Journal of Korean Society on Water Environment (한국물환경학회지)

Korean Society on Water Environment (한국물환경학회)
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Evaluation of Operation Characteristics with Aeration Time in Intermittent Aeration Membrane Bioreactor

간헐포기 MBR공정에서 포기시간에 따른 운전특성 평가

  • Lim, Bong-Su (Department of Environmental Engineering, Daejeon University) ;
  • Choi, Bong-Cheol (Department of Environmental Engineering, Daejeon University)
  • Received : 2005.03.07
  • Accepted : 2005.04.25
  • Published : 2005.07.30
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Abstract

This study was conducted to evaluate the operation characteristics with aeration time in intermittent aeration membrane bioreactor. The BOD removal efficiency rate of this process was over than 97% regardless of aeration on/off time. To get over than 82% of nitrogen removal efficiency rate, aeration off time needs more than 70 minutes in reactor. Specific denitrfication rate was 2.68 mg $NO_3-N/gMv/hr$ in 40/80 min aeration on/off time, was 2.6 times more than 60/60 min, and 1.4 times more than 50/70 min in 6,300 mg/L of MLSS concentration. Specific nitrification rate was 1.96 mg $NH_4-N/gMv/hr$ in 50/70 min, was 1.4 times more than 40/80 min, but it was effectded little upon nitrification. Microbial activity was effected little according to aeration on/off time, oxygen demend was reduced according to aeration off time increased and microbial concentration increased. The longer aeration off time become, the higher Extraceller Pollymeric Substance (EPS), 50/70 min and 40/80 min in aeration on/off time was increased 1.6 times and 2.7 times, respectively more than 60/60 min because of increase of operation pressure.

Keywords

Acknowledgement

Supported by : 한국과학재단

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