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采用累积沉泥法分析了高速公路路面径流雨水的沉降特性。结果表明:沉降过程的前30 min内对SS的去除效果明显,去除率占沉降2 h去除率的67.15%;SS沉降去除率越大,对应的沉降速率范围限值越小;沉降过程对COD和TP的去除效果较明显,沉降2 h的平均去除率分别为25.86%、23.03%,但对TN的去除效果较差;SS沉降去除率与COD、TP沉降去除率的相关性较好;径流雨水的温度对SS沉降去除率的影响显著,初始SS浓度与SS、COD和TP的沉降去除率均呈正相关性,而pH值对这3种污染物的沉降去除率影响不显著。
The sedimentation characteristics of runoff rainwater on expressway surface were analyzed by using cumulative sediment method. The results show that the removal efficiency of SS is obvious in the first 30 min of sedimentation, the removal rate accounts for 67.15% of the 2 h removal rate; the larger the SS removal removal rate is, the smaller the corresponding settlement rate range limit is; The removal efficiency of TP and TP were obvious. The average removal rates after 2 h of sedimentation were 25.86% and 23.03%, respectively, but the removal efficiency of TN was poor. The correlation between SS sedimentation removal rate and COD and TP sedimentation removal rate was good. Runoff The effect of rainwater temperature on the SS sedimentation removal rate was significant. The initial SS concentration was positively correlated with SS, COD and TP sedimentation removal rate, while the pH value had no significant effect on the sedimentation removal rate of the three pollutants.