Abstract
In this work, the effect of activated carbon particles on the production of xylonic acid from xylose by Gluconobacter oxydans in a stirred tank bioreactor was investigated. The enhancement of the oxygen transfer coefficient by activated carbon particles was experimentally evaluated under different solids volume fractions, agitation and aeration rates conditions. The experimental conditions optimized by response surface methodology (agitation speed 800 rpm, aeration rate 7 L min−1, and activated carbon 0.002%) showed a maximum oxygen transfer coefficient of 520.7 h−1, 40.4% higher than the control runs without activated carbon particles. Under the maximum oxygen transfer coefficient condition, the xylonic acid titer reached 108.2 g/L with a volumetric productivity of 13.53 g L−1 h−1 and a specific productivity of 6.52 g/gx/h. In conclusion, the addition of activated carbon particles effectively enhanced the oxygen mass transfer rate. These results demonstrate that activated carbon particles enhanced cultivation for xylonic acid production an inexpensive and attractive alternative.
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Acknowledgements
This work was funded by the National key research and development program (2021YFC2101602), the National Natural Science Foundation of China (No. 22208160) and the Natural Science Foundation of the Jiangsu Higher Education Institutions of China (No. 21KJB530015).
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CD: Methodology, Software, Validation, Formal analysis, Investigation, Data Curation, Writing-original draft. CX: Conceptualization, Methodology, Software, Validation, Formal analysis, Investigation, Data Curation, Writing-original draft, Writing-review & editing, Visualization, Supervision, Project administration, Funding acquisition. TH: Validation, Investigation, Data Curation. XL: Formal analysis. YZ: Formal analysis. LS: Formal analysis. JO: Resources, Supervision, Project administration. XG: Resources, Supervision, Project administration.
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Ding, C., Xu, C., He, T. et al. Oxygen mass transfer enhancement by activated carbon particles in xylose fermentation media. Bioprocess Biosyst Eng 46, 15–23 (2023). https://doi.org/10.1007/s00449-022-02809-6
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DOI: https://doi.org/10.1007/s00449-022-02809-6