Towards Biochar and Hydrochar Engineering—Influence of Process Conditions on Surface Physical and Chemical Properties, Thermal Stability, Nutrient Availability, Toxicity and Wettability

The impact of conversion process parameters in pyrolysis (maximum temperature, inert gas flow rate) and hydrothermal carbonization (maximum temperature, residence time and post-washing) on biochar and hydrochar properties is investigated. Pine wood (PW) and corn digestate (CD), with low and high ino...

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Bibliographic Details
Published in:Energies (Basel) 2018-03, Vol.11 (3), p.496
Main Authors: Dieguez-Alonso, Alba, Funke, Axel, Anca-Couce, Andrés, Rombolà, Alessandro, Ojeda, Gerardo, Bachmann, Jörg, Behrendt, Frank
Format: Article
Language:English
Subjects:
Availability
biochar engineering
Carbonization
Charcoal
Chemical properties
Corn
Decarboxylation
Dehydration
Flow rates
Flow stability
Flow velocity
Gas flow
High temperature
hydrothermal carbonization
Microporosity
Naphthalene
Nutrient availability
nutrients
Phenanthrene
polycyclic aromatic hydrocarbon (PAH)
Polycyclic aromatic hydrocarbons
porosity
Process parameters
Pyrolysis
Raw materials
Specific surface
Surface area
Thermal stability
Toxicity
Wettability
Wood
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Summary:The impact of conversion process parameters in pyrolysis (maximum temperature, inert gas flow rate) and hydrothermal carbonization (maximum temperature, residence time and post-washing) on biochar and hydrochar properties is investigated. Pine wood (PW) and corn digestate (CD), with low and high inorganic species content respectively, are used as feedstock. CD biochars show lower H/C ratios, thermal recalcitrance and total specific surface area than PW biochars, but higher mesoporosity. CD and PW biochars present higher naphthalene and phenanthrene contents, respectively, which may indicate different reaction pathways. High temperatures (>500 °C) lead to lower PAH (polycyclic aromatic hydrocarbons) content (
ISSN:1996-1073
1996-1073
DOI:10.3390/en11030496