Decolorization of Azo Dyeing Wastewater Using Underwater Dielectric Barrier Discharge Plasma

수중 유전체장벽방전 플라즈마를 이용한 아조 염색폐수 색도제거

  • 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)
  • 조진오 (제주대학교 생명화학공학과) ;
  • 이상백 (제주대학교 생명화학공학과) ;
  • 목영선 (제주대학교 생명화학공학과)
  • Published : 2013.10.31


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.


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