A study of Ozone Oxidation of Methylene Blue

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 $30^{\circ}C$.

Methylene Blue의 오존(O3) 산화반응에 관한 연구

본 연구에서는 methylene blue의 오존 산화하는 동안 BOD, COD, TOC, 흡광도 그리고 탈색 비율을 분석하였으며, 오존산화반응은 methylene blue가 충진되어 있는 원형모양의 반응기에서 수행한 결과 다음과 같은 결론을 얻었다. 탈색도는 최대파장(${\lambda}_{max}$, 660 nm)에서 흡광도를 측정하였다. 오존농도는 $50{\pm}10mg/L$를 사용하였으며 40 min 후 거의 오존산화반응이 끝났다. 그 결과로 $30^{\circ}C$에서 오존산화 반응 후 $TOC/TOC_0$ 비율은 83.8%로 나타났고, COD는 초기값보다 44.0% 감소하였다. 그리고 $BOD_5/COD$ 비율은 64.2%에서 90.8%로 오존산화 반응 후 생분해도가 증가하는 것으로 나타났다. 반응속도상수는 $3.30{\times}10^{-2}min^{-1}$로 나타났으며, 활성화 에너지는 $3.01kcal{\cdot}mol^{-1}$로 나타났다.