Hydrogen fermentation of different galactose-glucose compositions during various hydraulic retention times (HRTs)

Gopalakrishnan Kumar, Jong Hun Park, Mi Sun Kim, Dong Hoon Kim, Sang Hyoun Kim

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Abstract

This study investigated the effects of sugar composition and hydraulic retention time (HRT) on continuous hydrogen fermentation. Continuously-stirred tank reactors (CSTRs) were inoculated with heat-treated digester sludge and fed with 15 g/L of glucose, galactose and galactose: glucose mixture (8:2 ratio-simulating the hydrolysate composition of macroalgae) at HRTs of 6-24 h. Peak hydrogen production rate (HPR) and hydrogen yield (HY) of 4.49 L/L/d and 1.62 mol/mol glucoseadded were attained while using glucose as feedstock at HRTs of 6 and 18 h, respectively. Meanwhile, galactose provided a peak HPR and HY of 2.35 L/L/d and 1.00 mol/mol galactoseadded during the HRTs of 12 and 24 h, respectively. In case of mixed sugars (galactose 8: glucose 2) the production performances were inferior to the sole sugar conditions due to the low substrate utilization of less than 65%, which showed a maximal HPR and HY of 2.75 L/L/d and 0.48 mol/mol carbohydrateadded at the HRTs of 6 and 18 h, respectively.

Original languageEnglish
Pages (from-to)20625-20631
Number of pages7
JournalInternational Journal of Hydrogen Energy
Volume39
Issue number35
DOIs
Publication statusPublished - 2014 Dec 3

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All Science Journal Classification (ASJC) codes

  • Renewable Energy, Sustainability and the Environment
  • Fuel Technology
  • Condensed Matter Physics
  • Energy Engineering and Power Technology

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