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KMID : 0613820060160040579
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Journal of Life Science
2006 Volume.16 No. 4 p.579 ~ p.583
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Efficiency of Different Disinfectants against Biofilm on Carbon Steel Pipe and Carbon Utilizing Ability of Biofilm
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Lee Dong-Geun
Lee Jae-Hwa
Lee Sang-Hyeon
Ha Bae-Jin
Ha Jong-Myung
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Abstract
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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 ㎎/ℓ) and free chlorine- (0.5, 1.0 ㎎/ℓ) treated samples (P = 0.56, ANOVA). However treatment of 1.5 ㎎/ℓ free chlorine and 2.0 ㎎/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.
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KEYWORD
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Monochloramine, free chlorine, biofilm, carbon steel pipe, drinking water, CLPP
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