Continuous bioethanol fermentation from wheat straw hydrolysate with high suspended solid content using an immersed flat sheet membrane bioreactor

Mahboubi, Amir; Ylitervo, Paeivi; Doyen, W.; Wever, Heleen De; Molenberghs, Bart; Taherzadeh, Mohammad J.

doi:10.1016/j.biortech.2017.05.125

Cited by 38 publications

(12 citation statements)

References 34 publications

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“…The efficiency yields previously proposed [38,39] were recently confirmed from a cluster of lignocellulosic [40][41][42][43] and starchy waste streams [36,[44][45][46] considered in this project. To validate the ethanol fermentation yields values also from residues rich in simple sugars, few sugary byproducts were selected and fermented by an efficient Saccharomyces cerevisiae strain as described below.…”

Section: Bioethanol Potential From Residual Agro-food Wastessupporting

confidence: 66%

“…Based on the fermentable sugars, cellulose, hemicellulose, and starch contents, the potential bioethanol was figured out for each biomass, as described in Materials and Methods using the yields proposed by Spatari et al [38] and Godin and colleagues [39]. These values were recently confirmed in literature from a cluster of lignocellulosic [40][41][42][43] and starchy waste steams [36,44,45] considered in this project. On the contrary, no papers dealing with sugary byproducts available in the geographical district here selected have been recently published.…”

Section: Potential Bioethanol Yieldmentioning

confidence: 54%

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Agro-Food Residues and Bioethanol Potential: A Study for a Specific Area

Basaglia

D’Ambra²,

Piubello³

et al. 2021

Processes

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Bioethanol obtained from agro-food wastes could contribute to decrease the dependency on fossil resources, reduce the impact of fossil fuels on the environment, and mitigate the food versus fuel debate. This study is aimed to investigate the availability of residual inexpensive agro-food biomasses that could feed a second-generation bioethanol plant located in a specific area of North Eastern Italy. After the identification of all crops in the area, more than 40 agro-food residues were analyzed for their availability and compositions in terms of water, polysaccharides, and sugars potentially convertible into bioethanol. 574,166 Mg of residual wet lignocellulosic biomass corresponding to 297,325 Mg of dry material were found available for bioethanol conversion. The most promising substrates were wheat straw and vine shoots. Based on the chemical composition of residues, the potential attainable ethanol was determined. Theoretical potential ethanol production was estimated at nearly 72,000 Mg per year. This quantity extensively exceeds the minimum yearly capacity of a sustainable bioethanol plant previously identified as around 50,000 Mg of ethanol. Taken together, these results demonstrate that, in the analyzed area, agro-food residues are available in an amount that could sustain bioethanol production in a specific and restricted district. Techno-economical evaluations are in progress to assess the actual feasibility of installing a second generation bioethanol production plant in the area of interest.

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Section: Bioethanol Potential From Residual Agro-food Wastessupporting

confidence: 66%

Section: Potential Bioethanol Yieldmentioning

confidence: 54%

Agro-Food Residues and Bioethanol Potential: A Study for a Specific Area

Basaglia

D’Ambra²,

Piubello³

et al. 2021

Processes

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“…Currently, wheat straw is used as animal feed, as supporting materials (Panthapulakkal et al 2006), as raw material for pulp and paper production (Nasser et al 2015), and as a substrate for biogas, bioethanol, and mushroom production. Wheat straw is also burnt as a fuel and is added to soil for its maintenance (Ferreira et al 2014;Huang et al 2017;Mahboubi et al 2017;Tomás-Pejó et al 2017). Wheat straw contains 350-450 g kg −1 cellulose, making it an excellent potential source of energy for ruminants.…”

Section: Introductionmentioning

confidence: 99%

Utilization of wheat straw for fungal phytase production

Shahryari

Fazaelipoor

Setoodeh

et al. 2018

Int J Recycl Org Waste Agricult

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Purpose Wheat straw is an agricultural waste which can be used as a cost effective animal feed. However, high hemicellulose and phytic acid content in wheat straw prevents it as a primary feed choice. Utilization of wheat straw in solid-state fermentation may result in wheat straw valorization and enzyme production. In this study, phytase production in solid-state fermentation of wheat straw using Aspergillus ficuum and valorization of wheat straw were evaluated. Methods A two-step experimental design procedure was employed for screening and optimization of influencing factors on phytase production. Effects of different nutritional and environmental factors were investigated by one factor at the time method (OFATM). To reach higher amounts of phytase, response surface methodology (RSM) was employed to optimize phytase production as a function of three of the most effective factors. Results Optimization of the significant parameters resulted in an increase in the phytase activity from 0.74 ± 0.12 to a maximum of 16.46 ± 0.56 Units per gram dry substrate (U gds −1). The high degree of the fungal phytase activity on wheat straw resulted in the decrease in phytic acid content by 57.4%, as compared to the untreated sample. Scanning electron microscopy (SEM) and FTIR structural analysis showed intensive fungal growth on wheat straw, and partial removal of hemicelluloses, lignin and phytic acid. Conclusion The study demonstrated the feasibility of wheat straw utilization in solid-state fermentation using Aspergillus ficuum toward the production of phytase and valorization of wheat straw as an animal feed.

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“…MBR fermentation systems have significant advantages over conventional fermentation modes as they can provide high cell concentrations in the reactor that allow efficient conversion of substrates into products and also higher tolerance to cell inhibitory compounds [23]. Moreover, higher dilution rates can be achieved since undesired cell washout is prevented [24]. However, higher dilution rates require higher permeate fluxes through a given membrane surface area which increases membrane fouling tendency [25].…”

Section: Mbr Filtration Using Buffer As Feed Solutionmentioning

confidence: 99%

“…A higher dilution rate and filtration flux is desirable because it raise the productivity in continuous fermentation processes [24,31]. However, for every membrane filtration system there is a critical flux below which extensive cake layer formation and fouling can be prevented [32].…”

Section: The Effect Of Dilution Rate Backwash and Membrane Surface Amentioning

confidence: 99%

Removal of Bacterial Contamination from Bioethanol Fermentation System Using Membrane Bioreactor

et al. 2018

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A major issue hindering efficient industrial ethanol fermentation from sugar-based feedstock is excessive unwanted bacterial contamination. In industrial scale fermentation, reaching complete sterility is costly, laborious, and difficult to sustain in long-term operation. A physical selective separation of a co-culture of Saccharomyces cerevisiae and an Enterobacter cloacae complex from a buffer solution and fermentation media at dilution rates of 0.1-1 1/h were examined using an immersed membrane bioreactor (iMBR). The effect of the presence of yeast, inoculum size, membrane pore size, and surface area, backwashing and dilution rate on bacteria removal were assessed by evaluating changes in the filtration conditions, medium turbidity, and concentration of compounds and cell biomass. The results showed that using the iMBR with dilution rate of 0.5 1/h results in successful removal of 93% of contaminating bacteria in the single culture and nearly complete bacteria decontamination in yeast-bacteria co-culture. During continuous fermentation, application of lower permeate fluxes provided a stable filtration of the mixed culture with enhanced bacteria washout. This physical selective separation of bacteria from yeast can enhance final ethanol quality and yields, process profitability, yeast metabolic activity, and decrease downstream processing costs.

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Continuous bioethanol fermentation from wheat straw hydrolysate with high suspended solid content using an immersed flat sheet membrane bioreactor

Cited by 38 publications

References 34 publications

Agro-Food Residues and Bioethanol Potential: A Study for a Specific Area

Agro-Food Residues and Bioethanol Potential: A Study for a Specific Area

Utilization of wheat straw for fungal phytase production

Removal of Bacterial Contamination from Bioethanol Fermentation System Using Membrane Bioreactor

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