Electrokinetic Extraction of Metals from Marine Sediment
- Electrokinetic Extraction of Metals from Marine Sediment
- 김경조; 유종찬; 양중석; 백기태
- EDTA; Electrokinetics; Marine Sediment; Processing Fluid; Voltage Gradient
- Issue Date
- Korean Chemical Engineering Research; 화학공학
- VOL 51, NO 6, 733-738
- 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), HNO3, 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.
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