Integrated hydrothermal and deep eutectic solvent-mediated fractionation of lignocellulosic biocomponents for enhanced accessibility and efficient conversion in anaerobic digestion. (May 2022)

• Record Type: Journal Article
• Authors: Basak, Bikram; Patil, Swapnil; Kumar, Ramesh; Ha, Geon-Soo; Park, Young-Kwon; Ali Khan, Moonis; Kumar Yadav, Krishna; Fallatah, Ahmed M.; Jeon, Byong-Hun
• Is Part Of: Bioresource technology. Volume 351(2022)
• Publication Date: 2022-05
• Subjects: Hydrothermal pretreatment -- Deep eutectic solvent -- Anaerobic digestion -- Biomass fractionation -- Lignocellulosic biomass; Biomass -- Periodicals; Biomass energy -- Periodicals; Bioremediation -- Periodicals; Agricultural wastes -- Periodicals; Factory and trade waste -- Periodicals; Organic wastes -- Periodicals; Bioénergie -- Périodiques; Déchets agricoles -- Périodiques; Déchets industriels -- Périodiques; Déchets organiques -- Périodiques; Déchets (Combustible) -- Périodiques; 662.88
• DOI: 10.1016/j.biortech.2022.127034
• Languages: English
• ISSNs: 0960-8524

Abstract

Graphical abstract: Highlights: Hydrothermal and deep eutectic solvent fractionate lignocellulosic (LC) components. Optimized hydrothermal process recovered 96% hemicellulose at a severity of 2.26. Deep eutectic solvent removed 81.3% of lignin after hemicellulose solubilization. Integrated process remarkably improved the digestion of fractionated LC-components. Acclimatized consortium rapidly removed LC-inhibitors, yielding 33.4% more methane. Abstract: Effective fractionation of lignocellulosic biocomponents of lignocellulosic biomass can increase its utilization in anaerobic digestion for high yield biomethane production. A hydrothermal process was optimized and integrated with a deep eutectic solvent (DES) pretreatment to preferentially fractionate hemicellulose, cellulose, and lignin in rice straw. The optimized hydrothermal process resulted in 96% hemicellulose solubilization at moderately low combined pretreatment severity (log S = 2.26), allowing increased hemicellulosic sugar recovery with minimal formation of inhibitory byproducts. Subsequent DES pretreatment resulted in highly bioaccessible cellulosic pulp, removing 81.3% of lignin that can be recovered and converted into value-added products. Anaerobic digestion of hemicellulosic fraction and cellulosic pulp using a microbial methanogenic consortium seed acclimatized to the lignocellulosic inhibitors resulted in a 33.4% higher yield of methane (467.84 mL g −1 VSinitial ) than with anaerobic digester sludge seed. This integrated approach can facilitate and maximize the targeted utilization of different biocomponents through sustainable biorefining.