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The Influence of Temperature on Rheological Parameters and Energy Efficiency of Digestate in a Fermenter of an Agricultural Biogas Plant

cris.virtual.author-orcid0000-0002-5829-502X
cris.virtual.author-orcid0000-0002-7750-9265
cris.virtual.author-orcid0000-0002-5425-4669
cris.virtual.author-orcid0000-0002-7560-4779
cris.virtual.author-orcid0000-0002-6602-2603
cris.virtual.author-orcid0000-0002-7714-9749
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cris.virtual.author-orcid0000-0002-3162-1198
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cris.virtualsource.author-orcid25b4fea8-1bac-418e-b7bf-c26ec1e15244
cris.virtualsource.author-orcid723cb16b-5343-4f7e-a53a-308ccdb5aae2
cris.virtualsource.author-orcidca7a9525-a1fa-41a9-bdc6-9a41a0ea8371
cris.virtualsource.author-orcid59ee70da-6495-4e5a-8159-57f66bea2093
cris.virtualsource.author-orcid56c70f68-f635-4efe-a7ca-bb9fa1981a13
cris.virtualsource.author-orcidc1ffc697-bf57-423f-8744-289bae6f3a38
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cris.virtualsource.author-orcid4cff8168-b6cd-4dca-8c55-0b9f2f7dd173
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dc.abstract.enThis investigation specifically aims to enhance the understanding of digestate flow and mixing behavior across typical temperatures in bioreactors in agricultural biogas plants, facilitating energy-efficient mixing. Experimental tests confirmed that digestate exhibits non-Newtonian characteristics, allowing its flow behavior to be captured by rheological models. This study validated that digestate rheology significantly varies with temperature, which influences flow resistance, mixing efficiency and overall energy requirements. Two rheological models—the Bingham and Ostwald models—were applied to characterize digestate behavior, with the Ostwald model emerging as the most effective for Computational Fluid Dynamic (CFD) simulations, given its balance between predictive accuracy and computational efficiency. Specifically, results suggest that, while three-parameter models, like the Herschel–Bulkley model, offer high precision, their computational intensity is less suitable for large-scale modeling where efficiency is paramount. The small increase in the accuracy of the shearing process description does not compensate for the significant increase in CFD calculation time. Higher temperatures were found to reduce flow resistance, which in turn enables increased flow rates and more extensive mixing zones. This enhanced mass transfer and mixing potential at elevated temperatures are especially pronounced in peripheral areas of the bioreactor, farthest from the agitators. By contributing a model for rheological behavior under realistic bioreactor conditions, this study supports the optimization of energy use in biogas production. These findings emphasize that temperature adjustments within bioreactors could serve as a reliable control strategy to maintain optimal production conditions while minimizing operational costs.
dc.affiliationWydział Inżynierii Środowiska i Inżynierii Mechanicznej
dc.affiliation.instituteKatedra Inżynierii Wodnej i Sanitarnej
dc.affiliation.instituteKatedra Inżynierii Biosystemów
dc.contributor.authorGruszczyński, Maciej Filip
dc.contributor.authorKałuża, Tomasz
dc.contributor.authorCzekała, Wojciech
dc.contributor.authorZawadzki, Paweł
dc.contributor.authorMazurkiewicz, Jakub
dc.contributor.authorMatz, Radosław
dc.contributor.authorPawlak, Maciej
dc.contributor.authorJarzembowski, Paweł
dc.contributor.authorNezhad, Farokh Sahraei
dc.contributor.authorDach, Jacek
dc.date.access2024-12-18
dc.date.accessioned2024-12-18T09:56:54Z
dc.date.available2024-12-18T09:56:54Z
dc.date.copyright2024-11-27
dc.date.issued2024
dc.description.abstract<jats:p>This investigation specifically aims to enhance the understanding of digestate flow and mixing behavior across typical temperatures in bioreactors in agricultural biogas plants, facilitating energy-efficient mixing. Experimental tests confirmed that digestate exhibits non-Newtonian characteristics, allowing its flow behavior to be captured by rheological models. This study validated that digestate rheology significantly varies with temperature, which influences flow resistance, mixing efficiency and overall energy requirements. Two rheological models—the Bingham and Ostwald models—were applied to characterize digestate behavior, with the Ostwald model emerging as the most effective for Computational Fluid Dynamic (CFD) simulations, given its balance between predictive accuracy and computational efficiency. Specifically, results suggest that, while three-parameter models, like the Herschel–Bulkley model, offer high precision, their computational intensity is less suitable for large-scale modeling where efficiency is paramount. The small increase in the accuracy of the shearing process description does not compensate for the significant increase in CFD calculation time. Higher temperatures were found to reduce flow resistance, which in turn enables increased flow rates and more extensive mixing zones. This enhanced mass transfer and mixing potential at elevated temperatures are especially pronounced in peripheral areas of the bioreactor, farthest from the agitators. By contributing a model for rheological behavior under realistic bioreactor conditions, this study supports the optimization of energy use in biogas production. These findings emphasize that temperature adjustments within bioreactors could serve as a reliable control strategy to maintain optimal production conditions while minimizing operational costs.</jats:p>
dc.description.bibliographyil., bibliogr.
dc.description.financepublication_act
dc.description.financecost11320,13
dc.description.if3,0
dc.description.number23
dc.description.points140
dc.description.volume17
dc.identifier.doi10.3390/en17236111
dc.identifier.issn1996-1073
dc.identifier.urihttps://sciencerep.up.poznan.pl/handle/item/2246
dc.identifier.weblinkhttps://www.mdpi.com/1996-1073/17/23/6111
dc.languageen
dc.pbn.affiliationenvironmental engineering, mining and energy
dc.relation.ispartofEnergies
dc.relation.pagesart. 6111
dc.rightsCC-BY
dc.sciencecloudsend
dc.share.typeOPEN_JOURNAL
dc.subject.en"digested pulp
dc.subject.enagricultural biogas plant
dc.subject.eninfluence of temperature
dc.subject.enrheological parameters
dc.subject.enflow behavior
dc.subject.endigested pulp mixing"
dc.titleThe Influence of Temperature on Rheological Parameters and Energy Efficiency of Digestate in a Fermenter of an Agricultural Biogas Plant
dc.typeJournalArticle
dspace.entity.typePublication
oaire.citation.issue23
oaire.citation.volume17