浮床植物对雨水中氮磷等污染物的去除效果

在实验室条件下,研究以美人蕉、空心菜及两者混合这3种情况下浮床植物对雨水中N、P和COD等营养盐类的去除效果及植物生长状况。结果表明两者混合种植时对TN、TP和COD的去除效果更好,其中美人蕉对TP的去除效果相对较好,空心菜对TN、COD的去除效果较好。选用混合浮床在镇江市雨水利用示范区进行雨水处理,由实验结果得知,混合植物浮床对雨水中TP、TN、COD、SS和浊度的去除效果良好,最高去除率分别达到86%、67.4%、66.4%、93.5%和95.4%。出水水质完全符合城市绿化用水标准,从而在达到雨水回用的目的,对成熟的美人蕉和空心菜进行6种重金属含量检测,也均达到相关的食用及药用标准。

Removal effect of pollutants such as N and P in rain water by floating bed plants

Under laboratory conditions,we studied the removal effect of N,P,COD in the rainwater among three different floating beds,which with plants of Canna indica,spinach,and the mixture of canna and spinach,respectively.The results showed that the removal efficiencies of TN,TP,COD of the mixture bed were better than the others,the canna was specific in the removal of TP,and TN,COD removal efficiency of spinach was better.Using mixed floating bed in the demonstration area of rainwater utilization demonstration project of Zhenjiang,the test results show that the highest removal efficiencies of TP,TN,COD,SS and turbidity are 86%,67.4%,66.4%,93.5%,95.4%,respectively.The quality of the effluent fully met the water standard for urban greening,the purpose of rainwater reuse was achieved.The six heavy metals in canna and water spinach were detected and the relevant standard of food and medical implementation was met.