Electrokinetic remediation of mercury-contaminated soils using iodine/iodide lixiviant

被引:79
作者
Cox, CD
Shoesmith, MA
Ghosh, MM
机构
[1] Department of Civil Engineering, 223 Perkins Hall, University of Tennessee, Knoxville
关键词
D O I
10.1021/es950633r
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
In-situ remediation of mercury-contaminated soils, by electrokinetic or other means, is difficult because of the low solubility of mercury and its compounds. In this research, enhanced electrokinetic remediation of HgS-contaminated soils using I-2/I- lixiviant was investigated using bench-scale electrokinetic cells. The thermodynamic conditions under which the lixiviant could be effective were determined by constructing a pE-pH diagram for the Hg-S-I system. Introduced near the cathode, the lixiviant migrated through the soil to the anode by electromigration. Mercury, released by the oxidation of HgS compounds by I-2, was complexed as HgI42-. The negative complex continued to electromigrate toward the anode. Up to 99% of the Hg present in laboratory-contaminated soils could be removed. Electrokinetic treatment of a field-contaminated soil, containing more organic matter than the laboratory-contaminated soil, occurred much slower. The critical issues in determining the efficacy of the process are the oxidation of reduced Hg by I-2 and I-3(-) and the transport of the resultant HgI42- complex.
引用
收藏
页码:1933 / 1938
页数:6
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