Journal
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
Volume 39, Issue 18, Pages 9599-9610Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2014.04.104
Keywords
High organic loading rates; Hydraulic retention time; Inhibitory VFA; Microbial community
Categories
Funding
- FAPESP - Sao Paulo Research Foundation
- CNPq - Conselho Nacional de Desenvolvimento Cientifico e Tecnologico, Brazil
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Two continuous anaerobic fluidized bed reactors (AFBRs) were operated under thermophilic (55 degrees C) temperature for 150 days to investigate the effect of dark H-2 fermentation of diluted and raw sugarcane vinasse on H-2 production using mixed seed sludge. Although effective H-2 production (52.8% of H-2; 0.80 L H-2 h(-1) L-1; 0.79 mmol gCOD(added)(-1) was observed using an elevated substrate concentration (30,000 mg COD L-1), the optimal operational conditions were found for the AFBR(1) (10,000 mg COD L-1) fed with diluted sugarcane vinasse (HRT 6 h; OLR 40 kg COD m(-3) d(-1)), achieving a H-2 yield of 2.86 mmol H-2 g CODadded-1. H-2 production was inhibited by elevated volatile fatty acid (VFA) concentrations (butyric and acetic acids = 3.7 and 3.0 g L-1, respectively) in the raw feedstock. Denaturing gradient gel electrophoresis (DGGE) analyses revealed changes in the bacterial population of the expanded clay biofilm as a function of the substrate concentration. Copyright (C) 2014, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.
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