Cellulosic Bioethanol from Industrial Eucalyptus globulus Bark Residues Using Kraft Pulping as a Pretreatment

authors	Amandio, MST; Rocha, JMS; Serafim, LS; Xavier, AMRB
nationality	International
journal	ENERGIES
author keywords	bioethanol; cellulosic sugars; enzymatic hydrolysis; eucalyptus bark; hydrolysate; kraft pulp
keywords	2ND-GENERATION ETHANOL-PRODUCTION; SPATHASPORA-PASSALIDARUM; LIGNOCELLULOSIC BIOMASS; SIMULTANEOUS SACCHARIFICATION; ENZYMATIC-HYDROLYSIS; FERMENTATION; XYLOSE; BATCH; BIOREFINERY; STRATEGIES
abstract	The pulp and paper industry faces an emerging challenge for valorising wastes and side-streams generated according to the biorefinery concept. Eucalyptus globulus bark, an abundant industrial residue in the Portuguese pulp and paper sector, has a high potential to be converted into biobased products instead of being burned. This work aimed to evaluate the ethanol production from E. globulus bark previously submitted to kraft pulping through separate hydrolysis and fermentation (SHF) configuration. Fed-batch enzymatic hydrolysis provided a concentrated hydrolysate with 161.6 g center dot L-1 of cellulosic sugars. S. cerevisiae and Ethanol Red(R) strains demonstrated a very good fermentation performance, despite a negligible xylose consumption. S. passalidarum, a yeast known for its capability to consume pentoses, was studied in a simultaneous co-culture with Ethanol Red(R). However, bioethanol production was not improved. The best fermentation performance was achieved by Ethanol Red(R), which provided a maximum ethanol concentration near 50 g center dot L-1 and fermentation efficiency of 80%. Concluding, kraft pulp from E. globulus bark showed a high potential to be converted into cellulosic bioethanol, being susceptible to implementing an integrated biorefinery on the pulp and paper industrial plants.
publisher	MDPI
isbn	1996-1073
year published	2021
volume	14
issue	8
digital object identifier (doi)	10.3390/en14082185
web of science category	18
subject category	Energy & Fuels
unique article identifier	WOS:000644150100001