RT Journal Article
T1 Caproic acid production is linked to biomass activity during xylose fermentation
A1 Iglesias Riobó, Juan
A1 Mauricio Iglesias, Miguel
A1 Carballa Arcos, Marta
K1 CSTR
K1 Hydraulic retention time
K1 Organic loading rate
K1 SBR
K1 Solid retention time
AB This study aims at addressing inconsistencies in literature regarding the organic loading rate (OLR) and hydraulic retention time (HRT) effect on caproic acid production, using biomass activity as an indicator. Xylose was fully consumed in the reference CSTR and SBR (HRT = 1-day; OLR = 12 g COD/(L·d)), but different caproic acid yields (0.02 vs 0.11 Cmol/Cmol-s) were observed, which was linked to differences in biomass activity (12 vs 3.5 g/(g VSS·d)). At HRT 0.5 days, xylose conversion was incomplete and lactic acid and ethanol appeared, reducing caproic acid production. However, increasing xylose concentration in the feeding to 24 g COD/L did not change the caproic acid yield (0.12 Cmol/Cmol-s), which was explained by similar biomass activity as in the reference SBR (4.8 g/(g VSS·d)). These findings indicate that the SBR is the optimal configuration, since it allows maintaining a low biomass activity and therefore a high caproic acid yield.
PB Elsevier
YR 2025
FD 2025-02
LK https://hdl.handle.net/10347/38164
UL https://hdl.handle.net/10347/38164
LA eng
NO Bioresource Technology Volume 418, February 2025, 131952
NO This research was framed in CELL4CHEM project (PCI2021-121989, ERACoBioTech 3rd call) funded by MICIU/AEI/10.13039/501100011033 and the European Union NextGenerationEU/PRTR. The authors belong to a Galician Competitive Research Group (ED431C-2021/37)
DS Minerva
RD 22 abr 2026