Exploiting the potential of gas fermentation

Redl, Stephanie Maria Anna; Diender, Martijn; Jensen, Troy; Sousa, D. Z.; Nielsen, Alex Toftgaard

doi:10.1016/j.indcrop.2016.11.015

Cited by 33 publications

(21 citation statements)

References 78 publications

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“…The thermochemical conversion of the feedstock through gasification constitutes one of the main advantages since any type of biomass can be gasified including agricultural residues, forestry residues, non‐fermentable byproducts from biorefineries, byproducts of any bioprocessing facility, and even organic municipal wastes . However, the substrate of the syngas biomethanation process is not limited to biomass‐derived syngas, as there are other potential sources of CO‐rich industrial off‐gases in the iron and steel sector . Alternatively, other industrial CO 2 ‐rich off‐gases could also be used as substrate along with H 2 derived from the surplus of renewable electricity, opening another potential application as a means of storing renewable electricity .…”

Section: Overview Of the Syngas Biomethanation Processmentioning

confidence: 99%

“…24 However, the substrate of the syngas biomethanation process is not limited to biomassderived syngas, as there are other potential sources of CO-rich industrial off -gases in the iron and steel sector. 25 Alternatively, other industrial CO 2 -rich off -gases could also be used as substrate along with H 2 derived from the surplus of renewable electricity, opening another potential application as a means of storing renewable electricity. 26 Th erefore, there is a rather wide range of industrial off -gas sources and biomasses that could be used as feedstock for this process.…”

Section: Fuelmentioning

confidence: 99%

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Syngas biomethanation: state‐of‐the‐art review and perspectives

Grimalt‐Alemany

Skiadas

Gavala

2017

Biofuels Bioprod Bioref

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Signifi cant research efforts are currently being made worldwide to develop more effi cient biomethane production processes from a variety of waste streams. The biomethanation of biomassderived syngas can contribute to increasing the potential of methane production as it opens the way for the conversion of recalcitrant biomasses, generally not fully exploitable by anaerobic digestion systems. Additionally, this biological process presents several advantages over its analogous process of catalytic methanation such as the use of inexpensive biocatalysts, milder operational conditions, higher tolerance to the impurities of syngas, and higher product selectivity. However, there are still several challenges to be addressed for this technology to reach commercial stage. This work reviews the progress made over the last few years in syngas biomethanation processes in order to provide an overview of the current state of the art of this technology. The most relevant aspects determining the performance of syngas biomethanation processes are extensively discussed here, including microbial diversity and metabolic interactions in mixed microbial consortia, the infl uence of operating parameters and bioreactor designs, and the potential of modelling as a tool for the design and control of this bioprocess.

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Section: Overview Of the Syngas Biomethanation Processmentioning

confidence: 99%

Section: Fuelmentioning

confidence: 99%

Syngas biomethanation: state‐of‐the‐art review and perspectives

Grimalt‐Alemany

Skiadas

Gavala

2017

Biofuels Bioprod Bioref

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“…Increasing acetogenic carbon capture as CO 2 would build on the success of commercial gas fermentation and continue the expansion of the technology as a platform for sustainable chemical production (Redl et al, 2017;Bengelsdorf et al, 2018;Müller, 2019). Compared to other CO 2 valorization methods, acetogens are ideal candidates due to their high metabolic efficiency, ability to handle variable gas compositions, high product specificity, scalability, and low susceptibility to poisoning by sulfur, chlorine, and tars (Liew et al, 2016;Artz et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

Enhancing CO2-Valorization Using Clostridium autoethanogenum for Sustainable Fuel and Chemicals Production

Heffernan

Valgepea

Lemgruber

et al. 2020

Front. Bioeng. Biotechnol.

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Acetogenic bacteria can convert waste gases into fuels and chemicals. Design of bioprocesses for waste carbon valorization requires quantification of steady-state carbon flows. Here, steady-state quantification of autotrophic chemostats containing Clostridium autoethanogenum grown on CO 2 and H 2 revealed that captured carbon (460 ± 80 mmol/gDCW/day) had a significant distribution to ethanol (54 ± 3 C-mol% with a 2.4 ± 0.3 g/L titer). We were impressed with this initial result, but also observed limitations to biomass concentration and growth rate. Metabolic modeling predicted culture performance and indicated significant metabolic adjustments when compared to fermentation with CO as the carbon source. Moreover, modeling highlighted flux to pyruvate, and subsequently reduced ferredoxin, as a target for improving CO 2 and H 2 fermentation. Supplementation with a small amount of CO enabled co-utilization with CO 2 , and enhanced CO 2 fermentation performance significantly, while maintaining an industrially relevant product profile. Additionally, the highest specific flux through the Wood-Ljungdahl pathway was observed during co-utilization of CO 2 and CO. Furthermore, the addition of CO led to superior CO 2-valorizing characteristics (9.7 ± 0.4 g/L ethanol with a 66 ± 2 C-mol% distribution, and 540 ± 20 mmol CO 2 /gDCW/day). Similar industrial processes are commercial or currently being scaled up, indicating CO-supplemented CO 2 and H 2 fermentation has high potential for sustainable fuel and chemical production. This work also provides a reference dataset to advance our understanding of CO 2 gas fermentation, which can contribute to mitigating climate change.

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“…While in the carbonyl branch, CO 2 is reduced to CO consuming two electrons. The CO and the methyl group formed in this first step of WL pathway are converted into 1 mol of acetyl-CoA [33][34][35]. Thereby, the glycolysis and WL are complementary pathways as CO 2 and electrons produced in the glycolysis are fully utilized by WL to produce one additional mol of acetyl-CoA increasing its yield by 50% in relation to glucose metabolism.…”

Section: Discussionmentioning

confidence: 99%

Experimental Design to Improve Cell Growth and Ethanol Production in Syngas Fermentation by Clostridium carboxidivorans

et al. 2020

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Fermentation of gases from biomass gasification, named syngas, is an important alternative process to obtain biofuels. Sequential experimental designs were used to increase cell growth and ethanol production during syngas fermentation by Clostridium carboxidivorans. Based on ATCC (American Type Culture Collection) 2713 medium composition, it was possible to propose a best medium composition for cell growth, herein called TYA (Tryptone-Yeast extract-Arginine) medium and another one for ethanol production herein called TPYGarg (Tryptone-Peptone-Yeast extract-Glucose-Arginine) medium. In comparison to ATCC® 2713 medium, TYA increased cell growth by 77%, reducing 47% in cost and TPYGarg increased ethanol production more than four-times, and the cost was reduced by 31%. In 72 h of syngas fermentation in TPYGarg medium, 1.75-g/L of cells, 2.28 g/L of ethanol, and 0.74 g/L of butanol were achieved, increasing productivity for syngas fermentation.

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Exploiting the potential of gas fermentation

Cited by 33 publications

References 78 publications

Syngas biomethanation: state‐of‐the‐art review and perspectives

Syngas biomethanation: state‐of‐the‐art review and perspectives

Enhancing CO2-Valorization Using Clostridium autoethanogenum for Sustainable Fuel and Chemicals Production

Experimental Design to Improve Cell Growth and Ethanol Production in Syngas Fermentation by Clostridium carboxidivorans

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