Li Suli, Huang Hailian, Li Zhigang, Li Zhengwen, He Zhenli, Liang He
College of Agriculture, Guangxi University, Nanning 530005, China E-mail:
University of Florida, Institute of Food and Agricultural Science, Indian River Research and Education Center, Fort Pierce, FL 34945, USA.
Water Sci Technol. 2017 Oct;76(7-8):2203-2212. doi: 10.2166/wst.2017.396.
In this study, the chromium removal capability and photosynthetic capacity response of plants were investigated in vertical flow wetland microcosms (VFWM) treated with Cr(VI) bearing domestic sewage. Two plants, Cyperus alternifolius (C. alternifolius) and Coix lacryma-jobi L. (C. lacryma-jobi L.) grown in the VFWM enhanced the purification of Cr(VI) enriched domestic sewage. Cr concentration in the effluent fell below detection limit (<0.03 mg L), except for the C. alternifolius wetland treated with 40 mg L Cr(VI). The biomasses of both plants species were increased at 10 and 20 mg L Cr(VI) exposure but inhibited at 40 mg L Cr(VI). The photosynthetic capacities of both plants were not affected at 10-40 mg L Cr(VI) exposure during the days 20-60. However, they were inhibited significantly (P < 0.05) at 40 mg L Cr(VI) exposure during days 80-100. These results demonstrated that a VFWM with C. alternifolius and/or C. lacryma-jobi L. was capable of maintaining its efficiency and recovering its vegetation. VFWM with C. alternifolius and/or C. lacryma-jobi L. was promising for purifying wastewater which contains low to medium concentrations of Cr(VI) (<20 mg L).
在本研究中，对用含六价铬生活污水处理的垂直流湿地微宇宙（VFWM）中植物的铬去除能力和光合能力响应进行了研究。生长在VFWM中的两种植物，即风车草（C. alternifolius）和薏苡（C. lacryma-jobi L.），提高了对富含六价铬生活污水的净化效果。除了用40 mg/L六价铬处理的风车草湿地外，出水铬浓度降至检测限以下（<0.03 mg/L）。两种植物在10和20 mg/L六价铬暴露下生物量增加，但在40 mg/L六价铬暴露下受到抑制。在第20 - 60天期间，两种植物在10 - 40 mg/L六价铬暴露下光合能力未受影响。然而，在第80 - 100天期间，它们在40 mg/L六价铬暴露下受到显著抑制（P < 0.05）。这些结果表明，含有风车草和/或薏苡的VFWM能够保持其效率并恢复其植被。含有风车草和/或薏苡的VFWM有望用于净化含有低至中等浓度六价铬（<20 mg/L）的废水。
