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

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http://hdl.handle.net/10138/336692

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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

Titel: Valorization of urban street tree pruning residues in biorefineries by steam refining: conversion into fibers, emulsifiers and biogas
Författare: Hagel, Sebastian; Kirjoranta, Satu; Mikkonen, Kirsi S.; Tenkanen, Maija; Körner, Ina; Saake, Bodo
Upphovmannens organisation: Food Materials Science Research Group
Department of Food and Nutrition
Helsinki Institute of Sustainability Science (HELSUS)
Datum: 2021-11-15
Språk: eng
Sidantal: 14
Tillhör serie: Frontiers in Chemistry
ISSN: 2296-2646
DOI: https://doi.org/10.3389/fchem.2021.779609
Permanenta länken (URI): http://hdl.handle.net/10138/336692
Abstrakt: 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.
Subject: 116 Chemical sciences
tree pruning material
biorefinery
fibers
emulsions
biogas
steam refining
LIGNOCELLULOSIC BIOMASS
PRETREATMENT
DEGRADATION
ETHANOL
XYLANS
LIGNIN
IMPACT
Referentgranskad: Ja
Licens: cc_by
Användningsbegränsning: openAccess
Parallelpublicerad version: publishedVersion


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