Applied Microbiology and Biotechnology

, Volume 76, Issue 2, pp 473–482

Biotechnological intensification of biogas production

  • Zoltán Bagi
  • Norbert Ács
  • Balázs Bálint
  • Lenke Horváth
  • Krisztina Dobó
  • Katalin R. Perei
  • Gábor Rákhely
  • Kornél L. Kovács
Environmental Biotechnology

DOI: 10.1007/s00253-007-1009-6

Cite this article as:
Bagi, Z., Ács, N., Bálint, B. et al. Appl Microbiol Biotechnol (2007) 76: 473. doi:10.1007/s00253-007-1009-6

Abstract

The importance of syntrophic relationships among microorganisms participating in biogas formation has been emphasized, and the regulatory role of in situ hydrogen production has been recognized. It was assumed that the availability of hydrogen may be a limiting factor for hydrogenotrophic methanogens. This hypothesis was tested under laboratory and field conditions by adding a mesophilic (Enterobacter cloacae) or thermophilic hydrogen-producing (Caldicellulosyruptor saccharolyticus) strain to natural biogas-producing consortia. The substrates were waste water sludge, dried plant biomass from Jerusalem artichoke, and pig manure. In all cases, a significant intensification of biogas production was observed. The composition of the generated biogas did not noticeably change. In addition to being a good hydrogen producer, C. saccharolyticus has cellulolytic activity; hence, it is particularly suitable when cellulose-containing biomass is fermented. The process was tested in a 5-m3 thermophilic biogas digester using pig manure slurry as a substrate. Biogas formation increased at least 160–170% upon addition of the hydrogen-producing bacteria as compared to the biogas production of the spontaneously formed microbial consortium. Using the hydrogenase-minus control strain provided evidence that the observed enhancement was due to interspecies hydrogen transfer. The on-going presence of C. saccharolyticus was demonstrated after several months of semicontinuous operation.

Keywords

BiogasHydrogenInterspecies electron transferIntensificationSyntrophyThermophilic

Copyright information

© Springer-Verlag 2007

Authors and Affiliations

  • Zoltán Bagi
    • 1
    • 2
  • Norbert Ács
    • 1
    • 2
  • Balázs Bálint
    • 1
    • 2
  • Lenke Horváth
    • 1
    • 2
  • Krisztina Dobó
    • 1
    • 2
  • Katalin R. Perei
    • 1
    • 2
  • Gábor Rákhely
    • 1
    • 2
  • Kornél L. Kovács
    • 1
    • 2
  1. 1.Department of BiotechnologyUniversity of SzegedSzegedHungary
  2. 2.Institute of Biophysics, Biological Research CenterHungarian Academy of SciencesSzegedHungary