Abstract
Hyperthermophilic microorganisms play a key role in the hyper-thermophilic composting (HTC) technique. However, little information is available about the hyperthermophilic microorganisms prevalent in HTC systems, except for the Calditerricola satsumensis, Calditerricola yamamurae, and Thermaerobacter. To obtain effective hyper-thermophilic microorganisms, a continuous thermo-acclimation of the suitable thermophilic microorganisms was demonstrated in this study. Bacillus thermoamylovorans with high-temperature endurance (70 °C) were newly isolated from sludge composting, and an adequate slow heating rate (2 °C per cycle) was applied to further improve its thermostability. Finally, a strain with a maximum growth temperature of 80 °C was obtained. Moreover, structural and hydrophobic changes in cell proteins, the special amino acid content ratio, and the membrane permeability of the thermophilic bacterium after thermo-acclimation were evaluated for improved thermostability. In addition, the acclimated hyperthermophilic bacterium was further inoculated into the HTC system, and an excellent performance with a maximum operating temperature of 82 °C was observed.
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The authors acknowledge that this work was supported by the National Natural Science Foundation of China (22078194) and National Key Research and Development Program (2017YFE0127100).
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Funding provided by the National Natural Science Foundation of China (22078194) and National Key Research and Development Program (2017YFE0127100).
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ZW: conceptualization, investigation, methodology, experiments and writing (original draft preparation). SW: article revision and supervision. CF: methodology and article revision. XZ: data collection and writing (review and editing). DW: methodology and investigation. XW: formal analysis and investigation. HK: methodology, writing (review and editing), supervision and funding acquisition.
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Wang, Z., Wu, S., Fan, C. et al. Isolation and thermo-acclimation of thermophilic bacteria in hyperthermophilic fermentation system. Bioprocess Biosyst Eng 45, 75–85 (2022). https://doi.org/10.1007/s00449-021-02640-5
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DOI: https://doi.org/10.1007/s00449-021-02640-5