Abstract
The present study aims to investigate microbial community structures household biogas digesters with different raw materials in Qinghai Plateau rural. High-throughput 16S rRNA gene sequencing analysis revealed that Firmicutes, Bacteroidetes, and Proteobacteria are the most abundant bacterial phyla (64.08%). Prevotella group 7 was the most abundant genus in digester YL9 and YL10 (69.72% and 26.96%, respectively) using vegetable waste raw materials. Trichococcus exhibited the highest abundance (14.55%) in YL1 digester using sheep and pig manure. Clostridium sensu stricto 1 (13.89%) and Synergistaceae_uncultured (15.52%) comprised the highest abundances in digester YL5 with mixed raw materials (i.e., dairy manure, sheep manure, and human feces). In addition, Proteiniphilum and Pseudomonas exhibited the highest abundances among bacterial genera in YL4 digester using pig manure. Methanomicrobiales was the most dominant archaeal communities, ranging from 13.35% to 81.34% in abundance. Methanocorpusculum exhibited dominant abundances in all digesters using various raw materials. Methanogenium was the most abundant archaeal genera in YL4 and YL6 digesters, which consume pig manure as primary raw material. In addition, Methanosarcina and Methanosaeta exhibited the highest abundances in digester YL1 (55.03%) and YL9 (51.40%), respectively. Moreover, fermentation temperatures and pH both contributed to the archaeal and bacterial community structures in all the investigated digesters. Specially, fermentation temperature showed positive correlation with the abundances of Synergistaceae_uncultured, Methanogenium, and Methanosaeta, and pH was positively correlated with the abundances of Prevotella group 7 and Methanosarcina abundances.
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Acknowledgements
We gratefully acknowledge financial support from the Applied Basic Research Program of Qinghai Province (2019-ZJ-7052), the Qinghai Province Technology Commercialization Project (2019-NK-116), and the Key Laboratory Project of Qinghai Science & Technology Department (2020-ZJ-Y02). We also thank LetPub (www.letpub.com) for its linguistic assistance and scientific consultation during the preparation of this manuscript.
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Han, R., Liu, L., Meng, Y. et al. Archaeal and bacterial community structures of rural household biogas digesters with different raw materials in Qinghai Plateau. Biotechnol Lett 43, 1337–1348 (2021). https://doi.org/10.1007/s10529-021-03105-1
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DOI: https://doi.org/10.1007/s10529-021-03105-1