Mathematical Modeling of Bioethanol Production from Broomcorn Stalk Using Simultaneous Saccharification and Fermentation Process

In this work, ethanol production from pretreated sorghum stem in two initial enzyme concentrations was studied by simultaneous saccharification and fermentation (SSF) process. Maximum achieved ethanol concentration from this lignocellulosic material was 13.7 (g/L). A mathematical model was developed for SSF process which consists of five ordinary differential equations that describes the variation of five components of Glucose, ethanol, Cell, glycerol and Lactic acid concentrations. The inhibition of ethanol on cellulose conversion and lignin effect on enzyme activity are introduced in order to increase the reliability of proposed model. The parameters were determined using a MATLAB fitting program. The developed model was verified by comparing the model predictions with experimental data obtained from the ethanol production based on pretreated sorghum stem. High determination coefficient R2>0.96 and low value of error MSE