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Received July 8, 2014
Accepted December 26, 2014
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This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits
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Enhancing biological treatment of dye wastewater with zero-valent iron
Department of Environmental Engineering, Daegu University, 201, Daegudae-ro, Gyeongsan 712-714, Korea 1Department of Civil & Environmental Engineering, 301 Du Pont Hall, Newark, DE, 19716, U.S.A., Korea
Korean Journal of Chemical Engineering, September 2015, 32(9), 1812-1817(6), 10.1007/s11814-014-0388-5
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Abstract
Pretreatment of authentic industrial dye wastewater with zero-valent iron (ZVI) was evaluated using a bench-scale integrated anaerobic-aerobic (ZVI-AO) biological treatment system. Average ADMI (American Dye Manufacturers’ Institute) value of dye wastewater was reduced from 245 to 107 units with ZVI column pretreatment. Subsequent treatment of ZVI column effluent by a continuous AO process further reduced the ADMI values to 18-39, resulting in overall decolorization efficiency of 78-89%. A control AO system without ZVI pretreatment, which was operated in parallel, achieved just 44-69% of ADMI removal efficiency. In addition, the ZVI integrated system yielded effluents with much lower COD and BOD concentrations than the control system. The aerobic batch respiration tests confirmed that ZVI treatment transformed the recalcitrant dye compounds to slowly biodegradable fractions, thus enhancing the overall biodegradability of dye wastewater.
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