Potentials of postharvest rice crop residues as a source of biofuel

Das, Pratyush Kumar; Das, Bidyut Prava; Dash, Patitapaban

doi:10.1016/b978-0-12-818996-2.00013-2

Cited by 23 publications

(10 citation statements)

References 63 publications

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“…The pH of the digestate largely depends on the formation rate of intermediates during AcD. At the beginning of AcD, acidogens, and acetogens would create organic acids (e.g., VFAs) and acetate, respectively (Kumar Das et al, 2020), thereby decreasing the pH of the digestate. Parawira et al (2005) indicated that acidogenesis and acetogenesis would accumulate the organic acids, where the pH of the digestate could eventually drop below 5.…”

Section: àmentioning

confidence: 99%

Anaerobic co-digestion of agricultural wastes toward circular bioeconomy

et al. 2021

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Summary A huge amount of agricultural wastes and waste activated-sludge are being generated every year around the world. Anaerobic co-digestion (AcD) has been considered as an alternative for the utilization of organic matters from such organic wastes by producing bioenergy and biochemicals to realize a circular bioeconomy. Despite recent advancement in AcD processes, the effect of feedstock compositions and operating conditions on the biomethane production processe has not been critically explored. In this paper, we have reviewed the effects of feedstock (organic wastes) characteristics, including particle size, carbon-to-nitrogen ratio, and pretreatment options, on the performance of an anaerobic digestion process. In addition, we provided an overview of the effect of key control parameters, including retention time, temperature, pH of digestate, volatile fatty acids content, total solids content, and organic loading rate. Lastly, based on the findings from the literature, we have presented several perspectives and prospects on priority research to promote AcD to a steppingstone for a circular bioeconomy.

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Section: àmentioning

confidence: 99%

Anaerobic co-digestion of agricultural wastes toward circular bioeconomy

et al. 2021

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“…9 Despite that, the main drawback of using alkali as a pretreatment precursor is alkali consumption, and it is often less effective for high lignin-containing biomass like pine. 12 The ionic liquids (mostly imidazolium salts) dissolute and regenerate the amorphous cellulose and disrupt the inter-and intramolecular hydrogen bonds among cellulose, hemicellulose, and lignin. 9 However, studies found that two nitrogen atoms in the imidazolium cation undergo deuterium exchange in a deuterated solvent due to its acidic nature, and henceforth, this deprotonation of the imidazolium cation leads to a highly reactive carbene and shows the noninnocent nature of this costly salt (e.g., unexpected side reaction).…”

Section: Introductionmentioning

confidence: 99%

“…Also, the cost of handling and disposal of acidic wastewater makes acid leaching less favorable for biomass pretreatment. , On the other hand, alkali causes swelling of biomass which ultimately makes the biomass surface more accessible for the reaction . Despite that, the main drawback of using alkali as a pretreatment precursor is alkali consumption, and it is often less effective for high lignin-containing biomass like pine . The ionic liquids (mostly imidazolium salts) dissolute and regenerate the amorphous cellulose and disrupt the inter- and intramolecular hydrogen bonds among cellulose, hemicellulose, and lignin .…”

Section: Introductionmentioning

confidence: 99%

Pretreatment of Biomass by Selected Type-III Deep Eutectic Solvents and Evaluation of the Pretreatment Effects on Hydrothermal Carbonization

Islam

Sultana

Saha

et al. 2021

Ind. Eng. Chem. Res.

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Hydrothermal carbonization (HTC) is a novel thermochemical conversion that converts wet biomass into energy dense solid fuel. Residual moisture under subcritical conditions reacts with a lignin-cellulose-hemicellulose matrix with the major reactions being identified as dehydration and decarboxylation. Among other reaction parameters (e.g., temperature, time, pressure), biomass morphology often plays a key role in HTC. The hypothesis of this study was enhancing the porous structure of biomass without significantly affecting biopolymer composition would augment hydrothermal carbonization (HTC). To prove the hypothesis, two type-III deep eutectic solvents (DESs), namely choline chloride:urea (ChCl:Urea, 1:2 mol/mol) and methyltriphenylphosphonium bromide:ethylene glycol (MTPB:EG, 1:4 mol/mol), were studied to pretreat loblolly pine at room temperature and ambient pressure for 1 h. DES pretreatment shows swelling of the biomass, increasing the surface fiber-to-fiber gap length by 52% and 185% for ChCl:Urea and MPTB:EG pretreatments, respectively. The total pore volume remained intact (2.6 × 10–3 cm3/g), although new small pores evolved, and existing pores were abated with DES pretreatment. Hydrochars prepared from DES pretreated loblolly pine showed a high O/C and H/C ratio resulting in a significant increase of energy content (up to 42%) and a decrease of mass yield (up to 50 wt %), indicating an enhancement of HTC severity due to the alteration of surface morphology by DES. A preliminary process economics revealed that integrated DES pretreatment-HTC would increase fixed capital investment but decrease the cost of operation and manufacturing than the standalone HTC process.

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“…Lignocellulosic biomass is the most promising form of biomass due to its abundance, non‐food nature and low cost. The three most significant components forming biomass are cellulose (33–51 %), hemicellulose (19–34 %) and lignin (20–30 %), [1] being the latest the most thermally stable compound among them. [2] Lignin has a complex structure mainly formed by three aromatic lignols – p‐coumaryl, coniferyl and sinapyl alcohol (Figure 1 ) – connected through a three‐dimensional network.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Pristine and Hydroxylated Oxide Surfaces on the Guaiacol HDO Process: A DFT Study

Morteo-Flores

Roldán

2021

ChemPhysChem

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The acid-base character of oxide supports is crucial for catalytic reactions. In this work, the acid-base properties of five oxide surfaces common in heterogeneous catalysis were investigated and related to their interaction with monolignol compounds derived from lignin. We have used density functional theory simulations also to understand the role of the surfaces' hydroxylation state. The results show that moderate hydroxyl coverage on the amphoteric γ-Al 2 O 3 (110) slightly strengthens the oxy-compounds' adsorption due to an increase in Lewis acidity. Similarly, low hydroxyl coverage on the reducible TiO 2 (101) enlarges its adsorption capacity by up to 42 % compared with its clean surface. The higher affinity is attributed to the more favourable interaction between the surface-OH groups and the aromatic rings. Overall, the results indicate that hydroxyl coverage enhances the amphoteric and reducible adsorption capacity towards aromatic species.

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Potentials of postharvest rice crop residues as a source of biofuel

Cited by 23 publications

References 63 publications

Anaerobic co-digestion of agricultural wastes toward circular bioeconomy

Anaerobic co-digestion of agricultural wastes toward circular bioeconomy

Pretreatment of Biomass by Selected Type-III Deep Eutectic Solvents and Evaluation of the Pretreatment Effects on Hydrothermal Carbonization

The Effect of Pristine and Hydroxylated Oxide Surfaces on the Guaiacol HDO Process: A DFT Study

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