Improving cellulosic ethanol fermentation efficiency by converting endogenous water-soluble carbohydrates into citric acid before pretreatment.
Bioprocess Biosyst Eng
; 42(7): 1099-1103, 2019 Jul.
Article
in En
| MEDLINE
| ID: mdl-30911817
ABSTRACT
Water-soluble carbohydrates in raw lignocellulosic biomass are converted into hydroxymethylfurfural (HMF) in the acid-based pretreatment, thus increasing the detoxification intensity and reducing the fermentation efficiency of cellulosic ethanol. Therefore, reducing water-soluble carbohydrates in raw corn stover is crucially important to reduce the inhibitors' generation and improve the ethanol fermentation efficiency. In this study, aerobic solid-state fermentation of corn stover by inoculating Aspergillus niger spores converted 83% of the endogenous water-soluble carbohydrates into citric acid, leading to the decrease of 41% of HMF generation and 8% of sulfuric acid usage during the dry acid pretreatment. The reduced inhibitor generation improved the ethanol fermentability by 11% more ethanol than that of the corn stover without water-soluble carbohydrates' removal. This suggests that the removal of the water-soluble carbohydrates before pretreatment significantly reduced the inhibitors' generation in pretreatment and improved the fermentation efficiency of cellulosic ethanol.
Key words
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Aspergillus niger
/
Biomass
/
Citric Acid
/
Zea mays
/
Ethanol
/
Lignin
Language:
En
Journal:
Bioprocess Biosyst Eng
Journal subject:
BIOTECNOLOGIA
/
ENGENHARIA BIOMEDICA
Year:
2019
Type:
Article
Affiliation country:
China