Abstract
Anaerobic succinate fermentations can achieve high-titer, high-yield performance while fixing CO2 through the reductive branch of the tricarboxylic acid cycle. To provide the needed CO2, conventional media is supplemented with significant (up to 60 g/L) bicarbonate (HCO3−), and/or carbonate (CO32−) salts. However, producing these salts from CO2 and natural ores is thermodynamically unfavorable and, thus, energetically costly, which reduces the overall sustainability of the process. Here, a series of composite hollow fiber membranes (HFMs) were first fabricated, after which comprehensive CO2 mass transfer measurements were performed under cell-free conditions using a novel, constant-pH method. Lumen pressure and total HFM surface area were found to be linearly correlated with the flux and volumetric rate of CO2 delivery, respectively. Novel HFM bioreactors were then constructed and used to comprehensively investigate the effects of modulating the CO2 delivery rate on succinate fermentations by engineered Escherichia coli. Through appropriate tuning of the design and operating conditions, it was ultimately possible to produce up to 64.5 g/L succinate at a glucose yield of 0.68 g/g; performance approaching that of control fermentations with directly added HCO3−/CO32− salts and on par with prior studies. HFMs were further found to demonstrate a high potential for repeated reuse. Overall, HFM-based CO2 delivery represents a viable alternative to the addition of HCO3−/CO32− salts to succinate fermentations, and likely other ‘dark’ CO2-fixing fermentations.
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Acknowledgements
This work was supported in part by a grant from the National Science Foundation (CBET- 2148629). IW was supported by a Presidential Graduate Fellowship from Arizona State University. Data analysis was conducted with GraphPad Prism 10. Figures were made using Biorender.com and GraphPad Prism 10.
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AG, BER, XW, and DN conceived and designed the research. YL and BER advised on membrane design and bioreactor implementation. AG and IW collected CO2 delivery data and AG analyzed the data with the guidance of DN. AG, TC, and DC conducted all cell culture experiments and interpreted/analyzed data with the support of XW and DN. DR prepared and ran SEM samples with the support of KS. AG, BER, XW, and DN wrote the manuscript. All authors read, edited, and approved the manuscript.
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Godar, A.G., Chase, T., Conway, D. et al. ‘Dark’ CO2 fixation in succinate fermentations enabled by direct CO2 delivery via hollow fiber membrane carbonation. Bioprocess Biosyst Eng 47, 223–233 (2024). https://doi.org/10.1007/s00449-023-02957-3
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DOI: https://doi.org/10.1007/s00449-023-02957-3