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Chapter 31 : Biofilm Formation and Multiplication of Legionella on Synthetic Pipe Materials in Contact with Treated Water under Static and Dynamic Conditions
Biofilm Formation and Multiplication of Legionella on Synthetic Pipe Materials in Contact with Treated Water under Static and Dynamic Conditions, Page 1 of 2< Previous page Next page > /docserver/preview/fulltext/10.1128/9781555817985/9781555812300_Chap31-1.gif /docserver/preview/fulltext/10.1128/9781555817985/9781555812300_Chap31-2.gif
The growth-promoting properties of 10 selected synthetic materials, as well as copper and stainless steel, were tested in static (batch) experiments at 25°C and also in a dynamic (flowthrough) test at ambient temperature simulating flow conditions in a household plumbing system. The study objectives were (i) to compare the microbial growth-promoting properties of various synthetic materials with those of copper and stainless steel under static and dynamic test conditions, (ii) to determine the effect of the materials on the multiplication of Legionella, and (iii) to evaluate the materials on the basis of the obtained results. The Legionella growth potential (LegGP) (CFU/cm2) of the materials in the biomass production potential (BPP) test was calculated from the concentrations of Legionella in water and in biofilm after 56, 84, and 112 days of incubation of the flasks with the material samples. The results of the static test reveal that materials may affect biofilm formation at long periods of stagnation and a temperature of 25°C. However, in practice also, water contributes to biofilm formation. Data about biofilm concentrations and Legionella in plumbing systems are needed to enable a quantitative evaluation of the BPP and biofilm formation potential (BFP) values as observed for the various materials in the static test.