Hydrothermal carbonization and torrefaction of grape pomace: A comparative evaluation

•Chars were produced from grape pomace by hydrocarbonization and torrefaction.•Fuel qualities of hydrochars were compared to pyrochars.•Hydrochars have higher combustion reactivity than pyrochars.•Waste solution from hydrocarbonization shows antioxidant activity. Grape pomace was treated by hydrothe...

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Bibliographic Details
Published in:Bioresource technology 2014-06, Vol.161, p.255-262
Main Authors: Pala, Mehmet, Kantarli, Ismail Cem, Buyukisik, Hasan Baha, Yanik, Jale
Format: Article
Language:English
Subjects:
Antioxidants - analysis
Biochar
Biofuels
Biological and medical sciences
Charcoal - chemistry
Fundamental and applied biological sciences. Psychology
Hot Temperature
Hydrochar
Hydrothermal carbonization
Torrefaction
Vitaceae
Vitis - chemistry
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Summary:•Chars were produced from grape pomace by hydrocarbonization and torrefaction.•Fuel qualities of hydrochars were compared to pyrochars.•Hydrochars have higher combustion reactivity than pyrochars.•Waste solution from hydrocarbonization shows antioxidant activity. Grape pomace was treated by hydrothermal carbonization (sub-critical water, 175–275°C) and torrefaction (nitrogen atmosphere, 250 and 300°C), with mass yield of solid product (char) ranging between 47% and 78%, and energy densification ratio to 1.42–1.15 of the original feedstock. The chars were characterised with respect to their fuel properties, morphological and structural properties and combustion characteristics. The hydrothermal carbonization produced the char with greater energy density than torrefaction. The chars from torrefaction were found to be more aromatic in nature than that from hydrothermal carbonization. Hydrothermal carbonization process produced the char having high combustion reactivity. Most interesting was the finding that aqueous phase from hydrothermal carbonization had antioxidant activity. The results obtained in this study showed that HTC appears to be promising process for a winery waste having high moisture content.
ISSN:0960-8524
1873-2976
DOI:10.1016/j.biortech.2014.03.052