期刊
CHEMOSPHERE
卷 144, 期 -, 页码 1823-1830出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2015.09.077
关键词
Contaminated soil; Flushing; Electrokinetic remediation; Electrochemistry flushing; Chromium
资金
- Foundation of State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University [2011DA105287 - ZD201402]
A conceptual design and experiments, electrochemistry-flushing (E-flushing), using electrochemistry to enhance flushing efficiency for the remediation of Cr(VI)-contaminated soil is presented. The rector contained three compartments vertically superposed. The upper was airtight cathode compartment containing an iron-cathode. The middle was soil layer. The bottom was anode compartment containing an iron-anode and connected to a container by circulation pumps. H-2 and OH- ions were produced at cathode. H-2 increased the gas pressure in cathode compartment and drove flushing solution into soil layer forming flushing process. OH- ions entered into soil layer by eletromigration and hydraulic flow to enhance the desorption of Cr(VI). High potential gradient was applied to accelerate the electromigration of desorbed Cr(VI) ions and produced joule heat to increase soil temperature to enhance Cr(VI) desorption. In anode compartment, Fe2+ ions produced at iron-anode reduced the desorbed Cr(VI) into Cr3+ ions, which reacted with OH- ions forming Cr(OH)(3). Experimental results show that Cr(VI) removal efficiency of E-flushing experiments was more than double of flushing experiments and reached the maximum of removal efficiency determined by desorption kinetics. All electrochemistry processes were positively used in E-flushing technology. (C) 2015 Elsevier Ltd. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据