engleski

The influence of addition of natural and synthetic zeolite on microbiological parameters in the liquid fraction of pig slurry.

The study focused on problems related to harmless disposal of pig slurry, particularly on the influence of addition of powder zeolite from Nizny Hrabovec, Slovakia, Montanit 300 from Slovenia and synthetic zeolite prepared by hydrothermal alteration of power plant fly ash to the liquid fraction of pig slurry with regard to the microbiological aspects. Plate counts of psychrophilic, mesophilic, coliform and fecal coliform bacteria were determined after different period of contact of the slurry with zeolites (24 h, 48 h, 7, 14 and 28 days). The addition of zeolites resulted in a decrease in plate counts of the observed groups of germs in the supernatant. The decrease, expressed in per cent, differed considerably, particularly with psychrophilic germs (5-89%). The highest decrease was observed in fecal coliform bacteria after adding synthetic zeolite (95.7%). The best mean decrease for all groups of microorganisms studies was reached with Montanit 300. The effect of zeolites may be evaluated positively also in relation to considerable reduction of chemical pollution in the liquid fraction of pig slurry.

powder zeolite; pig slurry; bacterial plate counts

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