Material flow of cellulose in rice straw to ethanol and lignin recovery by NaOH pretreatment coupled with acid washing

2021 ◽  
Author(s):  
Wara Samar ◽  
Anju Arora ◽  
Anubha Sharma ◽  
Shalley Sharma ◽  
Preeti Nandal
Keyword(s):  
Rice Straw ◽  
Material Flow ◽  
Naoh Pretreatment ◽  
Acid Washing ◽  
Lignin Recovery

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.

Experiments on Anaerobic Digestion of Rice Straw for Biogas Production under NaOH Pretreatment

2014 ◽  
Vol 953-954 ◽  
pp. 220-223
Author(s):  
Ben Lin Dai ◽  
An Feng Zhu ◽  
Fei Hu Mu ◽  
Ning Xu ◽  
Zhen Wu
Keyword(s):  
Anaerobic Digestion ◽  
Rice Straw ◽  
Biogas Production ◽  
Laboratory Scale ◽  
Biogas Slurry ◽  
Naoh Pretreatment ◽  
Pretreatment Technology ◽  
Peak Value

To discuss the effect of NaOH pretreatment technology for biogas production and methane (CH4) content enhancement during the anaerobic digestion of rice straw waste, a self-designed laboratory-scale continuous anaerobic biogas digester was used in this study. Anaerobic biogas slurry, NaOH pretreatment and anaerobic digestion were evaluated for biogas production from rice straw. The results showed that the peak value of biogas production was attained on the 16th day by using 6% NaOH pretreatment on rice straw. However, the highest CH4 content was 60.8% on the 24th day for the 4% NaOH-treated rice straw. The cumulative biogas production of 6% NaOH pretreatment was the highest, about 18 720 mL, which was followed by 8% NaOH (15 057 mL), 4% NaOH (12 103 mL), and 2% NaOH (10 754 mL).

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.

Synergistic effect of alkaline pretreatment and magnetite nanoparticle application on biogas production from rice straw

2018 ◽  
Author(s):  
Muhammad Junaid Khalid
Keyword(s):  
Rice Straw ◽  
Biogas Production ◽  
Maximum Yield ◽  
Alkaline Pretreatment ◽  
Methane Yield ◽  
Magnetite Nanoparticle ◽  
Energy Assessment ◽  
Naoh Pretreatment ◽  
Magnetite Fe3o4 ◽  
Production Complex

Agricultural residues have high potential for biogas production, complex lignocellulosic structure is however the main hindrance in their bioconversion. This research focuses on combined effect of alkaline pretreatment of rice straw and magnetite (Fe3O4) nanoparticle application. Four doses of magnetite nanoparticles viz. 60, 80, 100 and 120 ppm were used in the anaerobic digestion of untreated and 2% NaOH pretreated rice straw. Compared to control, 2% NaOH pretreatment alone increased biogas and methane yield by 57 and 60% respectively. Magnetite nanoparticle (MNP) application alone gave maximum yield at 100 ppm which consisted of 37 and 33% more biogas and methane yield respectively. Combining the effect of 2% NaOH pretreatment and 120 ppm MNPs synergistically increased biogas and methane yield by 100 and 129% as compared to control. In addition, an energy assessment indicated a positive net gain of 3765 kJ for 2% NaOH pretreated rice straw with 120 ppm MNPs.

Effect of Two Mild Alkaline Oxidative Pretreaments of Rice Straw on Enzymatic Hydrolysis

2011 ◽  
Vol 396-398 ◽  
pp. 1636-1639 ◽  
Author(s):  
Hui Yong Li ◽  
Ke Long Huang ◽  
Mi Jin ◽  
Qin Qin Wei ◽  
Zhi Guang Li
Keyword(s):  
Enzymatic Hydrolysis ◽  
Rice Straw ◽  
Conversion Yield ◽  
Naoh Pretreatment ◽  
Speed Up

Two mild alkaline oxidative pretreatments of rice straw followed by enzymatic hydrolysis were investigated. In addition to measuring the composition variance, the pretreated rice straw solutions were analysed by the UV/Vis spectra. These two mild oxidative pretreatment of rice straw cause the removal of lignin, hemicellulose and neutral detergent solubles (NDS), where the H2O2/NaOH pretreatment solubilize the lignin and the O3/NaOH pretreatment oxidative degrade the lignin. These two mild oxidative pretreatment of rice straw enhance susceptibility to enzymatic hydrolysis, and speed-up the enzymatic hydrolysis. The conversion yield of cellulose and hemicellulose presented in the O3/NaOH pretreated rice straw was 92.6%, compared to 82.3% and 52.5% in the H2O2/NaOH pretreated and untreated rice straw, respectively.

Effect of thermal treatment on Egyptian rice straw hardboard

1977 ◽  
Vol 27 (1) ◽  
pp. 93-98
Author(s):  
Naim A. Fadl ◽  
Magdi Z. Sefain ◽  
Mohomed Rakha
Keyword(s):  
Thermal Treatment ◽  
Rice Straw
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