Journal of Korean Society of Water and Wastewater (상하수도학회지)

The Korean Society of Water and Wastewater (대한상하수도학회)
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Case Study on Remodeling Outlet Structure within a Sedimentation Basin for Improving Performance

침전지 유출부 구조 Remodeling을 통한 개선사례 연구

  • 김성수 (한국수자원공사 수자원연구원 국제상하수도연구소) ;
  • 박노석 (한국수자원공사 수자원연구원 국제상하수도연구소) ;
  • 문용택 (한국수자원공사 수자원연구원 국제상하수도연구소) ;
  • 이선주 (한국수자원공사 수자원연구원 국제상하수도연구소)
  • Received : 2006.10.25
  • Accepted : 2006.12.11
  • Published : 2006.12.15
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Abstract

This study was conducted to evaluate the effect of the launder type on settling performance and hydrodynamic behavior within the two certain full-scale sedimentation basins (each flow rate/one basin; $10,000m^3/d$); one is the transverse typed launder(existing basin) and the other is building the finger type launder in combination with the longitudinal baffle. Comparative experimental investigations have been carried out through residual turbidity and particle concentration measurements in each effluent from two basins with the transverse and the finger type launders, respectively. From the experimental results, we could observe that turbidity removal rate in the finger type launder basin (modified basin) is about 30% higher than that in the transverse type launder basin (existing basin). Also, from the measurement of total particle concentration in each effluent, the removal efficiency was improved about 27% within modified basin compared to the existing basin. In order to explain the comparative experimental results and investigate the hydridynamic behavior within each basin in more detail, we conducted computational fluid dynamics (CFD) simulation and verified simulation results with acoustic Doppler velocimetry (ADV) technique. From the CFD simulation, it was investigated that extreme upward flow occurs underneath of the transverse launder. On the other hand, in the case of modified basin, the upward flow, which occurred in the beneath of launder, was much less than that in the existing basins.

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References

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