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http://dx.doi.org/10.9713/kcer.2013.51.6.733

Electrokinetic Extraction of Metals from Marine Sediment  

Kim, Kyung-Jo (Department of Water Resource, Sung Kyun Kwan University)
Yoo, Jong-Chan (Department of Environmental Engineering, Chonbuk National University)
Yang, Jung-Seok (KIST-Gangneung Institute)
Baek, Kitae (Department of Environmental Engineering, Chonbuk National University)
Publication Information
Korean Chemical Engineering Research / v.51, no.6, 2013 , pp. 733-738 More about this Journal
Abstract
Sediment contains a high fraction of organic matter, high buffering capacity, and a large portion of fine grained particles such as silt and clay, which are major barriers to remove heavy metals from sediments. In this study, a lab-scale electrokinetic (EK) technique was applied to remove heavy metals effectively from marine sediment at a constant voltage gradient of 2 V/cm. A concentration of 0.1 M of ethylenediaminetetraacetic acid (EDTA), citric acid (CA), $HNO_3$, and HCl were circulated in the cathode, and tap water was circulated in the anode. CA extracted 92.4% of Ni, 96.1% of Cu, 97.1% of Zn, and 88.1% of Pb from marine sediment. A higher voltage gradient enhanced the transport of citrate and EDTA into the sediment and, therefore, increased metal extraction from the marine sediment through a complexation reaction between metals and the chelates. Based on these results, the electrokinetic process using a high voltage gradient with EDTA and CA might be useful to extract heavy metals from marine sediment.
Keywords
EDTA; Electrokinetics; Marine Sediment; Processing Fluid; Voltage Gradient;
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Times Cited By KSCI : 2  (Citation Analysis)
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