Abstract
The employment of hemicellulose fractions from bagasse acid (HF-AC - rich in xylose) and hydrothermal (HF-HT - containing high amounts of xylooligosaccharides) pretreatments led to yields of 265 and 177 mLH2/gcarbohydrate after 18 and 45 h of fermentation, respectively. The anaerobic sludge used as inoculum was able to hydrolyze the xylooligosaccharides of HF-HT into simpler sugars, enabling microbial hydrogen production. The acid hydrolysis of xylooligosaccharides in HF-HT before fermentation improved the productivity by 30% and showed similar yield (231 mLH2/gcarbohydrate). The adaptive phase for HF-HT consumption was influenced by the hydrolytic step and by inhibitors, as the kinetics of hydrolyzed HF-HT was deeply affected in the first 18 h compared to HF-AC. Higher amounts of HF-AC in the media promoted fermentation inhibition, which could be related to the increased concentrations of acetic acid and carbohydrates, two factors that enhance the system osmolarity.
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