Ale Enriquez Fuad, Ahring Birgitte K
Bioproducts, Sciences, and Engineering Laboratory, Washington State University, Tri-Cities, Richland, WA 99354, USA; The Gene and Linda Voiland School of Chemical and Bioengineering, Washington State University, Pullman, WA 99164, USA.
Bioproducts, Sciences, and Engineering Laboratory, Washington State University, Tri-Cities, Richland, WA 99354, USA; The Gene and Linda Voiland School of Chemical and Bioengineering, Washington State University, Pullman, WA 99164, USA; Biological Systems Engineering Department, L.J. Smith Hall, Washington State University, Pullman, WA 99164, USA.
Bioresour Technol. 2023 Jun;377:128948. doi: 10.1016/j.biortech.2023.128948. Epub 2023 Mar 22.
Fermentation of gaseous substrates such as carbon dioxide (CO) has emerged as a sustainable approach for transforming greenhouse gas emissions into renewable fuels and biochemicals. CO fermentations are catalyzed by hydrogenotrophic methanogens and homoacetogens, these anaerobic microorganisms selectively reduce CO using hydrogen (H) as electron donor. However, H possesses low solubility in liquid media leading to slow mass transport, limiting the reaction rates of CO reduction. Solving the problems of mass transport of H could boost the advance of technologies for valorizing industrial CO-rich streams, like biogas or syngas. The application could further be extended to combustion flue gases or even atmospheric CO. In this work, an overview of strategies for overcoming H mass transport limitations during methanogenic and acetogenic fermentation of H and CO is presented. The potential for using these strategies in future full-scale facilities and the knowledge gaps for these applications are discussed in detail.
将二氧化碳（CO）等气态底物发酵已成为一种可持续的方法，可将温室气体排放转化为可再生燃料和生物化学品。CO发酵由氢营养型产甲烷菌和同型产乙酸菌催化，这些厌氧微生物以氢气（H）作为电子供体选择性地还原CO。然而，H在液体介质中的溶解度较低，导致传质缓慢，限制了CO还原的反应速率。解决H的传质问题可以推动将富含CO的工业气流（如沼气或合成气）转化为有价值产品的技术进步。该应用还可以进一步扩展到燃烧烟道气甚至大气中的CO。在这项工作中，概述了在H和CO的产甲烷和产乙酸发酵过程中克服H传质限制的策略。详细讨论了在未来全规模设施中使用这些策略的潜力以及这些应用的知识空白。
