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

Mariana S. T. Amândio, Jorge M. S. Rocha, Luísa S. Serafim and Ana M. R. B. Xavier
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Mariana S. T. Amândio: Chemistry Department, CICECO—Aveiro Institute of Materials, University of Aveiro, Campus Universitário de Santiago, 3810-193 Aveiro, Portugal
Jorge M. S. Rocha: CIEPQPF, Department of Chemical Engineering, Faculty of Sciences and Technology, University of Coimbra, 3030-790 Coimbra, Portugal
Luísa S. Serafim: Chemistry Department, CICECO—Aveiro Institute of Materials, University of Aveiro, Campus Universitário de Santiago, 3810-193 Aveiro, Portugal
Ana M. R. B. Xavier: Chemistry Department, CICECO—Aveiro Institute of Materials, University of Aveiro, Campus Universitário de Santiago, 3810-193 Aveiro, Portugal

Energies, 2021, vol. 14, issue 8, 1-18

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·L −1 of cellulosic sugars. S. cerevisiae and Ethanol Red ® 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 ® . However, bioethanol production was not improved. The best fermentation performance was achieved by Ethanol Red ® , which provided a maximum ethanol concentration near 50 g·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.

Keywords: bioethanol; cellulosic sugars; enzymatic hydrolysis; eucalyptus bark; hydrolysate; kraft pulp (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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