Journal of Korean Society of Water and Wastewater (상하수도학회지)

The Korean Society of Water and Wastewater (대한상하수도학회)
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Hydraulics and water quality characteristics of flushing in distribution pipes

배수관 플러싱의 수리적 현상과 배출수의 수질 특성

  • 안재찬 (서울특별시 상수도연구원) ;
  • 이수원 (서울특별시 상수도연구원) ;
  • 백광인 (서울특별시 상수도연구원) ;
  • 최영준 (서울특별시 상수도연구원) ;
  • 최재호 (서울특별시 상수도연구원) ;
  • 정의선 (서울특별시 상수도연구원) ;
  • 박현 (서울특별시 상수도연구원) ;
  • 구자용 (서울시립대학교 환경공학부)
  • Received : 2007.07.23
  • Accepted : 2008.01.28
  • Published : 2008.02.15
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Abstract

This study was conducted to optimize a unidirectional flushing program in distribution pipes by analysis of water pressure, velocity, quality, and other parameters during flushing. As a result, correlation coefficient between flushed pipe length and the flushing duration was obtained $R^2=0.83$ and the equation $Y_{Time}=0.0571{\cdot}X_{Pipe\;length}+4.7648$ for 10 pipes. The averaged flushing velocity in the pipes, 1.1 m/s, was enough to remove loose deposits on the inner wall of the pipes. 3 of 92 water samples taken during flushing met the National Drinking Water Quality Standard for Fe and Mn, but not for Al. Turbidity less than 1 NTU is suggested for the appropriate criteria to finish flushing in pipes. The coefficient of determination ($R^2$) between turbidity and TSS was 0.95 and the equation was induced as $Y_{TSS}=1.2068{\cdot}X_{Turbidity}$. The amount of removed deposits could be estimated from the turbidity data of discharged water in field because turbidity and TSS in the discharged water is highly correlated.

Keywords

References

  1. 서울특별시 수돗물 수질평가위원회 (2001) 수돗물 불신원인 및 해소방안도출을 위한 배급수과정에서의 수질 변화 조사, 숭실대학교, pp.48-60
  2. 서울특별시 (2001) 서울특별시 수도시설이설 등 원인자 및 손괴자 부담금 징수조례 시행규칙, p.1
  3. 안재찬 등 (2005) 배수관망 플러싱 방법 조사연구-1차년도, 서울특별시 상수도연구소, pp.28-49
  4. 안재찬 등 (2006) 배수관망 플러싱 방법 조사연구-2차년도, 2005년 상수도연구집, 서울특별시 상수도연구소, p.3
  5. JPRC (1996) 管路內殘留鹽素濃度管理に關する事業體事例集, 管路內水質變化とその防止對策檢討會編, pp.47-48, p.91
  6. Ainsworth, R. et al. (2004) Safe Piped Water, IWA, pp.79-84
  7. Antoun, N. P., Tyson, T., and Hiltebrand, D. (1997) Unidirectional Flushing: A Remedy to Water Quality Problems such as Biologically Mediated Corrosion, Proceedings of Annual Conference, AWWA, 15-19 June, Atlanta, Georgia, pp.259-273
  8. AWWA (1992) Maintaining Distribution-system Water Quality, pp.37-46
  9. Chadderton R. A., G. L. Christensen and P. Henry-Unrath (1993) Planning a Distribution System Flushing Program, J. AWWA, 85(7), pp.89-94
  10. Friedman, M., Kirmeyer, G. J., and Antoun, E. (2002) Developing and implementing a Distribution System Flushing Program, J. AWWA, 94(7), pp.48-56
  11. Friedman. M. et al. (2003) Establishing Site-Specific Flushing Velocities, AWWRF, pp.121-127
  12. Gray, J. F, (1988) Pipe cleaning with foam pigs, Proceedings of Cleaning and Lining Water Mains, AWWA, 11-14 September, Boston, Massachusetts, pp.1-6
  13. Vitanage, D. et al. (2003) Assessment of the impact of mains cleaning to improve distribution water quality, Water Science and Technology: Water Supply 3(1-2), pp.71-78
  14. Yates Carl et al. (2003) Water Quality in Distribution Systems, National Guide to Sustainable Municipal Infrastructure, pp.19-20