Insight into Pretreatment Methods of Lignocellulosic Biomass to Increase Biogas Yield: Current State, Challenges, and Opportunities

Hernández‐Beltrán, Javier Ulises; Lira, Inty Omar Hernández-De; Cruz-Santos, Mónica María; Saucedo-Luevanos, Alexia; Hernández-Terán, Fernando; Balagurusamy, Nagamani

doi:10.3390/app9183721

Cited by 193 publications

(79 citation statements)

References 193 publications

(216 reference statements)

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“…In contrast, a decrease in methane yield was reported by Li et al [54] where a 13.8% drop in methane yield resulted from microwave treatment of Pennisetum hybrid grass at 1180 W, frequency 2450 MHz, and temperature up to 260 • C. MWP can generate inhibitory by-products such as HMF and furfural and cause losses of volatile and biodegradable matter due to exposure to the high microwave irradiation without temperature control especially in intense heating rate represented by high wattage and lack of sufficient liquid to distribute the heat [55,56]. These factors, solid to liquid ratio, exposure time, and microwave power, all constitute energy intensity.…”

Section: Difference In Biodegradability Of the Pretreated Grass Biomassmentioning

confidence: 99%

Comparing Low-Temperature Hydrothermal Pretreatments through Convective Heating versus Microwave Heating for Napier Grass Digestion

et al. 2020

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: This study investigates the effects of convective hydrothermal pretreatment (CHTP) compared to microwave pretreatment (MWP) on the anaerobic digestion of hybrid Napier grass for biomethane production. For rapid estimation of methane yield (YCH4), enzymatic hydrolyzability (EH), whose test lasts only 2 days was used as a surrogate parameter instead of the biochemical methane potential (BMP) assay that normally takes 45–60 days. The relationship between EH and BMP was successfully modeled with satisfactory accuracy (R2 = 0.9810). From CHTP results, quadratic regression characterised by p < 0.0001 and R2 = 0.8364 shows that YCH4 increase was clearly sensitive to detention time at all CHTP temperatures. The maximal YCH4 achieved of 301.5 ± 3.0 mL CH4/gVSadd was 53.2% higher than the control. Then, MWP was employed at various power levels and microwave exposure times. Changes in lignocellulosic structure by Fourier-transform infrared spectroscopy (FTIR) and energy balance demonstrate that MWP caused more damage to plant cells, which proved more effective than CHTP. In the best conditions, approximately 50% of energy was needed for MWP to achieve the equivalent improvement in YCH4. However, CHTP is a more suitable option since waste heat, i.e., from a biogas CHP (combined heat and power) unit, could be used, as opposed to the electricity required for MWP.

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Section: Difference In Biodegradability Of the Pretreated Grass Biomassmentioning

confidence: 99%

Comparing Low-Temperature Hydrothermal Pretreatments through Convective Heating versus Microwave Heating for Napier Grass Digestion

et al. 2020

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“…General chemical composition (as % of dry weight), and composition (%) of CHCl3-EtOH extractable compounds of olive stones (adapted from [27,29]). In addition to its main use being as biomass and fuel, olive stones are useful thanks to their physical properties and useful chemical components [30]. The three main components of lignocellulosic olives are interesting enough to be separated by fractionation.…”

Section: Olive Stones' Chemical Compositionmentioning

confidence: 99%

“…Physical, thermal, mechanical properties, tensile modulus [29] differential scanning calorimetry (DSC), thermogravimetric analysis (TGA) [27] Filler [30] Polyvinyl chloride (PVC) TGA In plastic-based materials [31] Polypropylene (PP)…”

Section: Thermoplastic Polymermentioning

confidence: 99%

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Olive Stones as Filler for Polymer-Based Composites: A Review

et al. 2021

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Olives’ consumption produces copious agricultural byproducts that have accompanied humanity for millennia, but the increasing worldwide production complicates its management. Most wastes are generated during olive oil production in form of olive stones and other lignocellulosic derivatives. Industrial processes of chemical or physical nature to recover economically compounds from biomass residues are costly, difficult, and non-environmentally friendly. Cellulose, hemicellulose, and lignin biopolymers are the principal components of olive stones, which present interesting qualities as lignocellulosic fillers in polymeric composites. This review will summarize examples of composites based on thermoplastic polymers, such as polystyrene (PS), polylactide (PLA), polyvinyl chloride (PVC), polypropylene (PP), and polycaprolactone (PCL); thermosetting resins (phenol-formaldehyde, unsaturated polyesters, and epoxy) and acrylonitrile butadiene rubber/devulcanized waste rubber (NBR/DWR) blends focusing on the fabrication procedures, characterization, and possible applications. Finally, thanks to the wide disparity in polymer matrix types, the variability in applications is important, from adsorption to mechanical enhancement, showing the easiness and benefit of olive stone integration in many materials.

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“…Other studies have reported that pretreatment of lignocellulosic biomass (LB) aids to overcome recalcitrance through the combination of chemical and structural changes to the lignin and carbohydrates. Some of the different methods of pretreatment include physical; namely, mechanical pretreatment, physicochemical; namely, steam explosion, chemical; namely, alkali and acidic pretreatment, and biological; namely, manure addition or mixed microorganisms [6,7]. Nonetheless, these traditional methods of pretreatment are cost-intensive, as additional chemicals or energy are required [8].…”

Section: Introductionmentioning

confidence: 99%

Valorization of Lignocellulosic and Microalgae Biomass

Armah¹,

Chetty²,

Adedeji³

et al. 2021

Biotechnological Applications of Biomass

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Lignocellulosic biomass has gained increasing recognition in the past decades for the production of value-added products (VAPs). Biomass feedstocks obtained from various sources, their composition, and pretreatment techniques employed for delignification into bioenergy production are discussed. The conversion processes of biomass into VAPs involve various methods. Notable among them are biochemical conversions; namely, anaerobic digestion and ethanol fermentation, and thermo-chemical conversions; namely, pyrolysis and gasification which are considered in this chapter. Microalgae can adapt to changes in the environment, producing biomass that serves as a precursor for a variety of biomolecules, such as proteins, which find their application in pharmaceutical, cosmetic, and biofuel industries. Suitable strains of freshwater microalgae biomass contain high levels of lipid which can be harnessed for bioenergy production. Hence, the advancement in the conversion of biomass into VAPs could help scientists and environmentalists for sustainable use of biomass in future developments.

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Insight into Pretreatment Methods of Lignocellulosic Biomass to Increase Biogas Yield: Current State, Challenges, and Opportunities

Cited by 193 publications

References 193 publications

Comparing Low-Temperature Hydrothermal Pretreatments through Convective Heating versus Microwave Heating for Napier Grass Digestion

Comparing Low-Temperature Hydrothermal Pretreatments through Convective Heating versus Microwave Heating for Napier Grass Digestion

Olive Stones as Filler for Polymer-Based Composites: A Review

Valorization of Lignocellulosic and Microalgae Biomass

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