Lignocellulosic ethanol: Technology design and its impact on process efficiency

Paulová, Leona; Patáková, Petra; Branská, Barbora; Rychtera, M.; Melzoch, Karel

doi:10.1016/j.biotechadv.2014.12.002

Cited by 160 publications

(95 citation statements)

References 147 publications

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“…Woo et al (2014) and Mendes et al (2016) tested the S. cerevisiae growth rate by increasing the temperature from 30 to 42 °C, and they observed a decrease from 0.49 to 0.12 h -1 and from 0.44 to 0.29 h -1 , respectively. On the basis of the results of this study and taking into account the literature data (Olofsson et al 2008;Paulova et al 2015), 37 °C was recognized as the best temperature that compromised between the enzymatic hydrolysis and fermentation processes, and enabled both a high yeast growth rate and cellulase activity; therefore, the SSF process and SSF step of the PSSF process were performed at 37 °C in this work. …”

Section: Resultsmentioning

confidence: 97%

“…The best performance in the enzymatic hydrolysis is usually obtained at approximately 50 °C (Paulova et al 2015). Mutturi and Lidén (2013) and Linde et al (2007) obtained an increase of 8 to 12 % in the percent hydrolysis by increasing the temperature from 32 to 45 °C.…”

Section: Effect Of Enzyme Loading and Solids Amount On Enzymatic Hydrmentioning

confidence: 99%

“…PSSF is a process commonly used to overcome several problems that limit other conversion processes by combining the advantages of SHF and SSF (Paulova et al 2015). In order to investigate on the effect of enzyme concentration and solids loading during PSSF using giant reed biomass for bioethanol production, flasks containing A. donax hydrolyzate for 72 h at 37 °C, as previously described, were inoculated with S. cerevisiae NA227 and ethanol production was monitored for 96 h.…”

Section: Pre-hydrolysis and Simultaneous Saccharification And Fermentmentioning

confidence: 99%

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Effect of Cellulase, Substrate Concentrations, and Configuration Processes on Cellulosic Ethanol Production from Pretreated Arundo donax

Aliberti¹,

Ventorino²,

Robertiello³

et al. 2017

BioResources

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Arundo donax was used to investigate the effect of the enzyme and substrate concentrations on hydrolysis, pre-hydrolysis and simultaneous saccharification and fermentation (PSSF), in comparison to simultaneous saccharification and fermentation (SSF). Hydrolysis was performed at 37 and 50 °C. At the highest biomass (10%) and enzyme (69.6 FPU/g cellulose) loadings, the highest glucose concentration (32.4 g/L) was obtained (at 50 °C). SSF resulted in a cellulose conversion (91.9%) and an ethanol concentration (19.8 g/L) higher than what was obtained using PSSF at 37 °C (86.9% and 18.8 g/L, respectively) and PSSF at 50 °C (81.6% and 17.7 g/L, respectively). A positive correlation between the cellulase concentration, cellulose conversion, and ethanol content was observed. In PSSF, the increase in the solids loadings caused a reduction in the % cellulose conversion, but the ethanol concentration in PSSF and SSF increased. SSF appeared to be the most advantageous process for bioethanol production from A. donax.

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Section: Resultsmentioning

confidence: 97%

Section: Effect Of Enzyme Loading and Solids Amount On Enzymatic Hydrmentioning

confidence: 99%

Section: Pre-hydrolysis and Simultaneous Saccharification And Fermentmentioning

confidence: 99%

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Effect of Cellulase, Substrate Concentrations, and Configuration Processes on Cellulosic Ethanol Production from Pretreated Arundo donax

Aliberti¹,

Ventorino²,

Robertiello³

et al. 2017

BioResources

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“…Extensive research efforts have been made in recent years on the technical aspects lignocellulosic ethanol production. Various integrations of individual technological steps have been investigated and few of them showed promising such as SSF, the principle of these approaches remains the same, rather fundamental steps should be followed for effi cient conversion of cellulose and hemicellulose into ethanol (PAULOVA et al, 2015).…”

Section: Discussionmentioning

confidence: 99%

Bioethanol Potential From High Density Short Rotation Woody Crops on Marginal Lands in Central Chile

Acuña

Cancino

Rubilar

et al. 2017

CERNE

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Cellulosic ethanol is one of the most important biotechnological products to mitigate the consumption of fossil fuels and to increase the use of renewable resources for fuels and chemicals. Short rotation woody crops (SRWC) have been proposed as the most promising raw material for cellulosic ethanol production, as a result of its several advantages over traditional crops. In order to analyze the potential as crops for lignocellulosic bioethanol production in Chile, SRWC were established with the following species: Acacia melanoxylon, Eucalyptus camaldulensis, Eucalyptus globulus and Eucalyptus nitens. These crops were established in two contrasting environments and in three plantation densities. The average theoretical ethanol yield at 48 months reached 395.9 L . t -1 for A. melanoxylon, 348.7 L . t -1 for E. camaldulensis, and 363.9 L t -1 for E. nitens. It can be concluded that there are significant differences in polysaccharides yield between species and time. On the other hand, significant differences were found between environments.In conclusion, this study has shown that the choice of SRWC species used as a source of polysaccharides must take into account the percentage content in biomass and, crucially, the species, planting density, harvest cycle and site must be carefully selected to ensure a high biomass yield per unit area. POTENCIAL DE BIOETANOL DE CULTURAS LENHOSAS CONDUZIDAS EM ALTA DENSIDADE E CURTA ROTAÇÃO EM TERRAS MARGINAIS NO CHILE CENTRALRESUMO: Etanol celulósico é um dos mais importantes produtos biotecnológicos para reduzir o consumo de combustíveis fósseis e a aumentar a utilização de recursos renováveis para combustíveis e produtos químicos. Culturas lenhosas de curta rotação (CLCR) têm sido propostas como a mais promissora matéria prima para produção de etanol celulósico, devido às suas várias vantagens sobre culturas tradicionais. Para analisar o potencial de culturas para produção de bioetanol lignocelulósicos no Chile, CLCR foram estabelecidos com as seguintes espécies: Acacia melanoxylon, Eucalyptus camaldulensis, Eucalyptus globulus e Eucalyptus nitens. Estas culturas foram estabelecidas em dois ambientes contrastantes e em três densidades de plantio. O rendimento teórico médio de etanol em 48 meses atingiu 395,9 L . t -1 para A. melanoxylon, 348,7 L . t -1 para E. camaldulensis e 363,9 L . t -1 para E. nitens. Foi concluído que existem diferenças significativas no rendimento de polissacarídeos entre as espécies e o tempo. Por outro lado, foram encontradas diferenças significativas entre ambientes. Em conclusão, este estudo mostrou que a escolha da espécie usada na CLCR como fonte de polissacarídeos deve levar em conta sua percentagem na biomassa e, crucialmente, a espécie, densidade de plantio, ciclo de colheita e sítio devem ser cuidadosamente selecionados para garantir um rendimento elevado de biomassa por unidade de área.

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“…The third major component of plant biomass lignin has a rather complex structure, composed of various interconnected phenol propane units. Of these three components, lignin is the most resistant to the enzymatic attack (Paulova et al 2015). Indeed, this very resistance exhibited by the lignocellulose complex constitutes a major obstacle to exploit the potential of plant biomass in biotechnology, as it prolongs processes and simultaneously decreases yields.…”

Section: Introductionmentioning

confidence: 99%

Quantitation of the Inhibition Effect of Model Compounds Representing Plant Biomass Degradation Products on Methane Production

et al. 2017

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During the steam explosion pretreatment of plant biomass, degradation products are generated, and some of these have inhibitory activity against biogas production. The aim of this study was to investigate and quantify the effect of selected model inhibitory compounds on methane production. The results showed no significant inhibition of methane production by furfural at concentrations below 1 g/L. In addition, the microbial community was able to restore biogas production inhibited by this compound after a certain time. 5-hydroxymethylfurfural was evaluated as a more potent inhibitor, with a significant effect above 0.2 g/L. Both compounds were more effective inhibitors with cellulose as the carbon substrate, probably reflecting higher sensitivity of the cellulolytic step in biogas production. No significant inhibition was observed for the phenolic compounds tested, gallic and tannic acids, at concentrations of up to 2 g/L. Thus, the compounds investigated should not represent a problem for the biogas production involving steam explosion preprocessed plant biomass.

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Lignocellulosic ethanol: Technology design and its impact on process efficiency

Cited by 160 publications

References 147 publications

Effect of Cellulase, Substrate Concentrations, and Configuration Processes on Cellulosic Ethanol Production from Pretreated Arundo donax

Effect of Cellulase, Substrate Concentrations, and Configuration Processes on Cellulosic Ethanol Production from Pretreated Arundo donax

Bioethanol Potential From High Density Short Rotation Woody Crops on Marginal Lands in Central Chile

Quantitation of the Inhibition Effect of Model Compounds Representing Plant Biomass Degradation Products on Methane Production

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