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Optimization of Hybrid Process of(Chemical Coagulation, Fenton Oxidation and Ceramic Membrane Filtration) for the Treatment of Reactive Dye Solutions  

Yang, Jeong-Mok (Green Engineering Team, Korea Institute of industrial Technology(KITECH))
Park, Chul-Hwan (Green Engineering Team, Korea Institute of industrial Technology(KITECH))
Lee, Byung-Hwan (Department of Chemical System Engineering, Keimyung University)
Kim, Tak-Hyun (Division of Radiation Application, Korea Atomic Energy Research Institute(KAERI))
Lee, Jin-Won (Department of Chemical and Biomolecular Engineering, Sogang University)
Kim, Sang-Yong (Green Engineering Team, Korea Institute of industrial Technology(KITECH))
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Abstract
This study investigated the effects of hybrid process(chemical coagulation, Fenton oxidation and ceramic UF(ultrafiltration)) on COD and color removals of commercial reactive dyestuffs. In the case of chemical coagulation, the optimal concentrations of $Fe^{3+}$ coagulant for COD and color removals of RB49(reactive blue 49) and RY84(reactive yellow 84) were determined according to the different coagulant dose at the optimal pH. They were 2.78 mM(pH 7) in RB49 and 1.85 mM(pH 6) in RY84, respectively. In the case of Fenton oxidation, the optimal concentrations of $Fe^{3+}\;and\;H_2O_2$ were obtained. Optimal $[Fe^{2+}]:[H_2O_2]$ molar ratio of COD and color removals of RB49 and RY84 were 4.41:5.73 mM and 1.15:0.81 mM, respectively. In the case of ceramic UF, the flux and rejection of supernatant after Fenton oxidation were investigated. After ceramic UF for 9 hr, the average flux of RB49 and RY84 solutions were $53.4L/m^2hr\;and\;67.4L/m^2hr$ at 1 bar, respectively. In addition, the permeate flux increased and the average flux recovery were 98.5-99.9%(RB49) and 91.0-97.3%(RY84) according to adopting off-line cleaning(5% $H_2SO_4$). Finally, COD and color removals were 91.6-95.7% and 99.8% by hybrid process, respectively.
Keywords
Reactive Dye; Chemical Coagulation; Fenton Oxidation; Ceramic Membrane;
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