Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
679185 | Bioresource Technology | 2016 | 10 Pages |
Abstract
An efficient syngas fermentation bioreactor provides a mass transfer capability that matches the intrinsic kinetics of the microorganism to obtain high gas conversion efficiency and productivity. In this study, mass transfer and gas utilization efficiencies of a trickle bed reactor during syngas fermentation by Clostridium ragsdalei were evaluated at various gas and liquid flow rates. Fermentations were performed using a syngas mixture of 38% CO, 28.5% CO2, 28.5% H2 and 5% N2, by volume. Results showed that increasing the gas flow rate from 2.3 to 4.6Â sccm increased the CO uptake rate by 76% and decreased the H2 uptake rate by 51% up to Run R6. Biofilm formation after R6 increased cells activity with over threefold increase in H2 uptake rate. At 1662Â h, the final ethanol and acetic acid concentrations were 5.7 and 12.3Â g/L, respectively, at 200Â ml/min of liquid flow rate and 4.6Â sccm gas flow rate.
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Authors
Mamatha Devarapalli, Hasan K. Atiyeh, John R. Phillips, Randy S. Lewis, Raymond L. Huhnke,