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Optimization of Zero-valent Iron Technology for Color Removal from Real Dye Wastewater  

Lee, Jae Woo (Department of Environmental Engineering, Korea University)
Oh, Young Khee (GS Engineering and Construction Corporation)
Cha, Daniel K. (Department of Civil and Environmental Engineering, University of Delaware)
Lee, Taewon (Department of Information and Mathematics, Korea University)
Ko, Kwang Baik (School of Civil & Environmental Engineering, Yonsei University)
Publication Information
Journal of Korean Society on Water Environment / v.25, no.5, 2009 , pp. 758-763 More about this Journal
Abstract
This study presents the optimal conditions of zero-valent iron (ZVI) pretreatment for color removal from real dye wastewater. Removal of color by ZVI was strongly subject to the acidity of the wastewater buffering the pH increased after ZVI reduction. The real dye wastewater did not contain a sufficient amount of acidity and thus it was necessary to supplement acid to the dye wastewater before treatment. In continuous operation of iron column, the empty bed contact time (EBCT) and initial pH were varied to find the optimal conditions. A non-linear regression model fitted well the experimental result predicting that the optimal EBCT and pH for 80% removal efficiency was present in the range of 57~90 and 5~5.9, respectively. Color of column effluents could be further removed in the following biological oxidation step and the biodegradability of wastewater was also enhanced after iron pretreatment.
Keywords
Color removal; Dye wastewater; Empty bed contact time (EBCT); pH; Zero-valent iron (ZVI);
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Times Cited By KSCI : 2  (Citation Analysis)
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