BACKGROUND: We report the results of 1-year application of monochloramine to control Legionella pneumophila contamination in a hospital hot water distribution system. METHODS: In the main building of the hospital, a device continuously distributing monochloramine was installed. Legionella pneumophila and Pseudomonas spp contamination was followed in comparison with 2 other water networks in the same building using chlorine dioxide. RESULTS: Monochloramine significantly reduced the number of contaminated sites compared with baseline (from 97.0% to 13.3%, respectively), chlorine dioxide device I (from 100% to 56.7%, respectively), and device II (from 100% to 60.8%, respectively). No positive sample exceeded 10(4) colony-forming units/L versus 59.4% at baseline. CONCLUSION: Monochloramine could represent a good alternative to chlorine dioxide in controlling legionellae contamination in public and private buildings.
BACKGROUND: We report the results of 1-year application of monochloramine to control Legionella pneumophila contamination in a hospital hot water distribution system. METHODS: In the main building of the hospital, a device continuously distributing monochloramine was installed. Legionella pneumophila and Pseudomonas spp contamination was followed in comparison with 2 other water networks in the same building using chlorine dioxide. RESULTS:Monochloramine significantly reduced the number of contaminated sites compared with baseline (from 97.0% to 13.3%, respectively), chlorine dioxide device I (from 100% to 56.7%, respectively), and device II (from 100% to 60.8%, respectively). No positive sample exceeded 10(4) colony-forming units/L versus 59.4% at baseline. CONCLUSION:Monochloramine could represent a good alternative to chlorine dioxide in controlling legionellae contamination in public and private buildings.
Authors: Isabella Marchesi; Greta Ferranti; Antonella Mansi; Anna M Marcelloni; Anna R Proietto; Navneet Saini; Paola Borella; Annalisa Bargellini Journal: Appl Environ Microbiol Date: 2016-05-02 Impact factor: 4.792
Authors: Darren A Lytle; Stacy Pfaller; Christy Muhlen; Ian Struewing; Simoni Triantafyllidou; Colin White; Sam Hayes; Dawn King; Jingrang Lu Journal: Water Res Date: 2020-11-18 Impact factor: 11.236