Combined alkali and hydrothermal pretreatments for oat straw valorization within a biorefinery concept

Romaní, Aloia; Tomaz, Pablo D.; Garrote, Gil; Teixeira, J. A.; Domingues, Lucı́lia

doi:10.1016/j.biortech.2016.08.077

Cited by 48 publications

(27 citation statements)

References 45 publications

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“…It was difficult to lower the pH to neutral despite more water utilization. In most of previous studies, dozens of washing times were required for removing residual NaOH, the process of which generated >10 times volumes of wastewater than fermentation broth [32]. Therefore, in present study, the combined water washing/HCl-neutralization (HN) strategy was investigated with aim to reduce water utilization.…”

Section: Resultsmentioning

confidence: 99%

The advanced strategy for enhancing biobutanol production and high-efficient product recovery with reduced wastewater generation

Xue

Zhang

Wang

et al. 2017

Biotechnol Biofuels

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BackgroundButanol as an important chemical and potential fuel could be produced via ABE fermentation from lignocellulosic biomass. The use of food-related feedstocks such as maize and sugar cane may not be a sustainable solution to world’s energy needs. Recently, Jerusalem artichoke tubers containing inulin have been used as feedstock for butanol production, but this bioprocess is not commercially feasible due to the great value of inulin as functional food. Till now, there is a gap on the utilization of Jerusalem artichoke stalk (JAS) as feedstock for microbial butanol production.ResultsBiobutanol production from JAS was investigated in order to improve cellulose digestibility and efficient biobutanol fermentation. Compared with 9.0 g/L butanol (14.7 g/L ABE) production by 2% NaOH pretreatment of JAS, 11.8 g/L butanol (17.6 g/L ABE) was produced in the best scenario conditions of NaOH–H2O2 pretreatment, washing times and citrate buffer strengths etc. Furthermore, more than >64% water in washing pretreated JAS process could be saved, with improving butanol production by >25.0%. To mimic in situ product recovery for ABE fermentation, the vapor stripping–vapor permeation (VSVP) process steadily produced 323.4–348.7 g/L butanol (542.7–594.0 g/L ABE) in condensate, which showed more potentials than pervaporation for butanol recovery.ConclusionsTherefore, the present study demonstrated an effective strategy on efficient biobutanol production using lignocellulosic biomass. The process optimization could contribute to significant reduction of wastewater emission and the improvement of lignocellulosic biomass digestibility and biobutanol production, which makes biobutanol production more efficient using JAS.

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Section: Resultsmentioning

confidence: 99%

The advanced strategy for enhancing biobutanol production and high-efficient product recovery with reduced wastewater generation

Xue

Zhang

Wang

et al. 2017

Biotechnol Biofuels

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“…Typically, cellulose is more prone to saccharification after harsh conditions of pretreatment while in these severe conditions the xylose and xylooligosaccharides are degraded into sugars and/or inhibitors compounds such as furfural (Guilliams et al, 2016). Thus, the strategy employed for this two-target goal usually includes the use of two treatments (such as an autohydrolysis combined with a delignification process) (Romaní et al, 2011(Romaní et al, , 2016. Delignification processes solubilize the lignin and, consequently, the solid fraction is enriched in glucan being more susceptible to enzymatic hydrolysis (Romaní et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

Integral valorization of vine pruning residue by sequential autohydrolysis stages

Jesus

Romaní

Genisheva

et al. 2017

Journal of Cleaner Production

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Wine processing generates a large amount of residue, in particular pruning residue of vine. In this work, autohydrolysis in two sequential stages was proposed for the integral valorization of this residue. In a first stage, vine pruning residue was submitted to autohydrolysis treatment at 180 C for 60 min (severity of 4.13) and liquid to solid ratio of 6 g water per g vine pruning residue. In these conditions, 63.7% of xylan was recovered in the liquid phase as xylooligosaccharides (17 g/L) and 2.35 g/L of phenolic compounds with antioxidant activity were also extracted. Autohydrolyzed vine pruning residue was subjected to a second autohydrolysis at temperature in the range 180e200 C and time 30e40 min. After sequential treatments, enzymatic hydrolysis of cellulose was significantly improved from 73% to 99% of conversion. At selected conditions (severity of 4.60), ethanol production was successfully obtained from two strategies of, separately and simultaneously, saccharification and fermentation, thus achieving ethanol yield of 96 and 83%, respectively. Overall, two sequential stages of the process allowed the recovery of 13.7 kg of xylooligosaccharides, 3.1 kg of phenolic compounds, 13.1 kg of ethanol and 27 kg of lignin per 100 kg of vine pruning residue. Sequential autohydrolysis stages were shown as a suitable strategy for the integral valorization of vine pruning residue.

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“…Nevertheless, autohydrolysis can be followed by another chemical pretreatment to improve the valorization of the hemicellulosic fraction. Examples of posterior acid pretreatment to enhance the hydrolysis of hemicellulose to monomers [86] or alkaline pretreatment to increase hemicellulose recovery [117] are worth mentioning.…”

Section: Pretreatment Of Lignocellulosic Biomass For Hemicellulose Vamentioning

confidence: 99%

A Bibliometric Study of Scientific Publications regarding Hemicellulose Valorization during the 2000–2016 Period: Identification of Alternatives and Hot Topics

Abejón

2018

ChemEngineering

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A bibliometric analysis of the Scopus database was carried out to identify the research trends related to hemicellulose valorization from 2000 to 2016. The results from the analysis revealed an increasing number of annual publications, a high degree of transdisciplinary collaboration and prolific contributions by European researchers on this topic. The importance of a holistic approach to consider the simultaneous valorization of the three main components of lignocellulosic biomass (cellulose, hemicellulose and lignin) must be highlighted. Optimal pretreatment processes are critical for the correct fractionation of the biomass and the subsequent valorization. On the one hand, biological conversion of sugars derived from hemicellulose can be employed for the production of biofuel (ethanol) or chemicals such as 2,3-butadiene, xylitol and lactic acid. On the other hand, the chemical transformation of these sugars produces furfural, 5-hydroxyfurfural and levulinic acid, which must be considered very important starting blocks for the synthesis of organic derivatives.

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Combined alkali and hydrothermal pretreatments for oat straw valorization within a biorefinery concept

Cited by 48 publications

References 45 publications

The advanced strategy for enhancing biobutanol production and high-efficient product recovery with reduced wastewater generation

The advanced strategy for enhancing biobutanol production and high-efficient product recovery with reduced wastewater generation

Integral valorization of vine pruning residue by sequential autohydrolysis stages

A Bibliometric Study of Scientific Publications regarding Hemicellulose Valorization during the 2000–2016 Period: Identification of Alternatives and Hot Topics

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