Adsorption properties of natural zeolite and bentonite in pig slurry from the microbiological point of view
1999
Venglovsky, J. | Pacajova, Z. | Sasakova, N. (Vyskumny Ustav Veterinarnej Mediciny, Kosice (Slovak Republic)) | Vucemilo, M. | Tofant, A.
The influence of zeolite and bentonite on physical-chemical and microbiological parameters of pig slurry was studied. After 28 days of contact of pig slurry either with zeolite or with bentonite, the plate counts of psychrophilic and mesophilic microorganisms decreased by 3 orders of magnitude in comparison with the control. The efficiency of removal of psychrophilic and mesophilic microorganisms was 98.9 % and 100 %, respectively. Coliform microorganisms were not detected after 14 days of the treatment of slurry either with zeolite or with bentonite. No fecal coliform microorganisms were detected in bentonite-treated slurry after 7 days of contact and in zeolite-treated slurry after 14 days of contact. During the experiment a decrease in the concentration of ammonium nitrogen (N-NH+4), total nitrogen (Nt), total phosphorus (Pt) and chemical oxygen demand (COD) was observed.
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