Towards biochar and hydrochar engineering-influence of process conditions on surface physical and chemical properties, thermal stability, nutrient availability, toxicity and wettability
Diéguez Alonso, Alba (Technische Universität Berlin)
Funke, Axel (Karlsruhe Institute of Technology)
Anca-Couce, Andrés (Graz University of Technology)
Rombolà, Alessandro Girolamo (Università di Bologna)
Ojeda Castro, Franklin Gerardo (Centre de Recerca Ecològica i d'Aplicacions Forestals)
Bachmann, Jörg (Leibniz University of Hannover)
Behrendt, Frank (Technische Universität Berlin)

Data:	2018
Resum:	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 (<12 mg/kg) and higher specific surface area. With increasing process severity the biochars carbon content is also enhanced, as well as the thermal stability. High inert gas flow rates increase the microporosity and wettability of biochars. In hydrochars the high inorganic content favor decarboxylation over dehydration reactions. Hydrochars show mainly mesoporosity, with a higher pore volume but generally lower specific surface area than biochars. Biochars present negligible availability of NO and NH , irrespective of the nitrogen content of the feedstock. For hydrochars, a potential increase in availability ofNO ,NH , PO , and K with respect to the feedstock is possible. The results from this work can be applied to "engineer" appropriate biochars with respect to soil demands and certification requirements. c 2018 by the authors. Licensee MDPI, Basel, Switzerland.
Drets:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original.
Llengua:	Anglès
Document:	Article ; recerca ; Versió publicada
Matèria:	Pyrolysis ; Hydrothermal carbonization ; Biochar engineering ; Porosity ; Nutrients ; Polycyclic aromatic hydrocarbon (PAH)
Publicat a:	Energies, Vol. 11, Issue 3 (March 2018) , art. 496, ISSN 1996-1073

DOI: 10.3390/en11030496

26 p, 1.1 MB

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