Search

Climate change and its consequences have stimulated the development of new bioprocesses to reduce CO 2 concentrations. One approach to address this problem is to recycle CO 2 directly into biofuels or chemicals using chemolithotrophic bacteria. The objective of this study was to evaluate the hydrogen and alcohols production capacity of a chemolithotrophic bacteria Serratia sp. (MZ413438) using NaHCO 3 as the sole carbon source in concentrations of 0, 5, 15, 30, 45 and 60 g L−1. The experimental results showed that the maximum cumulative hydrogen production of 205.00 ± 3.53 mL L−1 was obtained for the treatments at concentrations of 45 g L−1 of NaHCO 3. Furthermore, the experimental data on hydrogen production at different NaHCO 3 concentrations were fitted to the kinetic Gompertz model. The main alcohols found in the different treatments with NaHCO 3 were: ethanol, 1-butanol, 1-propanol, 2-methyl-1-propanol, and 3-methyl-1-butanol. The highest abundance and maximum concentration of alcohols were obtained for the treatments at concentrations of 60 g L−1 of NaHCO 3. This study demonstrates the metabolic potential of Serratia sp. (MZ413438) due to its very short times of bicarbonate fixation (8 h) and bioconversion to value-added products such as hydrogen and alcohols, which increases the knowledge of a diverse group of microorganisms with these capacities, including bacteria and archaea. [Display omitted] • Hydrogen and alcohols production capacity of a chemolithotrophic bacteria. • Different NaHCO 3 concentrations as carbon source for Serratia sp. were evaluated. • The Metabolism of inorganic carbon to alcohols by Serratia sp. is discussed. • The HCO 3 - showed be a promising carbon source to produce biofuels by Serratia sp. [ABSTRACT FROM AUTHOR]