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Effect of media rheology and bioreactor hydrodynamics on filamentous fungi fermentation of lignocellulosic and starch-based substrates under pseudoplastic flow conditions
University of Borås, Faculty of Textiles, Engineering and Business.ORCID iD: 0000-0003-3488-4003
University of Borås, Faculty of Textiles, Engineering and Business.ORCID iD: 0000-0002-1404-9134
University of Borås, Faculty of Textiles, Engineering and Business.ORCID iD: 0000-0001-5719-7252
University of Borås, Faculty of Textiles, Engineering and Business.
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2018 (English)In: Bioresource Technology, ISSN 0960-8524, E-ISSN 1873-2976, Vol. 263, p. 250-257Article in journal (Refereed) Published
Abstract [en]

The aim of this work was to study how media rheology and bioreactor hydrodynamics would influence fermentation of lignocellulosic and starch-based substrates under pseudoplastic flow conditions. This was investigated using hydrolyzed wheat straw, wheat-based thin stillage and filamentous fungi as inoculum in bubble column, airlift and horizontal hybrid tubular/bubble column (textile bioreactor) bioreactors. The rheological models showed that the consistency index was dependent on biomass growth (R2 0.99) while the flow behavior index depended on biomass growth and suspended solid (R2 0.99). Oxygen transfer rate above 0.356 mmol-O2/L/h was needed for growing fungi with a cube-root growth rate constant of 0.03 g1/3/L1/3/h. At 1.4 VVM aeration the textile bioreactor performed better than others with minimal foaming, yields of 0.22 ± 0.01 g/g and 0.47 ± 0.01 g/g for ethanol and biomass, substrate consumption rate of 0.38 g/L/h. Operating the bioreactors with air-flowrate to cross-sectional area ratio of 8.75 × 10−3 (m3/s/m2) or more led to sustained foaming.

Place, publisher, year, edition, pages
2018. Vol. 263, p. 250-257
Keywords [en]
Foaming Oxygen transfer rate, Rheology model, Fungi growth kinetics, Bioreactor hydrodynamics
National Category
Chemical Process Engineering
Research subject
Resource Recovery
Identifiers
URN: urn:nbn:se:hb:diva-14345DOI: 10.1016/j.biortech.2018.04.093ISI: 000439317100030Scopus ID: 2-s2.0-85046700875OAI: oai:DiVA.org:hb-14345DiVA, id: diva2:1222133
Available from: 2018-06-21 Created: 2018-06-21 Last updated: 2018-11-29Bibliographically approved

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Osadolor, Osagie AlexJabbari, MostafaNair, Ramkumar BLennartsson, Patrik R.Taherzadeh, Mohammad J

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Osadolor, Osagie AlexJabbari, MostafaNair, Ramkumar BLennartsson, Patrik R.Taherzadeh, Mohammad J
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Bioresource Technology
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