凤眼莲对铅、镉废水净化能力的研究

A Study on Purifying Capacity of Water Hy-acinth in Pb-and Cd-Polluted Water

本文通过室内静态、动态实验和现场试验研究了凤眼莲对废水中铅、镉的积累能力和净化作用,实验结果表明,凤眼莲对废水中铅、镉有较强的净化作用、与处理浓度、放养时间和放养量有关,大约84—93％的铅、镉被积累在根中;不同浓度铅、镉废水养殖凤眼莲7—10天后,其去除率可达62—89％。凤眼莲对铅的吸收净化能力大于镉。

Under laboratory-conditions, the absorption of Eich-hornia crassipes to Pb-and Cd-polluted water and its purificatory function were studied. The results show that water hyacinth has significant accumulation and purify-iny function. In different concentrations of Pb and Cd-contalning waste water about 62-89% of Pb and Cd were dispelled by hyacinth in 7-10 days. The absorbed Pb and Cd in hyacinth was much more in roots and stems than in leaves. It was found that the Pb and Cd levels accumulated in plant roots and stems were 84-93%. Moreover, the absorption of Pb by hyacinth was much more than that of Cd. The above data show that water hyacinth is a good purifier for Pb and Cd-polluted water,