Hot Water Pretreatment of Boreal Aspen Woodchips in  a Pilot Scale Digester

Yan, Jipeng; Liu, Shijie

doi:10.3390/en8021166

Cited by 14 publications

(11 citation statements)

References 35 publications

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“…In the current study, conversion efficiencies were found maximum for shorter pretreatment time (5 min). High residence time at elevated temperatures during pretreatment led to high pretreatment severity and produced several compounds inhibitory to enzymes and yeasts [38,39]. Weil et al [9] found that improvement in hydrolysis efficiency of corn fiber decreased with increase in pretreatment severity.…”

Section: Effect Of Hot Water Pretreatment On Fiber Conversionmentioning

confidence: 99%

Ethanol Production from Corn Fiber Separated after Liquefaction in the Dry Grind Process

et al. 2018

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Conversion of corn fiber to ethanol in the dry grind process can increase ethanol yields, improve coproduct quality and contribute to process sustainability. This work investigates the use of two physio-chemical pretreatments on corn fiber and effect of cellulase enzyme dosage to improve ethanol yields. Fiber separated after liquefaction of corn was pretreated using (I) hot water pretreatment (160 °C for 5, 10 or 20 min) and (II) wet disk milling and converted to ethanol. The conversion efficiencies of hot water pretreated fiber were higher than untreated fiber, with highest increase in conversion (10.4%) achieved for 5 min residence time at 160 °C. Disk milling was not effective in increasing conversion compared to other treatments. Hydrolysis and fermentation of untreated fiber with excess cellulase enzymes resulted in 33.3% higher conversion compared to untreated fiber.

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Section: Effect Of Hot Water Pretreatment On Fiber Conversionmentioning

confidence: 99%

Ethanol Production from Corn Fiber Separated after Liquefaction in the Dry Grind Process

et al. 2018

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“…For example, from woody biomass, hot water extraction in a pilot-scale allowed to achieve high release of glucose and xylose mainly originated from hemicellulose and also xylose oligomers. Reducing extraction time helped to limit sugars degradation although decreasing sugar yields (Yan and Liu, 2015; Yan et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

Wheat Bran Pretreatment by Room Temperature Ionic Liquid-Water Mixture: Optimization of Process Conditions by PLS-Surface Response Design

et al. 2019

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Room Temperature Ionic Liquids (RTILs) pretreatment are well-recognized to improve the enzymatic production of platform molecules such as sugar monomers from lignocellulosic biomass (LCB). The conditions for implementing this key step requires henceforth optimization to reach a satisfactory compromise between energy saving, required RTIL amount and hydrolysis yields. Wheat bran (WB) and destarched wheat bran (DWB), which constitute relevant sugar-rich feedstocks were selected for this present study. Pretreatments of these two distinct biomasses with various 1-ethyl-3-methylimidazolium acetate ([C2mim][OAc])-water mixtures prior to hydrolysis catalyzed by hemicellulolytic cocktail (Cellic CTec2) were finely investigated. The main operating conditions such as pretreatment temperature (25–150°C), time (40–180 min), WB and DWB loading (2–5% w/v) and concentration of [C2mim][OAc] in water [10–100% (v/v)] were screened through glucose and xylose yields and then optimized through a Partial Least Square (PLS)—Second Order Design. In an innovative way, the PLS results showed that the four factors and their interactions could be well-fitted by a second-order model ( p < 0.05). The quadratic PLS models were used to predict optimal pretreatment conditions. Thus, maximum glucose (83%) and xylose (95%) yields were obtained from enzymatic hydrolysis of WB pretreated at 150°C for 40 min with 10% of [C2mim][OAc] in water and 5% of WB loading. For DWB, maximum glucose (100%) and xylose (57%) yields were achieved for pretreatment temperatures of 150°C and 25°C, respectively. The required duration was still 40 min, with 20% of [C2mim][OAc] in water and a 5% DWB loading. Then, Multiple Response Optimization (MRO) performed by Nelder-Mead Simplex Method displayed sugar yields similar to those obtained by individual PLS optimization. This complete statistical study confirmed that the established models were appropriate to predict the sugar yields achieved after different pretreatment conditions from WB and DWB biomasses. Finally, Scanning Electron microscopy (SEM) studies allowed us to establish clearer link between structural changes induced by pretreatment and the best enzymatic performances obtained.

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“…This pretreatment shows great potential for degrading lignocellulosic material thus making it easily accessible to enzymes by disrupting the interpolymeric association between lignin, hemicellulose, and cellulose [51]; and this leads to minimal production of potentially inhibitory products [52]. Chen et al [53], in their work on the investigation of the degradation of carbohydrates and lignin of the aspen wood during hot water extraction, show that the degradation of xylose did not occur until 150 • C. Kilpelainen et al [54] who worked on extraction of birch sawdust using pressurized hot water, reported only trace amounts of furfurals in the extracts after heat treatment at 150 to 160 • C. The amount of hydroxymethyl furfural (HMF) was under 6 µg/L for all extraction temperatures between 150 and 190 • C. However, no furfural or HMF was detected in hot water pretreatment of boreal aspen woodchips at 160 • C and 210 Min [55].…”

Section: Figmentioning

confidence: 99%

Utilization of prickly pear waste for baker's yeast production

Diboune

Nancib

et al. 2019

Biotech and App Biochem

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The feasibility of baker's yeast production using fruits and peels of Opuntia ficus indica (OFI) as carbohydrate feedstock was investigated. Two response surface methodologies involving central composite face centered design (CCFD) were successfully applied. The effects of four independent variables on baker's yeast production from OFI fruit juice was evaluated using the first CCFD. The best results were obtained with 24 H of inoculum age, 30 °C temperature, 200 rpm of agitation, and 10% inoculum size. At the maximum point, the biomass concentration reached 9.29 g/L. A second CCFD was performed to optimize the sugar extraction from OFI fruit peels. The potential of these latter as a fermentation substrate was determined. From the experimental results, the OFI fruit peel is an appropriate carbon source for the production of baker's yeast. The maximum biomass concentration was 12.51 g/L. Different nitrogen supplements were added to promote the yields of baker's yeast. Corn steep liquor was found to be the best alternative nutrient source of casein hydrolysate and yeast extract for baker's yeast production.

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Hot Water Pretreatment of Boreal Aspen Woodchips in a Pilot Scale Digester

Cited by 14 publications

References 35 publications

Ethanol Production from Corn Fiber Separated after Liquefaction in the Dry Grind Process

Ethanol Production from Corn Fiber Separated after Liquefaction in the Dry Grind Process

Wheat Bran Pretreatment by Room Temperature Ionic Liquid-Water Mixture: Optimization of Process Conditions by PLS-Surface Response Design

Utilization of prickly pear waste for baker's yeast production

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