Valorization of Urban Street Tree Pruning Residues in Biorefineries by Steam Refining: Conversion Into Fibers, Emulsifiers, and Biogas
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 leadin...
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Frontiers Media S.A.
2021
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oai:doaj.org-article:dfda5364440f4ed9bc29dffe7a3e6f5d2021-11-15T06:23:04ZValorization of Urban Street Tree Pruning Residues in Biorefineries by Steam Refining: Conversion Into Fibers, Emulsifiers, and Biogas2296-264610.3389/fchem.2021.779609https://doaj.org/article/dfda5364440f4ed9bc29dffe7a3e6f5d2021-11-01T00:00:00Zhttps://www.frontiersin.org/articles/10.3389/fchem.2021.779609/fullhttps://doaj.org/toc/2296-2646Street 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.Sebastian HagelPhillipp LüssenhopSteffen WalkSatu KirjorantaAnnalena RitterCarla Gabriela Bastidas JuradoKirsi S. MikkonenKirsi S. MikkonenMaija TenkanenMaija TenkanenIna KörnerBodo SaakeFrontiers Media S.A.articletree pruning materialbiorefineryfibersemulsionsbiogassteam refiningChemistryQD1-999ENFrontiers in Chemistry, Vol 9 (2021) |
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| collection |
DOAJ |
| language |
EN |
| topic |
tree pruning material biorefinery fibers emulsions biogas steam refining Chemistry QD1-999 |
| spellingShingle |
tree pruning material biorefinery fibers emulsions biogas steam refining Chemistry QD1-999 Sebastian Hagel Phillipp Lüssenhop Steffen Walk Satu Kirjoranta Annalena Ritter Carla Gabriela Bastidas Jurado Kirsi S. Mikkonen Kirsi S. Mikkonen Maija Tenkanen Maija Tenkanen Ina Körner Bodo Saake Valorization of Urban Street Tree Pruning Residues in Biorefineries by Steam Refining: Conversion Into Fibers, Emulsifiers, and Biogas |
| description |
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. |
| format |
article |
| author |
Sebastian Hagel Phillipp Lüssenhop Steffen Walk Satu Kirjoranta Annalena Ritter Carla Gabriela Bastidas Jurado Kirsi S. Mikkonen Kirsi S. Mikkonen Maija Tenkanen Maija Tenkanen Ina Körner Bodo Saake |
| author_facet |
Sebastian Hagel Phillipp Lüssenhop Steffen Walk Satu Kirjoranta Annalena Ritter Carla Gabriela Bastidas Jurado Kirsi S. Mikkonen Kirsi S. Mikkonen Maija Tenkanen Maija Tenkanen Ina Körner Bodo Saake |
| author_sort |
Sebastian Hagel |
| title |
Valorization of Urban Street Tree Pruning Residues in Biorefineries by Steam Refining: Conversion Into Fibers, Emulsifiers, and Biogas |
| title_short |
Valorization of Urban Street Tree Pruning Residues in Biorefineries by Steam Refining: Conversion Into Fibers, Emulsifiers, and Biogas |
| title_full |
Valorization of Urban Street Tree Pruning Residues in Biorefineries by Steam Refining: Conversion Into Fibers, Emulsifiers, and Biogas |
| title_fullStr |
Valorization of Urban Street Tree Pruning Residues in Biorefineries by Steam Refining: Conversion Into Fibers, Emulsifiers, and Biogas |
| title_full_unstemmed |
Valorization of Urban Street Tree Pruning Residues in Biorefineries by Steam Refining: Conversion Into Fibers, Emulsifiers, and Biogas |
| title_sort |
valorization of urban street tree pruning residues in biorefineries by steam refining: conversion into fibers, emulsifiers, and biogas |
| publisher |
Frontiers Media S.A. |
| publishDate |
2021 |
| url |
https://doaj.org/article/dfda5364440f4ed9bc29dffe7a3e6f5d |
| work_keys_str_mv |
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| _version_ |
1718428587898437632 |