SHORT COMMUNICATION
The Impact of Nano-Silver Doses
on Microorganism-Deactivation Effectiveness
in Water Circulating in a Cooling Tower Cycle
Ewelina Podgórni, Joanna Boguniewicz-Zabłocka, Iwona Kłosok-Bazan
Faculty of Mechanical Engineering, Opole University of Technology,
Mikołajczyka 5, 45-271 Opole, Poland
Mikołajczyka 5, 45-271 Opole, Poland
Submission date: 2015-03-25
Final revision date: 2015-05-11
Acceptance date: 2015-05-11
Publication date: 2015-09-21
Pol. J. Environ. Stud. 2015;24(5):2321–2327
KEYWORDS
TOPICS
ABSTRACT
Cooling towers are specific heat exchangers that provide perfect conditions for microorganism growth.
Currently used disinfection methods involving the use of chlorine, chlorine dioxide, UV, or ozone are effective;
however, they have many drawbacks. Silver nanoparticles have become one of the most commonly used
nano-materials because of their effective antimicrobial properties and low toxicity to mammalian cells.
The purpose of our research was to determine the effectiveness of a biocide containing nano-silver; the size
of silver particles on the silica surface did not exceed 20 nm. The biocide (the patent for its recipe is currently
pending) was proportioned into water taken from the refrigerating cycle of a cooling tower supplied from
surface water intake. In this study five doses of biocide were investigated. Comparison of the effectiveness
of doses for both mesophilous and psychrophilic organisms was performed. The toxicity assay substantiated
the efficacy of silver nanoparticles, but questioned the reliability of nano-silver biocide because of the aquatic
environmental hazard.
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