Journal of Korean Society of Water and Wastewater (상하수도학회지)

The Korean Society of Water and Wastewater (대한상하수도학회)
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The Characteristics of Sediment and a Design Method for Preventing Sediment in domestic sanitary sewers

분류식 오수관내 퇴적특성과 퇴적방지를 위한 설계법 고찰

  • 황환국 (한국건설기술연구원 건설환경연구실) ;
  • 김영진 (한국토지주택공사 토지주택연구원) ;
  • 한상종 (한국건설기술연구원 건설환경연구실) ;
  • 이정민 (한국토지주택공사 토지주택연구원)
  • Received : 2009.03.18
  • Accepted : 2009.12.08
  • Published : 2009.12.15
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Abstract

This study is the result of a field survey of four sewer networks selected from in domestic sanitary sewers. The main purpose of this study is to understand the characteristics of sediment in domestic sanitary sewers and to verify sewer design criteria using minimum Shear Stess for preventing sedimnet. This investigation was carried out at a total of 22 points in the four areas. The characteristics of the sanitary solids that were sampled for suspended solids and bedload matter showed a specific gravity of 1.09, a median particle size of 1.26mm, and 88.9% organic contents. On the other hand, deposited sediment was found at 6 points out of the 22 monitoring points. The analysis results of disposed sediment showed a specific gravity of 2.16, a median particle size of 1.31mm, and 15% organic contents. In flow velocity, the majority of deposited sites have under 0.6m/s. However, one-site which was in large-diameter collector sewers, has recorded over 0.6m/s. The analysis results of tractive force showed that the ability of tractive force has to be $1.5{\sim}2.0N/m^2$ to prevent sediment in domestic Sanitary sewers. In conclusion, to prevent sediment it is necessary to apply a design velocity criteria higher than 0.6m/s in the large diameter collector sewer.

Keywords

Acknowledgement

Supported by : 한국토지주택공사

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