水生植物对不同富营养化程度水体净化能力研究

Purification of Eutrophic Water of Different Degrees with Hydrophytes

为不同富营养化程度水体筛选出净化能力强的植物种类,文章采用模拟人工湿地系统处理人工配制污水的方法,以7 d为一个采样周期,比较了5种植物(满江红、槐叶萍、四叶萍、黑藻和慈姑)在轻度、中度和重度富营养水体中TN、TP、NH4+-N去除能力。实验结果表明:5种植物处理能力随着富营养程度提高而增大。在重度富营养条件下,处理能力满江红>黑藻>四叶萍>槐叶萍>慈姑。在重度条件下,满江红对TN、TP、NH4+-N的平均去除率分别为94.51%、77.41%和74.64%。

To select better purification plants for eutorphic water of different degrees,the simulated constructed wetland system was used to treat sewage artificially made.Removal abilities of TP,TN,NH4＋-N by five hydrophytes including Azolla imbircata（Roxb.）Nakai,Salvinia natans（L.）All.,Marsilea quadrifolia L,Hydrilla verticillata,Sagittaria sagittifolia in mildly,moderately and seriously eutrophic water were compared in the sampling period of 7d.Results showed that removal ability by these five hydrophytes increased with the improvement of the degree of eutrophic water,with removal ability ranking as Azolla imbircata（Roxb.）Nakai,Hydrilla verticillata,Marsilea quadrifolia L,Salvinia natans（L.）All.and Sagittaria sagittifolia in seriously eutrophic water.Removal rates of TN,TP,NH4＋-N by Azolla imbircata（Roxb.）Nakai were 94.51%,77.41% and 74.64% respectively.