Journal of Korean Society on Water Environment (한국물환경학회지)

Korean Society on Water Environment (한국물환경학회)
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A Two-Stage Process, $O_3$ and Subsequent $O_3/H_2O_2$, for Effective Color Removal from Leather-Dyeing Wastewater: Case Study in the D Industrial Wastewater Treatment Plant

피혁염색폐수의 색도저감을 위한 오존, 오존/과산화수소 2단 공정에 관한 연구: D 산업폐수처리장 사례연구

  • Yoon, Yeojoon (Department of Environmental Engineering, Yonsei University) ;
  • Park, Moonki (Department of Environmental Engineering, Yonsei University) ;
  • Kwon, Minhwan (Department of Environmental Engineering, Yonsei University) ;
  • Jung, Youmi (Department of Environmental Engineering, Yonsei University) ;
  • Kang, Joon-Wun (Department of Environmental Engineering, Yonsei University)
  • Published : 2013.01.30
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Abstract

The aim of this study is to evaluate color removal from leather-dyeing wastewater using $O_3$ and $O_3/H_2O_2$ unit processes and a serial process for $O_3$, followed by the $O_3/H_2O_2$ process. The color removal rate of the $O_3$ alone process was only 65% effective, and the color increased when an applied $O_3$ dose of more than 40 ~ 50 mg/L was applied. On the other hand, the color was completely removed without increments of color by the $O_3/H_2O_2$ process with $H_2O_2$ injection ratio of 0.2 and 0.3 (wt. $H_2O_2$/wt. $O_3$). Even though the injection of $H_2O_2$ had an effect on color removal, the color removal rates from $O_3$ alone and from $O_3/H_2O_2$ were similar up to the initial $O_3$-demand stage with an application of 0 ~ 40 mg/L $O_3$. In conclusion, it was found that the $O_3$ followed by the $O_3/H_2O_2$ serial process, the method injecting $H_2O_2$ after ozonation with $O_3$-demand (30 ~ 40 mg/L) in the first stage, is the most appropriate process for effective color removal from leather-dyeing wastewater.

본 연구에서는 오존과 오존/과산화수소 공정을 단독공정과 연속공정으로 각각 적용하여 피혁염색폐수의 색도 저감을 평가하였다. 오존 단독공정에서 색도 저감율은 65%였고, 오존 농도가 40 ~ 50 mg/L 이상으로 주입되면 오히려 색도가 증가하는 경향을 나타냈다. 반면에 오존/과산화수소 공정에서는 과산화수소 주입율을 오존 질량 대비 0.2와 0.3비율로 하였을 때, 색도의 증가 없이 완벽히 제거되었다. 비록 과산화수소의 주입이 색도 저감을 증가시키지만, 초기오존 소모량 구간에서는 과산화수소를 주입하여도 오존 단독 공정과 색도 저감율에서 큰 차이를 보이지 않았다. 결론적으로, 1단계에서 오존 단독공정으로 오존 소모량을 만족시켜주고 (30 ~ 40 mg/L), 그 이후에 과산화수소를 주입 하여 오존/과산화수소 연속 공정을 적용하는 것이 본 피혁 염색폐수의 색도 저감에 가장 효과적인 공정으로 평가되었다.

Keywords

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