Cellulosic Ethanol: Improving Cost Efficiency by Coupling Semi-Continuous Fermentation and Simultaneous Saccharification Strategies

Barahona, Patricia Portero; Mayorga, Bernardo Bastidas; Martín‐Gil, Jesús; Martín-Ramos, Pablo; Barriga, Enrique Javier Carvajal

doi:10.3390/pr8111459

Cited by 18 publications

(4 citation statements)

References 60 publications

(57 reference statements)

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“…The combination of the semicontinuous fermentation of sugarcane bagasse and SSF system produces 9.07% (v/v) ethanol with <1% residual glucose at the optimum conditions of 1% (w/v) NaOH, 160 • C, and 20 min of reaction. This study shows no remarkable variation throughout the whole process and that the system achieves a constant state [167]. Compared with SHF, SSF has several advantages.…”

Section: Ethanol Synthesis Based On Fermentationmentioning

confidence: 66%

Recent Advances in the Technologies and Catalytic Processes of Ethanol Production

et al. 2023

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On the basis of its properties, ethanol has been identified as the most used biofuel because of its remarkable contribution in reducing emissions of carbon dioxide which are the source of greenhouse gas and prompt climate change or global warming worldwide. The use of ethanol as a new source of biofuel reduces the dependence on conventional gasoline, thus showing a decreasing pattern of production every year. This article contains an updated overview of recent developments in the new technologies and operations in ethanol production, such as the hydration of ethylene, biomass residue, lignocellulosic materials, fermentation, electrochemical reduction, dimethyl ether, reverse water gas shift, and catalytic hydrogenation reaction. An improvement in the catalytic hydrogenation of CO2 into ethanol needs extensive research to address the properties that need modification, such as physical, catalytic, and chemical upgrading. Overall, this assessment provides basic suggestions for improving ethanol synthesis as a source of renewable energy in the future.

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Section: Ethanol Synthesis Based On Fermentationmentioning

confidence: 66%

Recent Advances in the Technologies and Catalytic Processes of Ethanol Production

et al. 2023

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“…A hydrogen peroxide-accelerated paper-mill sludge showed a 95% theoretical conversion yield of ethanol and higher ethanol productivity in 9 h fermentation time [30]. The sugars derived from the hydrolysis of alkali-pretreated sugarcane bagasse with Cellic CTec2 (6 FPU/g cellulose) and fermented with S. cerevisiae resulted in an ethanol The sugars derived from the hydrolysis of alkali-pretreated sugarcane bagasse with Cellic CTec2 (6 FPU/g cellulose) and fermented with S. cerevisiae resulted in an ethanol production of 9.07 g/L, with a theoretical yield of 97.92 to 99.85% [64]. Waste-paper hydrolysate showed the highest ethanol production (0.54 g/L/h) with a fermentation conversion efficiency of 90.8% [65].…”

Section: Ethanol Fermentationmentioning

confidence: 99%

Box–Behnken Design-Based Optimization of the Saccharification of Primary Paper-Mill Sludge as a Renewable Raw Material for Bioethanol Production

et al. 2023

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In this study, the primary paper-mill sludge characterized as containing 51% glucan was used to optimize the enzymatic saccharification process for the production of bioethanol using a Box–Behnken design (BBD). Polyethylene glycol 4000 (PEG-4000) surfactant-assisted enzymatic saccharification of dried primary sludge (DPS) showed a 12.8% improvement in saccharification efficiency. There was a statistically significant effect of solid enzyme loading and saccharification time on the enzymatic saccharification of DPS at a 95% confidence level (p < 0.05). The optimum levels of 10.4% w/w DPS solid loading, 2.03% enzyme loading (10 FPU g/DPS), and 1% (w/w DPS) PEG-4000 loading for a saccharification efficiency of 57.66% were validated experimentally and found to be non-significant with regard to the lack of fit with the predicted saccharification efficiency of 56.76%. Furthermore, Saccharomyces cerevisiae fermented the saccharified sugars into ethanol (9.35 g/L) with a sugar-to-ethanol conversion yield of 91.6% compared with the theoretical maximum. Therefore, DPS is a more suitable renewable biomass for determining the presence of fermentable sugar and for the production of ethanol.

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“…It is used mainly in the industrial production of biofuels such as bioethanol and biobased chemicals due to its low economic value and high availability (Vassilev et al, 2013). The leftovers and/or waste obtained from agriculture and industry, such as sugarcane bagasse (SCB), corn stover, wheat and rice straw, and wood chips, can be regarded as suitable lignocellulosic materials for bioethanol production (Barahona et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

“…Sugarcane bagasse, which is 25-30% of the total weight of crushed cane, is a fibrous residue composed of cellulose (35.2-50%), hemicellulose (17-38%) and lignin (19-33%), which remains in a sugarcane mill after crushing the sugarcane stalk and extracting its juice (Móczó et al, 2020;Barahona et al, 2020). It is mainly used as a burning raw material (85%) in sugarcane mill furnaces (for cogeneration), whereas the excess or surplus bagasse left is deposited on empty fields, altering the landscape (Birru, 2016).…”

Section: Introductionmentioning

confidence: 99%

Process optimization for production of bioethanol from sugarcane bagasse at Wonji Sugar Factory, Ethiopian

Debela,

Bekele,

Nemera

2024

Preprint

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The Ethiopian sugar estates produce large amounts of bagasse annually. An alternative bioethanol energy source is produced through pretreatment and valorization processes. Therefore, this study aimed to optimize pretreatment, hydrolysis and fermentation processes to produce bioethanol from sugarcane bagasse. Different concentrations of alkaline (NaOH) and acid (H2SO4) were used to hydrolyse sugarcane bagasse at different pressures and reaction times, while fermentation experiments were carried out at different incubation temperatures and for different periods at different initial pH values. The pretreatment process was used to extract cellulose, hemicellulose and lignin, whereas hydrolysis was used for reducing sugars, and fermentation was used for ethanol. After the quality test, the collected data were subjected to statistical analysis and model optimization using design expert statistical software version 7.0. The results of the statistical analysis on pretreatment optimization revealed that 2.5% NaOH and 15 psi at 35 minutes resulted in the maximum extraction of cellulose (81.25) with the maximum removal of hemicellulose (8.41) and lignin (6.02%). For pretreated bagasse hydrolysis, 2.05% H2SO4 at 205.92°C within 60 minutes produced a maximum yield of reducing sugars (80.89 g/l), while the maximum yield of ethanol produced under optimized conditions (6 initial pH, 30°C and 71.83 hours of incubation) was 42.98 g/l.

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Cellulosic Ethanol: Improving Cost Efficiency by Coupling Semi-Continuous Fermentation and Simultaneous Saccharification Strategies

Cited by 18 publications

References 60 publications

Recent Advances in the Technologies and Catalytic Processes of Ethanol Production

Recent Advances in the Technologies and Catalytic Processes of Ethanol Production

Box–Behnken Design-Based Optimization of the Saccharification of Primary Paper-Mill Sludge as a Renewable Raw Material for Bioethanol Production

Process optimization for production of bioethanol from sugarcane bagasse at Wonji Sugar Factory, Ethiopian

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