Are eucalyptus harvest residues a truly burden-free biomass source for bioenergy? A deeper look into biorefinery process design and Life Cycle Assessment

Nogueira, Guilherme Pessoa; McManus, Marcelle; Leak, David J.; Franco, Telma Teixeira; Dias, Margarida; Cavaliero, Carla Kazue Nakao

doi:10.1016/j.jclepro.2021.126956

Cited by 16 publications

(6 citation statements)

References 40 publications

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“…Apart from concerns over eucalyptus cultivation at scale, any use of eucalyptus (and other trees or perennial grasses such as Miscanthus) in 2G bioethanol production would require further research to identify and isolate novel enzymes for use in cellulosic conversion and to study adaptations to pretreatment technology (workshop, University of York, January 2019). Given challenges associated with lifecycle assessments due to lack of available data on environmental impacts, and specifically greenhouse gas emissions associated with the production and use of enzymes for the hydrolysis stage (Nogueira et al, 2021), it is difficult to determine the environmental desirability of 2G biofuels from eucalyptus. This is notwithstanding the fact that making such data available would support suppliers' claims of enzymes as a 'clean and green' product (Nogueira et al, 2021: 10).…”

Section: Towards a Future Beyond Sugar?mentioning

confidence: 99%

“A future beyond sugar”: Examining second-generation biofuel pathways in Alagoas, northeast Brazil

Kirshner

Brown

Dunlop

et al. 2022

Environmental Development

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Section: Towards a Future Beyond Sugar?mentioning

confidence: 99%

“A future beyond sugar”: Examining second-generation biofuel pathways in Alagoas, northeast Brazil

Kirshner

Brown

Dunlop

et al. 2022

Environmental Development

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“…Lignocellulosic biomass is another great biomass source since it is considered one of the most abundant sources of bioenergy and biobased products. Lignocellulosic biomass includes various agricultural residues such as bark, branches, logs, and leaves [20] from deciduous and coniferous trees and waste from the pulp and paper industry [21,22]. Lignin-a main component of lignocellulosic biomass-may undergo a reversed process of depolymerization, with the release of some important polyphenolic components classified as aromatic aldehydes (vanillin, syringaldehyde), hydroxybenzoic (vanillic, syringic) acids, and hydroxycinnamic (p-coumaric, ferulic) acids [7].…”

Section: Introductionmentioning

confidence: 99%

Green Extraction Techniques of Bioactive Compounds: A State-of-the-Art Review

Martins,

Barbosa,

Advinha

et al. 2023

Processes

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Green extraction techniques are more and more relevant due to major sustainable goals set by the United Nations. Greener extraction processes are being designed through the use of unconventional extraction techniques and green solvents, resulting in less hazardous processes which, consequently, reduces environmental impacts. This is also in line with the main principles of green chemistry. Additionally, greener extraction techniques intend to solve different drawbacks that are often related to conventional extraction techniques such as the high environmental impact. Biorefineries are a major player in developing greener extraction processes. These facilities take full advantage of several biomass sources, such as food waste, microalgae, and lignocellulosic biomass, in order to create high-value products, energy, alternative fuels, and bioactive compounds. Herein, a state-of-the-art review is presented, focused on presenting the greenest and least hazardous extraction processes that have been reported on the main biomass sources of a biorefinery—food waste, microalgae, and lignocellulosic biomass. Bioactive compounds such as phenolic compounds, bioactive pigments, and fatty acids are important in several sectors, mainly, the health, pharmaceutical, and agro-food sectors. Moreover, the bioactive compounds obtained through the aforementioned biomass sources and the different extraction procedures used will be presented and the authors will attempt to discuss, compare, and provide information about the most effective extraction techniques for each compound. Therewith, this review article should serve as a guide for industries, academics, and biorefineries in the future development of optimized and greener extraction procedures. Such analysis is lacking and could be very helpful for future research biorefinery projects since it tackles all of the major biomass sources of a biorefinery in a review article. To the best of our knowledge, this brings a novelty to the scientific community.

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“…Among the herbaceous feedstock, wheat straw (WS) is available as residue in several countries and is used for biorefinery applications [20][21][22][23]. Eucalyptus is a fast-growing tree and has become one of the most important hardwood resources for pulp paper production worldwide, a process that generates large amounts of residues like branches, barks, leaves, which can be used for biofuels and biochemicals production [24][25][26][27]. Butanol was chosen instead of other alcohols because, like 2M-THF, it leads to the formation of a biphasic system with water.…”

Section: Introductionmentioning

confidence: 99%

Optimized Organosolv Pretreatment of Biomass Residues Using 2-Methyltetrahydrofuran and n-Butanol

et al. 2021

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Wheat straw and eucalyptus residues were pretreated in a biphasic system, constituted of butanol (n-butanol) or 2-methyltetrahydrofuran (2M-THF) and aqueous oxalic acid solutions. The pretreatments were carried out in a 300 mL Parr reactor (Autoclave Buchi Limbo-li®) with a solid load of 5 wt.%, the temperature in the range 140–180 °C, oxalic acid load from 0 to 10 wt.% and a duration of 30–90 min. The obtained slurry was then fractionated in three streams: the aqueous phase which contained solubilized hemicellulose, the organic phase which contained the solvated lignin, and the solid residue which contained cellulose. The solid was hydrolyzed using a commercial mix of enzymes to assess cellulose digestibility and glucose production. The pretreatment was optimized to maximize the purity of the cellulose and hemicellulose fractions and the glucose recovery as free sugar. The optimization was done by using an experimental design and response surface methodology. The mass flow details of the four optimized processes were obtained. In terms of biomass fractionation, butanol demonstrated significant advantages over 2M-THF in the same range of process conditions as shown by the recovery yield of free glucose which reached 98% of the theoretical value with butanol but was 67% with 2M-THF. Tests at low temperature and low enzyme loading highlighted the importance of the solvent choice over the operating conditions. 2M-THF showed interesting performances only in the delignification step, with 90% efficiency for the straw. Regarding the use of different feedstock, fractionation and recovery were generally higher for wheat straw than for eucalyptus wood residues.

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Are eucalyptus harvest residues a truly burden-free biomass source for bioenergy? A deeper look into biorefinery process design and Life Cycle Assessment

Cited by 16 publications

References 40 publications

“A future beyond sugar”: Examining second-generation biofuel pathways in Alagoas, northeast Brazil

“A future beyond sugar”: Examining second-generation biofuel pathways in Alagoas, northeast Brazil

Green Extraction Techniques of Bioactive Compounds: A State-of-the-Art Review

Optimized Organosolv Pretreatment of Biomass Residues Using 2-Methyltetrahydrofuran and n-Butanol

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