Valorization of lignocellulosic residues from the olive oil industry by production of lignin, glucose and functional sugars

Miranda, Isabel; Simões, Rita; Medeiros, Barbara; Nampoothiri, K. Madhavan; Sukumaran, Rajeev K.; Rajan, Devi; Pereira, Helena; Ferreira‐Dias, Suzana

doi:10.1016/j.biortech.2019.121936

Cited by 59 publications

(44 citation statements)

References 28 publications

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“…GWP 100 values were taken from the latest version of the IPCC for converting emissions into CO 2 equivalents. These values were 1 and 28 for CO 2 and methane (CH 4 ), respectively 13 …”

Section: Methodsmentioning

confidence: 98%

“…After extraction, the sample was dried at 110 °C for 1 h and cooled to room temperature in a desiccator. The extractives solubilized by the solvents were determined by mass differences in the solid 13 …”

Section: Methodsmentioning

confidence: 99%

“…The residue was filtered, washed until neutralization, dried at 110 °C until reaching a constant weight and cooled to room temperature. The weight difference after treatment determined the amount of lignin 13 …”

Section: Methodsmentioning

confidence: 99%

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Fast pyrolysis as an alternative to the valorization of olive mill wastes

et al. 2020

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BACKGROUND The valorization of organic wastes through fast pyrolysis appears to be a highly promising option for decreasing pollutants and reducing consumption of natural resources. For this purpose, three different olive pomace samples were studied to determine how olive crop location and the extraction process could influence bio‐oil product distribution. Olive pomace was selected as the feedstock due to the importance of the olive oil industry in Spain. RESULTS In this study, the conditions of fast pyrolysis were optimized using lignin as a reference, with the optimum conditions being 500 °C, 20 °C ms−1 as the heating rate and 15 s as the vapour residence time. The olive pomace results determined that not only their chemical composition, but also their fat content had a remarkable effect on product distribution obtained after fast pyrolysis. However, whereas high lignin content enhanced phenol production, cellulose decomposed to carboxylic acids. In addition, due to current global warming, the carbon dioxide (CO2) burden of the three samples was calculated using mass spectroscopy. The OPGC sample gave off the lowest amount of greenhouse gases, followed by OPMNE and OPMN. CONCLUSIONS The higher fat content in the sample enhanced carboxylic acid production. The difference in phenol production between OPMN and OPMNE could be attributed to the presence of potassium. From an environmental point of view, the use of olive pomace wastes could reduce CO2 emissions with further research and by developing experimental processes. © 2020 Society of Chemical Industry

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“…GWP 100 values were taken from the latest version of the IPCC for converting emissions into CO 2 equivalents. These values were 1 and 28 for CO 2 and methane (CH 4 ), respectively 13 …”

Section: Methodsmentioning

confidence: 98%

Section: Methodsmentioning

confidence: 99%

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Fast pyrolysis as an alternative to the valorization of olive mill wastes

et al. 2020

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“…XOS, the hydrolysis products of xylan, are a new type of functional oligosaccharides. Natural XOS, generally in a small account, are found mainly in plants, such as olive, 27 sugarcane, 28 hardwood 29 and poplar. 30 XOS with the polymerization degree 2-4 (ref.…”

Section: Biological Activities and Molecular Structures Of Oligosacchmentioning

confidence: 99%

Structural features, interaction with the gut microbiota and anti-tumor activity of oligosaccharides

Chen

et al. 2020

RSC Adv.

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“…The biochemical conversion of olive stones into ethanol, using hydrothermal or acid pretreatments, has been partially studied by different authors. Thus, Miranda et al [12] applied a hydrothermal pretreatment to olive stones (130 • C, 30 min) achieving a good enzymatic digestibility of the cellulose fraction. However, the further use of liquid prehydrolysates is usually not addressed.…”

Section: Introductionmentioning

confidence: 99%

Acid and Enzymatic Fractionation of Olive Stones for Ethanol Production Using Pachysolen tannophilus

et al. 2020

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Olive stones are an abundant lignocellulose material in the countries of the Mediterranean basin that could be transformed to bioethanol by biochemical pathways. In this work, olive stones were subjected to fractionation by means of a high-temperature dilute-acid pretreatment followed by enzymatic hydrolysis of the pretreated solids. The hydrolysates obtained in these steps were separately subjected to fermentation with the yeast Pachysolen tannophilus ATCC 32691. Response surface methodology with two independent variables (temperature and reaction time) was applied for optimizing D-xylose production from the raw material by dilute acid pretreatment with 0.01 M sulfuric acid. The highest D-xylose yield in the liquid fraction was obtained in the pretreatment at 201 °C for 5.2 min. The inclusion of a detoxification step of the acid prehydrolysate, by vacuum distillation, allowed the fermentation of the sugars into ethanol and xylitol. The enzymatic hydrolysis of the pretreated solids was solely effective when using high enzyme loadings, thus leading to easily fermentable hydrolysates into ethanol. The mass macroscopic balances of the overall process illustrated that the amount of inoculum used in the fermentation of the acid prehydrolysates strongly affected the ethanol and xylitol yields.

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Valorization of lignocellulosic residues from the olive oil industry by production of lignin, glucose and functional sugars

Cited by 59 publications

References 28 publications

Fast pyrolysis as an alternative to the valorization of olive mill wastes

Fast pyrolysis as an alternative to the valorization of olive mill wastes

Structural features, interaction with the gut microbiota and anti-tumor activity of oligosaccharides

Acid and Enzymatic Fractionation of Olive Stones for Ethanol Production Using Pachysolen tannophilus

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