Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7065959 | Bioresource Technology | 2018 | 41 Pages |
Abstract
To improve sugar recovery and ethanol production from wheat straw, a sequential two-stage pretreatment process combining alkaline pre-extraction and acid catalyzed steam treatment was investigated. The results showed that alkaline pre-extraction using 8% (w/w) sodium hydroxide at 80â¯Â°C for 90â¯min followed by steam pretreatment with 3% (w/w) sulfur dioxide at 151â¯Â°C for 16â¯min was sufficient to prepare a substrate that could be efficiently hydrolyzed at high solid loadings. Moreover, alkaline pre-extraction reduced the process severity of steam pretreatment and decreased the generation of inhibitory compounds. During enzymatic hydrolysis, increasing solid loading decreased the yield of monomeric sugars. Enzymatic hydrolysis at 25% (w/v) solid loading, the yields of approximately 80% of glucose and 65% of xylose could be reached with an enzyme dosage of 25â¯mg protein/g glucan. Following fermentation of hydrolysate with sugar concentration of approximately 120â¯g/L, an ethanol concentration of 54.5â¯g/L was achieved.
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Process Chemistry and Technology
Authors
Zhaoyang Yuan, Guodong Li, Eric L. Hegg,