Heterotrophic Bacteria in Terms of Free Chlorine Residuals in water Distribution Systems

수돗물 배급수 계통의 유리잔류염소농도에 따른 종속영양세균의 거동에 관한 연구

  • Yoon, Tae-Ho (Water Technology Research Institute Seoul Metropolitan Government, Water Quality Research Division) ;
  • Lee, Yoon-Jin (Dept. of Environmental Engineering, Konkuk University) ;
  • Rhee, Ok-Jae (Water Technology Research Institute Seoul Metropolitan Government, Water Quality Research Division) ;
  • Lee, Euk-Wang (Water Technology Research Institute Seoul Metropolitan Government, Water Quality Research Division) ;
  • Kim, Hyun (Dept. of Environmental Engineering, Konkuk University) ;
  • Lee, Dong-Chan (Dept. of Environmental Engineering, Konkuk University) ;
  • Nam, Sang-Ho (Dept. of Environmental Engineering, Konkuk University)
  • 윤태호 (서울시 수도기술연구소 수질연구부 수질관리과) ;
  • 이윤진 (건국대학교 환경공학과) ;
  • 이옥재 (서울시 수도기술연구소 수질연구부 수질관리과) ;
  • 이의광 (서울시 수도기술연구소 수질연구부 수질관리과) ;
  • 김현 (건국대학교 환경공학과) ;
  • 이동찬 (건국대학교 환경공학과) ;
  • 남상호 (건국대학교 환경공학과)
  • Published : 2002.09.01


This study was to observe the occurrence of heterotrophic bacteria in terms of free chlorine residuals in two different water distribution systems belong to both K and Y water treatment plant. The data analyzed in this study showed that in distribution systems(DS), the free chlorine residuals were decreased from 0.10 to 0.56 ㎎/1 for K, and 0.51 and 0.78 ㎎/l for Y The decay of free chlorine were clearly higher in both March and August than those in January. The HPC in DS were ranged from 0 to 40 CFU/ml for K,0 to 270 CFU/ml for Y, on R2A medium. In particular, Its level was relatively high at consumers' ground storage tanks, taps and point-of-end area of Y, The predominant genera found in the distribution systems were Acinetobacter, Sphingomonas (branch of Pseudomonas), Microroccus, Bacillus, Staphylococcus. The diversity of heterotrophic bacteria was increased in the end-point area. Most of them were either encapsulated cells or cocci of gram-positve. In conclusion, the point-of-end area in distribution systems showed that the longer flow distance from WTP the greater diversity and higher level of heterotrophic bacteria due to the significant decay of free chlorine residuals.


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