The Effect of Meadow Irrigation with Biologically Treated Sewage on Occurrence of Micro-Organism Indicatory of Pollution and Sanitary State and of Potentially Pathogenic Bacteria in the Grass
S. Niewolak, S. Tucholski
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Olsztyn Department of Agriculture and Technology; 1Department of Ecology, Sanitary Microbiology Unit; 2Department of Land Reclamation and Environmental Development, Olsztyn-Kortowo, Poland
Pol. J. Environ. Stud. 1999;8(1):39–46
Studies were carried out to determine numbers of bacteria indicatory of pollution (TVC 20°C, TVC 37°C) and sanitary state (TC, FC, FS, Clostridium perfringens), and of potential pathogens (Aeromonas hydrophila, Staphylococcus sp., Pseudomonas aeruginosa, Salmonella sp.) and fungi in meadow grass subject to 8 different variants of irrigation and fertilization in the vicinity of ei treatment plant in Olsztynek (Masurian Lake District). Studies were performed in the vegetation season in the course of 2 consecutive annual cycles in 1996 and 1997.
Psychrophilic ammonifiers (TVC 20°C) were the most numerous group of bacteria in all 8 variants of irrigation and fertilization. They were especially numerous in the grass of the third swath (in autumn). As regards the bacteria indicatory of sanitary state, TC and FS were the most numerous, and from among pathogens - Aeromonas hydrophila and Staphylococcus sp., Clostridium perfringens, Pseudomonas aeruginosa and Salmonella sp. were rare. Fungi determined on Trichophyton Agar 1 medium were fairly numerous. TC, FS, Aeromonas hydrophila, and fungi grown on Trichophyton Agar I were usually more numerous in grass from plots irrigated with biologically-treated sewage and treated sewage from a biological pond. Their maximal numbers were found in grass of the 2nd and/or 3rd swath.
There were no statistically significant differences (a <= 0.05) among amounts of bacteria groups in grass from the 8 experimental fields.