Ir. M.A.I. Schutyser : Mixed solid-state fermentation

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25 Jun 2003 13:30
Unit: Wageningen University
Location: Aula (gebouw 362), Gen. Foulkesweg 1, Wageningen
Promotor: prof.dr. R.M. Boom (Food Process Engineering)prof.dr. W.J. Briels (University of Twente)
Co Promotor: dr.ir. A. Rinzema

 This thesis reports about discontinuously mixed solid-state fermentation (SSF). SSF involves the cultivation of microorganism, such as fungi, on moist solid substrates. Industrial application of SSF is scarce due to the limited knowledge about reactor design and operation. A discrete particle model was developed describing processes during SSF in great detail. Both radial and axial mixing in a rotating drum fermentor were predicted accurately. The mixing behavior in a conical ribbon mixer was also modeled. Subsequently, the model was extended with heat conduction and water transfer during spraying of water. Aggregation of substrate particles by mycelium was successfully described. By combining the discrete particle model and a continuum model for the gas phase, evaporative cooling and fungal growth were implemented. This research resulted in an increase of our knowledge about reactor design and operation of solid-state fermentors. However, it also offers perspectives for studies to similar granular systems.
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