Journal of Microbiology

The Microbiological Society of Korea (한국미생물학회)
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Reflection on Kinetic Models to the Chlorine Disinfection for Drinking Water Production

  • Lee, Yoon-Jin (Department of Environtal Engineering, College of Engineering, Komkuk University, Seoul 143-701, South Korea) ;
  • Nam, Sang-ho (Department of Environtal Engineering, College of Engineering, Komkuk University, Seoul 143-701, South Korea)
  • Published : 2002.06.01
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Abstract

Experiments for the characterization of inactivation were performed in a series of batch processes with the total coliform used as a general indicator organism based on the chlorine residuals as a disinfectant. The water samples were taken from the outlet of a settling basin in a conventional surface water treat- ment system that is provided with the raw water drawn from the mid-stream of the Han River, The inactivation of total coliform was experimentally analysed for the dose of disinfectants contact time, filtration and mixing intensity. The curves obtained from a series of batch processes were shaped with a general tailing-off and biphasic mode of inactivation, i.e. a sharp loss of bacterial viability within 15 min followed by an extended phase. In order to observe the effect of carry-over suspended solids on chlorine consumption and disinfection efficiency, the water samples were filtered, prior to inoculation with coliforms, with membranes of both 2.5$\mu$m and 11.0 $\mu$m pore size, and with a sand tilter of 1.0 mm in effective size and of 1.4 in uniformity coefficient. As far as the disinfection efficiency is concerned, there were no significant differences. The parameters estimated by the models of Chick-Wat-son, Hom and Selleck from our experimental data obtained within 120 min are: log(N/N$\_$0/)=-0.16CT with n=1, leg(N/N$\_$0/)=-0.71C$\^$0.87/ with n 1 for the Chick-Watson model, log (N/N$\_$0/)=-1.87C$\^$0.47/ T$\^$0.36/ for the Hom model, log (MHo)=-2.13log (1+CT/0.11) for the Selleck model. It is notable that among the models reviewed with regard to the experimental data obtained, the Selleck model appeared to most closely resemble the total coliform survival curve.

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References

  1. Standard methods for the examination of water and wastewater (19th edition) APHA;AWWA;WEF
  2. 5th ed. Water quality and treatment AWWA
  3. Wastewater microbiology Bitton, D.
  4. J. Boston Soc. Civil Eng. v.30 Velocity gradient and internal work in fluid motion Camp, T.R.;P.E. Stein
  5. Applied Bacteriology v.43 Tailing of survival curves of bacterial spores Cerf, O. https://doi.org/10.1111/j.1365-2672.1977.tb00717.x
  6. J. Hygiene v.8 An investigation of the laws of disinfection Chick, H. https://doi.org/10.1017/S0022172400006987
  7. J. WPCF v.51 Design optimization of high-rate disinfection using chlorine and chlorine dioxide Donald, F.G.;R.G. Steven;B.M. Cornelius
  8. AWWA Guidance manual for compliance with the filtration and disinfection requirement for public water EPA.
  9. The cholrination/chloramination handbook Gerald, F.C.
  10. Kinetics in the presence of chlorine demand. Water Research v.18 Kinetics of microbial inactivation by chlorine Ⅱ Hass, C.N.;S.B. Karra
  11. J. Sanitary Eng. Eiv v.98 Kinetics of chlorine disinfection in an ecosystem Hom, L.W.
  12. J. Environmental Engineering v.104 Kinetics of bacterial deactivation with chlorine Selleck, R.E.;B.M. Saunier;H.F. Collins
  13. Contact Facilities v.49 Rational design of chlorine Trussell, R.R.;J.L. Chao
  14. J. Hygiene v.8 A Note on the variation of the rate of disin-fection with change in the concentration of the disinfection Watson, H.E. https://doi.org/10.1017/S0022172400015928
  15. 3rd Ed. The handbook of chlorination and alternative disinfectants White, G.C.
  16. J. WPCF v.46 Disinfection practices in the San Francisco Bay area White, G.C.