Hygiena 2020, 65(2):52-55 | DOI: 10.21101/hygiena.a1744

Biocides used for legionella prevention in hot water systems

Ivan Černý
Ekologická laboratoř PEAL s.r.o., Praha, Česká republika

Objective: The objective of the paper was to verify the effects of several biocides used in the Czech Republic for prevention of legionella in hot water systems. Selected biocides were tested (sodium hypochlorite, chlorine dioxide, chlorites and chlorates) as well as compounds (DUOZON, SANOSIL).

Method: A natural strain of Legionella pneumophila, sg 1, isolated during regular testing of warm water samples was used for testing. Because control strains lose some of their properties in storage they are inappropriate for this type of testing. The testing strain was exposed to varying concentrations of biocides in tap water for a 60 minute period to determine the lowest possible concentration at which legionella plankton forms were destroyed. Legionella counts prior to and after exposure were determined according to CSN EN ISO 11731. Biocide concentrations were measured at the start of each test.

Results: Tested biocides were compared according to their lowest effective concentrations: 1) chlorine dioxide (0.2 mg/l), 2) sodium hypochlorite and DUOZON (0.7 mg/l as Cl), 3) SANOSIL (100 mg/l), 4) trisodium phosphate (600 mg/l) and, 5) sodium chlorate (1,000 mg/l).

Conclusion: The tested biocides commercially available in CR were at constant dosing adequately effective as prevention against legionella in warm water.

Keywords: biocide - activity, Legionella, hot water - quality

Received: January 2020; Accepted: May 13, 2020; Published: May 31, 2020  Show citation

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Černý I. Biocides used for legionella prevention in hot water systems. Hygiena. 2020;65(2):52-55. doi: 10.21101/hygiena.a1744.
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