Abstract
In the coal biogasification, butyric acid is an important intermediate product. The enrichment of butyric acid-producing bacteria in coal geological methanogens is critical to confirm this assertion. Therefore, to study a method for enrichment of butyric acid-producing bacteria and to explore characteristic factors for evaluating the enrichment effect would be the basis for further strain isolation and metabolomics research. In this study, the nutrition control method was used for the butyric acid-producing bacteria enrichment from concentrated bacteria solution in Sihe coal seam. The characteristic factors’ changes in gas production, gas composition, butyric acid concentration, and pH were observed and analyzed in the experiment. High-throughput sequencing was used as a verification method to validate the medium and genera enrichment effect that can be used for the butyric acid-producing bacteria. Through experimental research and analysis, it was identified that the glucose-sucrose-maltose medium was the beneficial medium to the enrichment of butyric acid-producing bacteria, and the high-throughput sequencing determined that the enriched genera were Clostridium spp. Glucose-sucrose-maltose medium experimental data confirmed that the decrease of CO2 and H2 daily yield, the increase of butyric acid concentration, and the decrease of pH value had a significant positive correlation with the enrichment of Clostridium spp.



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Acknowledgments
The authors acknowledge the contributions of the following companies for allowing access to coal samples and other information used in this paper: Sihe mining, J&D Technology Company.
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This work was supported by the Independent Research Project of State Key Laboratory of Coal Resources and Safe Mining, CUMT (grant number SKLCRSM19X0012: DX), the Open Research Project of State Key Laboratory of Coal Resources and Safe Mining (grant number SKLCRSM17KFA08: DX), the Fundamental Key Projects of Shanxi Provincial Key Research and Development Program (grant number 201703D211003: YZ), and the Fundamental Research Funds for Central Universities (grant number 2014QNB41: DX).
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Data curation, Xuefang Yuan and Martial Le Prince Essengue Samboukel; funding acquisition, Yidong Zhang and Enyuan Wang; methodology, Hailun He; project administration, Dong Xiao; Writing—original draft—Dong Xiao; Writing—review and editing, Meng Wang.
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Xiao, D., Yuan, X., Wang, M. et al. Selective Enrichment of Clostridium Spp. by Nutrition Control from Sihe Coal Geological Microbial Communities. Appl Biochem Biotechnol 192, 952–964 (2020). https://doi.org/10.1007/s12010-020-03367-x
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DOI: https://doi.org/10.1007/s12010-020-03367-x


