Current challenges and innovative developments in pretreatment of lignocellulosic residues for biofuel production: A review

Beig, Bilal; Riaz, Muhammad; Naqvi, Salman Raza; Hassan, Muhammad; Wang, Dechao; Karimi, Keikhosro; Pugazhendhi, Arivalagan; Atabani, A.E.; Lan, Nguyễn Thúy

doi:10.1016/j.fuel.2020.119670

Cited by 163 publications

(54 citation statements)

References 171 publications

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“…The first are purely physical techniques designed to break down the size of cellulose fibres and degrade lignin and hemicellulose. These techniques include size reduction (chipping, grinding and milling), microwave irradiation, ultrasound and high-pressure homogenisation [ 41 ]. These energy-intensive processes successfully reduce the crystallinity of the cellulose, but are generally not commercially viable options.…”

Section: Lignocellulose As a Carbon Sourcementioning

confidence: 99%

“…A second group of pre-treatments are physio-chemical processes, such as steam explosion and hot liquid water treatment [ 41 ]. Steam explosion treatment is an effective process, leading to the breakage of the fibres, allowing easy access of enzymes to the cellulose for hydrolysis to occur.…”

Section: Lignocellulose As a Carbon Sourcementioning

confidence: 99%

“…However, hemicellulose transformation is incomplete, and toxic compounds are released. Chemical treatments with acids [ 52 ], alkalis [ 53 ], oxidation agents, biological solvents [ 54 ] and aqueous–organic solvents have also been devised with mixed success [ 41 ]. They often successfully remove lignin with low inhibitor release, but suffer from high reagent costs and the need for corrosion resistance in scaled equipment.…”

Section: Lignocellulose As a Carbon Sourcementioning

confidence: 99%

“…The utilisation of this waste in synthetic biology applications could add commercial value to the waste and provide a carbon neutral source of fuels and other high value compounds. However, existing commercial microbial fermentations utilising lignocellulose waste as a carbon source rely on the release of the abundant recalcitrant sugars (e.g., glucose) via expensive pre-treatment strategies [ 41 ].…”

Section: Introductionmentioning

confidence: 99%

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Consolidated Bioprocessing: Synthetic Biology Routes to Fuels and Fine Chemicals

2021

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The long road from emerging biotechnologies to commercial “green” biosynthetic routes for chemical production relies in part on efficient microbial use of sustainable and renewable waste biomass feedstocks. One solution is to apply the consolidated bioprocessing approach, whereby microorganisms convert lignocellulose waste into advanced fuels and other chemicals. As lignocellulose is a highly complex network of polymers, enzymatic degradation or “saccharification” requires a range of cellulolytic enzymes acting synergistically to release the abundant sugars contained within. Complications arise from the need for extracellular localisation of cellulolytic enzymes, whether they be free or cell-associated. This review highlights the current progress in the consolidated bioprocessing approach, whereby microbial chassis are engineered to grow on lignocellulose as sole carbon sources whilst generating commercially useful chemicals. Future perspectives in the emerging biofoundry approach with bacterial hosts are discussed, where solutions to existing bottlenecks could potentially be overcome though the application of high throughput and iterative Design-Build-Test-Learn methodologies. These rapid automated pathway building infrastructures could be adapted for addressing the challenges of increasing cellulolytic capabilities of microorganisms to commercially viable levels.

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Section: Lignocellulose As a Carbon Sourcementioning

confidence: 99%

Section: Lignocellulose As a Carbon Sourcementioning

confidence: 99%

Section: Lignocellulose As a Carbon Sourcementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Consolidated Bioprocessing: Synthetic Biology Routes to Fuels and Fine Chemicals

2021

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“…In Brazil, net greenhouse gases emission was estimated to be reduced by 25.8 million tons CO 2 equivalent in 2007. This was only because of the replacement of non-renewable energy sources with renewable energy sources [31].…”

Section: Sugarcane a Bioenergy Source: An Overviewmentioning

confidence: 99%

Sugarcane as Future Bioenergy Crop: Potential Genetic and Genomic Approaches

Khan¹,

Mustafa²,

Joyia³

et al. 2021

Sugarcane - Biotechnology for Biofuels

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Biofuels are gaining increased scientific as well as public attention to fulfill future energy demands and can be the only potential candidates to safeguard and strengthen energy security by reducing the world’s reliance on exhausting fossil energy sources. Sugarcane is an important C4 crop with great potential to contribute to global biofuel production as sugarcane juice can be easily fermented to produce ethanol. The success of bioethanol production from sugarcane in Brazil has widened the scope of the technology and has led to increased demand of purpose-grown sugarcane for biofuel production. Scientific interventions have not only helped to improve the cane crop but industrial procedures have also been upgraded resulting in improved production of bioethanol. Likewise, advancements in omics have led to high hopes for the development of energy cane. This chapter highlights the advancements as well as potential and challenges in the production of sugarcane biofuel, focusing on genetic and genomic interventions improving the crop as energy-cane. Further, controversies in the production and usage of biofuel derived from sugarcane have also been discussed.

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Generation of Sustainable Energy from Agro‐Residues through Thermal Pretreatment for Developing Nations: A Review

Ibitoye

Jen

Mahamood

et al. 2021

Adv Energy and Sustain Res

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Energy is a prerequisite for any nation's industrial, social, and economic advancements. [1][2][3][4] Energy can broadly be categorized into renewable and nonrenewable energies. Nonrenewable energies are energy that cannot be replenished over a short period. Examples of such energy are coal, nuclear energy, natural gas, and crude oil. Renewable energies, in contrast, are those energies that are replenishable over a short period. This form of energy includes solar, hydro, tidal, wind, biomass energy, etc. Biomass energy is the energy generated from biomass materials. Biomass material could be woody (such as teak, mahogany), nonwoody (such as agro-residues, industrial waste), and animal materials. [5] Agroresidues are described as all organic materials that are generated as byproducts from agricultural activities. These byproducts constitute the main part of biomass feedstock's total annual production, which forms an essential and sustainable source of energy for industrial and domestic applications. [6] They are material that are of benefit to humankind, though their economic benefits are less than the cost of transformation for advantageous use. [7] Agro-residues can be divided into residues generated on the field and residues generated during the processing of agricultural products. [8] Field-based residues include but are not limited to tobacco stalks, maize stalks, sugar cane tops, rice straw, soybean straw/pods, and cocoa pods. In contrast, process-based include peanuts shell, rice husk, maize cob, bagasse, and coffee husk. Agro-residues are available in large quantities in an area with a high level of agricultural activities. [9] In developing nations, major agricultural activities are recorded in the rural areas, resulting in a larger quantity of agro-residues in these areas. [10,11] Most of the time, the farmers in developing nations' dump these residues in an open field or

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Current challenges and innovative developments in pretreatment of lignocellulosic residues for biofuel production: A review

Cited by 163 publications

References 171 publications

Consolidated Bioprocessing: Synthetic Biology Routes to Fuels and Fine Chemicals

Consolidated Bioprocessing: Synthetic Biology Routes to Fuels and Fine Chemicals

Sugarcane as Future Bioenergy Crop: Potential Genetic and Genomic Approaches

Generation of Sustainable Energy from Agro‐Residues through Thermal Pretreatment for Developing Nations: A Review

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