Pretreatment Technologies for Lignocellulose-to-Bioethanol Conversion

Tomás‐Pejó, Elia; Alvira, Pablo; Ballesteros, Mercedes; Negro, M.J.

doi:10.1016/b978-0-12-385099-7.00007-3

Cited by 87 publications

(73 citation statements)

References 116 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Furfural (1 g/L) and 5-HMF (0.1 g/L), coming from sugar degradation, were also present in lower concentration. These results are in accordance to previous works that shown similar inhibitors composition and content in steam-exploded wheat straw prehydrolysates [2,18].…”

Section: Experimental Designsupporting

confidence: 83%

Optimization of the laccase detoxification step in hybrid hydrolysis and fermentation processes from wheat straw by K. marxianus CECT 10875

Oliva-Taravilla¹,

Tomás‐Pejó²,

Demuez³

et al. 2016

Bioethanol

View full text Add to dashboard Cite

The addition of laccase enzymes reduces the amount of phenols present in lignocellulosic pretreated materials and increases their fermentability. However, laccase addition in combination with cellulases reduces hydrolysis yields. In this work, hybrid hydrolysis and fermentation (HHF) configuration allowed overcoming the negative effect of laccase treatment on enzymatic hydrolysis. Furthermore, the effects of different laccase dosages, length of detoxification time and inoculum size on ethanol production were evaluated. In the evaluated configurations, the different laccase dosages did not show any significant effect on enzymatic hydrolysis. The lowest laccase dosage (0.5 IU/g DW) removed ~70% of total phenols which was enough to reach the highest ethanol production yields (~10 g/L) using K. marxianus CECT 10875. Shorter detoxification times and larger inoculum sizes had a positive impact on both ethanol production and volumetric productivity. These optimal detoxification conditions enable the fermentation of inhibitory slurries by reducing the overall time and cost of the process.

show abstract

Section: Experimental Designsupporting

confidence: 83%

Optimization of the laccase detoxification step in hybrid hydrolysis and fermentation processes from wheat straw by K. marxianus CECT 10875

Oliva-Taravilla¹,

Tomás‐Pejó²,

Demuez³

et al. 2016

Bioethanol

View full text Add to dashboard Cite

show abstract

“…From both figures it can be seen that the type of soaking pretreatment is more effective to decrease the crude fiber content in solid sago waste followed by heating pretreatment and without pretreatment. Choosing the right pretreatment method is very important because it determines which hydrolysis and fermentation methods will be used later [19]. The uses of strong base solution in this study aims to make the solid sago waste can undergo a delignification process before going into the fermentation process.…”

Section: Results Analysis Stagementioning

confidence: 99%

Livestock Feed Production from Sago Solid Waste by Pretreatment and Anaerobic Fermentation Process

Sumardiono

et al. 2018

MATEC Web Conf.

View full text Add to dashboard Cite

Abstract. Food needs in Indonesia is increasing, including beef. Today, Indonesia has problem to do selfsufficiency in beef. The cause of the problem is the quality of local beef is still lower compared with imported beef due to the quality of livestock feed consumed. To increase the quality of livestock is through pretreatment and fermentation. Source of livestock feed that processed is solid sago waste (Arenga microcarpa), because in Indonesia that is relatively abundant and not used optimally. Chemical pretreatment process for delignification is by using NaOH solution. The purposes of this research are to study NaOH pretreatment, the addition of Trichoderma sp, and fermentation time to improve the quality of sago solid waste as livestock feed through anaerobic fermentation. The variables used are addition or without addition (4%w NaOH solution and Trichoderma sp 1%w) and fermentation time (7, 14 and 21 days), with the response of crude fiber and protein. The result of this research shows that the pretreatment with soaking of NaOH solution, addition of Trichoderma sp and 14 days of fermentation was more effective to improve the quality of solid sago waste with decrease of crude fiber from 33.37% to 17.36% and increase of crude protein from 4.00% to 7.96%.

show abstract

“…The corn was ground using a Fitz Mill (Model DAS 06, Fitzpatrick Co., Elmhurst, IL, USA) according to Sekhon et al [6]. The particle retention (%) on U.S.-standard sieve numbers 16,20,30,40,50,70, and the pan after grinding was 17.8%, 17.3%, 17.6%, 12.9%, 11.2%, 9.2%, 7.7%, and 0.03%, respectively. The particles per gram were 119,335 and surface area (cm 2 /g) was 116.…”

Section: Methodsmentioning

confidence: 99%

Ethanol Production by Soy Fiber Treatment and Simultaneous Saccharification and Co-Fermentation in an Integrated Corn-Soy Biorefinery

et al. 2018

View full text Add to dashboard Cite

Insoluble fiber (IF) recovered from the enzyme-assisted aqueous extraction process (EAEP) of soybeans is a fraction rich in carbohydrates and proteins. It can be used to enhance ethanol production in an integrated corn-soy biorefinery, which combines EAEP with traditional corn-based ethanol processing. The present study evaluated IF as a substrate for ethanol production. The effects of treatment of IF (soaking in aqueous ammonia (SAA), liquid hot water (LHW), and enzymatic hydrolysis), primarily simultaneous saccharification and co-fermentation (SSCF), as well as scaling up (250 mL to 60 L) on ethanol production from IF alone or a corn and IF slurry were investigated. Enzymatic hydrolysis (pectinase, cellulase, and xylanase, each added at 5% soy solids during simultaneous saccharification and fermentation/SSCF) was the best treatment to maximize ethanol production from IF. Ethanol yield almost doubled when SSCF of IF was performed with Saccharomyces cerevisiae and Escherichia coli KO11. Addition of IF in dry-grind corn fermentation increased the ethanol production rate (~31%), but low ethanol tolerance of E. coli KO11 was a limiting factor for employing SSCF in combination corn and IF fermentation. Nonlinear Monod modeling accurately predicted the effect of ethanol concentration on E. coli KO11 growth kinetics by Hanes-Woolf linearization. Collectively, the results from this study suggest a potential of IF as a substrate, alone or in dry-grind corn fermentation, where it enhances the ethanol production rate. IF can be incorporated in the current bioethanol industry with no added capital investment, except enzymes.

show abstract

Pretreatment Technologies for Lignocellulose-to-Bioethanol Conversion

Cited by 87 publications

References 116 publications

Optimization of the laccase detoxification step in hybrid hydrolysis and fermentation processes from wheat straw by K. marxianus CECT 10875

Optimization of the laccase detoxification step in hybrid hydrolysis and fermentation processes from wheat straw by K. marxianus CECT 10875

Livestock Feed Production from Sago Solid Waste by Pretreatment and Anaerobic Fermentation Process

Ethanol Production by Soy Fiber Treatment and Simultaneous Saccharification and Co-Fermentation in an Integrated Corn-Soy Biorefinery

Contact Info

Product

Resources

About