Journal
FERMENTATION-BASEL
Volume 7, Issue 3, Pages -Publisher
MDPI
DOI: 10.3390/fermentation7030199
Keywords
synthesis gas fermentation; volumetric mass transfer coefficient; Tween 80 (R) surfactant
Funding
- Fundacao Carlos Chagas Filho de Amparo a Pesquisa do Estado do Rio de Janeiro [FAPERJ-E-26/010.002984/2014]
- Conselho Nacional de Desenvolvimento Cientifico e Tecnologico [CNPq-PQ/2 308626/2019-2]
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Adding Tween(R)80 in the culture medium can significantly increase ethanol and biomass production in syngas fermentation, offering a promising approach to enhance gas-liquid mass transfer and improve biofuel productivity.
Recycling residual industrial gases and residual biomass as substrates to biofuel production by fermentation is an important alternative to reduce organic wastes and greenhouse gases emission. Clostridium carboxidivorans can metabolize gaseous substrates as CO and CO2 to produce ethanol and higher alcohols through the Wood-Ljungdahl pathway. However, the syngas fermentation is limited by low mass transfer rates. In this work, a syngas fermentation was carried out in serum glass bottles adding different concentrations of Tween (R) 80 in ATCC (R) 2713 culture medium to improve gas-liquid mass transfer. We observed a 200% increase in ethanol production by adding 0.15% (v/v) of the surfactant in the culture medium and a 15% increase in biomass production by adding 0.3% (v/v) of the surfactant in the culture medium. The process was reproduced in stirred tank bioreactor with continuous syngas low flow, and a maximum ethanol productivity of 0.050 g/L.h was achieved.
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