Journal of Korean Society on Water Environment (한국물환경학회지)

Korean Society on Water Environment (한국물환경학회)
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Factors Affecting Chemical Disinfection of Drinking Water

  • Lee, Yoon-jin (Department of Environmental Engineering, Konkuk University) ;
  • Nam, Sang-ho (Department of Environmental Engineering, Konkuk University) ;
  • Jun, Byong-ho (Department of Civil Engineering, Korea Military Academy) ;
  • Oh, Kyoung-doo (Department of Civil Engineering, Korea Military Academy) ;
  • Kim, Suk-bong (Department of Civil Engineering, Korea Military Academy) ;
  • Ryu, Jae-keun (Department of Environmental Engineering, Chungju National University) ;
  • Dionysiou, Dionysios D. (Department of Civil and Environmental Engineering, University of Cincinnati) ;
  • Itoh, Sadahiko (Department of urban Management, Kyoto University)
  • Published : 2004.03.30
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Abstract

This research sought to compare chlorine, chlorine dioxide and ozone as chemical disinfectants of drinking water, with inactivation of total coliform as the indicator. The inactivation of total coliform was tested against several variables, including the dose of disinfectant, contact time, pH, temperature and DOC. A series of batch processes were performed on water samples taken from the outlet of a settling basin in a conventional surface water treatment system that is provided with the raw water drawn from the mid-stream of the Han River. Injection of 1 mg/L of chlorine, chlorine dioxide and ozone resulted in nearly 2.4, 3.0 and 3.9 log inactivation, respectively, of total coliform at 5 min. To achieve 99.9 % the inactivation, the disinfectants were required in concentrations of 1.70, 1.00 and 0.60 mg/L for chlorine, chlorine dioxide and ozone, respectively. Bactericidal effects generally decreased as pH increased in the range of pH 6 to 9. The influence of pH change on the killing effect of chlorine dioxide was not strong, but that on ozone and free chlorine was sensitive. The activation energies of chlorine, chlorine dioxide and ozone were 36,053, 29,822 and 24,906 J/mol for coliforms with inactivation effects being shown in the lowest orders of these.

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References

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