Korean Chemical Engineering Research

The Korean Institute of Chemical Engineers (한국화학공학회)
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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
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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.

D염색공단의 폴리에스테르 알카리 감량폐수 및 호발폐수가 혼합된 실제 종합염색폐수를 처리하기 위하여 D염색공단의 종합폐수처리장 반송슬러지를 고정한 폐타이어담체를 충전한 재순환 유동상 바이오필터와 소성된 $TiO_2$ 코팅-glass bead를 광촉매담체로 적용한 UV/광촉매반응기를 결합한 재순환 통합시스템을 구축하여 운전하였다. 그 결과로서 재순환 통합시스템의 총 $COD_{cr}$ 제거율과 총 색도 제거율 추이는 각각 약 81% 및 55% 정도를 유지하였다. 이러한 재순환 통합시스템의 총 $COD_{cr}$ 및 총 색도 제거율의 제고효과는 각각 최대 약 7% 및 3%로 평가되었다. 재순환 통합시스템의 유동상 바이오필터 및 광촉매반응공정은 총 제거율에 대한 상대기여도로서 각각 총 $COD_{cr}$ 제거율의 약 94% 및 6%를 처리하고, 총 색도 제거율의 약 86% 및 14%를 처리하였다. 이와 같이 재순환 통합시스템의 광촉매반응공정에서는 총 제거율에 대한 색도 제거율의 상대기여도가 $COD_{cr}$ 제거율의 상대기여도보다 약 2.4배 정도 컸다. 따라서 본 연구의 재순환 통합시스템에서 광촉매반응공정은 $COD_{cr}$ 제거보다 아조결합과 같이 염료에서 색을 나타내는 화학결합을 깨는 역할에 더욱 효율성이 있었다. 또한 본 연구의 재순환 통합시스템에서 각 단위공정들의 $COD_{cr}$ 및 색도 제거율이, 재순환 통합시스템의 총 $COD_{cr}$ 및 색도 제거율에 미치는 영향에 대한 모델식과 대수적 상관관계를 구하고 분석하였다.

Keywords

References

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