Co-fermentation of glucose, starch, and cellulose for mesophilic biohydrogen production
Dark fermentation
Fermentative hydrogen production
DOI:
10.1016/j.ijhydene.2014.10.079
Publication Date:
2014-11-07T16:54:46Z
AUTHORS (9)
ABSTRACT
Abstract The aim of this study was to assess the synergistic effects of co-fermentation of glucose, starch, and cellulose using anaerobic digester sludge (ADS) on the biohydrogen (H 2 ) production and the associated microbial communities. Yields of H 2 were 1.22, 1.00, and 0.15 mol H 2 /mol hexose-added in fermentation reactions containing glucose, starch, and cellulose as mono-substrates. The H 2 yields were greater by an average of 27 ± 4% than expected in all the different co-substrate conditions, which affirmed that co-fermentation of different substrates improved the H 2 potential. Glucose addition to starch and/or cellulose favored acetate synthesis, while cellulose degradation was associated with the propionate synthesis pathway. Illumina sequencing technology and bioinformatics analyses revealed operational taxonomic units (OTUs) in the Phyla Bacteroides , Chloroflexi , Firmicutes , Proteobacteria , Spirochaetes , Synergistes , and Thermotogae were common in mono- and co-substrate batches. However, OTUs in the Phyla Acidobacteria , Actinobacteria , and Bacteroidetesee were unique to only the co-substrate conditions.
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