TY - JOUR
T1 - HRT dependent performance and bacterial community population of granular hydrogen-producing mixed cultures fed with galactose
AU - Kumar, Gopalakrishnan
AU - Sivagurunathan, Periyasamy
AU - Park, Jeong Hoon
AU - Park, Jong Hun
AU - Park, Hee Deung
AU - Yoon, Jeong Jun
AU - Kim, Sang Hyoun
N1 - Funding Information:
This work was supported by National Research Foundation of Korea (NRF) grant funded by the Korea government ( MSIP ) (No. 2014R1A2A2A04005475 ).
PY - 2016/4/1
Y1 - 2016/4/1
N2 - 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.
AB - 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.
KW - Butyrate
KW - Galactose
KW - Granular biomass
KW - Hydraulic retention time
KW - Lactate
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U2 - 10.1016/j.biortech.2016.01.104
DO - 10.1016/j.biortech.2016.01.104
M3 - Article
C2 - 26859326
AN - SCOPUS:84957064152
VL - 206
SP - 188
EP - 194
JO - Bioresource Technology
JF - Bioresource Technology
SN - 0960-8524
ER -