Journal of Korean Society of Water and Wastewater (상하수도학회지)

The Korean Society of Water and Wastewater (대한상하수도학회)
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Hydraulic consideration to improve the tractive force of sewage in sewer pipes using a storage tank

관로내 하수흐름의 전단응력 향상을 위한 저수조의 활용에 관한 수리적 고찰

  • Park, Kyoohong (Dept. of Civil Engineering at Chung-Ang University) ;
  • Yu, Soonyu (Dept. of Consilience, ADD at Korea Polytechnic University) ;
  • Lee, Taehoon (Dept. of Civil Engineering at Chung-Ang University)
  • 박규홍 (중앙대학교 사회기반시스템공학부) ;
  • 유순유 (한국산업기술대학교 지식융합학부) ;
  • 이태훈 (중앙대학교 사회기반시스템공학부)
  • Received : 2018.10.08
  • Accepted : 2019.03.04
  • Published : 2019.04.15
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Abstract

If sewage flows for an extended time at low velocities, solids may be deposited in the sewer. Sufficient velocity or tractive force should be developed regularly to flush out any solids that may have been deposited during low flow periods. This study aims to evaluate the periods (T) during which sewage flow greater than the minimum tractive force maintains on a spot in sewer pipe system with lower tractive force or lower velocity than expected in the design step, when a storage tank installed in a place upsteam pours water into the sewer. The effect to T of design factors of storage tank and sewer pipes was evaluated assuming the uniform flow in sewers. When the area of orifice in the storage tank is $0.062m^2$(or 0.28 m diameter), the maximum T of 31sec was maintained using the usually used preset range of values of several design factors. As the horizontal cross section of storage tank and water depth of storage tank and roughness in sewers increase, T linearly increases. Also, T linearly decreases as the diameter of a sewer pipe increases. Although T gradually decreases as the sewer pipe slope decreases to around 0.005, T decreases sharply when the slope is less than 0.003.

Keywords

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