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Effect of Water Temperature on Bacterial Killing in Laundry

Published online by Cambridge University Press:  02 January 2015

J.A. Smith ,
K.R. Neil ,
C.G. Davidson  and
R.W. Davidson
J.A. Smith*
Affiliation:
Division of Medical Microbiology and Department of Hospital Services, Vancouver General Hospital, Vancouver, British Columbia
K.R. Neil
Affiliation:
Division of Medical Microbiology and Department of Hospital Services, Vancouver General Hospital, Vancouver, British Columbia
C.G. Davidson
Affiliation:
Division of Medical Microbiology and Department of Hospital Services, Vancouver General Hospital, Vancouver, British Columbia
R.W. Davidson
Affiliation:
Division of Medical Microbiology and Department of Hospital Services, Vancouver General Hospital, Vancouver, British Columbia
*
Division of Medical Microbiology, Vancouver General Hospital, 855 West 12th Avenue, Vancouver, British Columbia V5Z 1M9
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Abstract

The increasing cost of energy directed our attention to testing the feasibility of low temperature washing. Hospital laundries use formulated chemicals at high temperature wash waters of 66°C. Wash water effluents and fabric bacterial counts of heavily soiled linen were correlated with alkalinity and temperature measurements to investigate the bacterial killing action of hot and cold wash formulas. Terry towels were found to be contaminated with 107 to 109 organisms per 100 cm2 at the beginning of the washing process. The most common gram-negative rods found were Klebsiella, Enterobacter and Serratia species. Staphylococci were the predominant gram-positives. Both cold and hot water washing including the bleach cycle reduced bacterial counts in fabric by 3 log10. Similarly, wash water cfu/mL declined 3 to 4 log10. A further 0.5 to 1.0 log10 reduction was effected in the 93.3°C drying cycle. Low temperature wash formulas were comparable to high temperature laundry with respect to bacterial counts and species. Cold water formulas at 31.1°C offer an alternative method to reduce energy consumption and maintain bacteriological and esthetic linen quality.

Type
Original Articles
Information
Infection Control & Hospital Epidemiology , Volume 8 , Issue 5 , May 1987 , pp. 204 - 209
Copyright
Copyright © The Society for Healthcare Epidemiology of America 1987

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