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Evaluation of the Effect of Sedimentation Basin Structure on Hydrodynamic Behavior using CFD(I): The Effect of Longitudinal Baffle  

Park, Se-Jin (한국수자원공사 수자원연구원)
Park, No-Suk (한밭대학교 토목, 환경, 도시 공학부)
Lim, Jae-Lim (한국수자원공사 수자원연구원)
Kim, Sun-Kyu (한국수자원공사 수자원연구원)
Kim, Sug-Goo (한국수자원공사 수자원연구원)
Mun, Yong-Taek (한국수자원공사 수자원연구원)
Bang, Ki-Woong (한국수자원공사 수자원연구원)
Publication Information
Journal of Korean Society of Water and Wastewater / v.20, no.5, 2006 , pp. 667-676 More about this Journal
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
Sedimentation basin; Longitudinal baffle; Hydrodynamic behavior; CFD(Computational Fluid Dynamics) simulation;
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