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Nutrients removal and microbial activity for A2O Process Using Activated Sludge Models

활성슬러지 모델을 이용한 A2O공법 영양염류 제거 및 미생물 거동

  • 윤현식 (한국환경공단 수계관리처) ;
  • 김덕진 (한국환경공단 토양지하수처) ;
  • 최봉호 (한양대학교 건설환경공학과) ;
  • 김문일 (한양대학교 건설환경공학과)
  • Received : 2012.07.02
  • Accepted : 2012.12.12
  • Published : 2012.12.15

Abstract

In this study, simulation results of nitrogen and phosphorus removals and microbial activities for an $A_2O$ process in wastewater treatment plant are presented by using Activated Sludge Models (ASMs). Simulations were performed using pre-calibrated model and layout implemented in GPS-X simulation software. The models were used to investigate variations of SRT, water temperature, DO and C/N ratio effect on nutrients removal and microbial activity. According to the simulated results, the successful nitrification required SRT higher than 10.3 days, whereas increase of $NO_3$-N loading in the anaerobic reactor caused phosphorus release by PAOs; the effluent $NH_4$-N showed rapid change between $12^{\circ}C$(21.7 mg/L) and $13^{\circ}C$(3.2 mg/L); the effluent phosphorus was increased up to 1.9 mg/L at water temperature of $25^{\circ}C$; the DO increase was positive for heterotrophs and autotrophs growths but negative for PAOs growth; the PAOs showed low activity when C/N ratio was lower than 2.5. The experimental results indicated that the calibrated models can assure the prediction quality of the ASMs and can be used to optimize the $A_2O$ process.

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