Journal
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
Volume 34, Issue 2, Pages 783-790Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2008.11.007
Keywords
Anaerobic fluidized bed reactor; Biofilm; Dark fermentation; Expanded clay; Hydrogen production
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Funding
- CNPq [141197/2007-2, 130551/2007-4, 152215/2007-7]
- FAPESP [05/51702-9, 07/58564-6]
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This study evaluated hydrogen production in an anaerobic fluidized bed reactor (AFBR) fed with glucose-based synthetic wastewater. Particles of expanded clay (2.8-3.35 mm) were used as a support material for biomass immobilization. The reactor was operated with hydraulic retention times (HRT) ranging from 8 to 1 h. The hydrogen yield production increased from 1.41 to 2.49 mol H-2 Mol(-1) glucose as HRT decreased from 8 to 2 h. However, when HRT was 1 h, there was a slight decrease to 2.41 mol H-2 Mol(-1) glucose. The biogas produced was composed of H-2 and CO2, and the H-2 content increased from 8% to 35% as HRT decreased. The major soluble metabolites during H-2 fermentation were acetic acid (HAc) and butyric acid (HBu), accounting for 36.1-53.3% and 37.7-44.9% of total soluble metabolites, respectively. Overall, the results demonstrate the potential of using expanded clay as support material for hydrogen production in AFBRs. (c) 2008 International Association for Hydrogen Energy. Published by Elsevier Ltd. All rights reserved.
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