A study of Ozone Oxidation of Methylene Blue

Methylene Blue의 오존(O3) 산화반응에 관한 연구

  • Lee, Cheal-Gyu (Department of Environmental Engineering, Chongju University) ;
  • Kim, Moon-Chan (Department of Environmental Engineering, Chongju University)
  • 이철규 (청주대학교 이공대학 환경학부) ;
  • 김문찬 (청주대학교 이공대학 환경학부)
  • Received : 2004.12.15
  • Accepted : 2005.04.11
  • Published : 2005.06.10

Abstract

In this study treatment efficiencies of methylene blue were evaluated in term of BOD, COD, TOC, absorbance and initial decolorization rates. Ozonation of the dye in distilled water was performed in a laboratory scale cylindrical batch reactor. The decolorization process of methylene blue was carried out by bubbling ozone at the bottom of a bubble column reactor containing the dye solution. Decolorization, determined by measuring the light absorbance at the maximum wavelength in the (${\lambda}_{max}$, 660 nm), was almost complete after 40 min with an ozone concentration of $50{\pm}10mg/L$. The $TOC/TOC_0$ ratio after ozonation was about 83.8%, the COD was diminished to 44.0% of the initial value. The $BOD_5/COD$ ratio was increased from 64.2% to about 90.8%, indicating an enhancement of biodegradable compounds in the ozonated solutions. The pseudo first-order rate constants of the ozonation was $3.30{\times}10^{-2}min^{-1}$ and the activation energy was $3.01kcal{\cdot}mol^{-1}$ at $30^{\circ}C$.

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