in 2013 in Shenzhen, were analyzed by PROMETHEE multivariable decision analysis software. The outcomes indicate that the asphalt road runoff quality is worse than the concrete road in general and the non-point source pollution control facilities should be focus on treating the asphalt road runoff primarily. The primary pollutants in two road runoff are different dramatically and this must be taken into consideration in the control facilities selection. It is noticeable that there is strong relationship between asphalt road runoff quality and rainfall characteristics while the much weaker relationship for the concrete road runoff and rainfall characteristics. This indicates that choosing a suitable rainfall pattern is a key step in control facilities design. Electrical conductivity （EC） shows the highly correlation with DOC, SO4^2--S and TN in asphalt road samples, and all the correlation values are higher than 0.95, which means that EC is an effective index to estimate the concentration of other pollutants in asphalt road runoff and this Could provide support for design and evaluation of non-point source pollution control facility.