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KMID : 1156220060320030215
Journal of Environmental Health Sciences
2006 Volume.32 No. 3 p.215 ~ p.221
Impact of Water Quality Parameters on the Disinfection of Total Coliform with Chlorine Dioxide
Lee Yoon-Jin

Abstract
This study investigated the inactivation of the total coliform, an indicator organism in chlorine dioxide, in order to assess the optimal disinfection procedure for drinking water treatment and distribution systems. This research focus on a number of factors, including the dosage of disinfectant, contact time, pH, temperature and DOC. Water samples were taken from the outlet of a settling basin at a conventional surface water treatment system. As the pH increased in the range of pH 6-9, the bactericidal effects of disinfectants decreased. Changes in levels of pH did not significantly after the disinfection effect of chlorine dioxide for total coliform. With an increase in temperature, there was a subsequent increase in the bactericidal effects of disinfectants. Thus, it is evident that a decrease in temperature will higher the CT values required to inactivate coliform for during the winter. DOC addition can also reduce total coliform inactivation. DOC is the most significant variable in total coliform inactivation with chlorine dioxide.
KEYWORD
total coliform, chlorine dioxide, water parameter, disinfection
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