Ethanol production potential from AFEX™ and steam-exploded sugarcane residues for sugarcane biorefineries

Biotechnology for Biofuels
Thapelo MokomeleJohann Görgens

Abstract

Expanding biofuel markets are challenged by the need to meet future biofuel demands and mitigate greenhouse gas emissions, while using domestically available feedstock sustainably. In the context of the sugar industry, exploiting under-utilized cane leaf matter (CLM) in addition to surplus sugarcane bagasse as supplementary feedstock for second-generation ethanol production has the potential to improve bioenergy yields per unit land. In this study, the ethanol yields and processing bottlenecks of ammonia fibre expansion (AFEX™) and steam explosion (StEx) as adopted technologies for pretreating sugarcane bagasse and CLM were experimentally measured and compared for the first time. Ethanol yields between 249 and 256 kg Mg-1 raw dry biomass (RDM) were obtained with AFEX™-pretreated sugarcane bagasse and CLM after high solids loading enzymatic hydrolysis and fermentation. In contrast, StEx-pretreated sugarcane bagasse and CLM resulted in substantially lower ethanol yields that ranged between 162 and 203 kg Mg-1 RDM. The ethanol yields from StEx-treated sugarcane residues were limited by the aggregated effect of sugar degradation during pretreatment, enzyme inhibition during enzymatic hydrolysis and microbial inhibition of S. cerevi...Continue Reading

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Citations

May 14, 2019·Biotechnology for Biofuels·Wagner Rodrigo de SouzaHugo Bruno Correa Molinari
Apr 5, 2021·Bioresource Technology·Kunwar ParitoshVivekanand Vivekanand

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Software Mentioned

Minitab
StEx

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