Naslov
Hygienic and ecological risk connected with the survival of Salmonella typhimurium in the solid fraction pig slurry from agricultural wastewater treatment plant

Autori
Placha, Iveta ; Venglovsky, Jan ; Novak, Pavel ; Tofant, Alenka ; Vučemilo, Marija

Izvornik
Stočarstvo (0351-0832) 54 (2000), 3; 163-174

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
Salmonella typhimurium;indicator microorganisms; survival; pig farm; wastewater treatment plant

Sažetak
The survival of Salmonella typhimurium and the dynamic of indicator microorganisms (psychrophilic, mesophilic, fecal coliforms, coliforms, fecal streptococci) at different temperatures (4, 20 degrees) in the solid fraction of pig slurry were studied. Under laboratory conditions the investigated strain of S. typhimurium survived on a leather carrier at 20 degrees until day 97 of the investigation. The decimation time value (T 90) was 3.59 days. The decimation time of indicator microorganisms ranged from 30.69 days (fecal streptococci) to 189.19 days (coliforms). A significant dependance of the survival time of psychrophilic and mesophilic microorganisms on the dry matter as well as an influence of the dry matter upon the survival of fecal streptococci could be proved. In coliform microorganisms and fecal streptococci the effects of ammonia nitrogen were also observed. In indicator microorganisms storage time of the solid fraction notably influenced survival. The investigated strain of Salmonella typhimurium survived on a carrier stored at 4 degrees 135 days, which corresponds with T 90 value of 41.12 days. Decimation time values in indicator microorganisms ranged from 82.54 days (fecal streptococci) (psychrophilic microorganisms). Statistics significance could be proved for the dependence of survival time of mesophilic microorganisms and fecal streptococci on ammonia nitrogen and of the coliforms, fecal coliforms and fecal streptococci upon total nitrogen. In fecal streptococci and fecal coliforms a profound influence of pH was also observed. With the exception of psychrophilic and mesophilic microorganisms, storage time of the solid fraction has statistically significant effects of upon the survival of indicator microorganisms.

Izvorni jezik
Engleski

Znanstvena područja
Šumarstvo

POVEZANOST RADA