Influence of temperature, chlorine residual and heavy metals on the presence of Legionella pneumophila in hot water distribution systems

Anita Rakić 1, Jelena Perić 2, Lucija Foglar 3
1 - Public Health Institute, Split, Croatia
2 - Faculty of Chemistry and Technology, University of Split, Split, Croatia
3 - Division of Industrial Ecology, Faculty of Chemical Engineering and Technology, University of Zagreb, Zagreb, Croatia
Ann Agric Environ Med
2012; 19 (3):
ICID: 1010939
Article type: Original article
 
 
The microbiological colonisation of buildings and man-made structures often occurs on the walls of plumbing systems; therefore, monitoring of opportunistic pathogens such as Legionella pneumophila (L. pneumophila), both in water distribution mains and in consumers’ plumbing systems, is an important issue according to the international and national guidelines that regulate the quality of drinking water. This paper investigates the presence of L. pneumophila in the Dalmatian County of Croatia and the relationship between L. pneumophila presence and heavy metals concentrations, free residual chlorine and water temperature in hot water distribution systems (WDS). Investigations were performed on a large number of hot water samples taken from taps in kitchens and bathrooms in hotels and homes for the elderly and disabled in the Split region. Of the 127 hot water samples examined, 12 (9.4%) were positive for Legionella spp. with median values concentration of 450 cfu × L-1 . Among positive isolates, 10 (83.3%) were L. pneumophila sg 1, and two of them (16.6%) belonged to the genera L. pneumophila sg 2–14. The positive correlation between the water temperature, iron and manganese concentrations, and L. pneumophila contamination was proved by statistical analysis of the experimental data. On the contrary, zinc and free residual chlorine had no observed influence on the presence of L. pneumophila. The presence of heavy metals in water samples confirms the corrosion of distribution system pipes and fittings, and suggests that metal plumbing components and associated corrosion products are important factors in the survival and growth of L. pneumophila in WDS.
PMID 23020035 - click here to show this article in PubMed
  FULL TEXT STATS

Recommend this article to:

Name:
E-mail:
From:
Language:


Related articles in IndexCopernicus™
     heavy metals [520 related records]
     hot water distribution systems [1 related records]
     Legionella pneumophila [23 related records]
     Risk Factors [15916 related records]



 

Related articles

, ,
 ارزیابی خطر اختلالات اس...
 چکیده زمینه و هدف: با توجه به اینکه اسکله‌های بارگیری بندرعباس از مهم‌ترین مکان‌ها در فعالیت جابه‌جایی و حمل دستی کالا بوده و روزان...
ABSTRACT
T Yeh, C Lin,
Chelator-enhanced phytoextraction of copper and zi...
The phytoextraction of copper and zinc assisted by the chelators such as ethylene diamine tetraacetic acid, diethylene triamino pentaacetic acid, ethylene diamine disuccinate and citric acid into sunflowers (Hh can act as effective cation exchangers....
ABSTRACT
K Özdemir, M Dizbay,
Nosocomial infection and risk factors in elderly p...
Incidence of nosocomial infections gradually increase in patients over 65 years age population. There is a significant relationship between increased age and predisposition to nosocomial infections. Predisposition to infections in this age group is...
ABSTRACT