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Comparison of Biofilm Removal Characteristics by Chlorine and Monochloramine in Simulated Drinking Water Distribution Pipe  

Park, Se-Keun (Department of Environmental Engineering, Kangwon National University)
Choi, Sung-Chan (Department of Environmental Science & Biotechnology, Hallym University)
Kim, Yeong-Kwan (Department of Environmental Engineering, Kangwon National University)
Publication Information
Journal of Korean Society of Environmental Engineers / v.28, no.1, 2006 , pp. 26-33 More about this Journal
Abstract
This study investigated the characteristics of the biofilm removal by free chlorine or monochloramine. The simulated drinking water distribution pipes on which biofilms had been formed were supplied with tap water containing 0.5, 1.0, 2.0 mg/L of free chlorine or monochloramine residuals. The biofilm removal was characterized by measurement of attached HPC and biomass on pipe surfaces. Chlorine was more effective in both inactivation of attached viable heterotrophic bacteria and removal of biofilm biomass compared to monochloramine. Biofilm matrix was not much eliminated from the surfaces by monochloramine disinfection. Free chlorine residual of 2.0 mg/L was found to be effective in biomass removal. However, biofilm level as low as $10CFU/cm^2$ of attached HPC and $5{\mu}g/cm^2$ of biomass still remained on the surfaces at 2.0 mg/L of chlorine residual. The measurement of biomass appeared to be a useful means in evaluating the characteristics of biofilm removal.
Keywords
Biofilm; Drinking Water Distribution Pipe; Chlorine; Monochloramine; Biomass;
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