Desorption characteristics of kaolin clay contaminated with zinc from electrokinetic soil processing.
A number of bench scale laboratory column tests were carried out using a newly designed and developed electrokinetic cell to investigate the fundamental behavior of zinc-spiked kaolin clay subjected to an electric field. Laboratory investigations focused on (i) zinc migration by the combined effects of electromigration and electro-osmosis and (ii) the electrically induced desorption characteristics of zinc-contaminated kaolin that occurred during processing. The correlations of the applied voltage gradient, electro-osmotic flow rate, and the development of a pH gradient were examined and evaluated. The results showed that the removal efficiency was high during the early stage of processing due to rapid desorption by electrokinetic effects in the cathode region. However, the majority of zinc migrating from the anode was precipitated due to the high pH environment in the cathode region.
Lee
Myung Ho
MH
Department of Civil & Environmental Engineering, Hanyang University, 1271, Sa1-Dong, Sangnok-Ku, Ansan, Kyungki-Do, 426-791, Republic of Korea. mhleecok@paran.com
Kamon
Masashi
M
Kim
Soo Sam
SS
Lee
Jai-Young
JY
Chung
Ha Ik
HI
D000327:Adsorption; D000538:Aluminum Silicates / Q000737:chemistry / Q000302:isolation & purification*; D000077215:Clay; D004563:Electrochemistry / Q000379:methods*; D052918:Environmental Restoration and Remediation / Q000379:methods; D006863:Hydrogen-Ion Concentration; D007616:Kaolin; D012106:Research; D012987:Soil; D015032:Zinc / Q000737:chemistry*
D000538:Aluminum Silicates; D012987:Soil; D007616:Kaolin; D015032:Zinc; D000077215:Clay