用凤眼莲(Eichhornia crassipes Solms)去除废水中氮、磷元素的功效及其相关因素的研究

在含Ag~+浓度为0.1～2.0ppm的屠宰废水中,凤眼莲降低N、P元素的效率,随浓度增加而降低;当Ag~+浓度为2ppm时,凤眼莲降低N、P元素的效率,随处理时间的延长而增加。去除N的百分率低于P的百分率。屠宰废水中的Ag~+浓度高达15ppm时,凤眼莲植株在24小时内坏死。不同Ag~+浓度的废水对凤眼莲根系脱氢酶活力水平的影响大小不同,从而影响到N、P元素的去除效率。实验结果为利用凤眼莲净化屠宰废水,富集回收水环境中的银,提供了重要依据。

A STUDY ON THE EFFICIENCIFS OF REMOVING N AND P ELEMENTS FROM THE WASTEWA- TER BY EICHHORNIA CRASSIPES SOLMS AND ON THE EFFECT OF RELATIVE FACTORS

The levels of N and P elements in the butchery waste-water were reduced obviously by Eichhornia crassipes Solms. The efficiencies of N and P removal were decreased as the concentration of Ag+ in the wastewater increased gradually from 0.1 to 2.0 ppm, and raised following the treatment time delayed when the wastewater contained 2 ppm Ag+. The removal efficiency(%) of N was less than P. The plants of Eichhornia crassipes Solms were necrotic and its root cells were deteriorated in 24 hours as Ag+concentration of the wastewater enhanced to 15 ppm. There were different effects on the activity of dehydrogenase of water hyacinth root because of the plant contacted with the wastewater containing Ag+ in different concentrations. The result of the experiment demonstrates that using water hyacinth to purify the wastewater, reduce the pollution of Ag+ and accumulate and recover Ag+ from the water body may be feasible.