scholarly journals Microwave Assisted Alkali Pretreatment of Rice Straw for Enhancing Enzymatic Digestibility

2014 ◽  
Vol 2014 ◽  
pp. 1-7 ◽  
Author(s):  
Renu Singh ◽  
Sapna Tiwari ◽  
Monika Srivastava ◽  
Ashish Shukla
Keyword(s):  
Rice Straw ◽  
Energy Demand ◽  
Crystallinity Index ◽  
Composition Analysis ◽  
Renewable Energy Resources ◽  
Alkali Pretreatment ◽  
Enzymatic Digestibility ◽  
Sem Images ◽  
Microwave Assisted ◽  
Naoh Pretreatment

Rapid industrialization, increasing energy demand, and climate change are the conditions that forced the researchers to develop a clean, efficient, renewable, and sustainable source of energy which has a potential to replace fossil fuels. Ethanol is one of the attractive and suitable renewable energy resources. In present study, effectiveness of microwave pretreatment in combination with sodium hydroxide (NaOH) for increasing enzymatic hydrolysis of rice straw has been investigated and under optimum conditions obtained a maximum reducing sugar (1334.79 µg/mL) through microwave assisted NaOH pretreatment. Chemical composition analysis and scanning electron microscope (SEM) images showed that the removal of lignin, hemicellulose, and silicon content is more in microwave assisted NaOH pretreatment than the blank sample. X-ray diffraction (XRD) analysis revealed that the crystallinity index of rice straw treated with microwave assisted alkali (54.55%) is significantly high as compared to the blank (49.07%). Hence, the present study proves that microwave assisted alkali pretreatment can effectively enhance enzymatic digestibility of rice straw and it is feasible to convert rice straw for bioethanol production.

Study on the Rice Straw Pretreated with NaOH for Biogasification

2011 ◽  
Vol 197-198 ◽  
pp. 140-146
Author(s):  
Jia You Li ◽  
Xiao Mei Ye ◽  
Jian Xing Yu ◽  
Li Ling Cai ◽  
Shan Ming Ruan ◽  
...  
Keyword(s):  
Response Surface ◽  
Rice Straw ◽  
Surface Analysis ◽  
Treatment Time ◽  
Polynomial Equation ◽  
Ftir Analysis ◽  
Sem Images ◽  
Box Behnken Design ◽  
Naoh Pretreatment ◽  
Main Factors

In this study, Box-Behnken design (BBD) and response surface analysis (RSA) methodology were employed to plan experiments and optimize the NaOH pretreatment of rice straw. Experimental results showed that concentration of NaOH (CS), treatment time (TT) and ratio of rice straw with NaOH (RS) were main factors governing the biogasification of rice straw. The polynomial equation describing the biogasification as a simultaneous function of the CS, TT and RS was confirmed. The FTIR analysis and SEM images of straws further confirmed that NaOH could disrupt the silicified waxy surface, break down the lignin-hemicellulose complex and partially remove silicon and lignin from the pretreated rice straw.

scholarly journals Profiling of Chemical and Structural Composition of Lignocellulosic Biomasses in Tetraploid Rice Straw

Polymers ◽  
2020 ◽  
Vol 12 (2) ◽  
pp. 340
Author(s):  
Chen Chen ◽  
Zhixiong Chen ◽  
Jiajun Chen ◽  
Jiawei Huang ◽  
Huiling Li ◽  
...  
Keyword(s):  
Rice Straw ◽  
Lignin Content ◽  
Topological Analysis ◽  
Enzyme Reaction ◽  
Crystallinity Index ◽  
Cellulose Crystallinity ◽  
Sem Images ◽  
Enzyme Efficiency ◽  
G Ratio

The improvement of the saccharification of rice straw is one of the strategies to reduce the sophisticated pretreatment that results in high cost and is unfriendly to the environment. We explored the cell wall features in tetraploid rice and highlighted the enhanced saccharification of tetraploid with large biomass. Results showed that lignin content and S/G ratio reduced to 17.09% and 0.37, respectively, in tetraploid straw by the determination of the pyGC-MS method. After the pretreatment, the cellulose crystallinity index decreased from 63.22% to 57.65% in tetraploid straw, which is lower than that of pretreated diploid straw. Surface topological analysis of SEM images indicated that tetraploid straw was more susceptible to the pretreatment. Tetraploid straw showed a strong advantage in the process of enzymatic hydrolysis. The enzyme efficiency reached the highest value of 77.60%, and the rate of enzyme reaction was improved to make the reaction saturated earlier than conventional rice. We concluded that the high saccharification has resulted from the alteration of lignin and cellulose in tetraploid rice. Our research provides an improved green feedstock for bioenergy, and the tetraploid rice straw shows the potential utilization value in bioethanol production.

scholarly journals Optimization of alkali pretreatment to enhance rice straw conversion to butanol

2021 ◽  
Vol 150 ◽  
pp. 106131
Author(s):  
A. Valles ◽  
M. Capilla ◽  
F.J. Álvarez-Hornos ◽  
M. García-Puchol ◽  
P. San-Valero ◽  
...  
Keyword(s):  
Rice Straw ◽  
Alkali Pretreatment

Structure and Saccharification of Rice Straw Pretreated with Microwave-Assisted Dilute Lye

2012 ◽  
Vol 51 (17) ◽  
pp. 6270-6274 ◽  
Author(s):  
Feng-he Li ◽  
Hua-jia Hu ◽  
Ri-sheng Yao ◽  
Huai Wang ◽  
Man-man Li
Keyword(s):  
Rice Straw ◽  
Microwave Assisted

scholarly journals Microwave Assisted Chemical Pretreatment Method for Bio-ethanol Production from Rice Straw

2017 ◽  
Vol 29 (5) ◽  
pp. 943-950 ◽  
Author(s):  
Renu Singh ◽  
Monika Srivastava ◽  
Bharti Rohatgi ◽  
Abhijit Kar ◽  
Ashish Shukla
Keyword(s):  
Ethanol Production ◽  
Rice Straw ◽  
Chemical Pretreatment ◽  
Pretreatment Method ◽  
Microwave Assisted

scholarly journals Two-stage alkaline and acid pretreatment applied to sugarcane bagasse to enrich the cellulosic fraction and improve enzymatic digestibility

Detritus ◽  
2020 ◽  
pp. 106-113
Author(s):  
Longinus Ifeanyi Igbojionu ◽  
Cecilia Laluce ◽  
Edison Pecoraro
Keyword(s):  
Sugarcane Bagasse ◽  
Maleic Acid ◽  
Ethanol Yield ◽  
High Yield ◽  
Enzymatic Digestibility ◽  
Acid Pretreatment ◽  
Two Stage ◽  
Second Stage ◽  
One Stage ◽  
Naoh Pretreatment

Sugarcane bagasse (SB) is made up of cellulose (32-43%), hemicellulose (19-34%) and lignin (14-30%). Due to high recalcitrant nature of SB, pretreatment is required to deconstruct its structure and enrich the cellulosic fraction. A two-stage NaOH and maleic acid pretreatment was applied to SB to enrich its cellulosic fraction. SB used in the present study is composed of cellulose (40.4 wt%), hemicellulose (20.9 wt%), lignin (22.5 wt%) and ash (4.0 wt%). After one-stage NaOH pretreatment, its cellulosic fraction increased to 61.8 wt% and later increased to 80.1 wt% after the second-stage acid pretreatment. Lignin fraction decreased to 3.0 wt% after one-stage NaOH pretreatment and remained unaffected after the acid pretreatment step. Hemicellulose fraction decreased substantially after the second-stage pretreatment with maleic acid. Pretreated SB displayed high crystallinity index and improved enzymatic digestibility. Hydrolysates of pretreated SB contained very low amount of xylose and subsequent fermentation by Saccharomyces cerevisiae -IQAr/45-1 resulted to ethanol level of 8.94 g/L. Maximal ethanol yield of 0.49 g/g (95.8% of theoretical yield) and productivity of 0.28 g/L/h was attained. At the same time, biomass yield and productivity of 0.47 g/g and 0.27 g/L/h respectively were obtained. Two-stage NaOH and maleic acid pretreatment led to ~ two-fold increase in cellulosic fraction and enhanced the enzymatic digestibility of SB up to 70.4%. The resulted enzymatic hydrolysate was efficiently utilized by S. cerevisiae -IQAr/45-1 to produce high yield of ethanol. Thus, optimization of enzymatic hydrolysis at low enzyme loading is expected to further improve the process and reduce cost.

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