城市绿地处理雨水的实验研究

Research on City Green Space to Purify Rainwater

为了处理匮乏的西北地区雨水资源中的污染物,构建种植不同草种的模拟绿地实验装置,在雨水径流大小不同的条件下实验,检测污染物出水浓度并做对比.研究结果表明,种有黑麦草的绿地系统对各污染物的去除率高于早熟禾组.通过和空白试验的对比表明,在去除雨水中污染物时植被发挥一定的作用,起主要作用的是渗滤介质;且最佳的雨水径流强度为291.7L/(h·m2),此时,对浊度、氨氮、总磷、CODCr均有很好的去除效果.在最佳径流强度下,对具有4种不同污染物浓度的进水均有很好的处理效果,且进水浊度为160NTU、CODCr为140mg/L、氨氮为5mg/L、总磷为1.8mg/L时,去除效果最好;对绿地系统去除污染物的机理研究表明,主要作用是靠微生物来完成的.综上可知,城市绿地可以很好的净化雨水.

City green space planting with different grasses is simulated to deal with pollutants ofthe rare rain resources in the northwest. The experiment is performed with different rainwaterrunoff to detect the processing conditions of pollutants. The results show that the removal rate ofthe pollutants in the rain of the group that planting ryegrass is higher than that planting bluegrass.Comparing with the blank test shows that plant plays a certain role and infiltration mediaplays a major role when removing the pollutants in the rain. The removal efficiency of turbidity,ammonia nitrogen,TP and CODCr is well under the best rainwater runoff intensity of 291. 7 L/（h·m2 ） ,and the removal efficiency of four different pollutant concentration is well. When the turbidityis 160 NTU,CODCr is 140 mg/L,ammonia nitrogen is 5 mg/L and TP is 1. 8 mg/L,the removalefficiency is best. The mechanism research of green space removing pollutants shows thatmicroorganism plays a main role. In summary,city green space can purify rainwater well.