Pretreatment of Lignocellulosic Wastes to Improve Ethanol and Biogas Production: A Review

By M. Taherzadeh, K. Karimi. International Journal of Molecular Sciences, 2008

2,663 citations recorded by the source corpus.

Lignocelluloses are often a major or sometimes the sole components of different waste streams from various industries, forestry, agriculture and municipalities. Hydrolysis of these materials is the first step for either digestion to biogas (methane) or fermentation to ethanol. However, enzymatic hydrolysis of lignocelluloses with no pretreatment is usually not so effective because of high stability of the materials to enzymatic or bacterial attacks. The present work is dedicated to reviewing the methods that have been studied for pretreatment of lignocellulosic wastes for conversion to ethanol or biogas. Effective parameters in pretreatment of lignocelluloses, such as crystallinity, accessible surface area, and protection by lignin and hemicellulose are described first. Then, several pretreatment methods are discussed and their effects on improvement in ethanol and/or biogas production are described. They include milling, irradiation, microwave, steam explosion, ammonia fiber explosion (AFEX), supercritical CO2 and its explosion, alkaline hydrolysis, liquid hot-water pretreatment, organosolv processes, wet oxidation, ozonolysis, dilute-and concentrated-acid hydrolyses, and biological pretreatments.

Subfields: Biomedical Engineering, Molecular Biology

View Paper: https://www.semanticscholar.org/paper/711dc5324ab6d95cdd1e4a7ed3f4acd64ce2abec

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Citations in the corpus

Recent updates on different methods of pretreatment of lignocellulosic feedstocks: a review (2017, methodology): “Different milling methods viz. two-roll milling, hammer milling, colloid milling, and vibratory milling are used to improve the digestibility of the lignocellulosic materials (Taherzadeh and Karimi 2008).”
Overview of biomass pretreatment for cellulosic ethanol production. (2009, methodology): “The organic solvents used in the organosolv process include methanol, ethanol, acetone, ethylene glycol, triethylene glycol, tetrahydrofurfuryl alcohol, glycerol, aqueous phenol, aqueous n-butanol([143,145]).”
Lignin: Recent advances and emerging applications (2014, neutral): “[2] Taherzadeh MJ, Karimi Keikhosro K.”
Progress in Physical and Chemical Pretreatment of Lignocellulosic Biomass (2013, methodology): “The following is a list of the desirable pretreatment aspects (da Costa Sousa et al. 2009; Wyman et al. 2005; Yang and Wyman 2008; Taherzadeh and Karimi 2008; Chundawat et al. 2011a):”
Biological pretreatment of lignocelluloses with white-rot fungi and its applications: A review (2011, methodology): “Pretreatment of lignocellulosic biomass can be performed by physical, mechanical, chemical, and biological methods (reviewed by e.g. Mosier 2005; Taherzadeh and Karimi 2008; Hu et al. 2008; Hendriks and Zeeman 2009; Alvira et al. 2010).”
Recent updates on biogas production - a review (2016, background): “Hence, the hydrolysis step is often considered as the rate-limiting step when utilizing these kinds of substrates (Vavilin et al., 1996; Taherzadeh and Karimi, 2008).”
A Review of Xylanase Production by the Fermentation of Xylan: Classification, Characterization and Applications (2013, background): “According to Taherzadech and Karimi [54], ethanol is the most important renewable fuel in terms of volume and market value, and following the fossil fuel crisis, it has been identified as an alternative fuel [48].”
Lignocellulose as raw material in fermentation processes (2010, background): “Lignin is dissolved as a result of the solvent action and the cellulose remains in the residual solid material [4, 9].”
Seaweed Bioethanol Production: A Process Selection Review on Hydrolysis and Fermentation (2018, background): “The low contents of recalcitrant compounds such as lignin in seaweeds, also makes enzymatic hydrolysis of seaweeds with little or no pre-treatment possible [7].”
Improvement of biogas production from pine wood by alkali pretreatment (2013, background): “The final goal of the pretreatment is to decrease the crystallinity of cellulose and eliminate the resistance of lignin; hence, making them more accessible to the bacteria [4].”
A review of wood thermal pretreatments to improve wood composite properties (2013, neutral): “…processes for biomass pretreatment prior to the production of cellulosic ethanol (Mosier et al. 2005a; Öhgren et al. 2007; Carvalheiro et al. 2008; Taherzadeh and Karimi 2008; Hendriks and Zeeman 2009; Alvira et al. 2010; Girio et al. 2010), pretreatment via torrefaction for the production of…”