Fe^0修复重金属铬铅复合污染水体的研究

Remediation of Cr-Pb polluted water with Fe^0

为研究在水体复合污染情况下,零价铁去除污染物的效果与污染物单独存在时的差异,通过批试验考察了零价铁去除铬铅复合污染的效果及影响因素,比较了零价铁去除铬铅复合污染的效果与单独污染时的差异,研究了在复合污染下,零价铁去除污染物的动力学模型。结果表明:在铬铅复合污染条件下,零价铁能够有效地去除污染水体中的污染物,去除率随铁粉投加量的增加或初始pH的下降而升高;相同反应条件下,零价铁对六价铬的去除率高于铅;复合污染时零价铁对六价铬的去除率略小于单独污染时,但对铅的去除率与单独污染时相比明显降低;复合污染时零价铁对铬、铅的去除符合准一级动力学模型,且随铁量增加或溶液初始pH上升,反应速率常数增大。零价铁能够快速有效地去除污染水体中的铬铅复合污染,去除率受铁粉投加量及反应液初始pH的影响;铬铅复合污染对零价铁去除六价铬的影响不大,但却使零价铁对铅的去除率明显降低;复合污染时零价铁对铬、铅的去除符合准一级动力学模型。

This paper is concerned on the differences in removing Cr and Pb in single and double polluted water with Fe0.The influencing factors and the removal kinetics model were also involved in this co-exsiting system by batch experiment.The data indicated that Cr-Pb was effectively removed from the polluted groundwater by Fe0.The removal proportion was related to the added Fe0 quantity and the initial pH.Generally,the removal efficiency of Cr was higher than that of Pb.The removal proportion of Pb was obviously decreased at the doubly-polluted water.The removal of Cr and Pb could be fit to pseudo-first-order reaction kinetics model in co-exsiting system.The more quantity of added iron and the lower initial pH,the larger rate constants were obtained.The added Fe0 quickly and effectively removed both Cr and Pb from the doubly-polluted groundwater.The removal ratio depended on the added amount of iron and the initial pH.