Abstract
The effects of hydraulic retention times (HRTs-6, 3 and 2 h) on H2 production, operational stability and bacterial population response in a continuously stirred tank reactor (CSTR) were evaluated using galactose. A peak hydrogen production rate (HPR) of 25.9 L H2/L-d was obtained at a 3 h HRT with an organic loading rate (OLR) of 120 g/L-d, while the maximum hydrogen yield (HY) of 2.21 mol H2/mol galactose was obtained at a 6 h HRT (60 g galactose/L-d). Butyrate was dominant and the lactate concentration increased as HRT decreased, which significantly affected the HY. Biomass concentration (VSS) decreased from 16 to 3 g/L at a 2 h HRT, leading to failure. A 3 h HRT supported the favorable growth of Clostridium species, as indicated by an increase in their populations from 25.4% to 27%, while significantly reducing Bacilli populations from 61.6% to 54.2%, indicating that this was the optimal condition.
Original language | English |
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Pages (from-to) | 188-194 |
Number of pages | 7 |
Journal | Bioresource technology |
Volume | 206 |
DOIs | |
Publication status | Published - 2016 Apr 1 |
Bibliographical note
Funding Information:This work was supported by National Research Foundation of Korea (NRF) grant funded by the Korea government ( MSIP ) (No. 2014R1A2A2A04005475 ).
Publisher Copyright:
© 2016 Elsevier Ltd.
Keywords
- Butyrate
- Galactose
- Granular biomass
- Hydraulic retention time
- Lactate
ASJC Scopus subject areas
- Bioengineering
- Environmental Engineering
- Renewable Energy, Sustainability and the Environment
- Waste Management and Disposal