Valorization of urban street tree pruning residues in biorefineries by steam refining: conversion into fibers, emulsifiers and biogas

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dc.contributor.author Hagel, Sebastian
dc.contributor.author Kirjoranta, Satu
dc.contributor.author Mikkonen, Kirsi S.
dc.contributor.author Tenkanen, Maija
dc.contributor.author Körner, Ina
dc.contributor.author Saake, Bodo
dc.date.accessioned 2021-11-24T09:52:01Z
dc.date.available 2021-11-24T09:52:01Z
dc.date.issued 2021-11-15
dc.identifier.citation Hagel , S , Kirjoranta , S , Mikkonen , K S , Tenkanen , M , Körner , I & Saake , B 2021 , ' Valorization of urban street tree pruning residues in biorefineries by steam refining: conversion into fibers, emulsifiers and biogas ' , Frontiers in Chemistry , vol. 9 , 779609 . https://doi.org/10.3389/fchem.2021.779609
dc.identifier.other PURE: 169975799
dc.identifier.other PURE UUID: 1a602c2d-fbe5-4cde-8602-fafc9d342a74
dc.identifier.other ORCID: /0000-0003-2883-2717/work/103724883
dc.identifier.other ORCID: /0000-0003-4490-5912/work/103727234
dc.identifier.other WOS: 000726061000001
dc.identifier.other Scopus: 85120562428
dc.identifier.uri http://hdl.handle.net/10138/336692
dc.description.abstract Street tree pruning residues are a widely available and currently undervalorized bioresource. Their utilization could help alleviate an increasing biomass shortage and offset costs of the pruning process for the municipalities. In this work, a holistic valorization pathway of pruning residues leading to fibers, oligosaccharides, biogas, and compost is presented. For this, representative mixtures of tree pruning materials from the most prevalent street tree genera (oak, linden, maple) found in Hamburg (Germany) were prepared by shredding and cleaning procedures. Collection of sample material was performed in summer and winter to account for seasonality. A steam-based fractionation was conducted using treatment severities ranging from log R-0 = 2.5 to 4.0. At the highest severity, a fiber yield of around 66%, and liquor yield of 26-30% was determined. The fibers were evaluated with respect to their properties for paper product applications, with higher treatment severities leading to higher paper strengths. From the oligosaccharide-rich liquor, emulsions were created, which showed promising stability properties over 8 weeks of storage. The liquors and the rejects from the material preparation also displayed good potential for biomethane production. Overall, the differences between material collected in summer and winter were found to be small, indicating the possibility for a year-round utilization of pruning residues. For the presented utilization pathway, high severity treatments were the most promising, featuring a high liquor yield, good biomethane potential, and the highest paper strengths. en
dc.format.extent 14
dc.language.iso eng
dc.relation.ispartof Frontiers in Chemistry
dc.rights cc_by
dc.rights.uri info:eu-repo/semantics/openAccess
dc.subject 116 Chemical sciences
dc.subject tree pruning material
dc.subject biorefinery
dc.subject fibers
dc.subject emulsions
dc.subject biogas
dc.subject steam refining
dc.subject LIGNOCELLULOSIC BIOMASS
dc.subject PRETREATMENT
dc.subject DEGRADATION
dc.subject ETHANOL
dc.subject XYLANS
dc.subject LIGNIN
dc.subject IMPACT
dc.title Valorization of urban street tree pruning residues in biorefineries by steam refining: conversion into fibers, emulsifiers and biogas en
dc.type Article
dc.contributor.organization Food Materials Science Research Group
dc.contributor.organization Department of Food and Nutrition
dc.contributor.organization Helsinki Institute of Sustainability Science (HELSUS)
dc.description.reviewstatus Peer reviewed
dc.relation.doi https://doi.org/10.3389/fchem.2021.779609
dc.relation.issn 2296-2646
dc.rights.accesslevel openAccess
dc.type.version publishedVersion

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