title: Engineered heat treated methanogenic granules: a promising biotechnological approach for extreme thermophilic biohydrogen production.
abstract: In the present study, two granular systems were compared in terms of hydrogen production rate, stability and bacterial diversity under extreme thermophilic conditions (70 degrees C). Two EGSB reactors were individually inoculated with heat treated methanogenic granules (HTG) and HTG amended with enrichment culture with high capacity of hydrogen production (engineered heat treated methanogenic granules - EHTG), respectively. The reactor inoculated with EHTG (R(EHTG)) attained a maximum production rate of 2.7l H(2)l(-1)day(-1) in steady state. In comparison, the R(HTG) containing the HTG granules was very unstable, with low hydrogen productions and only two peaks of hydrogen (0.8 and 1.5l H(2)l(-1)day(-1)). The presence of active hydrogen producers in the R(EHTG) system during the reactor start-up resulted in the development of an efficient H(2)-producing bacterial community. The results showed that "engineered inocula" where known hydrogen producers are co-inoculated with HTG is an efficient way to start up biohydrogen-producing reactors.
authors: Department of Environmental Engineering, Technical University of Denmark, Bygningstorvet 115, DK-2800, Kgs Lyngby, Denmark. angela_abreu@deb.uminho.pt
authors: Angela A
authors: AA
authors: Abreu
authors: Joana I
authors: JI
authors: Alves
authors: M Alcina
authors: MA
authors: Pereira
authors: Dimitar
authors: D
authors: Karakashev
authors: M Madalena
authors: MM
authors: Alves
authors: Irini
authors: I
authors: Angelidaki
mesh_terms: D001089:Arabinose / Q000378:metabolism; D001419:Bacteria / Q000235:genetics / Q000254:growth & development; D001483:Base Sequence; D056804:Biofuels / Q000032:analysis*; D019149:Bioreactors / Q000382:microbiology; D001709:Biotechnology / Q000379:methods*; D050260:Carbohydrate Metabolism; D058645:Denaturing Gradient Gel Electrophoresis; D005285:Fermentation; D005947:Glucose / Q000378:metabolism; D006358:Hot Temperature; D006859:Hydrogen / Q000378:metabolism*; D008697:Methane / Q000378:metabolism*; D008969:Molecular Sequence Data; D010802:Phylogeny; D012336:RNA, Ribosomal, 16S / Q000235:genetics; D012995:Solubility; D013997:Time Factors
chemical_list: D056804:Biofuels; D012336:RNA, Ribosomal, 16S; D006859:Hydrogen; D001089:Arabinose; D005947:Glucose; D008697:Methane