Lignocellulosic bioethanol production: prospects of emerging membrane technologies to improve the process – a critical review

Abstract

<jats:title>Abstract</jats:title><jats:p>To meet the worldwide rapid growth of industrialization and population, the demand for the production of bioethanol as an alternative green biofuel is gaining significant prominence. The bioethanol production process is still considered one of the largest energy-consuming processes and is challenging due to the limited effectiveness of conventional pretreatment processes, saccharification processes, and extreme use of electricity in common fermentation and purification processes. Thus, it became necessary to improve the bioethanol production process through reduced energy requirements. Membrane-based separation technologies have already gained attention due to their reduced energy requirements, investment in lower labor costs, lower space requirements, and wide flexibility in operations. For the selective conversion of biomasses to bioethanol, membrane bioreactors are specifically well suited. Advanced membrane-integrated processes can effectively contribute to different stages of bioethanol production processes, including enzymatic saccharification, concentrating feed solutions for fermentation, improving pretreatment processes, and finally purification processes. Advanced membrane-integrated simultaneous saccharification, filtration, and fermentation strategies consisting of ultrafiltration-based enzyme recycle system with nanofiltration-based high-density cell recycle fermentation system or the combination of high-density cell recycle fermentation system with membrane pervaporation or distillation can definitely contribute to the development of the most efficient and economically sustainable second-generation bioethanol production process.</jats:p>

Analysis of the product streams obtained on butanosolv pretreatment of draff

“…The relevance of this work can be specifically appreciated in light of emerging technologies such as membrane processes that could be incorporated from the initial pretreatment step to the final solvent recovery. [58] This study highlights the potential of butanosolv pretreatments for the fractionation of draff prior to enzymatic and microbial processing, for example ABE fermentation, paving the way to a viable circular economy. [26,38,40] and are colour coded corresponding to the assigned structural element.…”

Analysis of the product streams obtained on butanosolv pretreatment of draff

“…The relevance of this work can be specifically appreciated in light of emerging technologies such as membrane processes that could be incorporated from the initial pretreatment step to the final solvent recovery. [58] This study highlights the potential of butanosolv pretreatments for the fractionation of draff prior to enzymatic and microbial processing, for example ABE fermentation, paving the way to a viable circular economy. [26,38,40] and are colour coded corresponding to the assigned structural element.…”

Cost analysis of subcritical water pretreatment of sugarcane straw and bagasse for second‐generation bioethanol production: a case study in a sugarcane mill

“…2 Also, the use of emerging technologies can contribute to the development of the most efficient and economically sustainable secondgeneration bioethanol production processes. 38,39 Therefore, the use of different fermentation strategies for bioethanol production can be considered a prospect to increase the yield of fuel in a biorefinery and make a sustainable transition for advanced processes with low emission of pollutant gases. 40,41…”

Bioethanol Production from Cellulose-Rich Corncob Residue by the Thermotolerant Saccharomyces cerevisiae TC-5

“…Another aspect for ethanol production is the minimization of the overall process time. Conventional SHF is considered a time-consuming process [ 57 ]. In this study, the overall process time of the up-scaled ethanol production, using thermotolerant S. cerevisiae TC-5, via SSF was only 144 h. In this sense, the newly isolated S. cerevisiae TC-5 might be an effective thermotolerant yeast strain suitable for bioethanol production from lignocellulosic material, minimizing processing time, and production costs.…”

Analysis of the product streams obtained on butanosolv pretreatment of draff

“…The relevance of this work can be specifically appreciated in light of emerging technologies such as membrane processes that could be incorporated from the initial pretreatment step to the final solvent recovery. [58] This study highlights the potential of butanosolv pretreatments for the fractionation of draff prior to enzymatic and microbial processing, for example ABE fermentation, paving the way to a viable circular economy. [26,38,40] and are colour coded corresponding to the assigned structural element.…”

Cost analysis of subcritical water pretreatment of sugarcane straw and bagasse for second‐generation bioethanol production: a case study in a sugarcane mill

“…2 Also, the use of emerging technologies can contribute to the development of the most efficient and economically sustainable secondgeneration bioethanol production processes. 38,39 Therefore, the use of different fermentation strategies for bioethanol production can be considered a prospect to increase the yield of fuel in a biorefinery and make a sustainable transition for advanced processes with low emission of pollutant gases. 40,41…”

Bioethanol Production from Cellulose-Rich Corncob Residue by the Thermotolerant Saccharomyces cerevisiae TC-5

“…Another aspect for ethanol production is the minimization of the overall process time. Conventional SHF is considered a time-consuming process [ 57 ]. In this study, the overall process time of the up-scaled ethanol production, using thermotolerant S. cerevisiae TC-5, via SSF was only 144 h. In this sense, the newly isolated S. cerevisiae TC-5 might be an effective thermotolerant yeast strain suitable for bioethanol production from lignocellulosic material, minimizing processing time, and production costs.…”

Analysis of the product streams obtained on butanosolv pretreatment of draff

“…The relevance of this work can be specifically appreciated in light of emerging technologies such as membrane processes that could be incorporated from the initial pretreatment step to the final solvent recovery. [58] This study highlights the potential of butanosolv pretreatments for the fractionation of draff prior to enzymatic and microbial processing, for example ABE fermentation, paving the way to a viable circular economy. [26,38,40] and are colour coded corresponding to the assigned structural element.…”

Cost analysis of subcritical water pretreatment of sugarcane straw and bagasse for second‐generation bioethanol production: a case study in a sugarcane mill

“…2 Also, the use of emerging technologies can contribute to the development of the most efficient and economically sustainable secondgeneration bioethanol production processes. 38,39 Therefore, the use of different fermentation strategies for bioethanol production can be considered a prospect to increase the yield of fuel in a biorefinery and make a sustainable transition for advanced processes with low emission of pollutant gases. 40,41…”

Bioethanol Production from Cellulose-Rich Corncob Residue by the Thermotolerant Saccharomyces cerevisiae TC-5

“…Another aspect for ethanol production is the minimization of the overall process time. Conventional SHF is considered a time-consuming process [ 57 ]. In this study, the overall process time of the up-scaled ethanol production, using thermotolerant S. cerevisiae TC-5, via SSF was only 144 h. In this sense, the newly isolated S. cerevisiae TC-5 might be an effective thermotolerant yeast strain suitable for bioethanol production from lignocellulosic material, minimizing processing time, and production costs.…”