resumo
The European Green Deal emerged as a package of policy initiatives for a green transition, aiming to reach climate neutrality by 2050. Accordingly, the pulp and paper industry has been focused on upgrading residues into value-added products within the forest-based circular economy business model. In this context, this study considered the possibility of using bark, a residue available in high volume on factory floors, for cellulosic ethanol production instead of typical burning for energy generation. Bioconversion of lignocellulosic polysaccharides of bark is a challenge and simultaneous saccharification and fermentation (SSF) setup was chosen to boost cellulosic ethanol production. The introduction of a short pre-saccharification (PS) stage (0, 1 and 4 h) in bioethanol production from Eucalyptus globulus bark, previously submitted to a kraft pretreatment, following an integrated configuration, PS-SSF, at the bioreactor scale improved bioethanol concentration. It was observed that the longer pre-saccharification, the higher productivity. Shifting from this batch PS-SSF (4 h) to a fed-batch PSSSF (4 h) configuration allowed to increase the solids loading from 8% to 20% (w/v), raising the final bioethanol concentration from 27.4 to 75.9 g L-1, and improving by itself the overall productivity more than 25%. These results show that in the pulp and paper mills, an integrated biorefinery should be considered to foster the total resources use within the circular economy model.
palavras-chave
BATCH SIMULTANEOUS SACCHARIFICATION; ENZYMATIC-HYDROLYSIS; LIGNOCELLULOSIC BIOMASS; ETHANOL-PRODUCTION; SUGARCANE BAGASSE; PRIMARY SLUDGE; STRATEGIES; ACID; HARDWOOD; DESIGN
categoria
Engineering
autores
Amândio, MST; Rocha, JMS; Xavier, AMRB
nossos autores
Ana Maria Rebelo Barreto Xavier
Professor AuxiliarProjectos
InPaCTus - Innovative Products and Technologies from Eucalyptus Project (InPacTus)
Collaboratory for Emerging Technologies, CoLab (EMERGING TECHNOLOGIES)
CICECO - Aveiro Institute of Materials (UIDB/50011/2020)
CICECO - Aveiro Institute of Materials (UIDP/50011/2020)
Associated Laboratory CICECO-Aveiro Institute of Materials (LA/P/0006/2020)
agradecimentos
This work was carried out under the Project InPaCTus - Innovative Products and Technologies from Eucalyptus. Project N.o 21874 funded by Portugal 2020 through European Regional Development Fund (ERDF) in the frame of COMPETE 2020 no246/AXIS II/2017. This work was developed within the scope of the project CICECO-Aveiro Institute of Materials, UIDB/50011/2020, UIDP/50011/2020 & LA/P/0006/2020, financed by national funds through the FCT/MEC (PIDDAC). Authors would also like to thank the CIEPQPF - Strategic Research Centre Project UIDB/00102/2020. funded by the Fundacao para a Ciencia e Tecnologia (FCT). The authors are thankful to RAIZ - Instituto de Investigacao da Floresta e do Papel for supplying the pretreated Eucalyptus globulus bark and all the equipment required for the enzymatic hydrolysis.