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Paper Information

Journal:   PETROLEUM RESEARCH   SPRING 2015 , Volume 25 , Number 81; Page(s) 136 To 144.
 
Paper: 

INVESTIGATION AND DETECTION OF LEGIONELLA PNEUMOPHILA IN IRANIAN OIL REFINERIES’ COOLING TOWERS

 
 
Author(s):  SOHEILI MAJID*, TIRANDAZ HASSAN, KAVEH AHANGAR RAFAT, HEYDARIAN ABDALRASOUL
 
* MICROBIOLOGY AND BIOTECHNOLOGY RESEARCH GROUP, ENVIRONMENTAL AND BIOTECHNOLOGY DIVISION, RESEARCH INSTITUTE OF PETROLEUM INDUSTRY, TEHRAN, IRAN
 
Abstract: 

Regarding the presence of appropriate conditions for the growth of Legionella pneumophila in cooling tower water, the population of this bacterium can rapidly increase in contaminated systems. When these waters are aerosolized, small re- spirable-sized droplets containing Legionella can reach the respiratory system of the susceptible person and cause Legionnaires’ disease. Legionnaires’ disease is a severe form of pneumonia that can be lethal if not detected in the early stage of contamination. In this research, the contamination of five Iranian oil refinery cool- ing towers with L. pneumophila was investigated by culture-dependent methods. The results showed that cooling towers in three refineries were contaminated by L. pneumophila. Seasonal investigation showed that in these cases bacterial count almost were more than 100 CFU/ml. In the two cases, in some seasons, bacterial counts were 1000 CFU/ml and in one another case it was 800 CFU/ml, which all were in the risk limit. The results showed that cooling tower water treatment and their management in some refineries were not sufficient and must be modified as soon as possible. Using suitable biocide and system cleaning along with extra at- tention on anti-microbial treatment should be applied.

 
Keyword(s): LEGIONELLA PNEUMOPHILA, LEGIONNAIRES’ DISEASE, BCYE-A AGAR, COOLING TOWER, IRANIAN REFINERIES, AEROSOL
 
References: 
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