Evaluation of bioenergy recovery processes treating organic residues from ethanol fermentation process

Chun Po Juang, Liang Ming Whang, Hai Hsuan Cheng

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37 Citations (Scopus)


This study evaluates a two-stage bioprocess for recovering bioenergy in the forms of hydrogen and methane while treating organic residues of ethanol fermentation from tapioca starch. A maximum hydrogen production rate of 0.77mmolH2/gVSS/h can be achieved at volumetric loading rate (VLR) of 56kgCOD/m3/day. Batch results indicate that controlling conditions at S0/X0=12 with X0=4000mgVSS/L and pH 5.5-6 are important for efficient hydrogen production from fermentation residues. Hydrogen-producing bacteria enriched in the hydrogen bioreactor are likely utilizing lactate and acetate for biohydrogen production from ethanol-fermentation residues. Organic residues remained in the effluent of hydrogen bioreactor can be effectively converted to methane with a rate of 0.37mmol CH4/gVSS/h at VLR of 8kg COD/m3/day. Approximately 90% of COD in ethanol-fermentation residues can be removed and among that 2% and 85.1% of COD can be recovered in the forms of hydrogen and methane, respectively.

Original languageEnglish
Pages (from-to)5394-5399
Number of pages6
JournalBioresource technology
Issue number9
Publication statusPublished - 2011 May

All Science Journal Classification (ASJC) codes

  • Bioengineering
  • Environmental Engineering
  • Renewable Energy, Sustainability and the Environment
  • Waste Management and Disposal


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