Journal of Korean Society of Water and Wastewater (상하수도학회지)

The Korean Society of Water and Wastewater (대한상하수도학회)
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A study on the removal of particulate matters using unidirectional flushing

단방향 플러싱에 의한 입자성 물질의 제거에 관한 연구

  • Kim, Dooil (Civil and Environmental Engineering, Dankook University) ;
  • Cheon, Subin (Civil and Environmental Engineering, Dankook University) ;
  • Hyun, Inhwan (Civil and Environmental Engineering, Dankook University)
  • 김두일 (단국대학교 토목환경공학과) ;
  • 천수빈 (단국대학교 토목환경공학과) ;
  • 현인환 (단국대학교 토목환경공학과)
  • Received : 2015.04.22
  • Accepted : 2015.06.11
  • Published : 2015.06.15
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Abstract

Particulate matters in a water distribution system are main causes of turbidity and discoloration of tap water. They could be removed by conventional or uni-directional flushing in a water distribution system. The behaviors and required flow velocity of particles are not well known for their flushing. A model water main and hydrant were made from transparent acrylic pipe of 30mm and 16mm in diameter, respectively. We analyzed the effect of flushing velocity, particle density, and particle diameter. We found that the existence of break-though velocities at which particles begin to be removed, and which are affected by their physical properties. The removal efficiencies seemed to be influenced by resuspension capabilities related to their upward movement from the bottom. Heavy particles like scale were hard to remove through upflow hydrant because the falling velocity, calculated using Stokes' law, was higher. Particle removal efficiencies of upward hydrant and downward drain showed minor differences. Additionally, the length between hydrant and control valve affected flushing efficiency because the particulate matters were trapped in this space by inertia and recirculating flow.

Keywords

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