TY - JOUR
T1 - Physico-chemical properties of hydrochars produced from raw olive pomace using olive mill wastewater as moisture source
AU - Azzaz, Ahmed Amine
AU - Jeguirim, Mejdi
AU - Marks, Evan A.N.
AU - Rad, Carlos
AU - Jellali, Salah
AU - Goddard, Mary Lorène
AU - Ghimbeu, Camelia Matei
N1 - Publisher Copyright:
© 2020 Elsevier Masson SAS. All rights reserved.
PY - 2020
Y1 - 2020
N2 - In this study, we assessed the transformation of raw olive pomace into carbon-rich material using olive mill wastewater (OMWW) as the liquid medium for the hydrothermal carbonization (HTC) process. The findings were compared accordingly with the use of distilled water (DW), which is the conventional practice. The use of OMWW as a liquid matrix enhanced the hydrochar yield, but volatile matter, fixed carbon content, and O/C and H/C ratios followed a decreasing trend. Furthermore, for an HTC temperature of 220 °C, the use of OMWW considerably increased the high heating value of the hydrochars from approximately 24.2 MJ/kg to 31.6 MJ/kg. According to the van Krevelen diagram of feedstock and derived hydrochars, dehydration was the predominant carbonization reaction for both liquid sources. Morphological characterization of both sets of hydrochars indicated the generation of specific carbon nuclei when using DW while OMWW led to the creation of hydrochar with a less homogeneous surface. Structural analysis revealed the heterogeneous aspect of the hydrochar surface with an abundance of crystallized metal-based inorganic salts.
AB - In this study, we assessed the transformation of raw olive pomace into carbon-rich material using olive mill wastewater (OMWW) as the liquid medium for the hydrothermal carbonization (HTC) process. The findings were compared accordingly with the use of distilled water (DW), which is the conventional practice. The use of OMWW as a liquid matrix enhanced the hydrochar yield, but volatile matter, fixed carbon content, and O/C and H/C ratios followed a decreasing trend. Furthermore, for an HTC temperature of 220 °C, the use of OMWW considerably increased the high heating value of the hydrochars from approximately 24.2 MJ/kg to 31.6 MJ/kg. According to the van Krevelen diagram of feedstock and derived hydrochars, dehydration was the predominant carbonization reaction for both liquid sources. Morphological characterization of both sets of hydrochars indicated the generation of specific carbon nuclei when using DW while OMWW led to the creation of hydrochar with a less homogeneous surface. Structural analysis revealed the heterogeneous aspect of the hydrochar surface with an abundance of crystallized metal-based inorganic salts.
KW - High heating value
KW - Hydrothermal carbonization
KW - Liquid characterization
KW - Olive mill wastewater
KW - Raw olive pomace
KW - Solid characterization
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U2 - 10.5802/CRCHIM.61
DO - 10.5802/CRCHIM.61
M3 - Article
AN - SCOPUS:85101242008
SN - 1631-0748
VL - 23
SP - 635
EP - 652
JO - Comptes Rendus Chimie
JF - Comptes Rendus Chimie
IS - 11-12
ER -