Journal of Korean Society of Environmental Engineers (대한환경공학회지)

Korean Society of Environmental Engineers (대한환경공학회)
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Effect of Microbubble Ozonation Process on Performance of Biological Reactor System for Excess Sludge Solubilisation

마이크로버블오존을 이용한 잉여슬러지 가용화 처리가 생물반응조의 성능에 미치는 영향

  • Lee, Shun-Hwa (Department of Environmental Engineering, Yeungnam University) ;
  • Jung, Kye-Ju (Department of Environmental Engineering, Yeungnam University) ;
  • Kwon, Jin-Ha (Department of Environmental Engineering, Yeungnam University) ;
  • Lee, Se-Han (Department of Environmental Engineering, Yeungnam University)
  • 이순화 (영남대학교 건설환경공학부 환경공학) ;
  • 정계주 (영남대학교 건설환경공학부 환경공학) ;
  • 권진하 (영남대학교 건설환경공학부 환경공학) ;
  • 이세한 (영남대학교 건설환경공학부 환경공학)
  • Received : 2010.02.07
  • Accepted : 2011.02.28
  • Published : 2011.02.28
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Abstract

The study purpose was to examine an effect of zero emission of excess sludge on biological reactor and treated water quality within the biological reactor in the process of biological treatment combined with excess sludge reduction system with ozone. Under an ozone injection rate 0.03 g $O_3/g$ SS, Sludge Disintegration Number (SDN) 3 and less than pH 4 as pre-treatment process, it was possible to maintain a stable biological treatment process without sludge disintegration. In the test of $OUR_{max}$, of sludge, its value was hardly under the condition of ozone injection rate 0.03 g $O_3/g$ SS. There were almost no changes of MLVSS/MLSS within biological reactor followed by a solubilization of excess sludge. Accumulation of microorganism within biological reactor was also not observed. After solubilization of excess sludge, an increase for organic matter and SS concentrations of an effluent was not observed and T-N concentration was reduced by increasing nitrification and denitrification rate within biological reactor. Most of T-P was not removed by zero emission of excess sludge and was leaked by being included in effluents.

오존을 이용한 잉여슬러지 감량화 시스템이 결합된 생물학적 처리 공정에서 잉여슬러지의 무배출에 따른 생물반응조내의 영향 및 처리수질을 검토하였다. 잉여슬러지 인발량 배수($SDN_{min}$)가 3인 조건에서 잉여슬러지의 pH를 4 이하로 전 처리한 후 오존주입율 0.03 g $O_3/g$ SS로 처리한 결과 잉여슬러지의 인발 없이 안정적인 생물학적 처리가 가능하였다. $OUR_{max}$ 실험 결과, 오존주입율 0.03 g $O_3/g$ SS의 조건에서 대부분의 슬러지는 미생물 활성이 없어지는 것으로 조사되었다. 잉여슬러지의 가용화에 따른 생물반응조내에서의 MLVSS/MLSS의 변화는 거의 없었고, 반응조내 미생물의 인 축적 현상도 관측되지 않았다. 잉여슬러지 가용화 후 생물학적 처리수의 유기물 및 SS의 농도 증가 현상은 관측되지 않았고, 생물반응조내의 질산화 및 탈질율 증가로 유출수중의 T-N 농도가 감소하는 효과를 나타내었다. T-P의 경우에는 잉여슬러지의 무배출로 인해 대부분이 제거되지 않고 유출수중에 함유되어 유출되는 것으로 조사되었다.

Keywords

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