Factors stimulating propagation of legionellae in cooling tower water
- Gifu Univ. (Japan)
The authors survey of cooling tower water demonstrated that the highest density of legionellae, {ge}10{sup 4} CFU/100 ml, appeared in water containing protozoa, {ge}10{sup 2} MPN/100 ml, and heterotrophic bacteria, {ge}10{sup 6} CFU/100 ml, at water temperatures between 25 and 35C. Viable counts of legionellae were detected even in the winter samples, and propagation, up to 10{sup 5} CFU/100 ml, occurs in summer. The counts of legionellae correlated positively with increases in water temperature, pH, and protozoan counts, but not with heterotrophic bacterial counts. The water temperature of cooling towers may promote increases in the viable counts of legionellae, and certain microbes, e.g., protozoa or some heterotrophic bacteria, may be a factor stimulating the propagation of legionellae.
- OSTI ID:
- 7051495
- Journal Information:
- Applied and Environmental Microbiology; (United States), Journal Name: Applied and Environmental Microbiology; (United States) Vol. 58:4; ISSN 0099-2240; ISSN AEMID
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
200200* -- Fossil-Fueled Power Plants-- Waste Management
ANIMALS
BACTERIA
BIOLOGICAL FOULING
CFU
COOLING TOWERS
FOULING
INVERTEBRATES
LEGIONELLA PNEUMOPHILA
MICROORGANISMS
PH VALUE
POLLUTION
POPULATION DENSITY
PROTOZOA
STIMULATION
TEMPERATURE DEPENDENCE
VIABILITY
WATER POLLUTION