Effect of veterinary antibiotics on biogas and bio-methane production.

Abstract This work studied the effect of three classes of veterinary antibiotics (Ceftiofur, Danofloxacin and Micospectone: a combination of Spectinomycin and Lincomycin) that are used to treat the respiratory diseases of cows and pigs on anaerobic digestion. Three different doses of antibiotics were added to a pig slurry and tested in combination with two patterns of thermal treatment performed over various times. During the anaerobic tests, such parameters as total biogas production and methane concentration in biogas were monitored. At the end of the anaerobic tests, antibiotic concentrations left in the slurries were detected. The results showed that Ceftiofur was the most degradable drug (approximately 70% of the initial content was degraded), while Danofloxacin and Lincomycin were less degradable (30–34% of the total initial content). The greatest inhibition of anaerobic digestion was observed with the drug association of Lincomycin and Spectinomycin (Micospectone), which presented the least physical degradability (heat treatment) and biological degradability.