前池雨水花园系统对工业区雨水净化效果研究

Experiment on purification effects of front pond rain garden system in industrial area

针对现有城市工业区建筑屋面雨水径流污染的现状,设计了一种前池雨水花园系统,并进行了人工降雨模式下的污染物去除效果实验研究。结果表明,在降雨条件为重现期一年,降雨历时为60 min下,系统对径流中COD、SS、TN、TP、Cu、Zn、Pb、Cd和石油类的去除主要靠植物渗滤吸收和土壤颗粒吸附等过程,平均去除率分别为65.40%,93.09%,56.20%,72.55%,98.03%,92.83%,86.05%,82.50%,83.24%;前池部分利用重力沉降作用对污染物进行初期去除,尤其是对SS和石油类污染物的去除率高达50%以上,对去除效果不稳定的Cu也有良好的去除效果。因此,在雨水花园系统中增设前池,能显著提高对雨水的净化能力。

In view of the current situation of roof rainwater runoff pollution of buildings in urban industrial areas,this paper proposes a front pond rain garden system,and carries out an experiment on pollutant removal effects under artificial rainfall mode.The results show that under the rainfall condition of recurrence period of one year and rainfall duration of 60 min,the removal of COD,SS,TN,TP,Cu,Zn,Pb,Cd and petroleum in runoff mainly depends on the processes of plant percolation absorption and soil particle adsorption.The average removal rate were 65.40%,93.09%,56.20%,72.55%,98.03%,92.83%,86.05%,82.50%,83.24%,respectively.In the front pood,gravity sedimentation was used for the initial removal of pollutants,especially for the removal rate of SS and petroleum pollutants which were more than a half,and the removal effect of Cu with unstable removal effect was also good.Therefore,adding a front pood in the rain garden system can significantly improve its rainwater purification capacity.