SSF production of lactic acid from cellulosic biosludges

详细信息    查看全文

• 作者：Aloia Romaní ; Remedios Yá ; ñ ; ez ; Gil Garrote ; José ; Luis Alonso
• 关键词：Simultaneous saccharification and fermentation ; Lactic acid ; Biosludges ; Industrial solid wastes ; Low-cost medium
• 刊名：Bioresource Technology
• 出版年：2008
• 出版时间：July 2008
• 年：2008
• 卷：99
• 期：10
• 页码：4247-4254
• 全文大小：161 K

文摘

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 LSR₀ = 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.