Sustainable and efficient sugar production from wheat straw by pretreatment with biogas digestate

Momayez, Forough; Karimi, Keikhosro; Horváth, Ilona Sárvári

doi:10.1039/c9ra05285b

Cited by 22 publications

(10 citation statements)

References 56 publications

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“…Figure 1D shows that initial uniform and rigid structure of the WS was changed after pretreatment, obtaining a porous structure which can positively influence the enzymatic action. This modification has also been reported by Zheng et al (2018) and Momayez et al (2019) [24,54].…”

Section: Scanning Electron Microscope (Sem) Analysissupporting

confidence: 85%

Production of Cellulosic Ethanol from Enzymatically Hydrolysed Wheat Straws

Ursachi

Gutt

2020

Applied Sciences

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The aim of this study is to find the optimal pretreatment conditions and hydrolysis in order to obtain a high yield of bioethanol from wheat straw. The pretreatments were performed with different concentrations of sulphuric acid 1, 2 and 3% (v/v), and were followed by an enzymatic hydrolysis that was performed by varying the solid-to-liquid ratio (1/20, 1/25 and 1/30 g/mL) and the enzyme dose (30/30 µL/g, 60/60 µL/g and 90/90 µL/g Viscozyme® L/Celluclast® 1.5 L). This mix of enzymes was used for the first time in the hydrolysis process of wheat straws which was previously pretreated with dilute sulfuric acid. Scanning electron microscopy indicated significant differences in the structural composition of the samples because of the pretreatment with H2SO4 at different concentrations, and ATR-FTIR analysis highlighted the changes in the chemical composition in the pretreated wheat straw as compared to the untreated one. HPLC-RID was used to identify and quantify the carbohydrates content resulted from enzymatic hydrolysis to evaluate the potential of using wheat straws as a raw material for production of cellulosic ethanol in Romania. The highest degradation of lignocellulosic material was obtained in the case of pretreatment with 3% H2SO4 (v/v), a solid-to-liquid ratio of 1/30 and an enzyme dose of 90/90 µL/g. Simultaneous saccharification and fermentation were performed using Saccharomyces cerevisiae yeast, and for monitoring the fermentation process a BlueSens equipment was used provided with ethanol, O2 and CO2 cap sensors mounted on the fermentation flasks. The highest concentration of bioethanol was obtained after 48 h of fermentation and it reached 1.20% (v/v).

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Section: Scanning Electron Microscope (Sem) Analysissupporting

confidence: 85%

Production of Cellulosic Ethanol from Enzymatically Hydrolysed Wheat Straws

Ursachi

Gutt

2020

Applied Sciences

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“…These are the compounds that are most easily solubilized in this type of hydrothermal pretreatment, since their structure is less complex than that of other components of the vegetable waste [ 41 , 49 , 51 , 63 , 64 , 65 ]. The decrease in the solid recovery was well in agreement with the literature [ 35 , 66 , 67 , 68 , 69 ]. Additionally, the low values (always lower than 55%) may be explained by the easy solubilization and volatilization phenomena of certain compounds, as previously described by Mok and Antal [ 64 ].…”

Section: Resultssupporting

confidence: 92%

Liquid Hot Water Pretreatment and Enzymatic Hydrolysis as a Valorization Route of Italian Green Pepper Waste to Delivery Free Sugars

Martín-Lara

Chica-Redecillas

Pérez

et al. 2020

Foods

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In this work, liquid hot water pretreatment (autohydrolysis) was used to improve enzymatic hydrolysis of a commonly consumed vegetable waste in Spain, Italian green pepper, to finally produce fermentable sugars. Firstly, the effect of temperature and contact time on sugar recovery during pretreatment (in insoluble solid and liquid fraction) was studied in detail. Then, enzymatic hydrolysis using commercial cellulase was performed with the insoluble solid resulting from pretreatment. The objective was to compare results with and without pretreatment. The results showed that the pretreatment step was effective to facilitate the sugars release in enzymatic hydrolysis, increasing the global sugar yield. This was especially notable when pretreatment was carried out at 180 °C for 40 min for glucose yields. In these conditions a global glucose yield of 61.02% was obtained. In addition, very low concentrations of phenolic compounds (ranging from 69.12 to 82.24 mg/L) were found in the liquid fraction from enzymatic hydrolysis, decreasing the possibility of fermentation inhibition produced by these components. Results showed that Italian green pepper is an interesting feedstock to obtain free sugars and prevent the enormous quantity of this food waste discarded annually.

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“…While untreated wheat straw shows an organized and compact structure, the surface of steam-exploded wheat straw became scattered and porous, due to the destruction of the lignincellulose-hemicellulose complex's integrity. Other authors observed similar changes in wheat straw's morphology and structure caused by various pretreatments when imaging with a scanning electron microscope [24,53]. Due to significantly lower amounts of sugars and, hence, limited suitability for yeast growth experiments, as shown in Fig.…”

Section: Discussionmentioning

confidence: 57%

Optimization of steam explosion parameters for improved biotechnological use of wheat straw

Sulzenbacher

Atzmüller

Hawe

et al. 2021

Biomass Conv. Bioref.

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Using lignocellulosic raw materials as substrate for biotechnological applications has been a focus of research during the last two decades. They contain sugars, which can be used in industrial fermentation processes, in from of polysaccharides (cellulose, hemicellulose). Wheat straw, one representative of lignocellulosic materials, is sustainably and abundantly available, especially in Europe and North America. However, wheat straw, just like any other lignocellulosic material, needs to be pretreated in one way or the other in order to generate sufficient quantities of monosaccharides. One widely used pretreatment for lignocellulosic material is steam explosion combined with enzymatic hydrolysis. In this study, the effects of steam exploding wheat straw in combination with water are presented. By impregnation with water, saccharide yields from subsequent enzymatic hydrolysis increased from 18.8 to 22.6 g L−1 for glucose and 13.8 to 16.4 g L−1 for xylose, respectively. Moreover, the basic steam explosion parameters residence time and temperature were optimized in ranges from 5 to 20 min and 180–200 °C. This further optimization increased the maximum saccharide yield to 41.2 g L−1 for glucose (200 °C, 15 min) and 18.9 g L−1 for xylose (190 °C, 10 min). Finally, the growth of the intensively investigated biotechnological production host Yarrowia lipolytica on hydrolysates derived from different steam explosion parameters was evaluated. Y. lipolytica grew well in media containing up to 90% wheat straw hydrolysate as sole carbon source, demonstrating the potential as substrate for biotechnological processes.

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Sustainable and efficient sugar production from wheat straw by pretreatment with biogas digestate

Abstract: The effect of wheat straw pretreatment with hot water and liquid fraction of biogas digestate was investigated.

Cited by 22 publications

References 56 publications

Production of Cellulosic Ethanol from Enzymatically Hydrolysed Wheat Straws

Production of Cellulosic Ethanol from Enzymatically Hydrolysed Wheat Straws

Liquid Hot Water Pretreatment and Enzymatic Hydrolysis as a Valorization Route of Italian Green Pepper Waste to Delivery Free Sugars

Optimization of steam explosion parameters for improved biotechnological use of wheat straw

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