Applied Biological Chemistry

The Korean Society for Applied Biological Chemistry (한국응용생명화학회)
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Soybean Wastewater Treatment by Activated Sludge Process

고농도 대두가공폐수의 처리를 위한 개선 활성슬러지법

  • Cho, Kwon-Ik (Department of Food Science and Technology, Woosuk University) ;
  • Lee, Jeoung-Su (Department of Civil Enginneering, Woosuk University) ;
  • Lee, Tae-Kyoo (Department of Food Science and Technology, Woosuk University) ;
  • Kim, Jong-Hwa (Department of Food Science and Technology, Woosuk University)
  • Published : 2002.02.28
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Abstract

The kernel of wastewater treatment by activated sludge is elimination of organic substances and maintenance of well-flocculated sludge sedimentation. By the conventional activated sludge treatment, the optimum F/M ratio of soybean wastewater treatment was 0.24 (kg-BOD/kg-MLVSS day) and sludge bulking was generated at 0.48 (kg-BOD/kg-MLVSS day). To improve the treatment capacity and operation quality in higher loading of soybean wastewater, influent pH was constantly controlled by 9.0 using NaOH as a coagulant agent. In this process, higher loading up to 2.88 (kg-BOD/kg-MLVSS day) was possible and SVI was maintained under 150 without bulking. This was equivalent to 7.2 times higher than maximum permissible load of the conventional activated sludge process.

활성슬러지에 의한 생물학적 폐수처리에 있어 주된 관리인자는 유기물의 효율적인 제거와 슬러지의 침강성을 일정치 이하로 유지하는 것이다. 식품폐수의 하나인 고농도의 대두가공폐수를 일반적인 활성슬러지법을 적용한 결과 최적 F/M비(food-to-microorganism ratio)는 0.24(kg-BOD/kg-MLVSS day)였으며 그 이상의 농도인 0.48(kg-BOD/kg-MLVSS day)에서는 슬러지 팽화현상이 발생하여 고농도의 식품폐수처리에는 효율적이지 못하였다. 이를 개선하기 위하여 응집보조제(NaOH)를 활용하여 유입폐수의 pH를 9.0으로 조절한 결과, 2.88(kg-BOD/kg-MLVSS day)의 고농도 폐수를 유입하여도 슬러지의 팽화현상없이 SVI(sludge volume index)를 150 이하로 유지하였다. 이것은 최대 허용부하를 일반적인 활성슬러지법에 비하여 7.2배 높일 수 있는 효율적인 방법으로 평가되었다.

Keywords

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