Abstract
Significant quantities of antibiotics are used in modern livestock husbandry and are found in livestock waste. Such waste has been reported to exert inhibitory effects if used as a substrate in biogas facilities. The goal of this study is to analyze the inhibitory effect of the antibiotics chlortetracycline (CTC) and enrofloxacin (EFX) on biogas production with pig slurry. Antibiotic concentrations up to 8,000 mg kg−1 dry matter (DM) pig slurry were added in continuous fermentation tests. Impacts on methane production and on the microbial community structure were analyzed. The results clearly show that chlortetracycline and enrofloxacin negatively affect biogas production. Higher concentrations of antibiotics led to lower methane production. The addition of 200 mg kg−1 DM of CTC or EFX reduced the specific methane yields up to 49 and 44 %, respectively. The microbial community did not show any changes at this concentration. When chlortetracycline was added at a concentration of 8,000 mg kg−1 DM, the biodiversity changed slightly compared to the control without antibiotics.
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Acknowledgments
The authors would like to thank Dr. M. Casler for his valuable suggestions to improve the quality of the paper. This project was financed by the Federal Ministry of Agriculture, Forestry, Environment and Water Management (BMLFUW) and the nine Austrian provinces and Austrian Research Promotion Agency (FFG), who promote this project. E. N. and I. B. gratefully acknowledge the grant provided by the German Federal Ministry of Food and Agriculture (grant no. FNR 22011804).
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ESM 1
Distribution of operational taxonomic units (OTUs) as represented by individual ARDRA fingerprint patterns and the contributing clone numbers as detected in the two 16S rRNA gene libraries constructed out of samples derived from fermentations with and without addition of 8,000 mg kg−1 DM enrofloxacin (EFX). The taxonomic classification was according to Bergey’s Manual and NCBI taxonomy. ND = not detected. (PDF 34 kb)
ESM 2
Phylogenetic tree of the operational taxonomic units (OTUs) among the phylum Euryarchaeota of the domain Archaea as determined in clone libraries constructed from PCR-amplified sequences of microbial 16S rRNA genes out of microbial gDNA purified from samples with and without enrofloxacin (8,000 mg kg−1 DM; experiment 1, variant 11). Numbers in round brackets indicate contributing clone numbers in the respective clone library (with/without enrofloxacin; further details as given in Tab. S1). The tree based on neighbor-joining analysis of 616 nucleotide positions. The evolutionary distances were computed using the Jukes-Cantor method and are in the units of the number of base substitutions per site. Numbers at nodes represent bootstrap values for the nodes in percent (1,000 times resampling analysis). Only bootstrap values above 50 % were displayed. Numbers in brackets indicate the NCBI genbank accession number of 16S rRNA gene sequences of reference strains. Halobacterium salinarium was used as the outgroup (marked by an asterisk). For phylogenetic analysis and tree construction the software MEGA5 developed by Tamura et al. (2011) was used. All further details as described in Klocke et al. [25]. (PDF 70 kb)
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Bauer, A., Lizasoain, J., Nettmann, E. et al. Effects of the Antibiotics Chlortetracycline and Enrofloxacin on the Anaerobic Digestion in Continuous Experiments. Bioenerg. Res. 7, 1244–1252 (2014). https://doi.org/10.1007/s12155-014-9458-0
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DOI: https://doi.org/10.1007/s12155-014-9458-0