Microwave irradiation – A green and efficient way to pretreat biomass

Li, Hongqiang; Qu, Yanbin; Yang, Yongqing; Chang, Senlin; Xu, Jian

doi:10.1016/j.biortech.2015.08.099

Cited by 192 publications

(74 citation statements)

References 61 publications

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“…Microwave irradiation was categorized into atmospheric and high-pressure treatment. High-pressure microwave pretreatments are operated in closed reactors within the temperature range from 150 to 250 • C (Li H. et al, 2016). A study on the microwave pretreatment of Panicum spp.…”

Section: Microwave Assisted Size Reductionmentioning

confidence: 99%

Recent Trends in the Pretreatment of Lignocellulosic Biomass for Value-Added Products

et al. 2018

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Lignocellulosic biomass (LCB) is the most abundantly available bioresource amounting to about a global yield of up to 1. 3 billion tons per year. The hydrolysis of LCB results in the release of various reducing sugars which are highly valued in the production of biofuels such as bioethanol and biogas, various organic acids, phenols, and aldehydes. The majority of LCB is composed of biological polymers such as cellulose, hemicellulose, and lignin, which are strongly associated with each other by covalent and hydrogen bonds thus forming a highly recalcitrant structure. The presence of lignin renders the bio-polymeric structure highly resistant to solubilization thereby inhibiting the hydrolysis of cellulose and hemicellulose which presents a significant challenge for the isolation of the respective bio-polymeric components. This has led to extensive research in the development of various pretreatment techniques utilizing various physical, chemical, physicochemical, and biological approaches which are specifically tailored toward the source biomaterial and its application. The objective of this review is to discuss the various pretreatment strategies currently in use and provide an overview of their utilization for the isolation of high-value bio-polymeric components. The article further discusses the advantages and disadvantages of the various pretreatment methodologies as well as addresses the role of various key factors that are likely to have a significant impact on the pretreatment and digestibility of LCB.

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Section: Microwave Assisted Size Reductionmentioning

confidence: 99%

Recent Trends in the Pretreatment of Lignocellulosic Biomass for Value-Added Products

et al. 2018

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“…Cellulose content in the solid residue after pretreatment was found to be 47.3% (w/w) (corresponding to a cellulose recovery of 83.5%), while approximately 82% of hemicellulose was removed. When the heating source of hydrothermal pretreatment is changed to microwave irradiation (MWI) in the presence or absence of an acid catalyst (usually sulfuric acid, acetic acid or phosphoric acid), it could be considered as microwave or microwave-assisted acid pretreatment [25]. Approximately 58.5% of hemicellulose was removed after MWI pretreatment (210 • C for 10 min) in the presence of 2% w/w H 2 SO 4 while lignin remained in the solid residue.…”

Section: Composition Of Native and Pretreated Csmentioning

confidence: 99%

Effect of Various Pretreatment Methods on Bioethanol Production from Cotton Stalks

et al. 2019

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Cotton stalks (CS) are considered a good candidate for fuel-ethanol production due to its abundance and high carbohydrate content, but the direct conversion without pretreatment always results in extremely low yields due to the recalcitrant nature of lignocelluloses. The present study was undertaken to investigate the effect of various chemical and physicochemical pretreatment methods, i.e., alkali, microwave-assisted acid, organosolv, hydrothermal treatment, and sequentially organosolv and hydrothermal pretreatment, on chemical composition of CS and subsequent ethanol production applying pre-hydrolysis and simultaneous saccharification and fermentation (PSSF) at high solid loading. The best results in terms of ethanol production were achieved by the sequential combination of organosolv and hydrothermal pretreatment (32.3 g/L, using 15% w/v substrate concentration and 6 h pre-hydrolysis) with an improvement of 32% to 50% in ethanol production compared to the other pretreatments. Extending pre-hydrolysis time to 14 h and increasing substrate concentration to 20% w/v, ethanol production reached 47.0 g/L (corresponding to an ethanol yield of 52%) after 30 h of fermentation.

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“…Many studies cite energy efficiency as an advantage of microwave heating, however the energy input required to heat a given quantity of biomass will be the same, regardless of whether MW or conventional heating methodologies are used [31][32][33]. Volumetric heating allows conventional heat transfer limitations to be overcome, resulting in much higher heating rates, smaller processing equipment and the ability to process large particle sizes [27,33].…”

Section: Microwave Heating -The Fundamentalsmentioning

confidence: 99%

The application of microwave heating in bioenergy: A review on the microwave pre-treatment and upgrading technologies for biomass

Kostas

Beneroso

Robinson

2017

Renewable and Sustainable Energy Reviews

253

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Bioenergy, derived from biomass and/or biological (or biomass-derived) waste residues, has been acknowledged as a sustainable and clean burning source of renewable energy with the potential to reduce our reliance on fossil fuels (such as oil and natural gas). However, many bioenergy processes require some form of pre-treatment and/or upgrading procedure for biomass to generate a modified residue with more suitable properties and render it more compatible with the specific energy conversion route chosen. Many of these pre-treatments (or upgrading procedures) involve some form of substantive heating of the biomass to achieve this modification. Microwave (MW) heating has attracted much attention in recent years due to the advantages associated with dielectric heating effects. These advantages include rapid and efficient heating in a controlled environment, increasing processing rates and substantially shortening reaction times by up to 80%. However, despite this interest, the growth of industrial MW heating applications for bioenergy production has been hindered by a lack of understanding of the fundamentals of the MW heating mechanism when applied to biomass and waste residues. This article presents a review of the current scientific literature associated with the application of microwave heating for both the pre-treatment and upgrading of various biomass feedstocks across different bioenergy conversion pathways including thermal and biochemical processes. The fundamentals behind microwave heating will be explained, as well as discussion of the imperative areas which require further research and development to bridge the gap between fundamental science in the laboratory and the successful application of this technology at a commercial scale.

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Microwave irradiation – A green and efficient way to pretreat biomass

Cited by 192 publications

References 61 publications

Recent Trends in the Pretreatment of Lignocellulosic Biomass for Value-Added Products

Recent Trends in the Pretreatment of Lignocellulosic Biomass for Value-Added Products

Effect of Various Pretreatment Methods on Bioethanol Production from Cotton Stalks

The application of microwave heating in bioenergy: A review on the microwave pre-treatment and upgrading technologies for biomass

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