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Performance of a Carboxydothermus hydrogenoformans gas lift reactor for syngas upgrading into hydrogen

Par Conseil national de recherches du Canada

AuteurRechercher : 1; Rechercher : 1
Affiliation
  1. Conseil national de recherches du Canada. Énergie, les mines et l'environnement
FormatTexte, Article
ConférenceBioenergy Australia 2013, November 25-26, 2013, Hunter Valley, NSW
Sujetcarboxydothermus hydrogenoformans; carbon monoxide; hydrogen; gas-lift bioreactor; continuous; gas-liquid mass transfer
Résumé
The conversion of carbon monoxide (CO) into hydrogen (H2) by a Carboxydothermus hydrogenoformans pure culture was investigated and optimized in a 35 L gas-lift reactor. The reactor was operated with a continuous supply of gas for 3 months. Reactor performance was evaluated under various operational conditions, such as gas recirculation rates (0.3 and 1.5 L•min-1), CO feeding rates (from 0.05 to 0.46 mol•L-1reactor•day–1) and bacto-peptone addition to the medium. Overall, the H2 yields were constant at 95±1% and 82±1% (molH2•mol–1CO) with growth supported by peptone and unsupported respectively, regardless of the operational conditions tested. At the highest biomass density, a maximum CO conversion activity of 0.17 molCO•L–1reactor•day-1 or 3.79 LCO•L-1reactor•day-1 was achieved. The ratio of gas recirculation over CO feed flow rates (QR:Qin) was the major parameter that impacted both biological activity and volumetric gas-liquid mass transfer. The CO conversion performance of the gas lift reactor was kinetically limited over a QR:Qin ratio of 40, and mass transfer limited below that ratio, resulting in a maximum conversion efficiency of 90.4±0.3% and a biological activity of 2.7±0.4 molCO•g– 1VSS•day–1. Overall, the CO conversion performance in the gas-lift reactor was limited by a low cell density, typical of C. hydrogenoformans planktonic growth. This limitation was found to be the most restrictive factor for higher CO loading rates.
Langueanglais
Publications évaluées par des pairsNon
Numéro du CNRCNRC-EME-55634
EME-MTL-0020
EME-MTL-0023
Numéro NPARC21275981
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Identificateur de l’enregistrementea827aa1-31ce-46ee-ac3a-f1d1b445dd1b
Enregistrement créé2015-08-25
Enregistrement modifié2020-04-22
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