Please use this identifier to cite or link to this item:
Publisher DOI: 10.3389/fchem.2021.779609
Title: Valorization of urban street tree pruning residues in biorefineries by steam refining : conversion into fibers, emulsifiers, and biogas
Language: English
Authors: Hagel, Sebastian 
Lüssenhop, Phillipp  
Walk, Steffen  
Kirjoranta, Satu 
Ritter, Annalena 
Bastidas Jurado, Carla Gabriela 
Mikkonen, Kirsi S. 
Tenkanen, Maija 
Körner, Ina  
Saake, Bodo 
Issue Date: 15-Nov-2021
Publisher: Frontiers Media
Source: Frontiers in Chemistry 9 : 779609 (2021)
Abstract (english): 
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 R₀ = 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.
DOI: 10.15480/882.3899
ISSN: 2296-2646
Journal: Frontiers in Chemistry 
Institute: Abwasserwirtschaft und Gewässerschutz B-2 
Document Type: Article
Project: FACCE SURPLUS 2: kleine, flexible Bioraffinerien für unterschiedliche Inputmaterialien: Teilvorhaben Inventaisierung regionaler Bioressourcen, Wertschöpfung aus Biorafferenie-Reststoffen 
Funded by: Bundesministerium für Bildung und Forschung (BMBF) 
More Funding information: This work was supported by the ERA-NET FACCE-SURPLUS FLEXIBI Project, funded via project manager PTJ (Grant numbers 031B0610A and 031B0610B) by the Federal Ministry of Education and Research (BMBF).
Peer Reviewed: Yes
License: CC BY 4.0 (Attribution) CC BY 4.0 (Attribution)
Appears in Collections:Publications with fulltext

Files in This Item:
File Description SizeFormat
fchem-09-779609.pdfArticle PDF2,83 MBAdobe PDFView/Open
Show full item record

Page view(s)

Last Week
Last month
checked on May 31, 2023


checked on May 31, 2023


Last Week
Last month
checked on Jun 30, 2022

Google ScholarTM


Note about this record

Cite this record


This item is licensed under a Creative Commons License Creative Commons