Comparison of One-Stage Batch and Fed-Batch Enzymatic Hydrolysis of Pretreated Hardwood for the Production of Biosugar
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Fed-batch method has shown a great promise in debottlenecking the high-solid enzymatic hydrolysis for the commercialization of cellulosic biosugar conversion for biofuel/biochemical production. To further improve enzymatic hydrolysis efficiency at high solid loading, fed-batch methods of green liquor-pretreated hardwood were performed to evaluate their effects on sugar recovery by comparing with one-stage batch method in this study. Among all the explored conditions, the fed-batch at 15% consistency gave higher sugar recovery on green liquor-pretreated hardwood compared to that of one-stage batch. By using general linear model analysis, the percentage of enzymatic sugar recovery in fed-batch consistency method (increasing consistency from the initial 10.7 to 15% at intervals of 24 and 48 h) was higher than that of batch hydrolysis at higher density of 15% consistency. Under that best fed-batch condition, the total sugar recovery of pretreated hardwood in enzymatic hydrolysate reached approximately 48.41% at Cellic® enzyme loading of 5 filter-paper unit (FPU)/g and 58.83% at Cellic® enzyme loading of 10 FPU/g with a hydrolysis time of 96 h.
KeywordsHardwood Pretreatment Fed-batch methods Enzymatic hydrolysis Sugar recovery
The authors would like to thank Dr. Dhana Savithri in the Integrated Biomass Research Initiative Laboratory of North Carolina State University for her help on the statistical analysis.
This work was funded by the Wood-to-Ethanol Research Consortium (WERC) of which the members include International Paper, Andritz, VTT, Nalco, Shell, Genencor, Eastman Chemical, and Air Liquide.
Compliance with Ethical Standards
Conflict of Interest
The authors declare that they have no conflict of interest.
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