植物对潜流人工湿地净化微污染水效果的影响研究

以4种湿地植物为实验对象,在野外构建中试潜流人工湿地,研究了不同植物及植物连根收割对湿地运行效果的影响。结果显示,植物明显提升了湿地的去污效果;其中美人蕉湿地的TP和NH4+-N去除率最高,达到55.6%和78%;空心菜湿地的TN去除率最高,达到80.5%;芦竹湿地的COD去除率最高,为26.6%;植物连根收割后,湿地运行效果下降;其中TN去除率降至空白水平之下,而其他污染指标下降至略高于空白的水平。

Impact of plants on purification efficiencies of subsurface horizontal flow constructed wetland treating micro-polluted water

In order to investigate the impact of plant species and harvesting on purification efficiencies of subsurface horizontal flow constructed wetland(CW),CWs with four different plants were constructed to treat micro-polluted water under field conditions.The results showed that plants helped to improve removal rates of pollutants in CW.CW with Canna indica had the highest removal rates of TP and NH+4-N,which were 55.6% and 78.0%,respectively.CW with Ipomoea aquatic had highest removal rate of TN,which was 80.5%.CW with Arundo donax had highest removal rate of COD,which was 26.6%.Purification efficiencies of CWs reduced with plants harvesting,and removal rate of TN descended below the control,while removal rates of other pollutants kept slight superiority to the control.