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http://dx.doi.org/10.5352/JLS.2006.16.4.579

Efficiency of Different Disinfectants against Biofilm on Carbon Steel Pipe and Carbon Utilizing Ability of Biofilm  

Lee, Dong-Geun (Department of Pharmaceutical Engineering, College of Medical and Life Sciences, Silla University)
Lee, Jae-Hwa (Department of Pharmaceutical Engineering, College of Medical and Life Sciences, Silla University)
Lee, Sang-Hyeon (Department of Pharmaceutical Engineering, College of Medical and Life Sciences, Silla University)
Ha, Bae-Jin (Department of Pharmaceutical Engineering, College of Medical and Life Sciences, Silla University)
Ha, Jong-Myung (Department of Pharmaceutical Engineering, College of Medical and Life Sciences, Silla University)
Publication Information
Journal of Life Science / v.16, no.4, 2006 , pp. 579-583 More about this Journal
Abstract
The influence of disinfectant on bacterial concentration and carbon usage patterns by Biolog GN plates were investigated for biofilm on carbon steel pipe. Heterotrophic bacterial concentrations were not different among non-, monochloramine- (1.0, 1.5 mg/l) and free chlorine- (0.5, 1.0 mg/l) treated samples (P = 0.56, ANOVA). However treatment of 1.5 mg/l free chlorine and 2.0 mg/l monochloraime showed significantly lower densities than control (P < 0.01, ANOVA). By the stepwise increasement of disinfectant concentration, the carbon usage activities of biofilm microflora were decreased after increase without the decrease of bacterial concentration, following reduction of cell density. Carbon usage patterns were qualitatively and quantitatively different with similar bacterial concentrations. Principal component analysis suggested that type and concentration of disinfectant were main factors on the usage of carbons. Our result suggest that the differences of bacterial communities were different among the samples and the need of monochloramine for the reduction of biofilm in drinking water.
Keywords
Monochloramine; free chlorine; biofilm; carbon steel pipe; drinking water; CLPP;
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