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Simultaneous Removal of Cyanide and Copper Ions in a Semi-Fluidized Ion Exchanger Bed
1Department of Environmental Engineering, Chonnam National University, Kwang-ju, Korea 2Faculty of Applied Chemical Engineering, Chonnam National University, Kwang-ju, Korea
sjkim@chonnam.chonnam.ac.kr
Korean Journal of Chemical Engineering, September 1999, 16(5), 664-669(6), 10.1007/BF02708149
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Abstract
Simultaneous removal of cyanide and copper ions from electroplating wastewater was studied in a liquid-solid semi-fluidized ion exchanger bed. The diameter and the height of column are 20 mm and 600 mm, respectively. Strong-base anion exchange resin particles (Dowex1X8-50) were contacted with synthetic solutions containing copper and cyanide ions. Cyanide and copper ions in the solution were analyzed by a cyanide electrode and ICP (inductively coupled plasma), respectively. The ion exchange equilibrium data of Cu+ removed as cyanide-copper complexes on Dowex1X8-50 at 25℃ can be fitted with the Langmuir equation. Early leakage of cyanide from experimental loading profile data results in not only lower selectivity of free cyanide but also different seletivities of CN-Cu complexes due to the size and the structure of complexes. The optimum molar ratio (Q) between cyanide and copper ions is about 3 to obtain a reasonable removal rate of cyanide in this experimegnt.
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