高速公路路面雨水径流污染物出流规律研究

基于南京机场高速公路禄口高架桥降雨径流监测资料,结合国内外的研究成果,探讨了高速公路路面降雨径流污染物的出流规律,路面径流事件平均浓度及其影响因素。研究表明,COD与SS的出流规律基本类似,当降雨量和降雨强度较大时初期浓度较高,随后逐渐减小,最终趋于稳定,径流初期效应显著;当降雨量和降雨历时较小时,COD与SS浓度波动较小,初期效应不明显。路面降雨径流污染严重,各污染物EMC平均值分别为:SS 238 mg/L、COD 196 mg/L、NH3-N 3.86 mg/L、TN 11.93 mg/L、TP 0.89 mg/L。降雨特性对各污染物影响权重为:前期晴天数>降雨强度>降雨量、降雨历时。

Study on the Flow Rules of Highway Rainwater Runoff Pollutants

Based on the monitoring data of rainwater runoff at Lukou viaduct of Nanjing airport highway,as well as the research achievements both at home and abroad,the flow rules of highway rainwater runoff pollutants were discussed,the event mean concentration(EMC) and influential factors of the highway runoff were studied.The results showed that the flow rules of COD and SS were similar,when the precipitation amount and intensity were large,the concentrations of COD and SS were high,then gradually decreased and finally became stable,the primary runoff effect was significant;but when the precipitation amount and intensity became small,the concentrations of COD and SS experienced small fluctuations without significant primary effect.The rainwater runoff of road surface was seriously polluted,the EMCs of each pollutants were 238,196,3.86,11.93 and 0.89 mg/L for SS,COD,NH3-N and TP.The pollutants were influenced by the factors in this order: number of previous sunny days > precipitation intensity > rainfall amount and rainfall duration.