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

Eun Ju Lee, Kwang-Hee Lim
2015 Korean Chemical Engineering Research  
요 약 D염색공단의 폴리에스테르 알카리 감량폐수가 혼합된 실제 혼합염색폐수를 처리하기 위하여 Pseudomonas sp. 및 Bacillus cereus/thuringiensis를 고정한 폐타이어담체를 충전한 유동상 바이오필터를 운전하였다. 또한 유동상 바이오필 터와 450 W의 UV/광촉매반응기를 결합한 하이브리드 재순환시스템을 구축하여 stage I에서는 UV/광촉매반응기를 바 이패스하고 유동상 바이오필터만을, stage II-i, ii, iii에서는 하이브리드 재순환시스템을 각각 운전하였다. 유동상 바이 오필터만을 사용하였을 경우에 COD Cr 및 색도 제거효율은 각각 75~80% 및 67%를 나타내었다. 한편 하이브리드 재 순환시스템 운전에서 stage I에서 stage II-i로 전환되었을 때에 UV/광촉매산화공정의 COD Cr 제거율이 20~30%에 달 하여 총 COD Cr 제거율은 75%로부터 80~85%까지 제고되었다. 한편 stage I에서 stage II-i로
more » ... e I에서 stage II-i로 전환되었을 때에 UV/광 촉매산화공정의 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 비활 성화가 관찰되지 않았고, COD Cr 제거에서 반송비 증가에 따른 광촉매 비활성화는 비가역적으로 관찰되었다. 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 IIi, 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 .
doi:10.9713/kcer.2015.53.1.71 fatcat:a7iwx3kkobfqdk5jnw7voyorya