Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7066700 | Bioresource Technology | 2018 | 29 Pages |
Abstract
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 0.356â¯mmol-O2/L/h was needed for growing fungi with a cube-root growth rate constant of 0.03â¯g1/3/L1/3/h. At 1.4â¯VVM aeration the textile bioreactor performed better than others with minimal foaming, yields of 0.22â¯Â±â¯0.01â¯g/g and 0.47â¯Â±â¯0.01â¯g/g for ethanol and biomass, substrate consumption rate of 0.38â¯g/L/h. Operating the bioreactors with air-flowrate to cross-sectional area ratio of 8.75â¯Ãâ¯10â3 (m3/s/m2) or more led to sustained foaming.
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Process Chemistry and Technology
Authors
Osagie A. Osadolor, Mostafa Jabbari, Ramkumar B. Nair, Patrik R. Lennartsson, Mohammad J. Taherzadeh,