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Freezing Inactivation of Escherichia Coli and Enterococcus Faecalis in Water: Response of Different Strains

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The effect of freezing temperature (−7, −15, −30 and −80°C), number of freeze/thaw cycles (1 to 5 cycles) and sample volume (100 mL and 100 µL) on the viability of a pathogenic and an opportunistically pathogenic Escherichia Coli, a vancomycin-resistant and a vancomycin-sensitive Enterococcus Faecalis were examined. About 3.3 to 4.3 and 1.5 to 2.4 log reduction in cell density were observed in E. coli and E. faecalis, respectively, in the 100 mL samples frozen at −30°C or warmer. Freezing at −80°C was the least effective in killing the microbes, on average the log reduction at −80°C was approximately 1.0 to 1.5 units less than those achieved at the three warmer temperatures. Based on statistical analysis, cell inactivation levels achieved at −7, −15, or −30°C were not significantly different (P-value  =  0.1648). There were no statistical difference in terms of log reduction obtained under all experimental conditions for the two E.coli strains (P-value  =  0.46) and the two E. faecalis strains (P-value  =  0.10). The number of freezing/thaw cycles and sample volume, however, profoundly affected inactivation capacity of freezing. Freezing could be an effective method for further reduction of E. coli and Enterococcus in municipal wastewater/sludge.
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Keywords: E. coli; Enterococcus faecalis; Freezing treatment; O157:H7; antibiotic resistant fecal bacteria; wastewater

Document Type: Research Article

Publication date: 2009-08-01

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    Water Environment Research (WER) publishes peer-reviewed research papers, research notes, state-of-the-art and critical reviews on original, fundamental and applied research in all scientific and technical areas related to water quality, pollution control, and management. An annual Literature Review provides a review of published books and articles on water quality topics from the previous year.

    Published as: Sewage Works Journal, 1928 - 1949; Sewage and Industrial Wastes, 1950 - 1959; Journal Water Pollution Control Federation, 1959 - Oct 1989; Research Journal Water Pollution Control Federation, Nov 1989 - 1991; Water Environment Research, 1992 - present.
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