Steam explosion pretreatment of triticale (× Triticosecale Wittmack) straw for sugar production

Agudelo, Roberto A.; García-Aparicio, María; Görgens, Johann F.

doi:10.1016/j.nbt.2015.10.001

Cited by 35 publications

(16 citation statements)

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“…For the untreated BSG, saccharification yield decreased with the increase of solid loading. In fact, high solid loading may hinder the enzymatic saccharification as result of poor efficiency of mass transfer [45,47].…”

Section: Enzymatic Saccharification Of Untreated and Pretreated Bsg Amentioning

confidence: 99%

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: Enzymatic Saccharification Of Untreated and Pretreated Bsg Amentioning

confidence: 99%

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

et al. 2019

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“…participation rate is defined for access to grain and straw, (4) triticale yields vary between 1.1 and 1.8 mt/acre in Alberta. 15 The procurement model supports the identification of a value proposal for the farmers to support the switch from other cereals to triticale.…”

Section: Case Study Contextmentioning

confidence: 82%

“…A biomass procurement model was defined to support the identification of strategic opportunities to deliver the right amount of grain and straw to the biorefinery at a minimum procurement cost . Certain key assumptions were used to develop the model, such as (1) the wheat supply chain is the current case, (2) biomass losses are reduced throughout the procurement process, (3) a farmer participation rate is defined for access to grain and straw, (4) triticale yields vary between 1.1 and 1.8 mt/acre in Alberta . The procurement model supports the identification of a value proposal for the farmers to support the switch from other cereals to triticale.…”

Section: Resultsmentioning

confidence: 99%

“…Triticale's competitive advantages against other crops have been demonstrated, including a potential of 20% higher yield than Canadian Prairie Spring (CPS) wheat, higher biomass and starch content than other crops, good agronomics on marginal soil, lack of competition for food and feed applications, and a good prospect for genetic modifications for improved trait expression . Triticale offers potential for use as a feedstock for biofuel production at a cost per tonne lower than feed wheat . Principally in Alberta, 76 000 acres of triticale have been reported, of which 15 000 acres are harvested as grain, while the remainder of the crop is used primarily for silage and pasture, often in combination with other crops.…”

Section: Introductionmentioning

confidence: 99%

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Systematic assessment of triticale‐based biorefinery strategies: investment decisions for sustainable biorefinery business models

Chambost

Janssen

Stuart

2018

Biofuels Bioprod Bioref

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Strategic investments in biorefinery projects are increasingly being made, and involve non‐traditional decision making, especially considering the technology and market risks involved. From the investor's perspective, the decision‐making process leading to product/process combinations for implementation as a biorefinery to achieve a sustainable business model and good economic returns is not obvious. Typical metrics used for investment decision making have some limitations regarding the recognition of acceptable technology risks relative to economic returns. They often do not appropriately consider factors and analyses related to, for example, environmental impact and the longer term competitive position of new product portfolios. The methodology presented in this article is an approach to identifying a ‘practical’ set of multi‐disciplinary decision‐making criteria to enable the selection of the preferred product/process biorefinery implementation strategy. The case of investment options in the triticale (X Triticosecale Wittmack) biorefinery is used as an example. Through this risk‐based methodology, technology risks as well as economic, environmental, and competitive benefits associated with different business model options are identified. This methodology leads to the development of a series of multi‐criteria decision‐making (MCDM) panels to define a set of practical criteria suitable for a final MCDM for the identification of triticale‐based biorefinery alternatives leading to long‐term and sustainable business models. © 2018 Society of Chemical Industry and John Wiley & Sons, Ltd

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“…Steam explosion (StEx) was performed in an automated batch pilot scale unit (IAP GmBH, Graz, Austria) equipped with a 19 L reaction vessel, a 100 L expansion vessel and a 40 bar steam boiler [ 43 ]. In preparation for StEx pretreatment, untreated sugarcane bagasse or CLM was pre-soaked in reverse-osmosis water overnight at a solid-to-water ratio of 1:2 to ensure maximum water absorption into the biomass.…”

Section: Methodsmentioning

confidence: 99%

Ethanol production potential from AFEX™ and steam-exploded sugarcane residues for sugarcane biorefineries

Mokomele

Sousa

Balan

et al. 2018

Biotechnol Biofuels

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BackgroundExpanding biofuel markets are challenged by the need to meet future biofuel demands and mitigate greenhouse gas emissions, while using domestically available feedstock sustainably. In the context of the sugar industry, exploiting under-utilized cane leaf matter (CLM) in addition to surplus sugarcane bagasse as supplementary feedstock for second-generation ethanol production has the potential to improve bioenergy yields per unit land. In this study, the ethanol yields and processing bottlenecks of ammonia fibre expansion (AFEX™) and steam explosion (StEx) as adopted technologies for pretreating sugarcane bagasse and CLM were experimentally measured and compared for the first time.ResultsEthanol yields between 249 and 256 kg Mg−1 raw dry biomass (RDM) were obtained with AFEX™-pretreated sugarcane bagasse and CLM after high solids loading enzymatic hydrolysis and fermentation. In contrast, StEx-pretreated sugarcane bagasse and CLM resulted in substantially lower ethanol yields that ranged between 162 and 203 kg Mg−1 RDM. The ethanol yields from StEx-treated sugarcane residues were limited by the aggregated effect of sugar degradation during pretreatment, enzyme inhibition during enzymatic hydrolysis and microbial inhibition of S. cerevisiae 424A (LNH-ST) during fermentation. However, relatively high enzyme dosages (> 20 mg g−1 glucan) were required irrespective of pretreatment method to reach 75% carbohydrate conversion, even when optimal combinations of Cellic® CTec3, Cellic® HTec3 and Pectinex Ultra-SP were used. Ethanol yields per hectare sugarcane cultivation area were estimated at 4496 and 3416 L ha−1 for biorefineries using AFEX™- or StEx-treated sugarcane residues, respectively.ConclusionsAFEX™ proved to be a more effective pretreatment method for sugarcane residues relative to StEx due to the higher fermentable sugar recovery and enzymatic hydrolysate fermentability after high solids loading enzymatic hydrolysis and fermentation by S. cerevisiae 424A (LNH-ST). The identification of auxiliary enzyme activities, adequate process integration and the use of robust xylose-fermenting ethanologens were identified as opportunities to further improve ethanol yields from AFEX™- and StEx-treated sugarcane residues.Electronic supplementary materialThe online version of this article (10.1186/s13068-018-1130-z) contains supplementary material, which is available to authorized users.

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Steam explosion pretreatment of triticale (× Triticosecale Wittmack) straw for sugar production

Cited by 35 publications

References 29 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

Systematic assessment of triticale‐based biorefinery strategies: investment decisions for sustainable biorefinery business models

Ethanol production potential from AFEX™ and steam-exploded sugarcane residues for sugarcane biorefineries

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