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Evaluation of bacterial diversity in a swine manure composting system contaminated with veterinary antibiotics (VAs)

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Abstract

Composting has become an alternative for the treatment of organic effluents, due to its low cost, easy handling, and a great capacity for treating swine manure. As it is a biological process, many microorganisms are involved during the composting process and act in the degradation of organic matter and nutrients and also have the ability to degrade contaminants and accelerate the transformations during composting. The objective of this work was to identify microorganisms present in the swine effluent composting system, under the contamination by most used veterinary drugs in Brazil. The composting took place for 150 days, there was an addition of 200 L of manure (these 25 L initially contaminated with 17 antibiotics) in 25 kg of eucalyptus wood shavings. The microorganisms were measured at times (0 until 150 days) and were identified by the V3-V4 regions of the 16S rRNA for Bacteria, by means of next-generation sequencing (NSG). The results show seven different bacterial phyla (Proteobacteria, Bacteroidetes, Firmicutes, Acidobacteria, Actinobacteria, Spirochaetota and Tenericutes) and 70 bacterial genera (more than 1% significance), of which the most significant ones were Pseudomonas, Sphingobacterium, Devosia, Brucella, Flavisolibacter, Sphingomonas and Nitratireductor. The genus Brucella was found during mesophilic and thermophilic phases, and this genus has not yet been reported an in article involving composting process. With the results obtained, the potential for adaptation of the bacterial community was observed, being under the influence of antibiotics for veterinary use.

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Acknowledgments

The authors would like to thank the Graduate Program in Civil Engineering and the Graduate Program in Chemistry at the Federal University of Santa Maria—UFSM, and the State University of Rio Grande do Sul (UERGS)—Campus Três Passos—RS, for supporting the research.

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This work did not have the help of any funding agency to carry out the research.

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Correspondence to Robson Evaldo Gehlen Bohrer.

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Communicated by Erko Stackebrandt.

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Bohrer, R.E.G., Carissimi, E., Guerra, D. et al. Evaluation of bacterial diversity in a swine manure composting system contaminated with veterinary antibiotics (VAs). Arch Microbiol 205, 85 (2023). https://doi.org/10.1007/s00203-022-03382-y

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  • DOI: https://doi.org/10.1007/s00203-022-03382-y

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