Simultaneous production of hydrogen and ethanol from waste glycerol by Enterobacter aerogenes KKU-S1

Alissara Reungsang, Sureewan Sittijunda, Irini Angelidaki

Research output: Contribution to journalJournal articleResearchpeer-review


Factors affecting simultaneous hydrogen and ethanol production from waste glycerol by a newly isolated bacterium Enterobacter aerogenes KKU-S1 were investigated employing response surface methodology (RSM) with central composite design (CCD). The Plackett-Burman design was first used to screen the factors influencing simultaneous hydrogen and ethanol production, i.e., initial pH, temperature, amount of vitamin solution, yeast extract (YE) concentration and glycerol concentration. Results indicated that initial pH, temperature, YE concentration, and glycerol concentration had a statistically significant effect (p ≤ 0.05) on hydrogen production rate (HPR) and ethanol production. The significant factors were further optimized using CCD. Optimum conditions for simultaneously maximizing HPR and ethanol production were YE concentration of 1.00 g/L, glycerol concentration of 37 g/L, initial pH of 8.14, and temperature of 37 °C in which a maximum HPR and ethanol production of 0.24 mmol H2/L h and 120 mmol/L were achieved.
Original languageEnglish
JournalInternational Journal of Hydrogen Energy
Issue number4
Pages (from-to)1813-1825
Publication statusPublished - 2013


  • Simultaneous
  • Biohydrogen
  • Ethanol
  • Enterobacter aerogenes KKU-S1
  • Waste glycerol
  • Optimization

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