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Application of Reused Powdered Waste Containing Aluminum Oxide on the Treatment of Cr(VI)  

Lim, Jae-Woo (Department of Environmental Engineering, Kwangwoon University)
Kim, Tae-Hwan (Department of Environmental Engineering, Kwangwoon University)
Kang, Hyung-Sik (Department of Environmental Engineering, Kwangwoon University)
Kim, Do-Son (Department of Environmental Engineering, Kwangwoon University)
Kim, Han-Seon (Department of Environmental Engineering, Kwangwoon University)
Cho, Seok-Hee (Department of Environmental Engineering, Kwangwoon University)
Yang, Jae-Kyu (Division of General Education, Kwangwoon University)
Chang, Yoon-Young (Department of Environmental Engineering, Kwangwoon University)
Publication Information
Journal of Korean Society of Environmental Engineers / v.31, no.3, 2009 , pp. 179-185 More about this Journal
Abstract
In this research, the removal capacity of Cr(VI) by the reused powdered wastes (RPW) containing aluminium oxides was studied. As a pre-treatment process for the preparation of calcined wastes, calcination was conducted at $550^{\circ}C$ to remove organic fraction in the raw wastes. In order to study the adsorption trend of Cr(VI) ions from aqueous solutions, the pH-edge adsorption, adsorption kinetic and adsorption isotherm were investigated using a batch reactor in the presence of four different background electrolytes($NO_3\;^-,\;CO_3\;^{2-},\;SO_4\;^{2-},\;PO_4\;^{3-}$). Cr(VI) adsorption was greatly reduced in the presence of $SO_4\;^{2-}$ and $PO_4\;^{3-}$ over the entire pH range. Meanwhile the inhibition effect by $NO_3\;^-$ and $CO_3\;^{2-}$ was relatively lower than that by $SO_4\;^{2-}$ and $PO_4\;^{3-}$. Cr(VI) adsorption was maximum around pH 4.5 in the presence of $NO_3\;^-$ and $CO_3\;^{2-}$. As the concentration of background electrolytes increased, Cr(VI) adsorption decreased. This result mightly suggests that adsorption between the surface of RPW and Cr(VI) occurs through outer-sphere complex. Cr(VI) adsorption onto the RPW was well described by second-order kinetics. From the Langmuir isotherm at initial pH 3, the maximum adsorbed amount of Cr(VI) onto the RPW was 11.1, 10, 3.3, 5 mg/g in the presence of $NO_3\;^-,\;CO_3\;^{2-},\;SO_4\;^{2-}$, and $PO_4\;^{3-}$, respectively.
Keywords
Adsorption; Chromate; Aluminium Oxide; Background Electrolytes;
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Times Cited By KSCI : 2  (Citation Analysis)
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