Journal of Korean Society on Water Environment (한국물환경학회지)

Korean Society on Water Environment (한국물환경학회)
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Study on Change of Microbial Activity and Removal Efficiency of Phosphorus with Alum Injection in the Biological Process

생물학적 처리공정 내 Alum 주입에 따른 인 처리 효율과 미생물 활성도 변화에 관한 연구

  • Choi, Jung Su (Department of Environmental Energy System Engineering, Graduate School Kyonggi University) ;
  • Joo, Hyun Jong (Department of Environmental Energy System Engineering, Kyonggi University)
  • 최정수 (경기대학교 일반대학원 환경에너지시스템공학과) ;
  • 주현종 (경기대학교 환경에너지시스템공학과)
  • Received : 2011.01.15
  • Accepted : 2011.02.08
  • Published : 2011.03.30
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Abstract

The effects of coagulants on the microorganisms when they are injected directly into the biological treatment facility for T-P removal have been easily observed from the results of past experiments. As such this study is set out to derive the effective plans for the coagulant dosage by analyzing the effects of the injected coagulant on the microbial activity during the chemical treatment for T-P removal. The research methods entailed the assessment of removal efficiency of T-P according to the coagulant dosage while changing the molar ration between Alum and influent phosphorus. At the same time Specific Oxygen Uptake Rate (SOUR) according to the coagulant dosage was measured. SOUR was used as a method for indirect assessment of the microbial activity according to the coagulant dosage. The results from the study showed that with the increase in the alum dosage, the removal efficiency T-P tended to increase. On the other hand, the increase in coagulant dosage resulted in the decrease in SOUR, which indicates the decrease in the microbial activity. Such reduction in the activity could be explained by the increase in the concentration of removal efficiency of $TBOD_5$. Based on experiment results from the study, it is determined that coagulant dosage affects the microbial activity. Moreover, the indirect assessment on the microbial activity using SOUR is considered possible.

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