Hydrogen production potentials and fermentative characteristics of various substrates with different heat-pretreated natural microflora

Yohei Akutsu, Dong Yeol Lee, Yu You Li, Tatsuya Noike

Research output: Contribution to journalArticle

64 Citations (Scopus)

Abstract

Batch tests were carried out to investigate the effects of heat-pretreated inocula on the fermentative hydrogen production characteristics of various types of substrates. A total of 8 different inocula and 4 different substrates (starch, glycerol, oil and peptone) were used. Heat pretreatment of the inocula was conducted in order to harvest spore-forming clostridial bacteria. Significant hydrogen production potentials were observed from starch (20.5-174.4 ml H2/g-CODstarch) and glycerol (11.5-38.1 ml H2/g-CODglycerol); however, almost no hydrogen was produced from oil and peptone. When starch was used as a substrate, two different fermentation patterns were observed, according to the inocula: butyric acid-type and ethanol-type fermentation. Polymerase chain reaction combined with denaturing gradient gel electrophoresis (PCR-DGGE) analysis was conducted to compare the bacterial structures cultivated on the starch medium. Different species of clostridial bacteria were observed between the butyric acid-type and ethanol-type fermentation cultures. When glycerol was used as a substrate, 1,3-propanediol was the main by-product with each inoculum. The results of the present study suggest that simultaneous production of ethanol or 1,3-propanediol in addition to hydrogen is a more promising strategy than conventional hydrogen production in acidogenesis.

Original languageEnglish
Pages (from-to)5365-5372
Number of pages8
JournalInternational Journal of Hydrogen Energy
Volume34
Issue number13
DOIs
Publication statusPublished - 2009 Jul 1

Keywords

  • 1,3-propanediol
  • Hydrogen production
  • Inoculum
  • PCR-DGGE
  • Substrate

ASJC Scopus subject areas

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

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