Effect of severity on dilute acid pretreatment of lignocellulosic biomass and the following hydrogen fermentation

Gonzales, Ralph Rolly; Sivagurunathan, Periyasamy; Kim, Jun Seok

doi:10.1016/j.ijhydene.2016.06.198

Cited by 114 publications

(41 citation statements)

References 30 publications

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“…X-ray diffraction (XRD) is a technique widely used to characterize the degree of crystallinity of lignocellulosic biomass identifying the amount of amorphous cellulose [32]. This analysis was done due to the acid pretreatment changes the cellulose structure through the disruption of the hydrogen bonding of cellulose fibrils [33].…”

Section: Xrd Analysismentioning

confidence: 99%

“…They are derived from the hemicellulose deacetylation and the dehydration of sugars during the pretreatment. The presence of inhibitor compounds decrease the sugars consumption of different microorganisms, which reduces the fermentation productivity [32]. Among the aliphatic acids detected, significant quantities of acetic acid were liberated from the acetyl groups contained in the CCS until be fully hydrolyzed.…”

Section: Sugars and Inhibitory Compounds In Hydrolysatesmentioning

confidence: 99%

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Effect of dilute sulfuric acid pretreatment on the physicochemical properties and enzymatic hydrolysis of coffee cut-stems

Solarte-Toro

Chacón-Perez

Piedrahita-Rodríguez

et al. 2020

Energy

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Coffee-cut stems are a potential fermentable sugars source, which can be upgraded in different valueadded products and energy vectors. Nevertheless, there are few reports focused on the acid pretreatment and saccharification processes. Thus, this paper evaluates the effect of the acid pretreatment and saccharification conditions of coffee cut-stems to find the highest sugar yield. Thereafter, the influence of the residence time in the acid pretreatment and the b-glucosidase supplementation in the saccharification process were analyzed. The combined severity factor and crystallinity index were used as metrics to evaluate both processes. In all assays, an increase in the crystallinity index was observed. Furthermore, a nonlinear trend of the combined severity factor respect to the residence time in the acid pretreatment was evidenced. The highest sugar yield was 66.75% with a combined severity factor of 1.84. The better saccharification process was achieved at combined severity factor of 2.01 with a digestibility of 43%. The addition of b-glucosidase in the enzymatic hydrolysis allows increasing the value to 69.07%. Hence, low temperatures, acid concentrations, and the b-glucosidase supplementation allows obtaining a high sugar yield from coffee cut stems.

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Section: Xrd Analysismentioning

confidence: 99%

Section: Sugars and Inhibitory Compounds In Hydrolysatesmentioning

confidence: 99%

Effect of dilute sulfuric acid pretreatment on the physicochemical properties and enzymatic hydrolysis of coffee cut-stems

Solarte-Toro

Chacón-Perez

Piedrahita-Rodríguez

et al. 2020

Energy

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show abstract

“…Enzymatic hydrolysis is intended to release monosugars from crystalline cellulose and from the remains of hemicellulose. The efficiency of this step is crucial for the conversion of the biomass to the desired products because monosugars are the source of carbon for fermentative microorganisms [50]. The conversion of cellulose and hemicellulose is catalyzed by glucosidase and hemicellulases.…”

Section: Enzymatic Hydrolysis Of Pre-treated Energetic Willowmentioning

confidence: 99%

Optimization of Saccharification Conditions of Lignocellulosic Biomass under Alkaline Pre-Treatment and Enzymatic Hydrolysis

et al. 2018

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Abstract:Pre-treatment is a significant step in the production of second-generation biofuels from waste lignocellulosic materials. Obtaining biofuels as a result of fermentation processes requires appropriate pre-treatment conditions ensuring the highest possible degree of saccharification of the feed material. An influence of the following process parameters were investigated for alkaline pre-treatment of Salix viminalis L.: catalyst concentration (NaOH), temperature, pre-treatment time and granulation. For this purpose, experiments were carried out in accordance to the Box-Behnken design for four factors. In the saccharification process of the pre-treated biomass, cellulolytic enzymes immobilized on diatomaceous earth were used. Based on the obtained results, a mathematical model for the optimal conditions of alkaline pre-treatment prediction is proposed. The optimal conditions of alkaline pre-treatment are established as follows: granulation 0.75 mm, catalyst concentration 7%, pre-treatment time 6 h and temperature 65 • C if the saccharification efficiency and cost analysis are considered. An influence of the optimized pre-treatment on both the chemical composition and structural changes for six various lignocellulosic materials (energetic willow, energetic poplar, beech, triticale, meadow grass, corncobs) was investigated. SEM images of raw and pre-treated biomass samples are included in order to follow the changes in the biomass structure during hydrolysis.

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“…lignin. The content of cellulose, the most important component, was comparable to that of other feedstock commonly used for bioethanol production, e.g., 36.3% for corn stover [41], 36.9% for sweet sorghum bagasse [33], 35.8% for rice straw [42], and 38.7% for wheat straw [43].…”

Section: Chemical Composition Of Raw and Pretreated Jerusalem Artichomentioning

confidence: 67%

Nitric Acid Pretreatment of Jerusalem Artichoke Stalks for Enzymatic Saccharification and Bioethanol Production

et al. 2018

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This paper evaluated the effectiveness of nitric acid pretreatment on the hydrolysis and subsequent fermentation of Jerusalem artichoke stalks (JAS). Jerusalem artichoke is considered a potential candidate for producing bioethanol due to its low soil and climate requirements, and high biomass yield. However, its stalks have a complexed lignocellulosic structure, so appropriate pretreatment is necessary prior to enzymatic hydrolysis, to enhance the amount of sugar that can be obtained. Nitric acid is a promising catalyst for the pretreatment of lignocellulosic biomass due to the high efficiency with which it removes hemicelluloses. Nitric acid was found to be the most effective catalyst of JAS biomass. A higher concentration of glucose and ethanol was achieved after hydrolysis and fermentation of 5% (w/v) HNO3-pretreated JAS, leading to 38.5 g/L of glucose after saccharification, which corresponds to 89% of theoretical enzymatic hydrolysis yield, and 9.5 g/L of ethanol. However, after fermentation there was still a significant amount of glucose in the medium. In comparison to more commonly used acids (H2SO4 and HCl) and alkalis (NaOH and KOH), glucose yield (% of theoretical yield) was approximately 47–74% higher with HNO3. The fermentation of 5% nitric-acid pretreated hydrolysates with the absence of solid residues, led to an increase in ethanol yield by almost 30%, reaching 77–82% of theoretical yield.

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Effect of severity on dilute acid pretreatment of lignocellulosic biomass and the following hydrogen fermentation

Cited by 114 publications

References 30 publications

Effect of dilute sulfuric acid pretreatment on the physicochemical properties and enzymatic hydrolysis of coffee cut-stems

Effect of dilute sulfuric acid pretreatment on the physicochemical properties and enzymatic hydrolysis of coffee cut-stems

Optimization of Saccharification Conditions of Lignocellulosic Biomass under Alkaline Pre-Treatment and Enzymatic Hydrolysis

Nitric Acid Pretreatment of Jerusalem Artichoke Stalks for Enzymatic Saccharification and Bioethanol Production

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