Pretreatment of lignocellulosic sugarcane leaves and tops for bioethanol production

Niju, Subramaniapillai; Swathika, M.; Balajii, Muthusamy

doi:10.1016/b978-0-12-815936-1.00010-1

Cited by 26 publications

(12 citation statements)

References 19 publications

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“…Although using acid in the lignocellulosic pretreatment process removes hemicellulose and increases the lignocellulose pore size, the main disadvantage is the formation of inhibitors such as hydroxymethylfurfural (HMF), furfural, and other by-products, such as phenylic compounds and aliphatic carboxylic acids [41]. Additionally, the downstream process requires pH neutralization and significant biomass size reduction [50].…”

Section: The Effect Of Molar Ratio and Type Of Deep Eutectic Solvents...mentioning

confidence: 99%

Biohydrogen and Methane Production from Sugarcane Leaves Pretreated by Deep Eutectic Solvents and Enzymatic Hydrolysis by Cellulolytic Consortia

et al. 2022

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This study determined the optimal conditions for the deep eutectic solvent (DES) pretreatment of sugarcane leaves and the best fermentation mode for hydrogen and methane production from DES-pretreated sugarcane leaves. Choline chloride (ChCl):monoethanolamine (MEA) is the most effective solvent for removing lignin from sugarcane leaves. The optimum conditions were a ChCl: MEA molar ratio of 1:6, 120 °C, 3 h, and substrate-to-DES solution ratio of 1:12. Under these conditions, 86.37 ± 0.36% lignin removal and 73.98 ± 0.42% hemicellulose removal were achieved, whereas 84.13 ± 0.77% cellulose was recovered. At a substrate loading of 4 g volatile solids (VS), the simultaneous saccharification and fermentation (SSF) and separate hydrolysis and fermentation (SHF) processes yielded maximum hydrogen productions of 3187 ± 202 and 2135 ± 315 mL H2/L, respectively. In the second stage, methane was produced using the hydrogenic effluent. SSF produced 5923 ± 251 mL CH4/L, whereas SHF produced 3583 ± 128 mL CH4/L. In a one-stage methane production process, a maximum methane production of 4067 ± 320 mL CH4/L with a substrate loading of 4 g VS was achieved from the SSF process. SSF proved to be more efficient than SHF for producing hydrogen from DES-pretreated sugarcane leaves in a two-stage hydrogen and methane production process as well as a one-stage methane production process.

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Section: The Effect Of Molar Ratio and Type Of Deep Eutectic Solvents...mentioning

confidence: 99%

Biohydrogen and Methane Production from Sugarcane Leaves Pretreated by Deep Eutectic Solvents and Enzymatic Hydrolysis by Cellulolytic Consortia

et al. 2022

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“…Lignin preserves and strengthens the fibers, inhibiting the action of the enzymes, but the crystalline areas of the cellulose also decrease the surface area accessible to enzymes. However, the presence of lignin in the feedstock could affect energy production, and efficient pretreatment becomes mandatory for maximum lignin removal [ 26 ]. Therefore, preliminary thermochemical treatment of lignocellulosic raw material (wheat straw) was carried out with Ca(OH) 2 and elevated temperature (55 °C) after being mechanically treated for particle size reduction to a size of 3–5 mm using a hammer mill.…”

Section: Resultsmentioning

confidence: 99%

Impact of Waste Cooking Oils Addition on Thermophilic Dry Co-Digestion of Wheat Straw and Horse Manure for Renewable Energy Production in Two Stages

Hubenov,

Varbacheva,

Kabaivanova

2024

Life

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Anaerobic co-digestion of waste wheat straw and horse manure in two steps was revealed as a promising option for renewable energy production in the form of hydrogen and methane. Addition of waste cooking oils, disposal of which could cause damage to health or the environment, as a third substrate for digestion, is suggested as an approach not only to help handle the increasing volume of food waste worldwide but also to improve process performance. In the present study, waste cooking oil, in a concentration of 5%, appeared to be a positive modulator of anaerobic digestion with the production of hydrogen and did not lead to inhibition of the hydrolysis phase. The overall efficiency of the two-stage anaerobic digestion of the mixture, which contains mainly lignocellulose waste, is positively dependent on thermochemical pretreatment with the alkali reagent (Ca(OH)2), but elevated temperature (55 °C) and cooking oil addition revealed the opportunity to omit the pre-treatment step. Nevertheless, the overall energy production was lower due to the methane production step. However, the addition of waste cooking oils to the process in which lig-nocellulose is not pretreated (V3) led to an increase in the methane production and energy yield compared to V1. The anaerobic digestion of lignocellulosic waste is a complex process and comprises successive degradation pathways and syntrophic microbial associations’ activities, so the division in two reactors ensured suitable conditions for the microorganisms residing in each of them. In this study, along with the production of hydrogen and methane and the separation of the hydrolysis and methanogenesis stages, utilization of agriculture- and kitchen-generated wastes was realized in the context of waste-to-energy sustainable production methods.

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“…As a result, this method has been thoroughly investigated. For a variety of biomass, dilute sulphuric acid (less than 4 wt%) is preferred [44]. Modification with acid is chosen over other procedures such as liquid hot water, organosolv, and steam explosion because these other procedures involve high costs of solvent for LDMs reclamation and recycling, incomplete hemicellulose solubilization, hazardous chemical formation, and high energy consumption.…”

Section: Impact Of Concentration Time and Temperature On Acid Modific...mentioning

confidence: 99%

Acid modification of lignocellulosic derived material for dye and heavy metals removal: A review

Akindolie

Choi

2022

Environmental Engineering Research

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Researchers have tested Lignocellulose derived material (LDMs) from different sources ranging from agricultural to wood in order to facilitate the adsorption of chemical contaminants, such as heavy metals and dyes from water bodies, to eradicate water contamination. However, different methods have been employed to modify the nature of the LDMs to enable their suitability for contaminants removal. Among all these methods, acid modification of LDMs has gained a lot of attention. This review focused on the use of acid modification LDMs for the removal of anionic and cationic dyes, and heavy metals in water. The characteracerization techniques employed in studying the morphology and functional groups of the LDMs were discussed. The adsorption dynamics and mechanisms of reported studies were extensively summarized. The reported adsorption capacity of unmodified LDMs in the available liturature is in the range of 4.44–156.00 mg/g while for the modified is between 80.05–250.01 mg/g for dye removal. The adsorption capacity of modified LDMs reported was 1.60–18.03 times higher than the unmodified because of additional functional groups such as -SO<sub>3</sub> from sulphuric acid modification. Finally, the future outlook and challenges of this method were pulled together.

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Pretreatment of lignocellulosic sugarcane leaves and tops for bioethanol production

Cited by 26 publications

References 19 publications

Biohydrogen and Methane Production from Sugarcane Leaves Pretreated by Deep Eutectic Solvents and Enzymatic Hydrolysis by Cellulolytic Consortia

Biohydrogen and Methane Production from Sugarcane Leaves Pretreated by Deep Eutectic Solvents and Enzymatic Hydrolysis by Cellulolytic Consortia

Impact of Waste Cooking Oils Addition on Thermophilic Dry Co-Digestion of Wheat Straw and Horse Manure for Renewable Energy Production in Two Stages

Acid modification of lignocellulosic derived material for dye and heavy metals removal: A review

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