New trends in biogas production and utilization

Grangeiro, Luana Cardoso; Almeida, Sâmilla Gabriella Coêlho de; Mello, Bruna Sampaio de; Fuess, Lucas Tadeu; Sarti, Arnaldo; Dussán, Kelly J.

doi:10.1016/b978-0-12-817654-2.00007-1

Cited by 18 publications

(5 citation statements)

References 106 publications

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“…Organosolv pretreatment is not an exception and could represent a high-value opportunity to overcome biomass recalcitrance and recover relatively pure lignin with high yield [15,16]. Organosolv is a chemical treatment that uses numerous organic or aqueous solvent mixtures to solubilize lignin and hemicellulose, yielding a cellulose-rich residue with increased accessibility to hydrolytic enzymes [17].…”

Section: Introductionmentioning

confidence: 99%

Fractionation of Cynara cardunculus L. by Acidified Organosolv Treatment for the Extraction of Highly Digestible Cellulose and Technical Lignin

et al. 2021

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One of the primary targets for the new lignocellulosic feedstock-based biorefinery is the simultaneous valorization of holocellulose and lignin. Acidified organosolv treatment is among the most promising strategy for recovering technical lignin, water-soluble hemicellulose, and cellulose pulp with increased accessibility to hydrolytic enzymes. In this work, a design-of-experiment (DoE) approach was used to increase the cellulose recovery, digestibility, and the delignification of Cynara cardunculus L. feedstock. In the first treatment, the milled biomass was subjected to microwave-assisted extraction using an acidified GVL/water mixture to separate lignin and hemicellulose from cellulose. In the second treatment, the cellulose pulp was hydrolyzed by cellulolytic enzymes to demonstrate the enhanced digestibility. At the optimal condition (154 °C, 2.24% H2SO4, and 0.62 GVL/water ratio), the cellulose pulp showed a cellulose content of 87.59%, while the lignin content was lower than 8%. The cellulose recovery and digestibility were equal to 79.46% and 86.94%, respectively. About 40% of the initial hemicellulose was recovered as monosaccharides. This study demonstrated the effectiveness of the two-step organosolv treatment for biomass fractionation; however, as suggested by DoE analysis, a confirmative study at a low temperature (<154 °C) should be performed to further increase the cellulose recovery.

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Section: Introductionmentioning

confidence: 99%

Fractionation of Cynara cardunculus L. by Acidified Organosolv Treatment for the Extraction of Highly Digestible Cellulose and Technical Lignin

et al. 2021

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“…The organosolv (OV) pre-treatment represents a high-value opportunity to overcome biomass recalcitrance and to recover relatively pure lignin with high yields as a co-product [7,8]. OV is a chemical treatment that employs numerous organic or aqueous solvent mixtures in order to solubilize both the lignin and hemicellulose fractions, yielding a cellulose-rich residue with increased accessibility to hydrolytic enzymes [9]. In addition, some of the organic solvents, such as methanol, ethanol, acetone, acetic acid, glycerol, and γ-valerolactone (GVL), are derived from renewable sources, enhancing the economic and environmental sustainability of the overall process [10].…”

Section: Introductionmentioning

confidence: 99%

Acid-Assisted Organosolv Pre-Treatment and Enzymatic Hydrolysis of Cynara cardunculus L. for Glucose Production

et al. 2020

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Lignocellulosic biomass is a non-edible feedstock that can be used in integrated biorefinery for the production of biochemicals and biofuel. Among lignocellulosic biomass, Cynara cardunculus L. (cardoon) is a promising crop thanks to its low water and fertilizer demand. Organosolv is a chemical treatment that uses numerous organic or aqueous solvent mixtures, and a small amount of acid catalyst, in order to solubilize the lignin and hemicellulose fractions, making the cellulose accessible to hydrolytic enzymes. Lignocellulosic residues of cardoon underwent a two-step treatment process to obtain fermentable glucose. In the first step, the milled biomass was subjected to microwave-assisted extraction using an acidified γ-valerolactone (GVL)/water mixture, yielding a solid cellulose pulp. In the second step, the pre-treated material was hydrolyzed by cellulolytic enzymes to glucose. The first step was optimized by means of a two-level full factorial design. The investigated factors were process temperature, acid catalyst concentration, and GVL/water ratio. A glucose production equal to 30.17 g per 100 g of raw material (89% of the maximum theoretical yield) was achieved after conducting the first step at 150 °C using an acidified water solution (1.96% H2SO4w/w).

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“…Anaerobic baffled reactors represent a feasible strategy to treat anaerobically low-strength municipal wastewater. These systems are composed of more UASB units, connected through a series of vertical baffles, which force wastewater to follow a defined trajectory from the inlet to the outlet (Bachmann et al, 1985;Cardoso Grangeiro et al, 2019). The CABR used in this study consisted of a rectangular section reactor (length 600 mm, width 120 mm, depth 300 mm, effective volume 17 L), composed of six chambers characterized by an equal volume.…”

Section: Anaerobic Hybrid Reactormentioning

confidence: 99%

Immobilized and granular biomass systems

Tomei,

De Sanctis,

Altieri

et al. 2024

Anaerobic Treatment of Domestic Wastewater

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In several geographic areas, domestic wastewater (DWW) is characterized by low temperatures (below 25°C), which enables a stable and effective operation of an anaerobic process, as mainstream treatment option at ambient temperature, quite challenging. Low temperatures reduce the hydrolysis rate of particulate organic matter with consequent reduction of biogas production and energy recovery. In addition, the low growth rate of the anaerobic microorganisms can cause poor effluent quality and risk of biomass washout in case of suspended biomass systems. Increasing biomass concentration in the bioreactor has the beneficial effect of increasing biodegradation kinetics thus allowing the reduction of the reactor volumes and footprint thus making the anaerobic process competitive with the conventional activated sludge process. This operating condition can be achieved with different strategies including biomass granulation and biomass immobilization on inert support media. For both alternatives, a number of studies have been conducted, with different plant configurations, operating the anaerobic process under variable temperature regimes or in isothermal mode in psychrophilic or mesophilic conditions. In this chapter, examples of application to demonstrate the feasibility of immobilized and granular biomass systems for direct anaerobic treatment of DWW are reported and discussed. In the first case, the effect of feeding strategy and the suitability of natural and synthetic filling materials were investigated while, in the second, the effect of temperature and of the hydraulic retention time have been tested in order to maximize the process performance and evaluate the potentialities of the anaerobic process in comparison to the aerobic one.

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New trends in biogas production and utilization

Cited by 18 publications

References 106 publications

Fractionation of Cynara cardunculus L. by Acidified Organosolv Treatment for the Extraction of Highly Digestible Cellulose and Technical Lignin

Fractionation of Cynara cardunculus L. by Acidified Organosolv Treatment for the Extraction of Highly Digestible Cellulose and Technical Lignin

Acid-Assisted Organosolv Pre-Treatment and Enzymatic Hydrolysis of Cynara cardunculus L. for Glucose Production

Immobilized and granular biomass systems

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