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Electrokinetic technique has been used in sedimentation at mining applications as a volume reduction for slurry tailing wastes. This technique has been used in remediation for environmental application as a potential in-situ remediation method for contaminated soils and wastes. Thus electrokinetic technique can be used in sedimentation and remediation of sediments. A regulated constant voltage was applied on the testing sample, directed upward, top cathode (-) and bottom anode (+) during electrokinetic sedimentation process. On the other hand, constant voltage was applied on the testing sample, directed downward, top anode (+) and bottom cathode (-) during electrokinetic remediation process. This means that the polarity reversal was employed. The time dependent settlement and concentration due to electrophoresis and electro-osmosis was measured on an hourly basis. The sedimentation rate of specimen and removal rate of contaminant in contaminated sediment were increased with increasing of applied voltages.
electrokinetic, sedimentation, remediation, contaminant, sediment
Research Fellow, Korea Institute of Construction Technology, Gyeonggi-do,
Professor, Oxford University, Oxford,
Professor, Graduate School of Global Environmental Studies, Kyoto University, Sakyo-ku,