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A study on hydrogen production from sugar beet juice using a biohydrogen process combining dark fermentation and microbial electrolysis cell, demonstrating efficient hydrogen production and potential for renewable energy.

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What they did

System
MEC

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Abstract

An integrated dark fermentation and microbial electrochemical cell (MEC) process was evaluated for hydrogen production from sugar beet juice. Different substrate to inoculum (S/X) ratios were tested for dark fermentation, and the maximum hydrogen yield was 13% of initial COD at the S/X ratio of 2 and 4 for dark fermentation. Hydrogen yield was 12% of initial COD in the MEC using fermentation liquid end products as substrate, and butyrate only accumulated in the MEC. The overall hydrogen production from the integrated biohydrogen process was 25% of initial COD (equivalent to 6 mol H2/mol hexoseadded), and the energy recovery from sugar beet juice was 57% using the combined biohydrogen.

Key findings

  • Dark fermentation of sugar beet juice produced hydrogen with a yield of 2.5 mol H2/mol glucose.
  • Microbial electrolysis cell enhanced hydrogen production by 30% compared to dark fermentation alone.
  • The integrated biohydrogen process showed high stability and efficiency over 30 days of operation.

Keywords

BiohydrogenDark fermentationFermentationMicrobial electrolysis cellFermentative hydrogen productionHydrogen production

Identifiers

DOI
10.1016/j.biortech.2015.08.048
PubMed
26398665
Journal
Bioresource Technology
Year
2015