Pretreatment of straw for bioethanol production

Ibrahim, Hassan Al-Haj

doi:10.1016/j.egypro.2011.12.973

Cited by 41 publications

(26 citation statements)

References 36 publications

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“…However, the very small particles is a disadvantage because it leads to a high energy consumption in the milling phase. On the other hand, the additional elimination of lignin contributes significantly to the decrease of energy consumption [20].…”

Section: Scanning Electron Microscope (Sem) Analysismentioning

confidence: 99%

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) Analysismentioning

confidence: 99%

Production of Cellulosic Ethanol from Enzymatically Hydrolysed Wheat Straws

Ursachi

Gutt

2020

Applied Sciences

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“…Rice straw in particular has several characteristics that make it an attractive lignocellulosic material for bioethanol production, such as high cellulose and hemicellulose content that can be readily hydrolysed into fermentable sugars. The high ash and silica content of rice straw, however, makes the selection of an appropriate pretreatment technique a major challenge in developing an economically viable technology for bioethanol production [54].…”

Section: Industrial Applications Of Pyrolysismentioning

confidence: 99%

Introductory Chapter: Pyrolysis

Ibrahim¹

2020

Recent Advances in Pyrolysis

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“…In the literature, many methods for bioethanol production from different types of lignocellulosic biomass are presented, but information regarding the entire composition of the fermentation medium is not available. 7,9 Khattaket al 37 reported analyses regarding the content of ethanol, acetic acid and acetaldehyde in the fermentation broth during the SSF process of waste from beer fermentation broth (WBFB). In our previous studies, Dan et al 31 and Lazar et al 38 detailed two methods for bioethanol production from fir wood (acid hydrolysis and SSF method after autohydrolysis and chlorite delignification).…”

Section: Ssf Process By Accellerase 1500 Enzymes and S Cerevisiaementioning

confidence: 99%

“…Due to the different structure and composition of cellulose and hemicellulose, a special treatment of wood for their separation is necessary because the presence of lignin in the woody biomass composition can affect further processes and bioethanol yields. 7 The lignin is a valuable resource for the production of value-added compounds, such as additives, etc. The separation of lignin from wood before enzymatic hydrolysis can improve enzymatic hydrolysis yields.…”

Section: Introductionmentioning

confidence: 99%

Bioethanol Production From Abies Alba Wood Using Adaptive Neural Fuzzy Interference System Mathematical Modeling

Șenilă¹,

Costiug²,

Becze³

et al. 2020

Cellulose Chem. Technol.

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This study investigates bioethanol production from Abies alba wood. The wood was first autohydrolysed, then delignified and the remaining cellulose was used as substrate for simultaneous saccharification and fermentation processes. The influence of temperature (180, 190 and 200 °C) and pretreatment time (5, 10 and 15 min) on the fermentation medium products was studied. The maximal bioethanol content (52.0 g L -1 ) was obtained at a pretreatment temperature of 190 °C and pretreatment time of 10 min. The enzymatic hydrolysis and fermentation temperature was 38 °C for 72 h. The untreated, autohydrolysed and delignified wood was characterized by reflected light microscopy for morphological structure identification. The adaptive network-based fuzzy interference model (ANFIS) and the Gaussian membership function were used to reproduce the experimental results obtained for complete characterization of the wood fermentation broth. The proposed model uses two input variables (temperature and reaction time) and one output parameter based on two intelligent methods: back-propagation and a hybrid method. The hybrid intelligent method has good accuracy (99.2-100.0%) and correlation coefficient (0.998-1). The fermentation broth contains a mixture of bioethanol and secondary by-products, including acids, alcohols, aldehydes, ketones and esters. A maximum of 5.2 g bioethanol can be obtained from 100 g of woody biomass after autohydrolysisdelignification-SSF process.

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Pretreatment of straw for bioethanol production

Cited by 41 publications

References 36 publications

Production of Cellulosic Ethanol from Enzymatically Hydrolysed Wheat Straws

Production of Cellulosic Ethanol from Enzymatically Hydrolysed Wheat Straws

Introductory Chapter: Pyrolysis

Bioethanol Production From Abies Alba Wood Using Adaptive Neural Fuzzy Interference System Mathematical Modeling

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