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Metals addition for enhanced hydrogen, acetic and butyric acids production from cellulosic substrates by Clostridium butyricum
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DOI：10.1016/j.biombioe.2020.105679.png)
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Abstract
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The influence of Fe (Iron), Ni (Nickel) and Se (Selene), important cofactors for hydrogenase (hyd), was evaluated in the bioproduction of H2, volatile organic acids (VOA) and alcohols using Clostridium butyricum as inoculum and 5 g/L of cellulose, glucose or sugarcane bagasse (SCB) in batch reactors at 37 degrees C. Conditions A (25 mu M Fe), B (25 mu M Fe + 1 mu M Ni), C (25 mu M Fe + 1 mu M Ni + 1 mu M Se) and D (with no metal addition) using cellulose and glucose were performed to optimize the culture medium. H2 production was favored in condition A being around 16 mmol/L and 6 mmol/L for glucose and cellulose, respectively. The predominance of butyric acid was observed in all experimental series with cellulose and glucose. On the other hand, acetic acid was predominant in the SCB assay. The presence of other bacteria in SCB may have contributed to the change in the route of the final metabolites. The results suggested the possibility of improving H2 and OA production by C. butyricum supplementing the medium with Fe using SCB as substrate source.
Keywords:
Batch reactors
Biofuel production
Cellulose
Enzymes
Sugarcane bagasse
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