Moderate thermal post-treatment of digestate to improve biomethane production from agricultural- and food wasteShow others and affiliations
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]
2024-08-062024-08-062024-09-20Bibliographically approved