Abstract：
:To identify the key bacterial populations in hydrogen fermentation of galactose, a fermentor seeded with a heat-treated sludge was operated. After 27h of fermentation, the proportion of butyric acid increased to 69.4wt.% and the gas production yield reached 1.0molH2/molgalactose. In the pyrosequencing of 16S rDNA, an increase of the proportion of the phylum Firmicutes from 4.2% to 92% (mostly cluster I Clostridium) was observed. To verify the predominance and the ubiquity of the cluster, five fermentors seeded with different heat-treated anaerobic sludges having different feedstock compositions and digestion temperatures were investigated using qPCR analyses. The abundance of the cluster increased >100-fold during the fermentation, regardless of the inocula. Moreover, the abundance was negatively correlated with the lag time of hydrogen production and positively correlated with the hydrogen production rate, demonstrating the relevance of the cluster to hydrogen production. Taken together, the results clearly revealed the importance of cluster I Clostridium in the hydrogen fermentation of galactose.
journal_name
Bioresour Technoljournal_title
Bioresource technologyauthors
Park JH,Lee SH,Yoon JJ,Kim SH,Park HDdoi
10.1016/j.biortech.2014.01.081subject
Has Abstractpub_date
2014-04-01 00:00:00pages
98-106eissn
0960-8524issn
1873-2976pii
S0960-8524(14)00106-0journal_volume
157pub_type
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