Biologia, Bratislava 55/3: 235-242, 2000.

ISSN 0006-3088 (Biologia). ISSN 1335-6399 (Biologia. Section Cellular and Molecular Biology).


Full Paper

Surface water bacterial plankton in the vicinity of two nuclear power stations in Slovakia.


Darina Sladekova*, Miloslava Proksova & Dezider Toth

Institute of Microbiology, Slovak Academy of Sciences, Stefanikova 3, SK-81434 Bratislava, Slovakia; tel: ++421 7 52492365, fax: ++421 7 52493824, e-mail:

* corresponding author

Received: August 17, 1999 / Accepted: February 16, 2000



Environmental impact on microbial population of surface waters during construction and operation of two Slovak nuclear power plants (NPPs) was studied. The study covers the period of construction and trial operation start-up of the Unit 1 of NPP Mochovce (PMO) and the period of NPP Jaslovske Bohunice (PBO) operation, from July 1996 to June 1999. Our attention was focused on the incidence of groups of microorganisms indicating general pollution in waters (psychrophilic, mesophilic and spore-forming bacteria) as well as hygienically important bacterial factors of faecal pollution (enterococci, coliform, thermotolerant coliform bacteria and presumptive Escherichia coli, estimated by the most probable number method). Water samples were taken from selected localities in the vicinity of both stations monthly or bi-monthly. Since 1997 144 strains of Enterobacteriaceae family in both places were identified. The analysis of bacterial spectra showed that during the three year period, the industrial wastewater outflows neither contributed to the bacterial contamination, nor affected negatively the bacterial biotopes of recipients and waters of Vah and Hron rivers.


Key words: nuclear power plant, microbial indicators, wastewater, Slovakia.