Second Generation Bioethanol Production: On the Use of Pulp and Paper Industry Wastes as Feedstock

Branco, Rita H. R.; Serafim, Luísa S.; Xavier, Ana M. R. B.

doi:10.3390/fermentation5010004

Cited by 136 publications

(124 citation statements)

References 188 publications

(296 reference statements)

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“…The release of enzymatic and fermentation inhibitors during pretreatment is another limitation [9].Pulp and paper mills have the infrastructures and logistics to handle LCB, and chemical mills employ technology required for LCB fractionation and conversion [10]. Bioethanol has been produced from different feedstocks such as Kraft pulp, spent sulfite liquor, and pulp and paper sludge [11]. Chemical pulping processes can be considered as a LCB pretreatment since they promote delignification and target hemicelluloses to some degree [12].…”

mentioning

confidence: 99%

Ethanol Production from Hydrolyzed Kraft Pulp by Mono- and Co-Cultures of Yeasts: The Challenge of C6 and C5 Sugars Consumption

et al. 2020

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Second-generation bioethanol production's main bottleneck is the need for a costly and technically difficult pretreatment due to the recalcitrance of lignocellulosic biomass (LCB). Chemical pulping can be considered as a LCB pretreatment since it removes lignin and targets hemicelluloses to some extent. Chemical pulps could be used to produce ethanol. The present study aimed to investigate the batch ethanol production from unbleached Kraft pulp of Eucalyptus globulus by separate hydrolysis and fermentation (SHF). Enzymatic hydrolysis of the pulp resulted in a glucose yield of 96.1 ± 3.6% and a xylose yield of 94.0 ± 7.1%. In an Erlenmeyer flask, fermentation of the hydrolysate using Saccharomyces cerevisiae showed better results than Scheffersomyces stipitis. At both the Erlenmeyer flask and bioreactor scale, co-cultures of S. cerevisiae and S. stipitis did not show significant improvements in the fermentation performance. The best result was provided by S. cerevisiae alone in a bioreactor, which fermented the Kraft pulp hydrolysate with an ethanol yield of 0.433 g·g −1 and a volumetric ethanol productivity of 0.733 g·L −1 ·h −1 , and a maximum ethanol concentration of 19.24 g·L −1 was attained. Bioethanol production using the SHF of unbleached Kraft pulp of E. globulus provides a high yield and productivity.Energies 2020, 13, 744 2 of 15 sustainability, has a low and stable price, and practically does not demand extra land [6,7]. There are some facilities producing 2G bioethanol on a commercial scale. However, large-scale production still faces some technological barriers that must be overcome in order to achieve a cost-competitive production [8]. Due to the recalcitrance of LCB, a costly pretreatment step is required, which is the main technological bottleneck of 2G bioethanol production. The release of enzymatic and fermentation inhibitors during pretreatment is another limitation [9].Pulp and paper mills have the infrastructures and logistics to handle LCB, and chemical mills employ technology required for LCB fractionation and conversion [10]. Bioethanol has been produced from different feedstocks such as Kraft pulp, spent sulfite liquor, and pulp and paper sludge [11]. Chemical pulping processes can be considered as a LCB pretreatment since they promote delignification and target hemicelluloses to some degree [12]. Chemical pulping represents about 77% of the virgin pulps produced globally, and more than 95% of these chemical pulps are Kraft pulps [13]. These pulps are produced by Kraft pulping involving the reaction of white liquor, i.e., an alkaline aqueous solution of sodium hydroxide and sodium sulfide with a pH of 14, with lignin at high temperature (150-170 • C). This reaction promotes lignin breakdown and degradation with the release of phenolic fragments, removing almost 90% of the lignin from the wood. Kraft pulping also leads to hemicelluloses and some cellulose loss and decreases the degree of polymerization of cellulose [14]. The utilization of Kraft pulping as a pretreatment method for LCB has ...

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Ethanol Production from Hydrolyzed Kraft Pulp by Mono- and Co-Cultures of Yeasts: The Challenge of C6 and C5 Sugars Consumption

et al. 2020

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“…Although there is no exact data on the accessibility of agricultural waste, the amount could be estimated using the ratio between crop and residual production whereby 10 tons of corn grain produced (with 15% moisture content) could generate 8.5 tons of dried corn stover . As there is no rivalry for land, bioethanol production from agricultural waste should have a minimal impact on the rise of food price …”

Section: Prospective Of Secondary Bioethanol Productionmentioning

confidence: 99%

“…24 As there is no rivalry for land, bioethanol production from agricultural waste should have a minimal impact on the rise of food price. 7 Besides, a convincing adaptability of cellulosic ethanol as an additive to fuel could be justified with octane rating. It was reported that 25-40% of ethanol blended gasoline could boost the octane number and eventually increase the efficiency of engine.…”

Section: Prospective Of Secondary Bioethanol Productionmentioning

confidence: 99%

“…Furthermore, with a reduction in gasoline content, the E85 mixture will be less hazardous and less flammable, hence the ignition of fuel would be in control . Apart from transportation aid, bioethanol can also function as antifreeze, feedstock for chemical derivative, germicide as well as industrial solvent …”

Section: Introductionmentioning

confidence: 99%

“…5 Apart from transportation aid, bioethanol can also function as antifreeze, feedstock for chemical derivative, germicide as well as industrial solvent. 6,7 The ability of meeting the energy demand without the emission of green house is the most promising feature of bioethanol to act as a replacement source of fossil fuel. 4 Furthermore, unlike diesel fuel or gasoline, bioethanol's innate property of retaining high oxygen content makes it a reliable source of clean and renewable energy.…”

Section: Introductionmentioning

confidence: 99%

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Recently, the production of bioethanol is shifted to secondary bioethanol which is produced from nonedible lignocellulosic feedstock to avoid the food versus fuel issue. Mango leaves, a kind of nonedible lignocellulosic material (LCM) that possess a relatively 80.7% of holocellulose (inclusive of cellulose and hemicellulose), appear to be potential candidate to serve as cheap substrate source for bioethanol production. Hence, the objective of this article is to present the current scenario and the potential of mango leaves as a substrate source for bioethanol production. This article also provides an overview on various process parameters such as temperature, pH, substrate concentration, and incubation time that required to be optimized for an efficient fermentation process in the bioethanol production from LCM. Apart from that, several integrated fermentation technologies in bioethanol production which include separate hydrolysis and fermentation, simultaneous saccharification and fermentation, simultaneous saccharification and co‐fermentation, and consolidated bioprocessing will also be discussed in this article. Based on the findings, it is clear that mango leaves have the potential to serve as feedstock for bioethanol production.

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Polyethylene furanoate (PEF) is a biobased plastic, similar to synthetic polyethylene terephthalate (PET), which is produced from the platform chemical 2,5‐hydroxymethylfurfural (HMF). Much of the literature surrounding PEF is focused on unit processes, with little regard for their sustainability and economic viability. In this comprehensive critical review, the entire process of PEF production, from the feedstock to polymerization and upstream applications, is critically examined. Identification of individual pathways capable of producing PEF efficiently and with favorable properties while considering economic viability and environmental sustainability are presented. For each unit operation, recent technological developments are summarized, and recommendations are made based on process efficiency. The collection of the findings from both life cycle assessments (LCA) and techno‐economic analyses (TEA) facilitated the identification of pathways with the greatest potential for environmental sustainability and economic viability of PEF production.

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Second Generation Bioethanol Production: On the Use of Pulp and Paper Industry Wastes as Feedstock

Cited by 136 publications

References 188 publications

Ethanol Production from Hydrolyzed Kraft Pulp by Mono- and Co-Cultures of Yeasts: The Challenge of C6 and C5 Sugars Consumption

Ethanol Production from Hydrolyzed Kraft Pulp by Mono- and Co-Cultures of Yeasts: The Challenge of C6 and C5 Sugars Consumption

Evolution toward the utilization of mango leaves as lignocellulosic material in bioethanol production: A review of process parameter and integrated technologies

Biobased Polyethylene Furanoate: Production Processes, Sustainability, and Techno‐Economics

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