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Application of Iron Sand as Adsorbent for the Removal of Heavy Metal  

Yang, Jae-Kyu (School of Civil & Environmental Engineering, Kwandong University)
Yu, Mok-Ryun (School of Civil & Environmental Engineering, Kwandong University)
Lee, Seung-Mok (School of Civil & Environmental Engineering, Kwandong University)
Publication Information
Journal of Korean Society of Environmental Engineers / v.27, no.11, 2005 , pp. 1180-1185 More about this Journal
Abstract
Iron sand, having iron as a major component, was applied in the treatment of synthetic wastewater containing Cu(II) or Pb(II). To investigate the stability of iron sand at acidic condition, dissolution of Fe and Al was studied with variation of solution pH ranging from 2 to 4.5. Iron concentration in the extracted solution was below the emission regulation of wastewater even at a strong acidic condition, pH 2. Although an important concentration of aluminum was extracted at pH 2, the dissolution greatly decreased above pH 3. This stability test suggests that application of iron sand has little problem in the treatment of wastewater above pH 3. Adsorption capacity of Cu(II) and Pb(II) onto iron sand was investigated in a batch and a column test. In case of Cu(II), rapid adsorption was noted, showing 50% removal within 2 hrs, and then reached a near complete equilibrium after 24 hrs. Adsorption was favorable at higher pH in each metal ion and showed a near complete removal above pH 6, indicating a typical cationic-type adsorption. From the adsorption isotherm obtained with variation of the concentration of each metal ion, the maximum adsorption capacity of Cu(II) and Pb(II) was identified as 2,170 mg/kg 및 3,450 mg/kg, respectively.
Keywords
Iron Sand; Adsorption; Heavy Metal;
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