北方人工湿地植物对污水净化效果研究

对栽种水葫芦、大藻、水鳖3种湿地植物的潜流人工湿地进行研究，分析3种植物在不同生长期（包括幼苗期、成长期、成熟期、衰败期）以及在不同覆盖度（包括100％、80％、60％）下对污水的净化效果。试验结果表明，植物成熟期（7～9月）对污染物去除率比其他阶段明显要好；大藻最佳覆盖度为60％、水葫芦最佳覆盖度为80％、水鳖的最佳覆盖度为60％。

Research on the Sewage Purification Effect of the Hydrophytes in Northern Constructed Wetlands

Hydrophyte plays a vital role in sewage treatment of constructed wetland. This paper is intended to make an experimental study on the subsurface flow of the constructed wetland planted with three different kinds of hydrophytes:Eichhornia crassipes (Mart.) Solms,Pistia stratiotes L. and Hydrocharis dubia (Bl.) Backer. This paper aims to make an analysis on the sewage purification effect of these hydrophytes in each growth stages (the seedling stage,the expanding stage,the mature stage and the degrading stage) while with different coverage (respectively 100%,80% and 60%). The result of this test has demonstrated that the mature stage of plants has the best removal rate of sewage compared with any other stages; the best coverage density of Pistia stratiotes L. is 60%,Eichhornia crassipes 80% and Hydrocharis dubia 60%. This research will be of great significance for the research and development of the northern constructed wetland studies.