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KMID : 0364820090450010074
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Korean Journal of Microbiology
2009 Volume.45 No. 1 p.74 ~ p.81
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Microbiological Water Quality of Water Purifiers at Elementary Schools in Gunsan Area
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Seo Lan-Ju
Park Seok-Hwan
Lee Geon-Hyoung
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Abstract
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In this research, we investigated the actual conditions of water purification systems at ten elementary schools located in Gunsan, Korea from July to December, 2007. The results were as follows; The population densities of heterotrophic bacteria in water purifiers ranged from 0 to 1.2±0.2×104 CFU/ml and those of tap water were in the range from 0 to 1.9±0.3×104 CFU/ml during investigation periods. Ninety percentage of purified water samples in July and September, 87.2% in October and November, and 93.7% in December turned out not to be suitable for drinking. The seasonal variation of the population densities of heterotrophic bacteria from purified waters was not notable. The total coliform, Salmonella and Shigella were not detected in purified water and tap water during investigation periods. Forty-five species of bacteria were isolated from water purifiers. The identified bacterial genera were Sphingomonas, Methylobacterium, Caulobacter, Novosphingobium, Bosea, Brevundimonas, Aminobacter, Ralstonia, Mitsuaria, Variovorax, Acidovorax, Massilia, Pseudomonas, Acinetobacter, Aeromonas, Bacillus, Staphylococcus, Brevibacillus, Microbacterium, Lapillicoccus, Micrococcus, Arthrobacter, Janibacter, Flavobacterium, Chryseobacterium, and Hymenobacter. Among the isolates, opportunistic pathogens such as Pseudomonas fluorescens, Staphylococcus epidermidis, Flavobacterium johnsoniae, and Acinetobacter johnsonii were also found.
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KEYWORD
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heterotrophic bacteria, population densities, tap water sample, total coliform, water purification systems
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