The influence of temperature, disinfection and water softening of drinking water on the multiplication of Legionella pneumophila
Godič Torkar, Karmen (Author), Oder, Martina (Author)

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The influence of temperature, disinfectant and water softener for drinking water preparation on the bacterial growth of Legionella pneumophila was examined.The optimal temperature for bacterial growth was 36 °C. At the incubation temperature of 15 °C the multiplying of bacteria slowed down, as confirmed by the bacteriostatic effect of this temperature. The number of bacteria was after the first 24 h of incubation at 55 °C reduced by more than 6 log in comparison to the culture at 36 °C. After 10 minutes of exposure to the disinfectant dichloroisocyanuric acid, the number of bacteria in the culture decreased for 1.4 log CFU mL-1, followed by an intensive growth immediately after the disinfectant degradation. The number of bacteria was up to 72 hours incubation even higher than in the control sample without a disinfectant, and then the number in both samples equalled at approximately 7.3 log CFU mL-1. Sodium polyphosphate used as a water softener stimulated the bacterial growth. The largest difference in growth was observed after 72 h of incubation, which was 1.9 log CFU mL-1 higher in samples with sodium polyphosphate in comparison to those without the softener.

Keywords:Legionella pneumophila, growth curve, temperature, water softener, disinfectant
Tipology:1.01 - Original Scientific Article
Organization:ZF - University College of Health Studies
Number of pages:str. 34-42
Numbering:Vol. 12, no. 1
ISSN on article:1854-0678
COBISS.SI-ID:5590123 Link is opened in a new window
License:CC BY-NC-ND 4.0
This work is available under this license: Creative Commons Attribution Non-Commercial No Derivatives 4.0 International
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Record is a part of a journal

Title:Sanitarno inženirstvo
Publisher:Inštitut za sanitarno inženirstvo
COBISS.SI-ID:216969216 This link opens in a new window

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