4. Conclusion
Three scenarios of cassava cellulose utilization for ethanol pro- duction were experimentally tested under same conditions and equipments. Based on the experimental results, a rigorous flow- sheet simulation model was established on Aspen plus platform and the cost of cellulase enzyme and steam energy in the three cases was calculated. The results show that the simultaneous co- saccharification of cassava starch/cellulose and ethanol fermenta- tion process (Co-SSF) provided a cost effective option of cassava cellulose utilization in commercial scale, while the utilization of cassava cellulose from cassava ethanol fermentation residues was not economically sound.