Abstract
This study evaluated the performance of an upflow anaerobic filter (UAF) reactor in the thermophilic methane fermentation of hypersaline molasses wastewater. The high salinity (~ 45 mS/cm) of the undiluted wastewater completely inhibited the biogas production. An acclimation strategy involving gradient dilution of the molasses wastewater was implemented to gradually increase the salt stress. Consequently, the biogas production was recovered, inhibited only slightly by the high salinity of the undiluted wastewater. The reactor steadily achieved a high total organic carbon (TOC) loading rate of 5 g/L/day, with approximately 60% TOC removal efficiency. Acclimation to the gradually increased salt stress leads to a relative abundance of some halotolerant microbes, such as bacteria from Arcobacter, Tissierella, and Ruminococcaceae, which increased as their hydrolytic and acidogenic abilities adjusted to the incremental increase in salinity. Additionally, hydrogenotrophic methanogens, especially Methanoculleus, showed greater resistance to hypersalinity than aceticlastic methanogens. These results suggest that acclimation of the fermentation microbial community to hypersalinity is an effective strategy to improve methane production from hypersaline molasses wastewater in thermophilic UAF reactors.
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Acknowledgments
This work was supported by the Key Program for International S&T Cooperation Projects of China (2016YFE0127700), the National Science Foundation of China (51808361, 41701295), the China Postdoctoral Science Foundation (2018 M643480, 2018M640936), and Sichuan Science and Technology Program (2018JY0536).
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Yu N., Tan L., Sun Z.Y., Tang Y.Q., Kida K. Production of bio-ethanol by integrating microwave-assisted dilute sulfuric acid pretreated sugarcane bagasse slurry with molasses. Applied Biochemistry and Biotechnology, 2018, 185(1), 191–206.
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Chen, YT., Yu, N., Sun, ZY. et al. Acclimation Improves Methane Production from Molasses Wastewater with High Salinity in an Upflow Anaerobic Filter Reactor: Performance and Microbial Community Dynamics. Appl Biochem Biotechnol 191, 397–411 (2020). https://doi.org/10.1007/s12010-020-03236-7
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DOI: https://doi.org/10.1007/s12010-020-03236-7