高速公路立交桥雨水径流水质状况及利用模式分析

Analysis on Water Quality and Utilization Modes of Storm Runoff in Highway Overpass Area

从水质特征分析、水质评价、净化潜力分析以及利用模式4个方面，分析和总结了立交桥桥区雨水径流的水质状况及利用模式。结果表明，径流中各项污染物间存在较强的内部联系，SS、COD与浊度是主要污染物和净化的主要对象；除pH、NH4＾＋ -N始终达标外，SS、COD、BOD5、TP的EMC（〉60min）达标但EMC（O-90min）超标，浊度和Pb超标严重；在单一净化工艺作用下，除浊度、Pb外，各污染物均达标；宜采用物理与生物工艺相结合的模式，并总结了6种适于立交桥区的雨水径流净化方案，其稳定性和简便性易于在桥区应用和推广。

Water quality and utilization modes of storm runoff in highway overpass area were analyzed and summarized from the aspects of water quality characteristics, water quality assessment, and purification potential. The results indicated that there was a strong interior relationship between pollutants. SS, COD and turbidity were the three main pollutants in storm runoff of highway overpass, which were regarded as the main targets in process of purification. EMCs of pH, NH4^＋ -N were qualified in each part of rainfall duration and in the whole rainfall duration. EMCs（〉60 min） of SS, COD, BOD5 and TP were qualified, however the EMCs（O-90 min） of SS, COD, BOD5 and TP were unqualified . The turbidity and Pb were excessively unqualified. Except turbidity and Pb, other indexes were all qualified using individual purified craft. It was recommended to apply physical and biological purification crafts simultaneously. Six purificalion schemes for storm runoff, which were adapted to overpass area, were summarized and proposed. Considering the stability, simplicity and adaptability under different conditions, the proposed six purification schemes were easy to apply and generalize.