微污染地表水的植物净化试验研究

桂林桃花江作为漓江的一级支流，水质逐年恶化，富营养化情况加重．对桃花江内水生植物调查后，选取较常见的水生植物苦草、金鱼藻、黑藻、菹草和菖蒲，将它们栽种到试验用桶中，并用桃花江水培养。试验进行40d后，结果表明，在去除总氮、总磷等方面，金鱼藻和菖蒲的效果较好，对总氮的去除率分别达到80．1％和70．2％，对总磷的去除率为93．4％和88．2％，水生植物对氨氮的去除效果较总氮好，为47．2％～91．1％，而除金鱼藻外其它水生植物对CODCr的去除效果不明显，沉水植物菹草由于较适宜生长在流动水体中，净化效果相对较差。

Study on Hydrophytes for Purification of Micro-polluted Surface Water

In this study, several common hydrophytes in Taohuajiang River of Guilin were choosed to treat micro - polluted surface water. These hydrophytes, Vallisneria natans, Ceratophyllum demersum, Hydrilla verticillata, Potamogeton crispus and Acorus calamus were respectively planted in five pails and the raw water plants needing was taken from Taohuajiang River. After 40 days, the results showed that these hydrophytes had a higher ability to remove total nitrogen （TN）, total phosphorus （TP） and ammonia nitrogen （ NH3 - N）. Among them, Ceratophyllum demersum and Acorus calamus could effectively remove TN （80. 1% and 70. 2% ）, TP （93.4% and 88.2% ）, even had significant effect on removing ammonia nitrogen（from 47. 2% to 91.1% ）. The results also showed that hydrophytes could not remove CODcr effectively except Ceratophyllum demersum, and Potamogeton crispus because of fitting for flowing water had a worse effect on removing these indexes.