Electrokinetic Extraction of Metals from Marine Sediment

중금속으로 오염된 해양퇴적토의 전기동력학적 정화

  • 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)
  • 김경조 (성균관대학교 수자원전문대학원) ;
  • 유종찬 (전북대학교 환경공학과) ;
  • 양중석 (한국과학기술연구원 강릉분원) ;
  • 백기태 (전북대학교 환경공학과)
  • Received : 2013.07.01
  • Accepted : 2013.10.09
  • Published : 2013.12.01


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.


Supported by : 한국연구재단


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