ORIGINAL RESEARCH
Occurrence of Fungi in Water Distribution System
A. Grabińska-Łoniewska1, T. Koniłłowicz-Kowalska2, G. Wardzyńska1,
K. Boryn3
1Institute of Environmental Engineering Systems, Warsaw Technical University,
Nowowiejska 20, 00-653 Warsaw, Poland
2Department of Agricultural Microbiology, Mycological Laboratory, Academy of Agriculture,
Leszczyńskiego 7, 20-069 Lublin, Poland
3Municipal Water Supply and Wastewater Company, Warsaw City, Plac Starynkiewicza 5, 02-015 Warsaw, Poland
Pol. J. Environ. Stud. 2007;16(4):539–547
KEYWORDS
ABSTRACT
It is demonstrated that contamination of water distribution systems with fungi is determined by the
number and species composition of the mycoflora of waters supplying a given Water Treatment Plant
(WTP) and the effectiveness of their removal in the unit processes of water treatment used. In the water distribution
system examined, a significant number of microorganisms occurring in waters supplying the WTP
was reduced in the water supplied to the system to 200 cfu l-1 following sorption, coagulation, filtration
and disinfection processes. Their number did not exceed 267 cfu l-1 in the water phase in the distribution
system while it was as many as 1000-5000-times greater in the biomass “suspended” in it. These organisms
occurred sporadically in pipe sediments. Moulds, including species pathogenic and potentially pathogenic
to humans and warm-blooded animals, constituted the mycoflora.
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