摘要
用电动方法对铬(Ⅵ)污染高岭土的修复进行了实验室研究。选用重铬酸钾作为污染物,配制的高岭土的重铬酸钾质量分数为100mg·kg-1。实验研究了铬(Ⅵ)污染高岭土电动修复的可行性,施加电压和处理时间对去除效率的影响,阴极电解产生的OH-对去除效率的影响及其控制方法,以及铬的迁移和分布规律。实验结果表明,电动修复可以有效去除高岭土中存在的铬(Ⅵ),最高去除效率可达97.8%;高岭中六价铬[Cr(Ⅵ)]以含氧阴离子形式存在,在电动修复过程中向阳极区域迁移;用蒸馏水冲洗和醋酸中和阴极电解产生的OH-,可以提高铬的去除效率。
This paper presents the experimental study on the electrokinetic remediation of the chromium-polluted kaolin at laboratory scale. Potassium dichromate was chosen as the pollutant and its initial concentration was 100 mg·kg^-1 kaolin. The feasibility of the remediation of chromium-polluted kaolin by electrokinetic technology was studied; the effects of the applied voltage and the operating time on the removal efficiency of chromium, the influence of OH^- produced at the cathode on the removal efficiency of chromium and its control, as well as the migration and distribution of chromium in kaolin were investigated. The results show that the chromium in kaolin can be effectively removed by electrokinetic remediation method and the highest removal efficiency can reach up to 97.8%. Cr（Ⅵ） exists as oxyanion and migrates towards the anode in the electrokinetic remediation process. Rinsing the OH^- with distilled water and neutralizing the OH^- with acetic acid can enhance the removal efficiency of chromium.
出处
《生态环境》
CSCD
北大核心
2005年第6期855-859,共5页
Ecology and Environmnet
