Journal of Korean Society of Water and Wastewater (상하수도학회지)

The Korean Society of Water and Wastewater (대한상하수도학회)
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Evaluation of Particle Removal Rate in Inclined-pipe Settling System for Stormwater Infiltration

강우유출수의 침투시 부하저감을 위한 경사관 침전장치의 효율평가

  • 김상래 (서울대학교 건설환경공학부) ;
  • 김동근 (서울대학교 건설환경공학부) ;
  • 문정수 (서울대학교 건설환경공학부) ;
  • 한무영 (서울대학교 건설환경공학부)
  • Received : 2009.09.11
  • Accepted : 2009.10.23
  • Published : 2009.12.15
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Abstract

One of the alternative runoff management measures is on-site runoff mitigation, such as rainwater retention tank and infiltration facilities especially the latter that is possible to manage simultaneously runoff quality and quantity as a perspective of water-cycle. This study was conducted to develop a particle separator, inclined-pipe settling system, that could improve particle removal efficiency of road runoff as a pre-treatment device of stormwater infiltration. Solid particles larger than $100{\mu}m$ are separated by simple sedimentation; however, the significant amount of pollutants with a diameter less than $100{\mu}m$ remain in suspension. Without any treatment in that case of the runoff into infiltrate, groundwater would be deteriorated and also infiltration rate would be decreased by clogging. Therefore, we suggest optimal design parameters (inclined angle, pipe length, and surface loading rate) of inclined-pipe settling system which can be designed to effectively remove particles diameter smaller then $70{\mu}m$. Thus, the results showed TSS removal efficiency more than 80% with a particle diameter between $20{\mu}m$ and $70{\mu}m$, 100% above particle diameter $70{\mu}m$ for the inflow rate $0.018 m^3/m^2{\cdot}hr$ with pipe inclined at angle $15^{\circ}$.

Keywords

Acknowledgement

Supported by : 서울대학교, 건설교통부

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