Biobutanol production from brewer’s spent grain hydrolysates by Clostridium beijerinckii

Plaza, Pedro E.; Gallego, Luis J.; Vásquez, Mariana Peñuela; Lucas, Susana; Cubero, Marı́a Teresa Garcı́a; Coca, Mónica

doi:10.1016/j.biortech.2017.07.139

Cited by 85 publications

(46 citation statements)

References 41 publications

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“…This has also been observed, but at lower expression, in previous studies, where glucooligosaccharide extraction was approximately 3-fold lower with higher autohydrolysis temperature [41]. Moreover, glucan recovery observed here was similar to that obtained by others using acid hydrolysis [42].…”

Section: Evaluation Of Autohydrolysis Treatmentsupporting

confidence: 91%

Intensifying ethanol production from brewer’s spent grain waste: Use of whole slurry at high solid loadings

et al. 2019

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This work targets the valorization of brewer's spent grain (BSG) waste by ethanol production, providing strategies for increasing titers in the multiple process steps involved. High solid loadings and use of whole slurry from the pretreatment were evaluated, aiming to achieve high ethanol concentration and yield. As variability in BSG chemical composition presents a challenge for their valorization, six different BSGs were chemically characterized, which allowed the selection of two with high polysaccharide content. High solid loadings (up to 25%) were employed for the pretreatment of selected BSGs by autohydrolysis, an environmentally friendly process, to improve enzymatic saccharification and extract fermentable sugars as oligosaccharides and monosaccharides. As a result, high glucose concentrations (43.7 and 57.7 g L −1) and glucose yield (85.9 and 70.6%) were obtained from the saccharification of the pretreated BSG whole slurry at 20 and 25% solid loading, respectively. Whole slurries from autohydrolysis were used as substrate for ethanol production by hybrid saccharification and fermentation. Two different Saccharomyces cerevisiae strains were evaluated and high ethanol concentration (42.27 g L −1) at a high yield (94.0%) was achieved. The results attained by the combined intensification approaches qualify BSG waste as a valuable renewable resource for cost-effective ethanol production.

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Section: Evaluation Of Autohydrolysis Treatmentsupporting

confidence: 91%

Intensifying ethanol production from brewer’s spent grain waste: Use of whole slurry at high solid loadings

et al. 2019

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“…Table 1 shows the BSG composition that contained mainly 24.49 ± 0.91% w/w hemicellulose, 20.86 ± 0.60% w/w cellulose, 23.05% w/w protein and 9.62% lignin. The composition of BSG used in this study was similar with those previously reported [25][26][27][28]. These compositions may be varied related to the species of barley, collecting time, malting and mashing condition and the quality and type of engine used in the brewing production process [6,29,30].…”

Section: Methodssupporting

confidence: 81%

“…The total nitrogen increased with increasing BSG loading up to 24% while the concentration of total sugar increased up to the maximum level of 33.76 ± 0.67 g/L when using BSG loading at 15%. The use of high solid loading is attractive because it enables a high concentration of hydrolyzed products obtained [28]. However, a higher BSG loading of 24% gave a lower total sugar of 28.10 ± 0.45 g/L.…”

Section: Methodsmentioning

confidence: 99%

Acid Hydrolysis of Brewers’ Industrial Wastes and Their Use for Lipid Production by Oleaginous Yeasts

Sae-ngae

Cheirsilp

Suksaroj

et al. 2019

J. of Wat. & Envir. Tech.

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Brewers' spent grain (BSG) and spent yeast cell (SYC) are the wastes from mashing and fermentation process of beer. The compositions of BSG were 24.49 ± 0.91% hemicellulose, 20.86 ± 0.60% cellulose and 9.62 ± 0.40% lignin, while those of SYC were 46.97 ± 0.07% protein, 21.32 ± 0.08% carbohydrate and 5.73 ± 0.57% lipids. BSG and SYC were acid hydrolyzed using different solid loadings at 5-24%. The optimal solid loadings for BSG and SYC that gave maximum sugar concentration were 15% and 24%, respectively. Sugar compositions in BSG hydrolysate were 22.02 ± 0.8% glucose, 45.83 ± 1.53% xylose, and 32.13 ± 2.3% arabinose, while those found in SYC hydrolysate were 31.43 ± 0.38% glucose and 69.57 ± 1.04% mannose. Both hydrolysates were used as nutrient sources at the same sugar concentration of 40 g/L for cultivation of three oleaginous yeasts, Trichosporonoides spathulata JU4-57, Rhodotorula mucilaginosa G43 and Yarrowia lipolytica TISTR 5151. BSG hydrolysate gave higher biomass than SYC hydrolysate possibly due to a higher content of suitable sugars for cell growth. Among three yeasts, T. spathulate JU4-57 gave the highest lipid yields of 62.9 ± 5.67 and 39.9 ± 0.62 mg/g-substrate on BSG and SYC hydrolysates, respectively. This study may contribute greatly to low-cost production of oil sources for biodiesel production and may help to increase the environmental and economic sustainability of the brewery business.

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“…Furthermore, integrated energy and chemical production was the most recommended path for the implementation. Recent studies have shown that BSGs can also be used as a feedstock for production of butanol (Plaza et al, 2017), hydrogen (Zhang and Zang, 2016) and carboxylic acid (Liang and Wan, 2015).…”

Section: Introductionmentioning

confidence: 99%

Brewers' spent grains: Drying kinetics and biodiesel production

Mallen

Najdanovic‐Visak

2018

Bioresource Technology Reports

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Enormous amounts of brewers' spent grains (BSGs) per year are generated to produce bear worldwide. BSGs can be used as a carbon source, biofuel to generate energy and as a source of biogas. Typically, BSGs contain more than 60 mass% of water and, therefore, drying kinetics is a paramount for the development of any of these valorisation processes.In this work, we reveal the main parameters and mechanism of drying kinetics of BSGs at isothermal conditions (60 o C-90 o C), measured by thermogravimetric analysis. Diffusion coefficients ranged from 1.4210 -9 m 2 s -1 to 2.6710 -9 m 2 s -1 while the activation energy was 26.6 kJmol -1 . Furthermore, for the first time, biodiesel production from BSGs is reported. We employed acid catalysed in situ transesterification process, at different catalyst concentrations, methanol to BSGs ratios, reaction time and temperature.The outcomes of our study show promise for alternative valorisation of brewers' spent grains, an abundant waste spread around the world.

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Biobutanol production from brewer’s spent grain hydrolysates by Clostridium beijerinckii

Cited by 85 publications

References 41 publications

Intensifying ethanol production from brewer’s spent grain waste: Use of whole slurry at high solid loadings

Intensifying ethanol production from brewer’s spent grain waste: Use of whole slurry at high solid loadings

Acid Hydrolysis of Brewers’ Industrial Wastes and Their Use for Lipid Production by Oleaginous Yeasts

Brewers' spent grains: Drying kinetics and biodiesel production

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