Effect of ultrasonic application during KOH pretreatment and anaerobic process on digestion performance of wheat straw

Korai, Rashid Mustafa; Wachemo, Akiber Chufo; Liu, Yue; Jaffar, M.; Li, Zhengwei; Shahbaz, Muhammad; Yuan, Hairong

doi:10.1039/d0ra00525h

Cited by 10 publications

(5 citation statements)

References 42 publications

(41 reference statements)

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“…However, to make the process economically viable, the selectivity must be increased, the pretreatment time reduced, and the chemicals recycled [ 41 , 45 ]. Furthermore, by separate usage or combining the alkaline treatment with physical techniques, such as microwave [ 46 , 47 , 48 , 49 ], ultrasound irradiation [ 18 , 19 , 41 , 49 , 50 , 51 ], or freeze–thaw (FT) cycles [ 44 , 47 , 52 ], the alkaline extraction can be improved even further taking into account the final objectives.…”

Section: Introductionmentioning

confidence: 99%

Optimization of Alkaline Extraction of Xylan-Based Hemicelluloses from Wheat Straws: Effects of Microwave, Ultrasound, and Freeze–Thaw Cycles

et al. 2023

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The alkaline extraction of hemicelluloses from a mixture of three varieties of wheat straw (containing 40.1% cellulose, 20.23% xylan, and 26.2% hemicellulose) was analyzed considering the following complementary pre-treatments: freeze–thaw cycles, microwaves, and ultrasounds. The two cycles freeze–thaw approach was selected based on simplicity and energy savings for further analysis and optimization. Experiments planned with Design Expert were performed. The regression model determined through the response surface methodology based on the severity factor (defined as a function of time and temperature) and alkali concentration as variables was then used to optimize the process in a multi-objective case considering the possibility of further use for pulping. To show the properties and chemical structure of the separated hemicelluloses, several analytical methods were used: high-performance chromatography (HPLC), Fourier-transformed infrared spectroscopy (FTIR), proton nuclear magnetic resonance spectroscopy (1H-NMR), thermogravimetry and derivative thermogravimetry analysis (TG, DTG), and scanning electron microscopy (SEM). The verified experimental optimization result indicated the possibility of obtaining hemicelluloses material containing 3.40% glucan, 85.51% xylan, and 7.89% arabinan. The association of hot alkaline extraction with two freeze–thaw cycles allows the partial preservation of the hemicellulose polymeric structure.

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Section: Introductionmentioning

confidence: 99%

Optimization of Alkaline Extraction of Xylan-Based Hemicelluloses from Wheat Straws: Effects of Microwave, Ultrasound, and Freeze–Thaw Cycles

et al. 2023

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“…These results are very consistent with those of other scientific articles. Korai et al 60 . found values of 30.31 for the WS samples.…”

Section: Resultsmentioning

confidence: 93%

“…The mixtures with WS, on the other hand, generated little methane. According to Korai et al ., 60 the biodegradation of some samples of agricultural waste, especially WS, usually affects the AD of some substrates. Certain effects are usually due to the hydrophobic bonds between lignin and hemicellulose, limiting the access of anaerobic microorganisms to the organic portion of the biomass 76 …”

Section: Resultsmentioning

confidence: 99%

Effect of the co‐digestion of agricultural lignocellulosic residues with manure from South American camelids

Meneses-Quelal

Gaibor‐Chávez

Niño

2021

Biofuels Bioprod Bioref

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This study aims to evaluate the effects of the co‐digestion of agricultural residues with manure from camelids from the Andean zone. Different combinations of llama manure (LM) and vicuñas (VM) were made with amaranth (AS), quinoa (QS), and wheat (WS) residues. They were fermented using sewage sludge as inoculum. The co‐digestion was evaluated under mesophilic conditions for 40 days. The ratios of volatile substances of substrate / co‐substrate evaluated were 0:100; 25:75; 50:50, 75:25, and 100:0. Two substrate / inoculum ratios (SIR 1:1 and SIR1:2) were also evaluated. The results indicate that the maximum methane accumulation rate is obtained in SIR 1:1 for a VM‐AS ratio (25:75) with 540 mL/g volatile solid (VS). In general, the results did not increase with the increase in inoculum; rather, the tendency to improve methane yield is associated with an increase in the amount of agricultural residues, mainly AS. Regarding the kinetic modeling, the transfer model is the one that best adjusted the predicted values to those observed with an r2 between 0.991 and 0.999, and an RMSE value between 2.06 and 13.62 mL/g (volatile solid) VS. Finally, all the trials presented synergistic effects in their co‐digestion except the digesters formed by LM‐AS, LM‐QS and LM‐WS of SIR 1:2. These presented antagonistic effects in which the addition of the co‐substrate generated competition with the substrates, reducing methane production. © 2021 Society of Chemical Industry and John Wiley & Sons, Ltd

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“…The pretreatment process of lignocellulose facilitate to open the structure of lignocellulose thus cellulose becomes more accessible by enzymes that break down polysaccharide polymers into monomer forms [15]. Some pretreatments that have been studied are ultrasound pretreatment [16,17], ligninolytic fungi or bacteria [18,19], alkaline or acid pretreatment [20], microwaveassisted alkalization and acid oxidation [21,22]. Microwave-assisted alkali pretreatment is 1 of alternative to break down lignocellulose structure.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Microwave-Assisted Alkali and Xanthomonas t ranslucens ICBB 9762 for Rice Straw Pretreatment on Electricity Generation of Microbial Fuel Cell Inoculated by Staphylococcus saprophyticus ICBB 9554

Khoirunnisa

Anwar

Santosa³

2021

Trends Sci

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Rice straw can be utilized as an organic substrate in Microbial Fuel Cell (MFC) to generate electricity by microbes as a biocatalyst. This research was aimed to observe the effect of Xanthomonas translucens ICBB 9762 inoculation pretreatment on microwave-assisted alkali treated rice straw on the lignocellulosic structure change of rice straw and to observe the performance of MFC system fed by treated rice straw. The stages of research included: (1) pretreatment of rice straw through microwave-assisted alkali and Xanthomonas translucens ICBB 9762 inoculation, (2) observation of MFC performance including electrical voltage; electrical current; power density; and Coulombic efficiency, and (3) anolite analysis including COD removal, pH and Eh. The result showed that rice straw was successfully decomposed by inoculation of Xanthomonas translucens ICBB 9762 on microwave-assisted alkali pretreatment which the highest cellulose yield about 29.36 %. Treated rice straw produced better performance than rice straw without pretreatment which the best performance resulted by the combination of Xanthomonas translucens ICBB 9762 inoculation and microwave-assisted alkali pretreatment which produce electrical voltage, electrical current, and power density value of 337.90 mV, 0.39 mA, and 26.20 mW/m2, respectively. The utilization of solid substrate such as rice straw need more attention due to there was COD enhancement while in COD reduction reach COD removal efficiency and coulombic efficiency ranged 5.15 - 54.08 % and 0.25 - 7.83 %, respectively. HIGHLIGHTS Microbial Fuel Cell fueled by lignocellulose substrate, which is rice straw Lignocellulose structure deconstruction through microwave-assisted alkali pretreatment A combination of microwave-assisted alkali and cellulose-degrading bacteria inoculation pretreatment for rice straw generate the highest electricity Electricity generation improvement in microbial fuel cell through mix culture between cellulose-degrading bacteria and exoelectrogen bacteria Cellulose degrading bacteria increase Chemical Oxygen Demand (COD) due to the solubility of low molecular weight organic compounds increasing during microbial fuel cell incubation

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Effect of ultrasonic application during KOH pretreatment and anaerobic process on digestion performance of wheat straw

Abstract: The effect of ultrasonic application during KOH pretreatment and anaerobic digestion of wheat straw.

Cited by 10 publications

References 42 publications

Optimization of Alkaline Extraction of Xylan-Based Hemicelluloses from Wheat Straws: Effects of Microwave, Ultrasound, and Freeze–Thaw Cycles

Optimization of Alkaline Extraction of Xylan-Based Hemicelluloses from Wheat Straws: Effects of Microwave, Ultrasound, and Freeze–Thaw Cycles

Effect of the co‐digestion of agricultural lignocellulosic residues with manure from South American camelids

The Effect of Microwave-Assisted Alkali and Xanthomonas t ranslucens ICBB 9762 for Rice Straw Pretreatment on Electricity Generation of Microbial Fuel Cell Inoculated by Staphylococcus saprophyticus ICBB 9554

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