Decoupling thermal and non-thermal effects of the microwaves for lignocellulosic biomass pretreatment

Bichot, Aurélie; Lerosty, Mickaël; Radoiu, Marilena; Méchin, Valérie; Bernet, Nicolas; Delgenès, Jean-Philippe; García-Bernet, Diana

doi:10.1016/j.enconman.2019.112220

Cited by 68 publications

(18 citation statements)

References 25 publications

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“…27 As shown in Table 1, both reducing sugar yield and saccharification efficiency increased significantly with the increase in solid-to-liquid ratio from 1:5 to 1:15, and the maximal reducing sugar yield and saccharification efficiency reached 17.02 g/100 g and 33.59%, respectively, at a solid-to-liquid ratio of 1:15. Bichot et al 28 pointed out that the solid-to-liquid ratio is an important parameter during the microwave treatment as it is difficult to heat matter with a low water content. If the polar liquid content is less than 20% (w/w) in the reaction vessel, then motion of polar molecules, according to oscillating waves, is impossible.…”

Section: Resultsmentioning

confidence: 99%

Enhancing the Enzymatic Saccharification of Grain Stillage by Combining Microwave-Assisted Hydrothermal Irradiation and Fungal Pretreatment

et al. 2020

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Grain stillage from the liquor industry was pretreated by using microwave-assisted hydrothermal pretreatment, fungal pretreatments, and their combination to enable efficient enzymatic hydrolysis for sugar production. The microwave-assisted hydrothermal (MH) pretreatment was optimized by using a response surface methodology, and the respective maximum reducing sugar yield and saccharification efficiency of 17.59 g/100 g and 33.85%, respectively, were achieved under the pretreatment conditions of microwave power = 120 W, solidto-liquid ratio = 1:15 (g•mL −1 ), and time = 3.5 min. The fungal pretreatment with Phanerochaete chrysosporium digestion (PC) achieved the maximum ligninolytic enzyme activities in 6 days with 10% inoculum size at which the reducing sugar yield and saccharification efficiency reached 19.74 g/100 g and 36.29%, respectively. To further improve the pretreatment efficiency, MH and PC pretreatments were combined, but the sequence of MH and PC mattered on the saccharification efficiency. The MH + PC pretreatment (the MH prior to the PC) was better than PC + MH (the PC prior to the MH) in terms of saccharification efficiency. Overall, the MH + PC pretreatment achieved superior reducing sugar yield and saccharification efficiency (25.51 g/100 g and 66.28%, respectively) over all other studied pretreatment methods. The variations of chemical compositions and structure features of the raw and pretreated grain stillage were characterized by using scanning electron microscopy and Fourier transform infrared spectroscopy. The results reveal that both MH and PC pretreatments mainly functioned on delignification and decreasing cellulose crystallinity, thus enhancing the enzymatic saccharification of the pretreated grain stillage. The combined MH and PC pretreatment could be a promising method to enable cost-efficient grain stillage utilization for downstream applications such as biofuels.

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Section: Resultsmentioning

confidence: 99%

Enhancing the Enzymatic Saccharification of Grain Stillage by Combining Microwave-Assisted Hydrothermal Irradiation and Fungal Pretreatment

et al. 2020

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“…Genetic studies have proven an influence of the microwave radiation on bacterial community variety [43,44]. Other investigations confirm the presence of non-thermal effects of microwaves [45,46]. An interesting issue, rarely analyzed, is the use of microwaves for reactors' heating and intensification of biochemical changes in anaerobic digestion.…”

Section: Introductionmentioning

confidence: 99%

Microwave Radiation Influence on Dairy Waste Anaerobic Digestion in a Multi-Section Hybrid Anaerobic Reactor (M-SHAR)

2021

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Whey is a primary by-product of dairy plants, and one that is often difficult to manage. As whey processing units are costly and complicated, only 15–20% of whey is recycled for use in the food industry. The difficulties in managing waste whey are particularly pronounced for small, local dairy plants. One possible solution to this problem is to use advanced and efficient digesters. The aim of this study was to present an innovative multi-section hybrid anaerobic bioreactor (M-SHAR) design and to identify how microwave radiation heating (MRH) affects methane fermentation of liquid dairy waste (LDW) primarily composed of acid whey. The MRH reactor was found to perform better in terms of COD removal and biogas production compared with the convection-heated reactor. The heating method had a significant differentiating effect at higher organic load rates (OLRs). With OLRs ranging from 15 to 25 kgCOD∙m−3∙d−1, the M-SHAR with MRH ensured a 5% higher COD removal efficiency and 12–20% higher biogas yields.

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“…14,15 Among these technologies, the microwave pretreatment method is an efficient heating treatment which can shorten the processing time and consume less energy because of the thermal and non-thermal effects elicited by the radiation in the presence of water. 16 Thermal effects embody the generation of internal heat by radiation due to the local temperature rise, which results in so-called rapid local heating. 17 Conversely, non-thermal effects include the oscillation of polar bonds, which further leads to the fracture of bonds and the acceleration of chemical and physical processes.…”

Section: Introductionmentioning

confidence: 99%

The solid-state physicochemical properties and biogas production of the anaerobic digestion of corn straw pretreated by microwave irradiation

et al. 2021

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Decoupling thermal and non-thermal effects of the microwaves for lignocellulosic biomass pretreatment

Cited by 68 publications

References 25 publications

Enhancing the Enzymatic Saccharification of Grain Stillage by Combining Microwave-Assisted Hydrothermal Irradiation and Fungal Pretreatment

Enhancing the Enzymatic Saccharification of Grain Stillage by Combining Microwave-Assisted Hydrothermal Irradiation and Fungal Pretreatment

Microwave Radiation Influence on Dairy Waste Anaerobic Digestion in a Multi-Section Hybrid Anaerobic Reactor (M-SHAR)

The solid-state physicochemical properties and biogas production of the anaerobic digestion of corn straw pretreated by microwave irradiation

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