KSBB Journal

The Korean Society for Biotechnology and Bioengineering (한국생물공학회)
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Treatment of highly concentrated organic wastewater by high efficiency $UV/TiO_{2}$ photocatalytic system

고효율 자외선/광촉매 시스템을 이용만 고농도 유기성 폐수처리

  • Kim, Jung-Kon (Department of Environmental Engineering, BK21 Team for Biohydrogen Production, Chosun University) ;
  • Jung, Hyo-Ki (Department of Bio Materials Engineering, Chosun University) ;
  • Son, Joo-Young (Department of Environmental Engineering, BK21 Team for Biohydrogen Production, Chosun University) ;
  • Kim, Si-Wouk (Department of Environmental Engineering, BK21 Team for Biohydrogen Production, Chosun University)
  • 김중곤 (조선대학교 환경공학부, BK21 바이오수소생산 핵심 사업팀) ;
  • 정효기 (조선대학교 생물신소재학과) ;
  • 손주영 (조선대학교 환경공학부, BK21 바이오수소생산 핵심 사업팀) ;
  • 김시욱 (조선대학교 환경공학부, BK21 바이오수소생산 핵심 사업팀)
  • Published : 2008.02.29
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Abstract

Food wastewater derived from the three-stage methane fermentation system developed in this lab contained high concentration organic substances. The organic wastewater should be treated through advanced wastewater treatment system to satisfy the "Permissible Pollutant Discharge Standard of Korea". In order to treat the organic wastewater efficiently, several optimum operation conditions of a modified $UV/TiO_{2}$ photocatalytic system have been investigated. In the first process, wastewater was pre-treated with $FeCl_{3}$. The optimum pH and coagulant concentration were 4.0 and 2000mg/L, respectively. Through this process, 52.6% of CODcr was removed. The second process was $UV-TiO_{2}$ photocatalytic reaction. The optimum operation conditions for the system were as follows: UV lamp wavelength, 254 nm; wastewater temperature, $40^{\circ}C$; pH 8.0; and air flow rate, 40L/min, respectively. Through the above two combined processes, 69.7% of T-N and 70.9% of CODcr contained in the wastewater were removed.

음식물쓰레기를 처리하기 위한 3단계 메탄발효시스템으로부터 유출되는 음식물 발효 폐액은 고농도 유기성 폐수이다. 유기성 폐수는 고도처리 시스템에 의해 방류기준에 적합하게 처리되어져야만 한다. 본 연구에서는 유기성 폐수를 처리하기 위해 고효율 $UV/TiO_{2}$ 광촉매 산화공정의 최적 운전 조건을 조사하였다. 첫 번째 공정에서 폐수에 응집제인 $FeCl_{3}$를 전처리 하였으며, 응집을 위한 최적 pH와 응집제의 농도는 각각 pH 4와 2000 mg/L이었다. 이 공정을 통하여 최대 52.6%의 COD가 제거되었다. 두 번째는 $UV/TiO_{2}$ 광촉매 산화공정으로, 최적 운전 조건은 중심파장이 254 nm, 폐수 온도 및 pH가 각각 $40^{\circ}C$와 pH 8, 반응기 주입 공기량이 40 L/min인 것으로 조사되었다. 응집제를 이용한 전처리 공정과 광촉매 산화공정을 병합하여 최적조건에서 폐수를 처리할 경우 T-N과 COD의 제거율은 각각 69.7%와 70.9% 이었다.

Keywords

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