Microbial responses to various process disturbances in a continuous hydrogen reactor fed with galactose

Gopalakrishnan Kumar, Jeong Hoon Park, Periyasamy Sivagurunathan, Sang Hoon Lee, Hee-Deung Park, Sang Hyoun Kim

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8 Citations (Scopus)


In this study, microbial responses of a continuous hydrogen reactor fed with galactose have been investigated. Process disturbances reduced H2 production performance as well as large fluctuations in microbial diversity. The peak values of the hydrogen yield (HY) was not influenced greatly during the steady state period, and accounted as 2.01 ± 0.05 and 2.14 ± 0.03 mol/mol galactoseadded, while hydraulic retention time (HRT) was at 12 and 8 h, respectively. Microbial community analysis via 454 pyrosequencing revealed that functional redundancy following changes in the microbial community distribution led to the stability of the fermentation performance. The butyrate to acetate (B/A) ratio well correlated with changes in the microbial community. The energy generation rate and energy yield resulted in the peak values of 134 kJ/L-d and 612 kJ/moladded.

Original languageEnglish
JournalJournal of Bioscience and Bioengineering
Publication statusAccepted/In press - 2016 Mar 10



  • 454 Pyrosequencing
  • Biohydrogen
  • Energy generation rate
  • Functional redundancy
  • Microbial consortia

ASJC Scopus subject areas

  • Biotechnology
  • Bioengineering
  • Applied Microbiology and Biotechnology

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