Abstract:
Lump model combining heat and mass transfer in solid substrate fermentation had been developed.The model of heat and mass deviation during fermentation reflects growth of microorganism inLogarithmic and Stationary phases and the effect of heat evaporation and convection. Microbialspecific growth rate equation is a function of temperature was Empirical.Model verification was achieved by comparison of the experiment results of 400 kg (wet) soybeanand Aspergillus oryzae in 1060L static packed bed bioreactor and simulated results from themodel. The maximum differences between the simulated and experimental results are 4.8 K fortemperature and 0.23 g-water/g-bed for water content. The verified model was then sensitivitytested for the substrate density, substrate specific heat, heat yield and water yield coefficient. It wasfound that heat yield coefficient had the most effect on the bed temperature, water content andbiomass concentration. In this work the effect of operating parameters was investigated in order tofind the optimum condition and to design the larger scale packed bed bioreactor. As the result, bedtemperature decreases when inlet air velocity increases and the air velocity was 0.2 m/s. Theoptimum H:D of 0.2 and the bed height of 20 cm were found. In this work the lump model wasalso used to predict 800 kg (wet) soybean fermentation in 2000 L static packed bed bioreactor.