绿地系统对径流污染物净化机理的研究

采用城市绿地和降雨系统模拟装置,研究绿地系统对径流污染物的净化机理。研究表明,模拟绿地对径流污染物的削减和污染物总量的控制有较好作用。降雨期间绿地系统对径流污染物中化学需氧量、氨氮、硝酸盐氮及总磷的去除率为32.1%-49.9%;污染物的去除主要靠土壤和植物根系的截留、吸附和吸收作用,通过分析,发现土壤对氨氮及总磷的吸附反应在常温下较易进行,对硝酸盐氮的吸附反应在常温下较难进行。降雨后微生物开始降解吸附于土壤颗粒表面和植物根系的污染物,5-8d土壤中微生物数量达到最大值,14-17d土壤污染物含量基本降到降雨前水平,土壤得到再生。

Study on Decontaminating Mechanism of Green System to Runoff Pollutants

The paper uses urban greenbelt and rainfall simulator to study decontaminating mechanism of Green system to runoff pollutants. Research shows that greenbelt simulation has played a better role in reducing and controlling runoff pollutants. The removal rate of green system on the runoff pollutants is 32.1%-49.9%. The adsorption processes are carried out and it is found that the adsorption reaction on NH4^＋-N and TP at room temperature is spontaneous, but the adsorption reaction on NO3-N is difficult to be carried out. After the rainfall, microbes start to degrade the adsorbed pollutants. 5-8 d after rainfall, the number of microbes in the soil reaches the maximum, and 14-17 d later, pollutants in the soil reduce to the basic level before the rainfall. So the soil is renewable.