Korean Chemical Engineering Research

The Korean Institute of Chemical Engineers (한국화학공학회)
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Treatment of an Authentic Textile-dyeing Wastewater Utilizing a Fluidized Biofilter and Hybrid Recirculating System Composed of the Fluidized Biofilter and a UV/photocatalytic Reactor

실제 혼합염색폐수의 유동상 시스템을 활용한 미생물처리와 하이브리드 재순환시스템처리

  • Lee, Eun Ju (Department of Chemical Engineering, Daegu University) ;
  • Lim, Kwang-Hee (Department of Chemical Engineering, Daegu University)
  • Received : 2015.01.02
  • Accepted : 2015.01.22
  • Published : 2015.02.01
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Abstract

A fluidized biofilter was filled with Pseudomonas sp. and Bacillus cereus/thuringiensis-fixed waste-tire crumb media and was run to treat authentic textile-dyeing wastewater mixed with alkaline polyester-weight-reducing wastewater. As a result, its removal efficiency of $COD_{Cr}$ and color were 75~80% and 67%, respectively. In addition, upon constructing hybrid-recirculating system composed of the fluidized biofilter and a 450 W-UV/photocatalytic reactor, only fluidized biofilter was run bypassing UV/photocatalytic reactor at stage I. Subsequently, the hybrid system was continuously run at stage II-i, ii and iii. At stage II-i, the total removal efficiency of $COD_{Cr}$ was enhanced to be 80~85%, compared to 75% at stage I, owing to 20~30% removal efficiency of the UV/photocatalytic reactor. However, at stage II-i, the total removal efficiency of color was enhanced to be 65~70%, compared to 45~65% at stage I, even though the removal efficiency of the UV/photocatalytic reactor was tantamount to merely 0~5%. As far as the removal efficiency of fluidized biofilter of the hybrid-recirculating system is concerned, its removal efficiency of color was enhanced by the synergy effect of the hybrid-recirculating system unlike $COD_{Cr}$. Besides, despite of the increase of hybrid-recirculating system-recycle ratio, the deactivation of photo-catalytic activity was scarcely observed to eliminate the color while its irreversible deactivation was observed to eliminate $COD_{Cr}$.

D염색공단의 폴리에스테르 알카리 감량폐수가 혼합된 실제 혼합염색폐수를 처리하기 위하여 Pseudomonas sp. 및 Bacillus cereus/thuringiensis를 고정한 폐타이어담체를 충전한 유동상 바이오필터를 운전하였다. 또한 유동상 바이오필터와 450 W의 UV/광촉매반응기를 결합한 하이브리드 재순환시스템을 구축하여 stage I에서는 UV/광촉매반응기를 바이패스하고 유동상 바이오필터만을, stage II-i, ii, iii에서는 하이브리드 재순환시스템을 각각 운전하였다. 유동상 바이오필터만을 사용하였을 경우에 $COD_{Cr}$ 및 색도 제거효율은 각각 75~80% 및 67%를 나타내었다. 한편 하이브리드 재순환시스템 운전에서 stage I에서 stage II-i로 전환되었을 때에 UV/광촉매산화공정의 $COD_{Cr}$ 제거율이 20~30%에 달하여 총 $COD_{Cr}$ 제거율은 75%로부터 80~85%까지 제고되었다. 한편 stage I에서 stage II-i로 전환되었을 때에 UV/광촉매산화공정의 색도제거율은 0~5%에 불과하였으나 총 색도제거율은 45~65%로부터 65~70%까지 제고되었다. 색도 제거에서는 $COD_{Cr}$ 제거와 다르게 UV/광촉매산화공정에 의하여 유동상 바이오필터의 효율이 제고되어서 하이브리드 재순환시스템의 시너지효과가 나타났다. 또한 색도제거에서는 $COD_{Cr}$ 제거와 다르게 반송비 증가에 따른 광촉매 비활성화가 관찰되지 않았고, $COD_{Cr}$ 제거에서 반송비 증가에 따른 광촉매 비활성화는 비가역적으로 관찰되었다.

Keywords

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