黑藻对城市河道水质的净化效果

Simulation Test of Purification Effect of Hydrilla verticillata in Urban Rivers

采用模拟试验研究了黑藻对城市河道水质的净化效果。结果表明,与静水状态相比,在流速为1.74 cm/s的动水条件下,黑藻对NH3-N、TP和CODCr的净化均有优势,平均去除率为92.03%、83.08%和74.04%;根据GB 3838—2002《地表水环境质量标准》要求,试验结束后,地表水质可由原Ⅴ类水净化为Ⅲ类水;动水组黑藻平均生物量大于静水组。说明黑藻在较低流速的水环境中生长情况好于静水条件,并且净化作用更优。

The purification effect of Hydrilla verticillata for urban river water was simulated. The results showed that compared with the still water condition,under the moving water condition with water flow of 1. 74 cm / s,Hydrilla verticillata had the superiority in purification of NH3-N,TP and CODCr,with the average removal rate of 92. 03%,83. 08% and 74. 04%, respectively. After the experiment, the original surface water was purified from Classification V to Classification III,according to the Environmental Quality Standards for Surface Water（ GB 3838-2002）. The biomass of Hydrilla verticillata of the moving water group was greater than that of the still water group,demonstrating that the Hydrilla verticillata grew better under low water-flow condition and had better purification effect,compared with the still water condition.