The Inactivation and Microbial Regrowth Inhibition of Heterotrophic and Nitrifying Bacteria by Chloramination

클로라민 소독에 의한 종속영양세균과 질산화세균의 불활성화 및 재성장 억제

  • 조관형 (청운대학교) ;
  • 김평청 (국립환경연구원) ;
  • 우달식 ((재)한국계면공학연구소) ;
  • 조영태 (충청대학)
  • Published : 2001.06.01

Abstract

This study was performed to evaluate the inactivation and microbial regrowth of heterotrophic and nitrifying bacteria using chloramine as a secondary disinfectant for drinding water distribution system. Three sets of the three reactors filled with the $Cl_2/NH_3-N$ ratio of 3:1, 4:1, and 5:1 were used in these experiments. Chloramine concentration were applied to each set of the reactors with $1mg/\ell$,\;2mg/\ell\;and\;3mg/\ell$, respectively. For the set with elapsed time and reached to zero level after 7 days. Heterotrophic bacteria remarkably increased and nitrification through the experimenatal period (21 day). Furthermore the regrowth of heterotrophic bacteria and nitrification were not found. More than $2mg/\ell$ of chloramine with $Cl_2/NH_3-N$ ratio of 3:1, the nitrification could be inhibited by 2 days of contact time.

Keywords

chloramination;inactivation;microbial regrowth;heterotrophic bacteria;nitrifying bacteria;water distribution system

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