Thermochemical treatment of spent coffee grounds via torrefaction: A statistical evidence of biochar properties similarity between inert and oxidative conditions

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dc.contributor.authorPambudi, Suluh
dc.contributor.authorJongyingcharoen, Jiraporn Sripinyowanich
dc.contributor.authorSaechua, Wanphut
dc.date.accessioned2026-08-06T10:45:41Z
dc.date.available2026-08-06T10:45:41Z
dc.date.issued2024-03-01
dc.description.abstractThis study used several statistical analyses to explore the impact of both inert and oxidative conditions on the characteristics of biochar derived from the torrefaction of spent coffee grounds (SCG). The study also considered variations in torrefaction temperature and residence time. Various fuel analyses were conducted, including high heating value (HHV), torrefaction index, proximate characteristics, thermogravimetric analysis (TGA), hygroscopicity, and Fourier-transform infrared spectroscopy (FTIR). The analysis of variance (ANOVA) revealed that the influence of both inert and oxidative conditions on HHV and mass yield was insignificant (p ≥ 0.05). Moreover, considering the same temperature and residence time, principal component analysis (PCA) and hierarchical cluster analysis (HCA) identified oxidative and inert conditions belonging to the same group or cluster. This finding indicated that neither atmospheric condition significantly affected the characteristics of the biochar measured in this research. Therefore, oxidative torrefaction offers significant advantages as it can produce biochar of comparable quality under inert conditions.
dc.identifier.citationResults in Engineering, 21, 2024
dc.identifier.doi10.1016/j.rineng.2024.102012
dc.identifier.issn25901230
dc.identifier.other2-s2.0-85187799098
dc.identifier.urihttps://dspace.kmitl.ac.th/handle/123456789/15526
dc.sourceResults in Engineering
dc.subjectAnalysis of variance
dc.subjectHierarchical cluster analysis
dc.subjectPrincipal component analysis
dc.subjectSpent coffee grounds
dc.subjectTorrefaction
dc.titleThermochemical treatment of spent coffee grounds via torrefaction: A statistical evidence of biochar properties similarity between inert and oxidative conditions
dc.typeArticle

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