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dc.contributor.authorSørmo, Erlend
dc.contributor.authorSilvani, Ludovica
dc.contributor.authorThune, Gorm
dc.contributor.authorGerber, Helmut
dc.contributor.authorSchmidt, Hans-Peter
dc.contributor.authorCornelissen, Gerard
dc.date.accessioned2020-03-20T06:19:07Z
dc.date.available2020-03-20T06:19:07Z
dc.date.created2020-02-17T16:51:26Z
dc.date.issued2020
dc.identifier.issn0048-9697
dc.identifier.urihttps://hdl.handle.net/11250/2647652
dc.description.abstractPyrolysis of organic waste or woody materials yields a stable carbonaceous product that can be mixed into soil and is often termed “biochar”. During pyrolysis carbon-containing gases are emitted, mainly volatile organic carbon species, carbon monoxide and aerosols. In modern pyrolysis units, gases are after-combusted, which reduces emissions substantially. However, emission data for medium- to large-scale pyrolysis units are scant, both regarding gases, aerosols, heavy metals and polycyclic aromatic hydrocarbons (PAH). Making biochar from lightly contaminated waste timber (WT) is a promising waste handling option as it results in the potential valorization of such residues into e.g. sorbents for contaminant stabilization. For this process to be environmentally sustainable, emissions during the process need to be low and the resulting biochar of sufficient quality. To investigate both issues, we pyrolyzed three batches of WT and one reference batch of clean wood/leaves in a representative medium-scale pyrolysis unit (Pyreg-500, 750 t/year) with after-combustion of the pyrolysis gases, and measured the gas, aerosol, metal and PAH emissions, as well as the characteristics and contamination levels of the resulting biochar, including contaminant leaching. Mean emission factors for the WT were (g/kg biochar); CO = 7 ± 2, non-methane volatile organic compounds (NMVOC) = 0.86 ± 0.14, CH4 = 0, aerosols (PM10) = 0.6 ± 0.3, total products of incomplete combustion (PIC) = 9 ± 3, PAH-16 = (2.0 ± 0.2) · 10−5, As (most abundant metal) = (2.3 ± 1.9) · 10−3 and NOX = 0.65 ± 0.10. There were no significant differences in emission factors between the pyrolysis of WT and the reference respectively, except for PM10, NMVOC, and PAH-16, which were significantly lower for WT than for the clean wood/leaves. The WT biochar did not satisfy premium or basic European Biochar Certificate criteria due to high levels of zinc and PAH. However, leachable metal contents were <0.1% of total contents. Still, use of the WT-biochar without further improvement or investigation would be limited to ex situ use, not improving soil fertility or in situ remediation.
dc.language.isoeng
dc.titleWaste timber pyrolysis in a medium-scale unit: Emission budgets and biochar quality
dc.typePeer reviewed
dc.typeJournal article
dc.description.versionpublishedVersion
dc.source.volume718
dc.source.journalScience of the Total Environment
dc.identifier.doi10.1016/j.scitotenv.2020.137335
dc.identifier.cristin1794981
dc.relation.projectNorges forskningsråd: 243789
dc.relation.projectNorges forskningsråd: 299070
cristin.ispublishedtrue
cristin.fulltextoriginal
cristin.qualitycode2


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