Syngas fermentation to biofuels: Effects of hydrogen partial pressure on hydrogenase efficiency

Skidmore, Bradley E.; Baker, Ryan; Banjade, Dila Ram; Bray, Jason M.; Tree, Douglas R.; Lewis, Randy S.

doi:10.1016/j.biombioe.2013.01.034

Cited by 34 publications

(20 citation statements)

References 19 publications

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“…The concentration of H 2 seems to have a milder influence on the performance of the consortium, although changes in the P H2 have been reported to have an effect on the microbial activity. The activity of the hydrogenase of a clostridial species denoted as P11 was studied under increasing P H2 , finding that higher P H2 enhanced the activity of the hydrogenase . However, the efficiency of the hydrogenase decreased as the pressure of H 2 built up due to the saturation of the enzyme .…”

Section: Progress In Syngas Biomethanation and Ongoing Researchmentioning

confidence: 99%

“…Th e activity of the hydrogenase of a clostridial species denoted as P11 was studied under increasing P H2 , fi nding that higher P H2 enhanced the activity of the hydrogenase. 90 However, the effi ciency of the hydrogenase decreased as the pressure of H 2 built up due to the saturation of the enzyme. 90 Th ese fi ndings are in line with the results of other experiments using a mixed culture approach, in which the production rate of CH 4 increased sensibly from 0.035 mmol/h to 0.072 mmol/h upon an increase of the initial pressure of H 2 / CO 2 from 1 to 5 atm, 91 as it can be noted that the increase in the productivity appears not to correspond proportionally to the increase of pressure.…”

Section: Gas Partial Pressurementioning

confidence: 99%

“…90 However, the effi ciency of the hydrogenase decreased as the pressure of H 2 built up due to the saturation of the enzyme. 90 Th ese fi ndings are in line with the results of other experiments using a mixed culture approach, in which the production rate of CH 4 increased sensibly from 0.035 mmol/h to 0.072 mmol/h upon an increase of the initial pressure of H 2 / CO 2 from 1 to 5 atm, 91 as it can be noted that the increase in the productivity appears not to correspond proportionally to the increase of pressure. Th erefore, it is likely that the hydrogenases of other H 2 -utilizing micro-organisms, for example hydrogenotrophic methanogens, are also aff ected by high P H2 resulting in lower rates of conversion.…”

Section: Gas Partial Pressurementioning

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: Progress In Syngas Biomethanation and Ongoing Researchmentioning

confidence: 99%

Section: Gas Partial Pressurementioning

confidence: 99%

Section: Gas Partial Pressurementioning

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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“…Current methods under development for cellulosic biomass hydrolysis and fermentation essentially fall into four categories: (1) concentrated acid hydrolysis (Figure 19), (2) dilute acid hydrolysis, (3) enzymatic hydrolysis (Figure 20), and (4) thermochemical conversion (gasification and pyrolysis) followed by fermentation of synthesis gases, a process that attempts to circumvent problems associated with hydrolysis (Skidmore et al, 2013). Current methods under development for cellulosic biomass hydrolysis and fermentation essentially fall into four categories: (1) concentrated acid hydrolysis (Figure 19), (2) dilute acid hydrolysis, (3) enzymatic hydrolysis (Figure 20), and (4) thermochemical conversion (gasification and pyrolysis) followed by fermentation of synthesis gases, a process that attempts to circumvent problems associated with hydrolysis (Skidmore et al, 2013).…”

Section: Biochemical Conversionmentioning

confidence: 99%

Global Agriculture: Industrial Feedstocks for Energy and Materials

Jenkins

2014

Encyclopedia of Agriculture and Food Systems

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“…The typical capital cost of corn‐to‐ethanol reactors is $60,000 per barrel‐per‐day capacity . Therefore, bioreactors for GTL are under active research and development …”

Section: Introductionmentioning

confidence: 99%

A micro‐jet array for economic intensification of gas transfer in bioreactors

Turney

Ansari

Kalaga

et al. 2018

Biotechnology Progress

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Bioreactors are of interest for gas‐to‐liquid conversion of stranded or waste industrial gases, such as CO, CH4, or syngas. Process economics requires reduction of bioreactor cost and size while maintaining intense production via rapid delivery of gases to the liquid phase (i.e., high kLa). Here, we show a novel bioreactor design that outperforms all known technology in terms of gas transfer energy efficiency (kLa per power density) while operating at high kLa (i.e., near 0.8 s−1). The reactor design uses a micro‐jet array to break feedstock gas into a downward microbubble flow. Hydrodynamic and surfactant measurements show the reactor's advanced performance arises from its bubble breakage mechanism, which limits fluid shear to a thin plane located at an optimal location for bubble breakage. Power dissipation and kL are shown to scale with micro‐jet diameter rather than reactor diameter, and the micro‐jet array achieves improved performance compared to classical impinging‐jets, ejector, or U‐loop reactors. The hydrodynamic mechanism by which the micro‐jets break bubbles apart is shown to be shearing the bubbles into filaments then fragmentation by surface tension rather than “cutting in half” of bubbles. Guided by these hydrodynamic insights, strategies for industrial design are given. © 2018 American Institute of Chemical Engineers Biotechnol. Prog., 35: e2710, 2019

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Syngas fermentation to biofuels: Effects of hydrogen partial pressure on hydrogenase efficiency

Cited by 34 publications

References 19 publications

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

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

Global Agriculture: Industrial Feedstocks for Energy and Materials

A micro‐jet array for economic intensification of gas transfer in bioreactors

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