中文摘要：

利用湿生铬超富集植物李氏禾构建的三段式波形潜流式人工湿地，研究了湿地系统对Cr（Ⅵ）污染水体的净化效果。结果显示，李氏禾湿地系统对Cr（Ⅵ）污染水体的净化效果明显好于无植物的对照。当进水Cr（Ⅵ）浓度为2．50mg／L时，李氏禾湿地系统出水Cr（Ⅵ）浓度显著低于对照，说明李氏禾在湿地系统净化Cr（Ⅵ）污染水体中发挥了重要的作用。当进水Cr（Ⅵ）浓度超标150倍（7．50mg／L）时，李氏禾湿地系统出水Cr（Ⅵ）浓度仍可达到国家地表水环境质量标准（0．05mg／L），表明李氏禾湿地系统具有很强的Cr（Ⅵ）污染净化能力。沿程Cr（Ⅵ）浓度的变化显示，湿地系统对Cr（Ⅵ）的去除效率随水流方向逐渐降低，Cr（Ⅵ）主要在湿地系统的前两个阶段被去除。

英文摘要：

The three-stage wavy subsurface flow constructed wetland planted with Leersia hexandra Swartz （SFCW-L） was used to purify water contaminated by Cr（ Ⅵ）. An unplanted system was applied as control. The results showed that purification performance of SFCW-L for Cr（Ⅵ） was better than that of the control. For the influent Cr（ Ⅵ ） of 2.50 mg/L, effluent concentration in SFCW-L was significantly lower than that in unplanted control, implying that L. hexandra played an important role in Cr（Ⅵ） removal. When the initial Cr（ Ⅵ ） con- centration （7.50mg/L） was 150 times as high as permissible limit in the Environmental Quality Standard for Surface Water （GB3838-2002） , effluent concentrations were consistently below the permissible limit （0.05 mg/ L） , which indicated that removal of Cr（Ⅵ） from water by SFCW-L was feasible at considerable high influent Cr （Ⅵ） concentration. According to the longitudinal variation of Cr（Ⅵ） concentration in the constructed wetland system, it could be clearly observed that the Cr（Ⅵ） removal efficiency in the constructed wetland system de- clined along the water flow direction, and much of the Cr（ Ⅵ） was removed in the first two stages of the con- structed wetland system.