Multiple disinfection processes of Legionella pneumophila positive in hotels' water distribution systems in Jordan

01.Sep.2019

​Legionella pneumophila was detected in 47.4% of the samples taken from three hotels' water distribution systems examined, while in 29.8% counts exceeded 1,000 CFU L-1. The highest positive legionella contamination in point-of-use is observed in cold sink (33%) followed by hot showerhead (22.2%) with higher mean value obtained in: 4.11 and 3.85 CFU L-1 , respectively. Multiple disinfection processes (MDP) was applied at Legionella pneumophila positive in hotels' water distribution systems while the water system was kept in operation throughout the MDP cycles. The aim of this study is to statistically assess the synergetic effects of MDP at Legionella pneumophila positive in hotels' water distribution systems. After the first application of the MDP procedure, the Legionella pneumophila prevalence has not achieved complete reduction but only reduced in the three hotels from 69.2% to 23.1%, 16.7% to 6.7%, and 92.9% to 50%, respectively. However, the result from the second application of MDP was satisfactory, and negative Legionella pneumophila prevalence was observed in the three hotels. The MDP application seems to be efficient enough to eliminate legionellae when repeatedly applied twice within 21 d.

https://www.researchgate.net/publication/335703821_Multiple_disinfection_processes_of_Legionella_pneumophila_positive_in_hotels'_water_distribution_systems_in_Jordan​