Peer-Reviewed Journal Details
Mandatory Fields
Dessi, P;Porca, E;Frunzo, L;Lakaniemi, AM;Collins, G;Esposito, G;Lens, PNL
2018
May
International Journal Of Hydrogen Energy
Inoculum pretreatment differentially affects the active microbial community performing mesophilic and thermophilic dark fermentation of xylose
Published
WOS: 2 ()
Optional Fields
CONTINUOUS HYDROGEN FERMENTATION BIOHYDROGEN PRODUCTION MIXED CULTURES WASTE-WATER ANAEROBIC-DIGESTION DEGREES-C SP-NOV SLUDGE BACTERIA REACTORS
43
9233
9245
The influence of different inoculum pretreatments (pH and temperature shocks) on mesophilic (37 degrees C) and thermophilic (55 degrees C) dark fermentative H-2 production from xylose (50 mM) and, for the first time, on the composition of the active microbial community was evaluated. At 37 degrees C, an acidic shock (pH 3, 24 h) resulted in the highest yield of 0.8 mol H2 mol(-1) xylose. The H-2 and butyrate yield correlated with the relative abundance of Clostridiaceae in the mesophilic active microbial community, whereas Lactobacillaceae were the most abundant non-hydrogenic competitors according to RNA-based analysis. At 55 degrees C, Clostridium and Thermoanaerobacterium were linked to H-2 production, but only an alkaline shock (pH 10, 24 h) repressed lactate production, resulting in the highest yield of 1.2 mol H-2 mol(-1) xylose. This study showed that pretreatments differentially affect the structure and productivity of the active mesophilic and thermophilic microbial community developed from an inoculum. (C) 2018 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
0360-3199
10.1016/j.ijhydene.2018.03.117
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