Removal of cadmium from cadmium-contaminated red soils using electrokinetic soil processing  

作　　者：刘云国 李程峰 曾光明 岳秀 李欣 徐卫华 汤春芳 袁兴中 

机构地区：[1]Department of Environmental Science and Engineering, Hunan University, Changsha 410082, China

出　　处：《中国有色金属学会会刊：英文版》2005年第6期1394-1400,共7页Transactions of Nonferrous Metals Society of China

基　　金：Project(04JJ3013)supportedbytheNaturalScienceFoundationofHunanProvince,China;Project(2001AA644020)supportedbytheNationalHi-techResearchandDevelopmentProgramofChina

摘　　要：To investigate the feasibility of electrokinetic soil processing on the removal of Cd from Cd-contaminated red soils, a laboratory experiment was conducted. A constant direct current density of 0.5mA/cm^2 was applied. The result shows that the Cd-removal efficiency is remarkably pH-dependent, which is caused by the change of Cd retention capacity of the red soils under different pH conditions. The initial Cd concentration is 1.490g/kg and over 79% of it is removed from the red soils after treatment for 96h. The energy expenditure per unit volume at the end of experiment is about 77.6kW·h/m^3 and the capital consumed by the whole experiment is 42.6RMB Yuan/m^3, which suggests that the electrokinetic soil processing is a promising technology for remedying Cd-contaminated red soils due to its high removal efficiency and low energy consumption.To investigate the feasibility of electrokinetic soil processing on the removal of Cd from Cd-contaminated red soils, a laboratory experiment was conducted. A constant direct current density of 0.5 mA/cm^2 was applied. The result shows that the Cd-removal efficiency is remarkably pH-dependent, which is caused by the change of Cd retention capacity of the red soils under different pH conditions. The initial Cd concentration is 1. 490 g/kg and over 79% of it is removed from the red soils after treatment for 96 h. The energy expenditure per unit volume at the end of experiment is about 77.6 kW · h/m^2 and the capital consumed by the whole experiment is 42.6 RMB Yuan/m^3 , which suggests that the electrokinetic soil processing is a promising technology for remedying Cd-contaminated red soils due to its high removal efficiency and low energy consumption.

关 键 词：土壤污染 重金属污染 镉 污染治理 红土 

分 类 号：X131.3[环境科学与工程—环境科学] X53