Journal of Korean Society of Water and Wastewater (상하수도학회지)

The Korean Society of Water and Wastewater (대한상하수도학회)
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Evaluation of the Effect of Sedimentation Basin Structure on Hydrodynamic Behavior using CFD(I): The Effect of Longitudinal Baffle

CFD를 이용한 침전지 구조가 수리거동에 미치는 영향 평가(I): 도류벽의 영향

  • 박세진 (한국수자원공사 수자원연구원) ;
  • 박노석 (한밭대학교 토목, 환경, 도시 공학부) ;
  • 임재림 (한국수자원공사 수자원연구원) ;
  • 김선규 (한국수자원공사 수자원연구원) ;
  • 김석구 (한국수자원공사 수자원연구원) ;
  • 문용택 (한국수자원공사 수자원연구원) ;
  • 방기웅 (한국수자원공사 수자원연구원)
  • Received : 2005.08.02
  • Accepted : 2006.09.26
  • Published : 2006.10.15
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Abstract

This study was conducted to evaluate the effect of longitudinal baffle on hydrodynamic behavior within a certain full-scale sedimentation basin (flow rate per basin; $1,000m^3/d$). Comparative experimental investigations have been carried out on the sediment removal efficiencies and the sludge deposit distribution in the baffled and un-baffled sedimentation basin, respectively. From the results derived in the baffled and un-baffled sedimentation, the turbidity removal rate in the baffled sedimentation basin is about 38% higher than that in un-baffled. Also, the height of sludge deposit in the baffled sedimentation basin is approximately 20% lower, and the sludge concentration is 10% higher than those in un-baffled sedimentation basin. In order to explain the experimental results and investigate the effect of longitudinal baffle in more detail, we conducted Computational Fluid Dynamics (CFD) simulation. From the results of CFD simulation, the flow, especially in the near of outlet orifice, was more stable in the case of longitudinal baffled sedimentation basin than that in un-baffled basin. Also, it could be concluded that the longitudinal baffle made a fully developed flow more effective for sedimentation.

Keywords

References

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