Tylosin in anaerobic reactors : degradation kinetics, efects on methane production and on the microbial community.
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2022
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Resumo
Tylosin eliminated in animal waste, during therapeutic treatment, can be efciently removed
in anaerobic systems. The present study investigated
the infuence of tylosin concentration and assessed its
degradation kinetics and the microorganisms involved
in each stage of its anaerobic digestion (hydrolysis/
acidogenesis; acetogenesis; methanogenesis). The
results showed a stimulating efect on methane production with increasing tylosin concentration in the
poultry litter up to 80 mg kg−1 tylosin (232.9 NL
CH4 kg SV−1). As for tylosin degradation, greater removal of antibiotics was observed in the methanogenic phase (88%), followed by acetogenic (84%)
and hydrolytic/acidogenic (76%) phases. The higher
rate of tylosin degradation obtained in the methanogenic step, is mainly related to the co-metabolic efect
exerted by the presence of acetate and its degradation by acetoclastic methanogens. Indeed, metagenomic analyses suggested a syntrophic action between
archaea of the genus Methanobacterium, and bacteria
such as Clostridium and Flexilinea, which seemed
decisive for tylosin degradation.
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Poultry litter, Veterinary antibiotic, Methanogenesis, Acetogenesis, Metagenomics
Citação
PARANHOS, A. G. de O. et al. Tylosin in anaerobic reactors: degradation kinetics, efects on methane production and on the microbial community. Biodegradation, v. 1, p. 283-300, 2022. Disponível em: <https://link.springer.com/content/pdf/10.1007/s10532-022-09980-3.pdf?pdf=button>. Acesso em: 11 out. 2022.