Influence of fluid dynamic conditions on enzymatic hydrolysis of lignocellulosic biomass: Effect of mass transfer rate

Wojtusik, Mateusz; Zurita-Gotor, Mauricio; Villar, Juan C.; Ladero, Miguel; Garcı́a-Ochoa, Félix

doi:10.1016/j.biortech.2016.05.042

Cited by 31 publications

(10 citation statements)

References 29 publications

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“…The simplest approach considers conventional or modified Michaelian kinetics with competitive, noncompetitive or uncompetitive inhibition, whereas the most complex modeling strategy may take cellulose polymerization degree or particle size and morphology through a population balance into account (Zhang et al, 2014;Lebaz et al, 2015). Alternative mechanistic models sometimes account for chemical or physical phenomena which may affect the kinetics of enzymatic hydrolysis of cellulose, such as concurrent reactions (Tsai et al, 2014), adsorption equilibria without or with inactivation of adsorbed cellulase (Kadam et al, 2004;Wang and Feng, 2010;Tervasmäki et al, 2017), fractal kinetics for heterogeneous reactions (Ye and Berson, 2011), or mixing conditions through mass transfer rate (Kinnarinen et al, 2012;Wojtusik et al, 2016). It must be pointed out that the complete mechanism of enzymatic hydrolysis is still unknown, and could also depend on the type and purity of the substrate and of the enzymes.…”

Section: Introductionmentioning

confidence: 99%

Hydrolysis and fermentation steps of a pretreated sawmill mixed feedstock for bioethanol production in a wood biorefinery

Alio

Tugui

Rusu

et al. 2020

Bioresource Technology

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The aim was to demonstrate the feasibility of second-generation bioethanol production using for the very first time a sawmill mixed feedstock comprising four softwood species, representative of biomass resource in Auvergne-Rhône-Alpes region (France). The feedstock was subjected to a microwave-assisted water/ethanol Organosolv pretreatment. The investigation focused on the enzymatic hydrolysis of this pretreated sawmill feedstock (PSF) using Cellic ® Ctec2 as the enzyme, followed by fermentation of the resulting sugar solution using Saccharomyces cerevisiae strain. The cellulose-rich PSF with 71% w/w cellulose content presented a high saccharification yield (up to 80%), which made it perfect for subsequent fermentation; this yield was predicted vs. time up to 5.2% w/v PSF loading using a mathematical model fitted only on data at 1.5%. Finally, high PSF loading (7.5%) and scaleup were shown to impair the saccharification yield, but alcoholic fermentation could still be carried out up to 80% of the theoretical glucose-to-ethanol conversion yield.

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Section: Introductionmentioning

confidence: 99%

Hydrolysis and fermentation steps of a pretreated sawmill mixed feedstock for bioethanol production in a wood biorefinery

Alio

Tugui

Rusu

et al. 2020

Bioresource Technology

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“…In the quest to reduce the fossil component of transport fuel, amending bioethanol to gasoline (typically 5-15%) has been introduced in many countries, for example in the USA, Brazil and India [1][2][3] .…”

Section: Introductionmentioning

confidence: 99%

Bioethanol from corn stover – Global warming footprint of alternative biotechnologies

Zhao

Damgaard

et al. 2019

Applied Energy

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Bioethanol from residual corn stover could contribute to lowering CO2 loads within the transport sector, if used as an amendment to gasoline. We modelled by life cycle assessment and Monte Carlo simulation seven different technological configurations for producing bioethanol from corn stover based on consistent mass flows and estimated ethanol production extracted from 141 datasets of reasonable quality. By parametrizing key processes and determining their statistical distribution based on actual data, we were able to estimate the Global Warming Potential (GWPs) for all the alternative technologies on a system level. Most of the individual cases showed a net saving in GWP when the savings obtained from recovering energy from anaerobic digestion of the liquid residues and incineration of the solid residues were included. The net savings could in some cases be as high as 900~1200 kg CO2-eq/t dry corn stover solids. If the residues were not subject to energy recovery, the production of bioethanol and use in gasoline would be a net load to global warming in more than 50% of the technological configurations. The "best-practice", defined as the top 15% cumulative probability with respect to GWP, suggests that technologies based on steam explosion and ammonia-based pretreatment appear statistically the most promising and could contribute, with residue energy recovery, to GWP savings of 850-1050 kg CO2-eq/t dry corn stover solids and produce in the range 178-216 kg of bioethanol. This paper provides insights into the key parameters for bioethanol production from corn stover and suggests areas for further research.

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“…The introduction of biofuels into the transport sector is considered an important and necessary contribution to reducing the dependence of modern society on fossil energy, and bioethanol has already been introduced as an alternative to gasoline in some countries (e.g. USA, Brazil and India) [1][2][3]. From a sustainability point of view, bioethanol should be produced from secondary biomass deriving mainly from lignocellulosic waste, with the advantages of both utilising the waste through resource recovery and avoiding using biomass that would otherwise be useful as food for human [4].…”

Section: Introductionmentioning

confidence: 99%

Bioethanol from corn stover – a review and technical assessment of alternative biotechnologies

Zhao

Damgaard²,

Christensen³

2018

Progress in Energy and Combustion Science

100

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Reviewing the literature from the last decade regarding the bioconversion of corn stover into ethanol, 474 references were identified containing 561 datasets. We found 144 datasets which were sufficiently consistent and detailed to address the current state of the art of corn stover conversion to bioethanol, and we were able to categorise 93% of these datasets into eight different technological configurations for the production of bioethanol, based on the pretreatment approaches used. After pretreating, the corn stover is subject to hydrolysis and fermentation, but these two process steps were largely identical in all datasets, albeit a range of operating conditions was reported. The final distillation of the ethanol was very rarely included in the datasets. By parameterising the bioethanol production by 26 parameters, including corn stover compositions, solid loadings, operational conditions, conversion efficiencies and material consumption, we were able to quantify the material flows for each technological configuration and estimate the uncertainty of the flows. The eight technological configurations produced 11-22% ethanol from the dry solid content of the corn stover. Technologies using alkaline-, solvent or ammonia-based pretreatments produced the largest amount of ethanol (19-22%), while fungi-based pretreatment produced much less (11%). All technological configurations resulted in large flows of solid as well as liquid residues, typically containing 60 to 70% of the dry solid corn stover content. Based on the selected datasets, statistical description is provided for all parameters, including mode, median, average and deviation, within each technological configuration. Bivariate correlation analysis across and within all technological configurations indicates that some operational parameters usually considered crucial in laboratory studies, e.g. pretreatment severity, show from a statistical perspective very little correlation with the yields. The review reveals that a great deal of research has addressed the challenge of converting corn stover into bioethanol, but a significant part of these studies is of limited value in terms of scope and documentation when addressing overall material flows and key parameters in a technological context.

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Influence of fluid dynamic conditions on enzymatic hydrolysis of lignocellulosic biomass: Effect of mass transfer rate

Cited by 31 publications

References 29 publications

Hydrolysis and fermentation steps of a pretreated sawmill mixed feedstock for bioethanol production in a wood biorefinery

Hydrolysis and fermentation steps of a pretreated sawmill mixed feedstock for bioethanol production in a wood biorefinery

Bioethanol from corn stover – Global warming footprint of alternative biotechnologies

Bioethanol from corn stover – a review and technical assessment of alternative biotechnologies

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