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Electrophoretic Particle Movement in Suspension Considering the Gravitational Settling and Sedimentation of Clayey Soil  

Lee, Myung-Ho (Department of Civil & Environmental Engineering, Hanyang University)
Publication Information
Journal of Soil and Groundwater Environment / v.12, no.3, 2007 , pp. 44-52 More about this Journal
Abstract
Contaminated sediments more than 30 million/$m^3$ is generated from dredging work for harbours and coastal maintenance in Korea. Approximately 300 million/$m^3$ of sediments is dredged to deepen harbours and shipping lanes in US and of which $3{\sim}12million/m^3$ is highly contaminated. Although much is known about technologies for the remediation of heavy metal contaminated soil, much less is known about the treatment of contaminated sediment. In general, negatively charged fine particles will migrate towards positively charged system of electrodes under the influence of electrophoresis. However, the electrically induced migration of colloidal particles contaminated with heavy metals may be hindered by the positively charged heavy metal contaminants adsorbed onto the soil surfaces depending on the contamination level. This paper demonstrates settling behaviour of clayey soil by comparison with electrophoretic particle movement under the effects of heavy metal contamination, applied electric field strength, and its polarity changed by the electrode configuration.
Keywords
clayey soil; electrophoresis; heavy metal; precipitation; sedimentation;
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