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Biofilm formation comparison of the SANIPACKING® cooling tower fill material against standard polypropylene fill material in a recirculating model water system

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Cooling towers are heat rejection systems that are used in some industrial applications, and they have the potential to develop infectious concentrations of Legionella pneumophila. | İ. TÜRETGEN, N. Ö. ŞANLI YÜRÜDÜ, I. NORDEN Turk J Biol 36 (2012) 313-318 © TÜBİTAK doi:10.3906/biy-1103-5 Biofilm formation comparison of the SANIPACKING® cooling tower fill material against standard polypropylene fill material in a recirculating model water system İrfan TÜRETGEN1, Nazmiye Özlem ŞANLI YÜRÜDÜ1, Imke NORDEN2 1 Department of Biology, Faculty of Science, İstanbul University, 34134 Vezneciler, İstanbul - TURKEY 2 GEA 2H Water Technologies GmbH, Wettringen - GERMANY Received: 04.03.2011 Abstract: Cooling towers are heat rejection systems that are used in some industrial applications, and they have the potential to develop infectious concentrations of Legionella pneumophila. SANIPACKING® cooling tower fill material and standard polypropylene fill material were compared in terms of biofilm formation potential and anti-Legionella activity within a 4-month period using a laboratory-scale recirculating water system. The recirculating water system was experimentally infected with a L. pneumophila standard strain (ATCC 33152) suspension and operated continuously until all experiments had been completed. Results showed that the L. pneumophila rapidly multiplied in a short time during the study within the model system bulk water. No L. pneumophila was isolated from the SANIPACKING® surface during the 4-month period, whereas intensive colonization occurred on the standard polypropylene material surface in the first month. Heterotrophic bacterial counts on the surfaces showed that a significantly low accumulation was recorded on the SANIPACKING® surface in comparison to the standard polypropylene material. Total bacterial counts on surfaces, determined by epifluorescence microscopy (using DAPI), revealed that significantly low counts of microorganisms colonized on the SANIPACKING® surface. Key words: Biofilm, SANIPACKING®, Legionella, cooling tower, fill material Model su sisteminde SANIPACKING® soğutma kulesi dolgu malzemesi ile standart polipropilen .