Towards biochar and hydrochar engineering

dc.contributor.authorDieguez-Alonso, Alba
dc.contributor.authorFunke, Axel
dc.contributor.authorAnca-Couce, Andrés
dc.contributor.authorRombolà, Alessandro Girolamo
dc.contributor.authorOjeda, Gerardo
dc.contributor.authorBachmann, Jörg
dc.contributor.authorBehrendt, Frank
dc.date.accessioned2018-03-05T12:28:10Z
dc.date.available2018-03-05T12:28:10Z
dc.date.issued2018-02-27
dc.description.abstractThe 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 NO3- and NH4+ , irrespective of the nitrogen content of the feedstock. For hydrochars, a potential increase in availability of NO3- , NH4+ , PO4 3- , 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.en
dc.description.sponsorshipDFG, 325093850, Open Access Publizieren 2017 - 2018 / Technische Universität Berlinde
dc.identifier.issn1996-1073
dc.identifier.urihttps://depositonce.tu-berlin.de//handle/11303/7495
dc.identifier.urihttp://dx.doi.org/10.14279/depositonce-6715
dc.language.isoenen
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/en
dc.subject.ddc629 Andere Fachrichtungen der Ingenieurwissenschaftende
dc.subject.otherpyrolysisen
dc.subject.otherhydrothermal carbonizationen
dc.subject.otherbiochar engineeringen
dc.subject.otherporosityen
dc.subject.othernutrientsen
dc.subject.otherPolycyclic Aromatic Hydrocarbon (PAH)en
dc.titleTowards biochar and hydrochar engineeringen
dc.title.subtitleinfluence of process conditions on surface physical and chemical properties, thermal stability, nutrient availability, toxicity and wettabilityen
dc.typeArticleen
dc.type.versionpublishedVersionen
dcterms.bibliographicCitation.doi10.3390/en11030496en
dcterms.bibliographicCitation.issue3en
dcterms.bibliographicCitation.journaltitleEnergiesen
dcterms.bibliographicCitation.originalpublishernameMDPIen
dcterms.bibliographicCitation.originalpublisherplaceBaselen
dcterms.bibliographicCitation.pageend26en
dcterms.bibliographicCitation.pagestart1en
dcterms.bibliographicCitation.volume11en
tub.accessrights.dnbfreeen
tub.affiliationFak. 3 Prozesswissenschaften>Inst. Energietechnik>FG Energieverfahrenstechnik und Umwandlungstechniken regenerativer Energiende
tub.affiliation.facultyFak. 3 Prozesswissenschaftende
tub.affiliation.groupFG Energieverfahrenstechnik und Umwandlungstechniken regenerativer Energiende
tub.affiliation.instituteInst. Energietechnikde
tub.publisher.universityorinstitutionTechnische Universität Berlinen
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