Table 3. Comparison of various ethanol productions using pretreated corn stover as the substrate found in the literatures and in the current study.

Pretreated method	Fermentation method	Hydrolysis Temp. (°C)	Temp. in SSF (°C)	Pre-hydrolysis time (h)	Fermentation time (h)	Enzyme loadings	Ethanol concentration (g/L)	Reference
LHW	Fed-batch S-SSF	50	36	18	60	Cellulase 30–35 FPU/g substrate	39.4	In this work
Alkaline	SSF	-	33	-	72	Cellulase 20 FPU/g substrate, β-glucosidase 10 CBU/g substrate	27.8	[58]
Dilute sulfuric acid	SHF	45	35	72	72	Cellulase 15 FPU/g substrate, β-glucosidase 9 CBU/g substrate	30.6	[59]
Dilute phosphoric acid	SHF	45	35	72	48	Cellulase 15 FPU/g substrate, β-glucosidase 9 CBU/g substrate	26.4	[60]
Fungal	SSF	-	37	-	72	Cellulase 10 FPU/g solid	25.0	[61]