Abstract
Propionate is a crucial intermediate during methane fermentation. Investigating the effects of different kinds of inhibitors on the propionate-degrading microbial community is necessary to develop countermeasures for improving process stability. In the present study, under inhibitory conditions (acetate, propionate, sulfide, and ammonium addition), the dynamic changes of the propionate-degrading microbial community from a mesophilic chemostat fed with propionate as the sole carbon source were investigated using high-throughput sequencing of 16S rRNA. Sulfide and/or ammonia inhibited specific species in the microbial community. Compared with Syntrophobacter, Smithella was more resistant to inhibition by sulfide and/or ammonia. However, Syntrophobacter demonstrated greater tolerance than Smithella under acid inhibition conditions. Some genera that had close phylogenetic relationships and similar functions showed similar responses to different inhibitors.
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Funding
This work was supported by the Ministry of Science and Technology of China (2016YFE0127700) and the National Natural Science Foundation of China (51678378). This study was partly supported by the Japan Society for the Promotion of Science with Grant-in-Aid for Scientific Research No. 17H05239, 18H01576 and 18H03367.
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Wang, HZ., Yan, YC., Gou, M. et al. Response of Propionate-Degrading Methanogenic Microbial Communities to Inhibitory Conditions. Appl Biochem Biotechnol 189, 233–248 (2019). https://doi.org/10.1007/s12010-019-03005-1
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DOI: https://doi.org/10.1007/s12010-019-03005-1