Delignification of Rice Husk by Microwave Assisted Chemical Pretreatment

Laghari, Shuaib M.; Tunio, M. M.; Laghari, Abdul Qadeer; Laghari, A. J.; Ali, Akbar

doi:10.48084/etasr.2143

Cited by 8 publications

(7 citation statements)

References 21 publications

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“…Vasconcelos et al studied a sugarcane biomass pretreatment with diluted H 3 PO 4 , and the maximum saccharification was recorded during the pretreatment at 186°C for 8 min [44]. Kaur and Phutela [45], Lag et al [46], and Binod et al [27] also noted an increase in the release of sugars after microwave treatments of paddy straw, coconut husks, and sugarcane, respectively. When deploying thermal hydrolysis, attention should be paid to the possibility of adverse effects, such as the production of phenolic and furan compounds that elicit toxic effects and inhibit the growth of methanogenic bacteria [47].…”

Section: Resultsmentioning

confidence: 99%

Progress in the Production of Biogas from Maize Silage after Acid-Heat Pretreatment

et al. 2021

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One of the most effective technologies involving the use of lignocellulosic biomass is the production of biofuels, including methane-rich biogas. In order to increase the amount of gas produced, it is necessary to optimize the fermentation process, for example, by substrate pretreatment. The present study aimed to analyze the coupled effects of microwave radiation and the following acids: phosphoric(V) acid (H3PO4), hydrochloric acid (HCl), and sulfuric(VI) acid (H2SO4), on the destruction of a lignocellulosic complex of maize silage biomass and its susceptibility to anaerobic degradation in the methane fermentation process. The study compared the effects of plant biomass (maize silage) disintegration using microwave and conventional heating; the criterion differentiating experimental variants was the dose of acid used, i.e., 10% H3PO4, 10% HCl, and 10% H2SO4 in doses of 0.02, 0.05, 0.10, 0.20, and 0.40 g/gTS. Microwave heating caused a higher biogas production in the case of all acids tested (HCl, H2SO4, H3PO4). The highest biogas volume, exceeding 1800 L/kgVS, was produced in the variant with HCl used at a dose of 0.4 g/gTS.

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Section: Resultsmentioning

confidence: 99%

Progress in the Production of Biogas from Maize Silage after Acid-Heat Pretreatment

et al. 2021

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“…Meanwhile, the thermal pre-treatment was carried out by using an autoclave with a temperature of 121 o C and pressure of 15 psi for 2 hours. The same combination of the pre-treatment methods was done by Laghari et al [15] with rice husks that had been ground until 1 mm in size. The optimum conditions for the rice husk pre-treatment were obtained after the thermal pre-treatment using a microwave and continued with the chemical pre-treatment using solution of NaOH 3.5%.…”

Section: Resultsmentioning

confidence: 99%

Optimisation of Rice Husks’ Lignocellulose Pre-Treatment Methods and Use of Central Composite Design in Citric Acid Fermentation: A Review

Samosir¹,

Sariati²,

Sitepu³

et al. 2022

IOP Conf. Ser.: Earth Environ. Sci.

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In today’s industry, about 80% to 90% of citric acid (C6H8O7) production is carried out using submerged fermentation method and Aspergillus niger as citric acid producing microorganism. The use of fermentation method provides advantages, including the utilization of agricultural waste as substrate. Rice husks can be used as substrate in citric acid fermentation because they contain high cellulose and hemicellulose. However, agricultural waste also contains lignin which can interfere with the hydrolysis of cellulose and hemicellulose into reducing sugars, therefore optimisation of pre-treatment process is needed to separate lignin in rice husk. In addition to the optimisation of pre-treatment process, optimisation of fermentation parameter variations to obtain maximum citric acid yield is necessary. Therefore, the aim of this narrative review is to desribe various pre-treatment methods that can be done to remove lignin from rice husks, and to provide information on the benefits of using the Central Composite Design method in the optimisation of various fermentation parameters.

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“…Park et al (2015) delignified mixed hardwood chip powder through conventional hot water bath bleaching using 41% sodium chlorite with a percentage delignification of about 77% albeit addition of five to six charges each hour. Laghari et al (2018) found that on subjecting rice husk to microwaveassisted chemical treatment (with sodium hydroxide, sodium carbonate, hydrogen peroxide and sulfuric acid) the delignification percentage increased by increasing the concentration from 2 to 5%, except for sodium hydroxide where the maximum delignification of about 43% was seen at 3.5% concentration and this being highest of all the treatments. Thus, in the present study, a clear reflection of a synergistic effect on the increase in delignification percentage due to application microwaves and increased concentration of sodium chlorite is seen.…”

Section: Effect On Microwave Power Irradiation Time and Bleaching Solution Concentration On The Delignification Of Rice Strawmentioning

confidence: 97%

“…The results confirmed the disruption of lignin-carbohydrate complex and effective delignification due to application of microwaves. Also, delignification of rice husk by microwave-assisted treatment at 240 watts resulted in almost 30% delignification in just 5 minutes (Laghari et al, 2018). The effect of microwaves is due to the enhanced cell wall rupture and subsequent diffusion caused by unidirectional inside out heat and mass transfers (Veggi et al, 2013).…”

Section: Effect On Microwave Power Irradiation Time and Bleaching Solution Concentration On The Delignification Of Rice Strawmentioning

confidence: 99%

Influence of microwave-assisted chemical treatment on delignification of rice straw biomass

Bhat

Shahi

Lohani

et al. 2021

ECJ

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Lignocellulosic biomass (like rice straw) provides an alternative for depleting non-renewable energy sources through its value-added utilization (like production of biofuels and nanocellulose) owing to its abundance, renewability, polymer presence and environmental friendliness. Prior to its utilization, any lignocellulosic biomass is subjected to a time-consuming delignification process for lignin free biomass recovery. The present study aims to reduce the time of delignification of rice straw along with enhancing the delignification percentage of biomass by use of microwave assisted sodium chlorite method. The experiments were done at two microwave power levels (640, 800 W), three bleaching solution concentrations (0.4, 1.7, 3.0 %) and three microwave treatment times (4, 8, 12 min). The delignification percentage of the rice straw for the whole experimentation varied from 24.7 to 90.12%. The results revealed that the time of delignification was greatly reduced (12 min) with a very high delignification (90.12%) percentage. The morphology of the delignified samples also revealed the deconstruction of the lignin structure. The improved method can thus be applied for the delignification of other biomasses as well for quick and effective delignification

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Delignification of Rice Husk by Microwave Assisted Chemical Pretreatment

Cited by 8 publications

References 21 publications

Progress in the Production of Biogas from Maize Silage after Acid-Heat Pretreatment

Progress in the Production of Biogas from Maize Silage after Acid-Heat Pretreatment

Optimisation of Rice Husks’ Lignocellulose Pre-Treatment Methods and Use of Central Composite Design in Citric Acid Fermentation: A Review

Influence of microwave-assisted chemical treatment on delignification of rice straw biomass

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