Fe0修复重金属铬铅复合污染水体的研究

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.

Remediation of Cr-Pb polluted water with Fe0

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.