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Decolorization of Azo Dyeing Wastewater Using Underwater Dielectric Barrier Discharge Plasma  

Jo, Jin Oh (Department of Chemical and Biological Engineering, Jeju National University)
Lee, Sang Baek (Department of Chemical and Biological Engineering, Jeju National University)
Mok, Young Sun (Department of Chemical and Biological Engineering, Jeju National University)
Publication Information
Applied Chemistry for Engineering / v.24, no.5, 2013 , pp. 544-550 More about this Journal
Abstract
This work investigated the environmental application of an underwater dielectric barrier discharge plasma reactor consisting of a porous hydrophobic ceramic tube to the decolorization of an azo dyeing wastewater. The reactive species generated by the plasma are mostly short-lived, which also need to be transferred to the wastewater right after the formation. Moreover, the gas-liquid interfacial area should be as large as possible to increase the decolorization rate. The arrangement of the present wastewater treatment system capable of immediately dispersing the plasmatic gas as tiny bubbles makes it possible to effectively decolorize the dyeing wastewater alongside consuming less amount of electrical energy. The effect of discharge power, gas flow rate, dissolved anion and initial dye concentration on the decolorization was examined with dry air for the creation of plasma and amaranth as an azo dye. At a gas flow rate of $1.5Lmin^{-1}$, the good contact between the plasmatic gas and the wastewater was achieved, resulting in rapid decolorization. For an initial dye concentration of $40.2{\mu}molL^{-1}$ (volume : 0.8 L; discharge power : 3.37 W), it took about 25 min to attain a decolorization efficiency of above 99%. Besides, the decolorization rate increased with decreasing the initial dye concentration or increasing the discharge power. The presence of chlorine anion appeared to slightly enhance the decolorization rate, whereas the effect of dissolved nitrate anion was negligible.
Keywords
porous hydrophobic ceramic; dielectric barrier discharge; decolorization; azo dye;
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