Opuntia ficus-indica cladodes are a potential source of solid biofuel from marginal, dry land. Experiments assessed the effects of temperature (180-250 °C), reaction time (0.5-3 h) and biomass to water ratio (B/W; 0.07-0.30) on chars produced via hydrothermal carbonization. Multivariate linear regression demonstrated that the three process parameters are critically important to hydrochar solid yield, while B/W drives energy yield. Heating value increased together with temperature and reaction time and was maximized at intermediate B/W (0.14-0.20). Microscopy shows evidence of secondary char formed at higher temperatures and B/W ratios. X-ray diffraction, thermogravimetric data, microscopy and inductively coupled plasma mass spectrometry suggest that calcium oxalate in the raw biomass remains in the hydrochar; at higher temperatures, the mineral decomposes into CO2 and may catalyze char/tar decomposition.

Hydrothermal carbonization of Opuntia ficus-indica cladodes: Role of process parameters on hydrochar properties / Volpe, Maurizio; Goldfarb, Jillian L.; Fiori, Luca. - In: BIORESOURCE TECHNOLOGY. - ISSN 0960-8524. - STAMPA. - 2018:247(2018), pp. 310-318. [10.1016/j.biortech.2017.09.072]

Hydrothermal carbonization of Opuntia ficus-indica cladodes: Role of process parameters on hydrochar properties

Maurizio Volpe;Luca Fiori
2018-01-01

Abstract

Opuntia ficus-indica cladodes are a potential source of solid biofuel from marginal, dry land. Experiments assessed the effects of temperature (180-250 °C), reaction time (0.5-3 h) and biomass to water ratio (B/W; 0.07-0.30) on chars produced via hydrothermal carbonization. Multivariate linear regression demonstrated that the three process parameters are critically important to hydrochar solid yield, while B/W drives energy yield. Heating value increased together with temperature and reaction time and was maximized at intermediate B/W (0.14-0.20). Microscopy shows evidence of secondary char formed at higher temperatures and B/W ratios. X-ray diffraction, thermogravimetric data, microscopy and inductively coupled plasma mass spectrometry suggest that calcium oxalate in the raw biomass remains in the hydrochar; at higher temperatures, the mineral decomposes into CO2 and may catalyze char/tar decomposition.
2018
247
Volpe, Maurizio; Goldfarb, Jillian L.; Fiori, Luca
Hydrothermal carbonization of Opuntia ficus-indica cladodes: Role of process parameters on hydrochar properties / Volpe, Maurizio; Goldfarb, Jillian L.; Fiori, Luca. - In: BIORESOURCE TECHNOLOGY. - ISSN 0960-8524. - STAMPA. - 2018:247(2018), pp. 310-318. [10.1016/j.biortech.2017.09.072]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11572/194622
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