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Hydrochars from industrial macroalgae “Gelidium Sesquipedale” biomass wastes

AuthorsMéndez, A.; Gascó, G.; Ruiz Bobes, Begoña ; Fuente Alonso, Enrique
KeywordsGelidium Sesquipedale biomass
Industrial macroalgae waste
Hydrothermal carbonization
Sustainable hydrochars
Issue Date23-Dec-2018
CitationBioresource Technology 275: 386-393 (2019)
AbstractMacroalgae wastes from the Agar–Agar industry were used as a feedstock to obtain hydrochars by means of hydrothermal carbonization. The effect of temperature (200 °C and 230 °C) and time (2 h and 6 h) on the yield, higher heating value (HHV) and chemical-morphological-textural properties of the hydrochars was studied. The carbon content and the higher heating value were observed to increase with the hydrothermal carbonization. The hydrochars yields (up to 60%) were much higher than yields obtained using conventional char (27.5–33.5%). The hydrochar obtained at 230 °C and after 6 h showed a HHV of 23.25 MJ/kg, which is similar to that of lignite HHV. The H/C and O/C atomic ratios decreased as a consequence of the dehydration and decarboxilation reactions. Hydrothermal carbonization barely changed the vegetal structure of the macroalgae waste. The hydrochars were found to be essentially meso-macroporous with average pore sizes of up to 110.5 nm.
Publisher version (URL)https://doi.org/10.1016/j.biortech.2018.12.074
Appears in Collections:(INCAR) Artículos
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