Browse > Article

Hydraulics and water quality characteristics of flushing in distribution pipes  

Ahn, Jae-Chan (서울특별시 상수도연구원)
Lee, Su-Won (서울특별시 상수도연구원)
Baek, Kwang-In (서울특별시 상수도연구원)
Choi, Young-June (서울특별시 상수도연구원)
Choi, Jae-Ho (서울특별시 상수도연구원)
Jeong, Eui-Sun (서울특별시 상수도연구원)
Park, Hyeon (서울특별시 상수도연구원)
Koo, Ja-Yong (서울시립대학교 환경공학부)
Publication Information
Journal of Korean Society of Water and Wastewater / v.22, no.1, 2008 , pp. 93-103 More about this Journal
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
flushing; turbidity; total suspended solids;
Citations & Related Records
연도 인용수 순위
  • Reference
1 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
2 Friedman. M. et al. (2003) Establishing Site-Specific Flushing Velocities, AWWRF, pp.121-127
3 서울특별시 (2001) 서울특별시 수도시설이설 등 원인자 및 손괴자 부담금 징수조례 시행규칙, p.1
4 Yates Carl et al. (2003) Water Quality in Distribution Systems, National Guide to Sustainable Municipal Infrastructure, pp.19-20
5 서울특별시 수돗물 수질평가위원회 (2001) 수돗물 불신원인 및 해소방안도출을 위한 배급수과정에서의 수질 변화 조사, 숭실대학교, pp.48-60
6 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
7 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
8 안재찬 등 (2006) 배수관망 플러싱 방법 조사연구-2차년도, 2005년 상수도연구집, 서울특별시 상수도연구소, p.3
9 Ainsworth, R. et al. (2004) Safe Piped Water, IWA, pp.79-84
10 AWWA (1992) Maintaining Distribution-system Water Quality, pp.37-46
11 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
12 Friedman, M., Kirmeyer, G. J., and Antoun, E. (2002) Developing and implementing a Distribution System Flushing Program, J. AWWA, 94(7), pp.48-56
13 안재찬 등 (2005) 배수관망 플러싱 방법 조사연구-1차년도, 서울특별시 상수도연구소, pp.28-49
14 Chadderton R. A., G. L. Christensen and P. Henry-Unrath (1993) Planning a Distribution System Flushing Program, J. AWWA, 85(7), pp.89-94