水生植物净化农田排水的静态试验研究

Static Experiment for Purification of Agricultural Drainage by Aquatic Plants

农田排水中含有大量氮、磷等富营养化污染元素,试验利用浮床栽培几种常见水生植物,研究其对农田排水的净化作用。结果表明:14 d后,栽培了水生植物的净化系统的净化效率明显高于无植物系统。其中,芦苇、千屈菜和狐尾藻对氨氮和总氮净化效果明显,去除空白后,净化效率分别达42.8%、38.2%、36.6%和47.2%、44.1%、46.3%;香蒲、狐尾藻、美人蕉和芦苇对总磷净化效果较好,净化效率分别达49.0%、46.0%、41.8%和40.2%;芦苇和香蒲对COD净化效果较好,净化效率分别达31.1%、20.8%。

Agricultural drainage contains a lot of eutrophication pollution elements like nitrogen,phosphorus and so on.The research uses several common aquatic plants cultivated on floating bed to clean the polluted water.The results showed that 14 days after treatment,the purification efficiency of plants system was obviously better than that of non-plant system;reed,spiked loosestrlfe and watermifoil had stronger ability to remove NH3-N and TN,and their removal rates on NH3-N and TN were 42.8%,38.2%,36.6% and 47.2%,44.1%,46.3%,respectively;typha,watermifoil,canna and reed,had stronger ability to remove TP,and their removal rates on TP were 49.0%,46.0%,41.8% and 46.03%,respectively;reed and typha had stronger ability to remove COD,and their removal rates on COD were 31.1% and 20.81%,respectively.