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Moderate thermal post-treatment of digestate to improve biomethane production from agricultural- and food waste
Linköping University, Department of Thematic Studies, Tema Environmental Change. Linköping University, Faculty of Arts and Sciences. Linköping University, Biogas Solutions Research Center.ORCID iD: 0009-0008-8630-8319
Linköping University, Department of Thematic Studies, Tema Environmental Change. Linköping University, Faculty of Arts and Sciences. Linköping University, Biogas Solutions Research Center.ORCID iD: 0000-0001-5260-1826
Linköping University, Department of Thematic Studies, Tema Environmental Change. Linköping University, Faculty of Arts and Sciences. Linköping University, Biogas Solutions Research Center.
Linköping University, Department of Thematic Studies, Tema Environmental Change. Linköping University, Faculty of Arts and Sciences. Linköping University, Biogas Solutions Research Center.
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2024 (English)In: Bioresource Technology Reports, E-ISSN 2589-014X, Vol. 27, article id 101887Article in journal (Refereed) Published
Abstract [en]

The aim of this study was to assess the feasibility of moderate thermal treatment (70 C for one hour) of digestate in combination with post-digestion targeting residual biomethane potentials from three full-scale biogas plants digesting food waste (FW), agricultural waste (AW) and a mixture of AW and manure (AWM). Dissolved organic carbon (DOC), biomethane production, and digestate quality were investigated. For the study six laboratory-scale continuously stirred tank biogas reactors working as post-digesters, with thermally-treated and non-treated digestate were used. DOC for thermally-treated digestates increased significantly (t-test, p < 0.05); FW-digestate (110–200 %), AW-digestate (24–92 %) and for AWM-digestate (4–73 %). Indexes for corresponding DOC quality showed lower apparent organic molecular weights and decreased aromaticity (with the exception of FW-digestate). Thermal treatment of digestate improved the biomethane production during post-digestion by 21–22 % (FW-digestate) and 9 % (AW-digestate). For AMW-digestate no clear positive effect was observed, most likely due to biogas plant operational process disturbances. 

Place, publisher, year, edition, pages
ELSEVIER , 2024. Vol. 27, article id 101887
Keywords [en]
Biogas, Digestate, Thermal treatment, Post-treatment, Post-digestion, Agricultural waste, Food waste
National Category
Renewable Bioenergy Research
Identifiers
URN: urn:nbn:se:liu:diva-206134DOI: 10.1016/j.biteb.2024.101887ISI: 001261070100001OAI: oai:DiVA.org:liu-206134DiVA, id: diva2:1887117
Funder
Swedish Energy Agency, 35624-2
Note

Funding Agencies|Swedish Energy Agency [35624-2]

Available from: 2024-08-06 Created: 2024-08-06 Last updated: 2024-09-20Bibliographically approved

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Axelsson Bjerg, MetteEkstrand, Eva-MariaSundgren, IngridShakeri Yekta, SepehrMoestedt, JanBjörn, Annika

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Axelsson Bjerg, MetteEkstrand, Eva-MariaSundgren, IngridShakeri Yekta, SepehrMoestedt, JanBjörn, Annika
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Tema Environmental ChangeFaculty of Arts and SciencesBiogas Solutions Research Center
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