Use of the Filter-Sandwich carriers in continuous effectiveness monitoring of slurry treatment methods as an element improving biosafety in agriculture
Use of the Filter-Sandwich carriers in continuous effectiveness monitoring of slurry treatment methods as an element improving biosafety in agriculture
Slurry, due to high microbiological contamination, requires hygienization before spreading. The agricultural usage of treated
slurry has to guarantee biosafety. Therefore, constant monitoring of the slurry treatment process should be conducted. The
use of Filter-Sandwich carriers seems to be a prospective solution. The aim of the research was to test whether Filter-Sandwich
carriers influence the survivability of microorganisms during the slurry hygienization process and hence, whether they are
safe for the environment. Raw cattle and swine slurry with different dry matter content was the research material. Salmonella
Senftenberg W775 rods were introduced directly into the slurry and into the carriers placed in the liquid excrements stored at
4 and 20 °C, and underwent anaerobic digestion at 35 °C. The number of tested bacteria obtained from the slurry and carriers
was determined using the MPN method with proper microbiological media. The values of physicochemical parameters of
the raw and treated slurry were determined, both for the carriers and for slurry only. Biosafety control was also conducted
for the carriers in slurry containers. The differences in the theoretical survivability between Salmonella Senftenberg W775
re-isolated from the slurry and the carriers, and in the values of the selected physicochemical parameters obtained at the
end of the process, were not statistically significant. The re-contamination of the sterile slurry caused by the bacteria in
the carrier was not observed after placement of the carrier with inoculated material. The conducted research proves the
usefulness of Filter-Sandwich carriers for continuous hygienization monitoring of the slurry treatment process. This refers
not only to the semi-technical scale, but also to the full-scale process.
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