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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 15    No. 6    December 2005

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Removal of cadmium from cadmium-contaminated red soils using electrokinetic soil processing
LIU Yun-guo(刘云国), LI Cheng-feng(李程峰), ZENG Guang-ming(曾光明), 
YUE Xiu(岳 秀), LI Xin(李 欣), XU Wei-hua(徐卫华), 
TANG Chun-fang(汤春芳), YUAN Xing-zhong(袁兴中)

Department of Environmental Science and Engineering, Hunan University, 
Changsha 410082, China

Abstract: 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 0.5mA/cm2 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 1.490g/kg and over 79% of it is removed from the red soils after treatment for 96h. The energy expenditure per unit volume at the end of experiment is about 77.6kW•h/m3 and the capital consumed by the whole experiment is 42.6RMB Yuan/m3, 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.

 

Key words: cadmium; electrokinetic soil processing; red soil; electroosmosis

ISSN 1672-7029
CN 43-1423/U

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