Electrokinetic extraction of lead from kaolinites: II. Experimental investigation |
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Authors: | Cheng-non Hsu Albert T Yeung Rajendra M Menon |
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Institution: | (1) Rikulau International Co. Ltd, No. 70-9 Sing An Road, Ta-Jia Township, Taichung County, Taiwan;(2) Department of Civil Engineering, The University of Hong Kong, Pokfulam Road, Pokfulam, Hong Kong;(3) Regional Income Tax Agency, 2274 Demi Drive, Twinsburg, OH 44087, USA |
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Abstract: | This is the second paper of two companion papers presenting the results of laboratory bench-scale experimental studies on
electrokinetic extraction of lead from two different kaolinites. The theoretical formulation and numerical simulation of the
process are presented in the first paper. Two different kaolinites were used in the study: (1) Georgia kaolinite and (2) Milwhite
kaolinite. The lead spiked in Georgia kaolinite was highly mobilized and effectively extracted by the technique as the pH
in the soil was significantly lowered by the electrokinetic process. Milwhite kaolinite has a much higher acid/base buffer
capacity, and the required acidic environment could not be developed. As a result, removal of the lead spiked in Milwhite
kaolinite was minimal. Comparison between simulations and experimental results is also presented. Factors affecting the cleanup
efficiency of the process and potential enhancement techniques are also discussed. |
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Keywords: | |
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