TY - JOUR
T1 - Valorization of oat husk by hydrothermal carbonization
T2 - Optimization of process parameters and anaerobic digestion of spent liquors
AU - Murillo, Herman A.
AU - Pagés-Díaz, Jhosané
AU - Díaz-Robles, Luis A.
AU - Vallejo, Fidel
AU - Huiliñir, César
N1 - Publisher Copyright:
© 2021 Elsevier Ltd
PY - 2022/1
Y1 - 2022/1
N2 - The hydrothermal carbonization (HTC) optimization of oat husk was performed using a response surface methodology. Furthermore, anaerobic digestion (AD) of spent liquor and hydrochar addition were evaluated in the biomethane potential (BMP) test. Results found that temperature influences the most in the studied responses (i.e., mass yield (MY) and higher heating value (HHV)). Optimal hydrochar MY (53.8%) and HHV (21.5 MJ/kg) were obtained for 219.2 °C, 30 min, and 0.08 of biomass/water ratio. A successful prediction capability of the optimization approach was observed, archiving an error < 1% between predicted and validated responses. The BMP experiment showed the feasibility of spent liquor as a potential substrate to be treated by AD (144 NmLCH4/gCOD). Hydrochar boosted the methane production of spent liquor increasing up to 17% compared to digestion with no hydrochar addition. These findings provide new insights regarding oat husk valorization by integrating HTC and AD for energy production.
AB - The hydrothermal carbonization (HTC) optimization of oat husk was performed using a response surface methodology. Furthermore, anaerobic digestion (AD) of spent liquor and hydrochar addition were evaluated in the biomethane potential (BMP) test. Results found that temperature influences the most in the studied responses (i.e., mass yield (MY) and higher heating value (HHV)). Optimal hydrochar MY (53.8%) and HHV (21.5 MJ/kg) were obtained for 219.2 °C, 30 min, and 0.08 of biomass/water ratio. A successful prediction capability of the optimization approach was observed, archiving an error < 1% between predicted and validated responses. The BMP experiment showed the feasibility of spent liquor as a potential substrate to be treated by AD (144 NmLCH4/gCOD). Hydrochar boosted the methane production of spent liquor increasing up to 17% compared to digestion with no hydrochar addition. These findings provide new insights regarding oat husk valorization by integrating HTC and AD for energy production.
KW - Anaerobic digestion
KW - Hydrothermal carbonization
KW - Oat husk
KW - Process optimization
KW - Spent liquors
UR - http://www.scopus.com/inward/record.url?scp=85117198761&partnerID=8YFLogxK
U2 - 10.1016/j.biortech.2021.126112
DO - 10.1016/j.biortech.2021.126112
M3 - Article
C2 - 34648962
AN - SCOPUS:85117198761
SN - 0960-8524
VL - 343
JO - Bioresource Technology
JF - Bioresource Technology
M1 - 126112
ER -
