SSF production of lactic acid from cellulosic biosludges.
The use of cellulosic biosludges generated in a Kraft pulp mill was investigated as substrate for lactic acid production by simultaneous saccharification and fermentation (SSF). The effect of the operation mode (batch or fedbatch), the initial liquid to solid ratio (12 or 30 g/g) and the nutrient supplementation (MRS components or none) on several parameters including lactic acid concentration, volumetric productivity and product yields, were evaluated. When the operation was carried out in fedbatch mode with nutrient supplementation and using a LSR(0)=12 g/g, a broth containing 42 g/L was obtained after 48 h with a volumetric productivity of 0.87 g/L h and a product yield of 37.8 g lactic acid/100 g biosludges. In a similar experiment carried out without nutrient supplementation, a lactic acid concentration of 39.4 g/L was obtained after 48 h with a volumetric productivity of 0.82 g/L h and a product yield of 35.5 g L-lactic acid/100 g biosludges.
Romaní
Aloia
A
Department of Chemical Engineering, Faculty of Science, University of Vigo (Campus Ourense), As Lagoas, 32004 Ourense, Spain.
Yáñez
Remedios
R
Garrote
Gil
G
Alonso
José Luis
JL
D019342:Acetic Acid / Q000032:analysis; D019149:Bioreactors; D001709:Biotechnology / Q000379:methods*; D002482:Cellulose / Q000737:chemistry*; D003470:Culture Media; D005285:Fermentation; D005947:Glucose / Q000032:analysis; D006868:Hydrolysis; D007220:Industrial Waste; D019344:Lactic Acid / Q000032:analysis / Q000737:chemistry*; D008031:Lignin / Q000737:chemistry; D011134:Polysaccharides / Q000737:chemistry; D012722:Sewage; D013997:Time Factors; D014994:Xylose / Q000032:analysis
D003470:Culture Media; D007220:Industrial Waste; D011134:Polysaccharides; D012722:Sewage; D019344:Lactic Acid; D002482:Cellulose; D008031:Lignin; D014994:Xylose; D005947:Glucose; D019342:Acetic Acid