Extrusion-Biodelignification Approach for Biomass Pretreatment

Delon Konan, Adama Ndao, Ekoun Koffi, Saïd Elkoun, Mathieu Robert, Denis Rodrigue and Kokou Adjallé ()
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Delon Konan: Laboratory of Environmental Biotechnologies, Institut National de la Recherche Scientifique (INRS), Quebec City, QC G1P 4S5, Canada
Adama Ndao: Laboratory of Environmental Biotechnologies, Institut National de la Recherche Scientifique (INRS), Quebec City, QC G1P 4S5, Canada
Ekoun Koffi: Department of Mechanic and Energy Engineering, Institut National Polytechnique Felix Houphouët Boigny (INPHB), Yamoussoukro P.O. Box 1093, Côte d’Ivoire
Saïd Elkoun: Center for Innovation in Technological Ecodesign (CITE), University of Sherbrooke, Sherbrooke, QC J1K 2R1, Canada
Mathieu Robert: Center for Innovation in Technological Ecodesign (CITE), University of Sherbrooke, Sherbrooke, QC J1K 2R1, Canada
Denis Rodrigue: Department of Chemical Engineering, Université Laval, Quebec City, QC G1V 0A6, Canada
Kokou Adjallé: Laboratory of Environmental Biotechnologies, Institut National de la Recherche Scientifique (INRS), Quebec City, QC G1P 4S5, Canada

Waste, 2025, vol. 3, issue 3, 1-27

Abstract: This work presents a new approach for lignocellulosic biomass pretreatment. The process is a sequential combination of extrusion (Ex) and semi-solid fermentation (SSF). To assess the Ex-SSF pretreatment efficiency, black spruce chips (wood residues) and corn stover (crop residues) were subjected to the process. The negative controls were the pretreatment of both residues with SSF alone without extrusion. Lignin peroxidase was the main ligninolytic enzyme contributing to the delignification in the negative controls. High lignin peroxide (LiP) activities were recorded for raw black spruce (53.7 ± 2.7 U/L) and corn stover (16.4 ± 0.8 U/L) compared to the Ex-SSF pretreated biomasses where the highest LiP activity recorded was 6.0 ± 0.3 U/L (corn residues). However, with the negative controls, only a maximum of 17% delignification was achieved for both biomasses. As for the Ex-SSF process, the pretreatments were preceded by the optimization of the extrusion (Ex) step and the semi-solid fermentation (SSF) step via experimental designs. The Ex-SSF pretreatments led to interesting results and offered cost-effective advantages compared to existing pretreatments. Biomass delignification reached 59.1% and 65.4% for black spruce and corn stover, respectively. For the analyses performed, it was found that manganese peroxidase (MnP) was the main contributor to delignification during the SSF step. MnP activity was up to 13.8 U/L for Ex-SSF pretreated black spruce, and 32.0 U/L for Ex-SSF pretreated corn stover, while the maximum MnP recorded in the negative controls was 1.4 ± 0.1 U/L. Ex-SSF pretreatment increased the cellulose crystallinity index (CrI) by 13% for black spruce and 4% for corn stover. But enzymatic digestibility of the Ex-SSF pretreated biomasses with 0.25 mL/g of enzyme led to 7.6 mg/L sugar recovery for black spruce, which is 2.3 times the raw biomass yield. The Ex-SSF pretreated corn stover led to 17.0 mg/L sugar recovery, which is a 44% improvement in sugar concentration compared to raw corn stover. However, increasing the enzyme content from 0.25 mL/g to 0.50 mg/L and 0.75 mg/L generated lower hydrolysis efficiency (the sugar recovery decreased).

Keywords: biodelignification; Phanerochaete chrysosporium; biomass pretreatment; fungi; extrusion; solid fermentation (search for similar items in EconPapers)
JEL-codes: Q1 Q16 Q18 Q2 Q20 Q23 Q24 Q25 Q28 Q3 Q31 Q38 Q5 (search for similar items in EconPapers)
Date: 2025
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