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Development of dissolved carbon dioxide‐driven‐and‐controlled repeated batch fermentation process for ethanol production
Author(s) -
Feng Sijing,
Lin YenHan
Publication year - 2020
Publication title -
the canadian journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.404
H-Index - 67
eISSN - 1939-019X
pISSN - 0008-4034
DOI - 10.1002/cjce.23822
Subject(s) - fermentation , chemistry , industrial fermentation , carbon dioxide , ethanol , ethanol fuel , yield (engineering) , pulp and paper industry , food science , chromatography , biochemistry , organic chemistry , materials science , engineering , metallurgy
We previously observed that as glucose is completely exhausted during ethanol fermentation, the dissolved carbon dioxide (DCO 2 ) level in the fermenter will suddenly decline. This observation was implemented to design and develop a DCO 2 ‐driven‐and‐controlled repeated batch fermentation process for ethanol production. The process was tested at four different glucose concentrations (~150 g/L, ~200 g/L, ~250 g/L, and ~300 g/L), and each glucose concentration was controlled under three respective DCO 2 control levels (without DCO 2 control, and DCO 2 controlled at either 1000 mg/L or 750 mg/L). The results show that reported process features complete glucose utilization and is self‐driven. For glucose concentration less than 200 g/L, ~41%‐50% of fermentation time per batch was saved during the repeated batch operation. It took 12.1 ± 1.1 hours‐14.9 ± 1.9 hours to complete a batch with glucose feed at ~250 g/L and 21.7 ± 6 hours‐31.5 ± 7 hours to complete a batch with glucose feed at ~300 g/L. The reported process is time saving and stable, but the ethanol yield is ~20% lower than the operation without DCO 2 control. Dissolved CO 2 control became essential for glucose concentrations greater than 250 g/L if zero glucose discharge in each batch during the operation is desired.