Pretreatment technologies for an efficient bioethanol production process based on enzymatic hydrolysis: A review

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.

/pdf/pretreatment-of-lignocellulosic-wastes-to-improve-ethanol-zbwx58h962.pdf

Pretreatment of lignocellulosic wastes to improve ethanol and biogas production: a review.

Lignocellulosic biomass: a sustainable platform for the production of bio-based chemicals and polymers

http://umu.diva-portal.org/smash/get/diva2:882304/FULLTEXT01

Pretreatment of lignocellulose: Formation of inhibitory by-products and strategies for minimizing their effects

Bioethanol production from agricultural wastes: An overview

This article reviews developments in the technology for ethanol production from lignocellulosic materials by “enzymatic” processes. Several methods of pretreatment of lignocelluloses are discussed, where the crystalline structure of lignocelluloses is opened up, making them more accessible to the cellulase enzymes. The characteristics of these enzymes and important factors in enzymatic hydrolysis of the cellulose and hemicellulose to cellobiose, glucose, and other sugars are discussed. Different strategies are then described for enzymatic hydrolysis and fermentation, including separate enzymatic hydrolysis and fermentation (SHF), simultaneous saccharification and fermentation (SSF), non-isothermal simultaneous saccharification and fermentation (NSSF), simultaneous saccharification and co-fermentation (SSCF), and consolidated bioprocessing (CBP). Furthermore, the by-products in ethanol from lignocellulosic materials, wastewater treatment, commercial status, and energy production and integration are reviewed.

/pdf/acid-based-hydrolysis-processes-for-ethanol-from-5bj47066uh.pdf

Acid-based hydrolysis processes for ethanol from lignocellulosic materials: a review.

A critical review of analytical methods in pretreatment of lignocelluloses: Composition, imaging, and crystallinity.

https://ojs.cnr.ncsu.edu/index.php/BioRes/article/download/BioRes_2_4_707_738_Taherzadeh_Karimi_EnzymeBased_Hydrol_Ethanol_Review/81

Enzymatic-based hydrolysis processes for ethanol

Ethanol production from dilute-acid pretreated rice straw by simultaneous saccharification and fermentation with Mucor indicus, Rhizopus oryzae, and Saccharomyces cerevisiae

Keikhosro Karimi

Papers

Pretreatment of lignocellulosic wastes to improve ethanol and biogas production: a review.

Acid-based hydrolysis processes for ethanol from lignocellulosic materials: a review.

A critical review of analytical methods in pretreatment of lignocelluloses: Composition, imaging, and crystallinity.

Enzymatic-based hydrolysis processes for ethanol

Ethanol production from dilute-acid pretreated rice straw by simultaneous saccharification and fermentation with Mucor indicus, Rhizopus oryzae, and Saccharomyces cerevisiae