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A Comparative Study of Biogas Reactor Fluid Rheology: Implications for Mixing Profile and Power Demand
Linköping University, Department of Thematic Studies, Tema Environmental Change. Linköping University, Faculty of Arts and Sciences. Linköping University, Biogas Research Center.
Linköping University, Department of Thematic Studies, Tema Environmental Change. Linköping University, Faculty of Arts and Sciences. Linköping University, Biogas Research Center.
Linköping University, Department of Thematic Studies, Tema Environmental Change. Linköping University, Faculty of Arts and Sciences. Linköping University, Biogas Research Center. Scandinavian Biogas Fuels AB.
Linköping University, Department of Management and Engineering. Linköping University, Faculty of Science & Engineering.
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2019 (English)In: Processes, ISSN 2227-9717, Processes, ISSN 2227-9717, Vol. 7, no 10Article in journal (Refereed) Published
Abstract [en]

Anaerobic digestion (AD) is an established process for integrating waste management with renewable energy and nutrient recovery. Much of the research in this field focuses on the utilisation of new substrates, yet their effects on operational aspects such as fluid behaviour and power requirement for mixing are commonly overlooked, despite their importance for process optimisation. This study analysed rheological characteristics of samples from 21 laboratory-scale continuous stirred-tank biogas reactors (CSTBRs) digesting a range of substrates, in order to evaluate substrate effect on mixing efficiency and power demand through computational fluid dynamics (CFD). The results show that substrate and process parameters, such as solids content and organic loading, all have a significant effect on CSTBR fluid rheology. The correlation levels between rheological and process parameters were different across substrates, while no specific fluid behaviour patterns could be associated with substrate choice. Substrate should thus be considered an equally important rheology effector as process parameters. Additional substrate-related parameters should be identified to explain the differences in correlations between rheological and process parameters across substrate groups. The CFD modelling revealed that the rheology differences among the AD processes have significant implications for mixing efficiency and power demand of the CSTBRs, highlighting the importance of considering the substrate-induced effects on CSTBR rheology before including a new substrate.

Place, publisher, year, edition, pages
Basel, Switzerland: MDPI, 2019. Vol. 7, no 10
Keywords [en]
anaerobic digestion; viscosity; substrate; computational fluid dynamics; stirring
National Category
Bioenergy
Identifiers
URN: urn:nbn:se:liu:diva-161272DOI: 10.3390/pr7100700ISI: 000495436200062OAI: oai:DiVA.org:liu-161272DiVA, id: diva2:1365768
Funder
EU, FP7, Seventh Framework Programme, 316838Swedish Research Council Formas, 2016-01054Vinnova, 2008-139
Note

Funding agencies:  European CommissionEuropean Commission Joint Research Centre [316838 ATBEST]; Swedish Research Council FormasSwedish Research CouncilSwedish Research Council Formas [2016-01054]; Swedish Innovation Agency [2008-139]

Available from: 2019-10-25 Created: 2019-10-25 Last updated: 2019-11-27Bibliographically approved

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Safaric, LukaShakeri Yekta, SepehrEjlertsson, JörgenNadali Najafabadi, HosseinKarlsson, AnnaSvensson, Bo HBjörn, Annika

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Safaric, LukaShakeri Yekta, SepehrEjlertsson, JörgenSafari, MohammadNadali Najafabadi, HosseinKarlsson, AnnaOmetto, FrancescoSvensson, Bo HBjörn, Annika
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Tema Environmental ChangeFaculty of Arts and SciencesBiogas Research CenterDepartment of Management and EngineeringFaculty of Science & EngineeringApplied Thermodynamics and Fluid Mechanics
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