Mass-transfer and kinetic aspects in continuous bioreactors usingRhodospirillum rubrum

Cowger, J. P.; Klasson, K. Thomas; Ackerson, M.D.; Clausen, Edgar C.; Caddy, J. L.

doi:10.1007/bf02920582

Cited by 46 publications

(29 citation statements)

References 7 publications

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“…The cell culture density is limiting the CO conversion rate only when the cell concentration is low just after inoculation (Henstra 2006). However, because of the low aqueous solubility of CO, gasliquid mass transfer turns out to be the limiting step of CO conversion once the growth of biomass has been sufficient, as the volumetric bioactivity potential of the C. hydrogenoformans culture becomes limited by the dissolved CO available in the liquid (Cowger et al 1992;Kapic et al 2006;Riggs and Heindel 2006;J o n e s2007; Ungerman and Heindel 2007). Hence, for a thermophilic bioprocess to perform at a continuous maximal volumetric activity rate, it is essential for the cell concentration of the microorganism to be optimized to avoid the CO gas-liquid mass transfer limitation.…”

Section: Introductionmentioning

confidence: 99%

Kinetics of CO conversion into H2 by Carboxydothermus hydrogenoformans

Zhao

Cimpoia

Liu

et al. 2011

Appl Microbiol Biotechnol

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The objective of this study was to improve the biological water-gas shift reaction for producing hydrogen (H 2 ) by conversion of carbon monoxide (CO) using an anaerobic thermophilic pure strain, Carboxydothermus hydrogenoformans. Specific hydrogen production rates and yields were investigated at initial biomass d e n s i t i e sv a r y i n gf r o m5t o2 0m gv o l a t i l es u s p e n d e d solid (VSS) L −1 . Results showed that the gas-liquid mass transfer limits the CO conversion rate at high biomass concentrations. At 100-rpm agitation and at CO partial pressure of 1 atm, the optimal substrate/biomass ratio must exceed 5 mol CO g −1 biomass VSS in order to avoid gasliquid substrate transfer limitation. An average H 2 yield of 94±3% and a specific hydrogen production rate of ca. 3m o lg −1 VSS day −1 were obtained at initial biomass d e n s i t i e sb e t w e e n5a n d8m gV S S −1 . In addition, CO bioconversion kinetics was assessed at CO partial pressure from 0.16 to 2 atm, corresponding to a dissolved CO concentration at 70°C from 0.09 to 1.1 mM. Specific bioactivity was maximal at 3.5 mol CO g −1 VSS day −1 for a dissolved CO concentration of 0.55 mM in the culture. This optimal concentration is higher than with most other hydrogenogenic carboxydotrophic species.

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Section: Introductionmentioning

confidence: 99%

Kinetics of CO conversion into H2 by Carboxydothermus hydrogenoformans

Zhao

Cimpoia

Liu

et al. 2011

Appl Microbiol Biotechnol

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“…Mass transfer characteristics of various reactor configurations have compared by many researchers (Bredwell and Worden, 1998;Cowger et al, 1992;Jones, 2007;Klasson et al, 1990b;Klasson et al, 1991;Klasson et al, 1993a;Munasinghe and Khanal, 2010b;Munasinghe and Khanal, 2014;Orgill et al, 2013;Riggs and Heindel, 2006;Shen et al, 2014a;Yasin et al, 2014). In a STR, the mass transfer coefficient can be increased by increasing 268-280.…”

Section: Bioreactor Designmentioning

confidence: 99%

A review of conversion processes for bioethanol production with a focus on syngas fermentation

Devarapalli¹,

Atiyeh²

2015

Biofuel Res. J.

134

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“…Based on work reported in Spath et al [22], the gas reformer was modeled as a fluidized bed reactor of the same size as the gasifier, with the same specifications except for bed material. Instead of crushed limestone, the catalyst described by Spath et al was used for cost estimation purposes [15]. The reactions taking place in the gas reformer require heat, and this was modeled as coming from a stream of syngas split off from the main stream before the gas reformer.…”

Section: Gas and Tar Reformingmentioning

confidence: 99%

“…Techno-economic analysis of PHA production by the gasification-based biorefinery will allow for the estimation of PHA production cost on a commercial scale and for the evaluation of the economic feasibility of PHA production. In this study, the biorefinery process was simulated based on the recently published information on the production and separation of PHA [4,[13][14][15][16][17][18][19][20][21][22].…”

Section: Introductionmentioning

confidence: 99%

A Techno-economic Analysis of Polyhydroxyalkanoate and Hydrogen Production from Syngas Fermentation of Gasified Biomass

Choi

Chipman

Bents

et al. 2009

Appl Biochem Biotechnol

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A techno-economic analysis was conducted to investigate the feasibility of a gasification-based hybrid biorefinery producing both hydrogen gas and polyhydroxyalkanoates (PHA), biodegradable polymer materials that can be an attractive substitute for conventional petrochemical plastics. The biorefinery considered used switchgrass as a feedstock and converted that raw material through thermochemical methods into syngas, a gaseous mixture composed mainly of hydrogen and carbon monoxide. The syngas was then fermented using Rhodospirillum rubrum, a purple non-sulfur bacterium, to produce PHA and to enrich hydrogen in the syngas. Total daily production of the biorefinery was assumed to be 12 Mg of PHA and 50 Mg of hydrogen gas. Grassroots capital for the biorefinery was estimated to be $55 million, with annual operating costs at $6.7 million. With a market value of $2.00/kg assumed for the hydrogen, the cost of producing PHA was determined to be $1.65/kg.

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Mass-transfer and kinetic aspects in continuous bioreactors usingRhodospirillum rubrum

Cited by 46 publications

References 7 publications

Kinetics of CO conversion into H2 by Carboxydothermus hydrogenoformans

Kinetics of CO conversion into H2 by Carboxydothermus hydrogenoformans

A review of conversion processes for bioethanol production with a focus on syngas fermentation

A Techno-economic Analysis of Polyhydroxyalkanoate and Hydrogen Production from Syngas Fermentation of Gasified Biomass

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