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

Par Conseil national de recherches du Canada

Auteur	Rechercher : Haddad, M.¹; Rechercher : Guiot, S. R.¹
Affiliation	Conseil national de recherches du Canada. Énergie, les mines et l'environnement
Format	Texte, Article
Conférence	Bioenergy Australia 2013, November 25-26, 2013, Hunter Valley, NSW
Sujet	carboxydothermus 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.
Langue	anglais
Publications évaluées par des pairs	Non
Numéro du CNRC	NRC-EME-55634 EME-MTL-0020 EME-MTL-0023
Numéro NPARC	21275981
Exporter la notice	Exporter en format RIS
Signaler une correction	Signaler une correction (s'ouvre dans un nouvel onglet)
Identificateur de l’enregistrement	ea827aa1-31ce-46ee-ac3a-f1d1b445dd1b
Enregistrement créé	2015-08-25
Enregistrement modifié	2020-04-22

Date de modification :: 2024-04-20