Pilot-scale xylooligosaccharide production through steam explosion of screw press–dried brewers’ spent grains

Swart, Lukas J.; Bedzo, Oscar K. K.; Rensburg, Eugéne van; Görgens, Johann F.

doi:10.1007/s13399-020-01099-w

Cited by 15 publications

(9 citation statements)

References 47 publications

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“…The plant is annexed to a large brewery that provides a feed flow rate of 150 t dry BSG per day (t DM d –1 ). Table 1 shows the BSG composition used on a dry basis 41 …”

Section: Methodsmentioning

confidence: 99%

“…A preferred autocatalytic HTT process condition at 180 °C and 10 min (80.3% total xylan recovery, 74.2% XOS yield) was used for scenarios A and B, 41 whereas for Scenario C, results from LHW HTT in the stirred‐batch system using acid dosing of 46 mg H 2 SO 4 g −1 dry BSG at 120 °C for 15 min (85% total xylan recovery, 47% XOS yield) 78 . Glucose, GlcOS and 5‐hydroxymethylfurfural (HMF) reported based on the initial starch and residual insoluble solid content showing the extent of protein, lignin and ash reduction in the HTT process, were used.…”

Section: Methodsmentioning

confidence: 99%

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Techno‐economic analysis of the valorization of brewers spent grains: production of xylitol and xylo‐oligosaccharides

Swart

Petersen

Bedzo

et al. 2021

J of Chemical Tech & Biotech

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BACKGROUND Brewers spent grains (BSG) represents ≤85% of a brewery's solid waste and common disposal to landfill is increasingly more difficult. Yet BSG is a food‐grade by‐product with potential economic valorization that can significantly improve resource efficiency and reduction in carbon emissions. This study investigated valorization of BSG through the application of novel high solids hydrothermal processing technology in a small‐scale biorefinery, annexed to a brewery. It focused on three scenarios for the production of: (A) the sugar replacement xylitol; (B) prebiotic xylo‐oligosaccharide (XOS); and (C) co‐production of xylitol and XOS. Economic assessment was conducted by comparing the capital and operating expenditure from process simulations created in Aspen Plus®. The process models developed were supplemented with experimental data to improve accuracy. RESULTS Internal rate of return (IRR) values obtained were greater than the hurdle rate of 9.7% for all scenarios when considering a conservative market price for xylitol and XOS as US$4500 t–1, yet dedicated production of XOS was economically more favourable with a minimum required selling price (MRSP) of US$2509 t–1 compared to US$4153 t–1 for xylitol. Additionally, the scenario for co‐production of xylitol and XOS achieved the lowest MRSP of US$2182 t–1. By‐products significantly contributed to 32.7%, 14.2% and 27.5% of the revenue generated in scenarios A, B and C, respectively. CONCLUSION These results provide a good platform from which to develop the cost‐effective commercial production of XOS and xylitol from BSG. © 2021 Society of Chemical Industry

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“…The plant is annexed to a large brewery that provides a feed flow rate of 150 t dry BSG per day (t DM d –1 ). Table 1 shows the BSG composition used on a dry basis 41 …”

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Techno‐economic analysis of the valorization of brewers spent grains: production of xylitol and xylo‐oligosaccharides

Swart

Petersen

Bedzo

et al. 2021

J of Chemical Tech & Biotech

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“…The steam explosion process on the other hand, can process large volumes of biomass using direct steam and an explosive discharge for heating and cooling, respectively. The steam explosion process is one of few technologies that has advanced to pilot scale testing [9,11,15]. Sweet sorghum bagasse contains two primary monomeric sugar units, namely xylose and glucose.…”

Section: Introductionmentioning

confidence: 99%

Maximizing total sugar recovery from pretreatment-hydrolysis of sweet sorghum bagasse through cultivar selection and process optimization

Bedzo

Diedericks

McIntosh

et al. 2023

Preprint

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The nature of a sweet sorghum cultivar influences the recovery of sugars from the bagasse during pretreatment. The sugars recovered are used in applications for conversion to high-value products such as alcohols, organic acids, and other fuels and chemicals. The severity of the pretreatment used plays a crucial role in the yield and quality of the sugars that can be recovered. Therefore, a strategic approach was taken to lower the severity of the pretreatment process to a combined severity factor (CSF) value of 0.48, whilst maintaining a high level of total-sugar recovery (i.e. 68% (w/w) and higher). This was achieved by screening 23 sweet sorghum cultivars for high-performance characteristics at low-severity conditions and optimizing the pretreatment process conditions. The pretreatment conditions included time, temperature, and acid concentration ranges of 5 to 60 min, 150 to 210 oC, and 0.00% to 0.96% (w/w) H2SO4, respectively. Cultivar AP6 was identified as the best performer, producing the highest total sugar yield of 78.17%. A reduction in total by-product formation from 4.79 to 2.79 g/100 g biomass was also observed. Three preferred cultivars selected for pilot scale pretreatment using steam explosion resulted in maximum total sugar recoveries that exceeded 80% (w/w). Cultivar engineering/selection provides an opportunity to utilize lignocelluloses that will liberate sugars at desired yields while reducing the generation of by-products by implementing low severity pretreatments.

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“…Craft breweries have high water, energy and carbon dioxide (CO 2 ) demands, and generate large quantities of solid and liquid wastes and greenhouse gases. Spent grains account for up to 85% of the solid waste generated in craft breweries [3] and are typically sent to farmers for use as animal feed. Beer brewing requires 4 to 20 m 3 of water to produce each m 3 of beer.…”

Section: Introductionmentioning

confidence: 99%

Recovery of Energy and Carbon Dioxide from Craft Brewery Wastes for Onsite Use

Rawalgaonkar,

Zhang,

Walker

et al. 2023

Fermentation

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Interest in craft beers is increasing worldwide due to their flavor and variety. However, craft breweries have high water, energy, and carbon dioxide (CO2) demands and generate large quantities of high-strength waste and greenhouse gases. While many large breweries recover energy using anaerobic digestion (AD) and recapture CO2 from beer fermentation, little is known about the economic feasibility of applying these technologies at the scale of small craft breweries. In addition, compounds in hops (Humulus lupulus), which are commonly added to craft beer to provide a bitter or “hoppy” flavor, have been shown to adversely affect anaerobic microbes in ruminant studies. In this study, biochemical methane potential (BMP) assays and anaerobic sequencing batch reactor (ASBR) studies were used to investigate biomethane production from high-strength craft brewery waste, with and without hop addition. A spreadsheet tool was developed to evaluate the economic feasibility of bioenergy and CO2 recovery depending on the brewery’s location, production volume, waste management, CO2 requirement, energy costs, and hop waste addition. The results showed that co-digestion of yeast waste with 20% hops (based on chemical oxygen demand (COD)) resulted in slightly lower methane yields compared with mono-digestion of yeast; however, it did not significantly impact the economic feasibility of AD in craft breweries. The use of AD and CO2 recovery was found to be economically feasible if the brewery’s annual beer production is >50,000 barrels/year.

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Pilot-scale xylooligosaccharide production through steam explosion of screw press–dried brewers’ spent grains

Cited by 15 publications

References 47 publications

Techno‐economic analysis of the valorization of brewers spent grains: production of xylitol and xylo‐oligosaccharides

Techno‐economic analysis of the valorization of brewers spent grains: production of xylitol and xylo‐oligosaccharides

Maximizing total sugar recovery from pretreatment-hydrolysis of sweet sorghum bagasse through cultivar selection and process optimization

Recovery of Energy and Carbon Dioxide from Craft Brewery Wastes for Onsite Use

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