三种水生植物对人工养殖污水中主要污染物的影响

Effects of Three Aquatic Plants on the Change of Main Pollutants in Aquaculture-like Wastewater

为评估水生植物对养殖污水污染物清除能力,选择了美人蕉、再力花和鸢尾3种观赏水生植物为试验材料,种植于仿养殖废水配制的人工污水中,分析了养殖污水中总氮、氨氮、总磷、CODCr、Cu、Zn和pH值的变化。与对照相比,三种植物处理后总氮、pH值具较低水平,显著降低总磷水平。氨态氮在处理第4周后低于对照。3种植物处理前2周显著降低CODCr,但之后有明显的反弹。鸢尾处理中Cu含量最低,美人蕉处理的Zn含量较低。美人蕉处理中pH值变化和下降最为明显。

In order to estimate the potential of aquatic plants to remove the pollutants from the aquaculture wastewater. Three ornamental aquatic plants Canna glauca, Thalia dealbata and Iris pseudacorus were grown in a culture container filling aquaculture-like wastewater and Total nitrogen, NH4 +-nitrogen, Total phosphorus, CODCr, pH and contents of Cu and Zn of culture liquid were measured once every weeks. Compared to the control, Three plants treatments had lower level of TN, pH and reduced TP significantly. The level of NH4 +-N of plants treatments were shown to be lower than that of the control after 4 weeks. Three plant dramatically dropped CODCrat two weeks after treatments. The lowest content of Cu and Zn were found at the treatments of Iris pseudacorus and Canna glauca respectively. Canna glauca also caused a big change and drop of pH of culture liquid.