Naslov
Pig slurry hygienization with hydrogen peroxide - silvercomplex, an environmentally acceptable disinfectant

Autori
Tofant, Alenka ; Pavičić, Željko ; Matković, Kristina ; Hađina, Suzana ; Križanić, Josip

Izvornik
Veterinarski arhiv (0372-5480) 73 (2003), 6; 345-353

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

Ključne riječi
hygienization ; pig slurry ; disinfectant ; hydrogen peroxide - silver complex

Sažetak
Liquid fraction of the pig slurry sampled at the site of draining into aerobic lagoon was treated with a hydrogen peroxide-based disinfectant with silver ions for catalytic action in order to define a hygienically acceptable substrate according to its organoleptic, physicochemical and especially microbiologic properties, intended for environmental disposal. In the in vitro experiment using substrate mixture with the disinfectant at a final concentration of 2%, time of action of 1 hour, and efficacy control at 24 hours, the following results were observed: the dark, turbid, green-brown, malodorous slurry samples turned light and the intensity of malodor declined substantially. The concentration of ammonium ions and nitrite decreased significantly (p<0.01 and p<0.05, respectively), whereas the nitrate concentration increase (p<0.05) was presumably due to oxidation. Oxidizing processes led to a significant reduction (p<0.01) in the biochemical oxygen demand (BOD5), however, its value of 1992.50  244.59 mgO2/L still was ecologically unacceptable to be drained into waters. The percentage of dry matter and sedimentation decreased (p<0.05), pH showed a slight increase, whereas the proportion of organic matter and electric conductivity remained unchanged. The number of mesophilic and total coliform bacteria decreased significantly (p<0.01). The efficacy of disinfection expressed as log10 reduction factor (RF) was 3.23 for mesophilic bacteria and 3.12 for total coliform bacteria, showing a >99% reduction of their number. The results obtained in the study pointed to efficient hygienization with hydrogen peroxide and silver ions, rendering pig slurry a more acceptable substrate to be disposed off in the environment.

Izvorni jezik
Engleski

Znanstvena područja
Veterinarska medicina

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