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Recirculating Integrated System for the Treatment of Authentic Integrated-textile-dyeing Wastewater from Dyeing Industrial Complex

염색산업단지 종합폐수처리용 재순환 통합시스템

  • Lee, Eun Ju (Department of Chemical Engineering, Daegu University and Research Institute for Industrial and Environmental Waste Air Treatment) ;
  • Lim, Kwang-Hee (Department of Chemical Engineering, Daegu University and Research Institute for Industrial and Environmental Waste Air Treatment)
  • 이은주 (대구대학교 화학공학과, 산업 및 환경폐가스 연구소) ;
  • 임광희 (대구대학교 화학공학과, 산업 및 환경폐가스 연구소)
  • Received : 2017.11.06
  • Accepted : 2017.11.21
  • Published : 2017.12.01

Abstract

A recirculating integrated system composed of a fluidized biofilter filled with waste-tire crumb media fixed with return sludge from wastewater treatment facility of D dyeing industrial center, and a UV/photocatalytic reactor packed with calcined $TiO_2$ coated-glass beads as photocatalyst-support, was constructed and was run to treat authentic textile-dyeing wastewater from D-dyeing industrial center, which was mixed with an alkaline polyester-weight-reducing wastewater and a wastewater from sizing process. As a result, its total removal efficiency(RE(tot)) of $COD_{cr}$ and colors were ca. 81% and 55%, respectively. The synergy effect of the recirculating integrated system to enhance total removal efficiency(RE(tot)) of $COD_{cr}$ and colors were evaluated at most ca. 7% and 3%, respectively. The fluidized biofilter and the UV/photocatalytic reactor were responsible for ca. 94% and 6% of the total $COD_{cr}$ removal efficiency, respectively, and were also responsible for ca. 86% and 14% of the total color-removal efficiency, respectively. Thus, the degree of the UV/photocatalytic reactor-unit process's contribution to RE(tot) of color, was about 2.4 times of that to RE(tot) of $COD_{cr}$. Therefore, the UV/photocatalytic reactor facilitated the more effective elimination of colors by breaking down the chemical bonds oriented from colors of dyes such as azo-bond, than $COD_{cr}$. In addition, the effect of the removal efficiency of each unit process(i.e., the fluidized biofilter or the UV/photocatalytic reactor) of the recirculating integrated system on RE(tot) of $COD_{cr}$ and colors, was analysed by establishing its model equation with an analytic correlation.

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