Lee Taeyoon, Lim Hyunjung, Lee Yonghun, Park Jae Woo
Research Institute of Industrial Science and Technology, San 32 Hyoja-dong, Pohang, Kyongsangbukdo, South Korea.
Chemosphere. 2003 Nov;53(5):479-85. doi: 10.1016/S0045-6535(03)00548-4.
Cr(VI) removal from water was evaluated using waste iron particles in batch experimental mode. The reaction rates were inversely proportional to the initial Cr(VI) concentrations, and the reaction rates of Cr(VI) removal with the waste iron metal were faster than those with Peerless iron, a commercial zero-valent iron. The loss in iron reactivity due to the oxidation, from Fe(0) to Fe(II), ultimately to Fe(III), could be recovered by adding iron-reducing consortium (IRC) to the oxidized iron. Bacterial reduction of Cr(VI) also helped to decrease the aqueous concentration of Cr(VI), but the reduction of oxidized iron by IRC and the consequent reduction of Cr(VI) to Cr(III) by the reduced iron was more significant. Thus, reusing waste iron metal for Cr(VI) removal can reduce the cost of reactive media. Furthermore, the addition of IRC to the waste iron metal can accelerate the removal rate of Cr(VI), and can recover the reactivity of irons which were oxidized by Cr(VI).
采用批量实验模式，利用废铁颗粒评估了从水中去除六价铬（Cr(VI)）的效果。反应速率与初始Cr(VI)浓度成反比，废铁去除Cr(VI)的反应速率比商业零价铁——无敌铁（Peerless iron）更快。铁因氧化从Fe(0)变为Fe(II)，最终变为Fe(III)而导致的活性损失，可以通过向氧化后的铁中添加铁还原菌群（IRC）来恢复。细菌对Cr(VI)的还原也有助于降低Cr(VI)的水溶液浓度，但IRC对氧化态铁的还原以及随后还原态铁将Cr(VI)还原为Cr(III)的作用更为显著。因此，将废铁用于去除Cr(VI)可以降低反应介质的成本。此外，向废铁中添加IRC可以加快Cr(VI)的去除速率，还能恢复被Cr(VI)氧化的铁的活性。
