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  • Title: Fate of veterinary antibiotics during animal manure composting.
    Author: Zhang M, He LY, Liu YS, Zhao JL, Liu WR, Zhang JN, Chen J, He LK, Zhang QQ, Ying GG.
    Journal: Sci Total Environ; 2019 Feb 10; 650(Pt 1):1363-1370. PubMed ID: 30308823.
    Abstract:
    Antibiotics are widely used in animals for disease treatment and prevention. After use, these antibiotics end up in manure. Here we investigated the fate of veterinary antibiotics in animal manure during composting and their residues in manure-applied soils. The results showed that 64.7% of the detected veterinary antibiotics were removed after composting for 171 days, which mainly occurred at the thermophilic phase in the second week, followed by a long stable stage with limited variations. The removal rates for lincomycin, trimethoprim and the macrolides during the composting were >89.7%, while those for the sulfonamides, tetracyclines and fluoroquinolones were less than <63.7%. The dissipation of antibiotics during the composting was related to the change of compost physicochemical properties, especially moisture and C/N ratio. The application of compost products with antibiotic residues could still lead to soil contamination, which may pose risks of resistance selection to the soil ecosystem.
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