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Bio-hydrogen production from thin stillage using conventional and acclimatized anaerobic digester sludge

Authors
Journal
International Journal of Hydrogen Energy
0360-3199
Publisher
Elsevier
Publication Date
Volume
36
Issue
20
Identifiers
DOI: 10.1016/j.ijhydene.2011.07.032
Keywords
  • Biological Hydrogen Production
  • Food-To-Microorganisms Ratio
  • Anaerobic Digested Sludge
  • Hydrogen Producers
  • Acclimatized Digested Sludge
  • Pcr-Dgge

Abstract

Abstract To assess the viability of biohydrogen production from thin stillage, a comparative evaluation of anaerobic digester sludge (ADS) and acclimatized anaerobic digester sludge (AADS) for biohydrogen production over a wide range of S 0/X 0 ratio (0.5–8 gCOD/gVSS) was performed. A maximum hydrogen yield of 19.5 L H 2/L thin stillage was achieved for the AADS while tests with ADS achieved a maximum yield of only 7.5 L H 2/L thin stillage. The optimum range of S 0/X 0 ratio for hydrogen production was found to be 1 to 2 gCOD/gVSS using conventional ADS and 3 to 6 gCOD/gVSS using AADS. The biomass specific hydrogen production rate for the AADS was 3.5 times higher than rate for the ADS throughout the range of S 0/X 0 ratio examined in this study. The DGGE profiles of the 16S rDNA gene fragments confirmed the superior performance of the AADS over the ADS, showing that the widely known hydrogen producers Clostridium acetobutyricum, Klebsiella pneumonia, Clostridium butyricum and Clostridium pasteurianum were the predominant species.

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