【摘要】 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。更多还原

【Abstract】 The settleability of rainfall runoff from the highway surface was analyzed based on accumulated settled sludge volume.The results show that the removal effect of SS is evident at first 30 min of settling and the removal rate accounts for 67.15% of the whole removal rate via settling for 2 h.The higher the SS removal rate is,the lower the settling velocity is.The removal effects of COD and TP are evident,after 2 h,the average removal rates are 25.86% for COD and 23.03% for TP,but the removal effect of TN is poorer.There is good correlation between the removal rate of SS and the removal rates of COD and TP.The settling removal rate of SS is mainly influenced by temperature of rainfall runoff,and there is a positive correlation between the initial SS concentration and the settling removal rates of SS,COD and TP.However,the influence of pH on the settling removal rates of three contaminants is not evident.更多还原