Mild microwaves, ultrasonic and alkaline pretreatments for improving methane production: Impact on biochemical and structural properties of olive pomace
[Display omitted] •Alkaline pretreatment was the most effective in lignin removal of olive pomace.•Alkaline pretreatment increased methane produced by 30%.•Lipid contents in alkali and ultrasonic pretreated solids were highly reduced.•Single microwave and ultrasound were less effective than combined...
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Veröffentlicht in: | Bioresource technology 2020-03, Vol.299, p.122591-122591, Article 122591 |
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Sprache: | eng |
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•Alkaline pretreatment was the most effective in lignin removal of olive pomace.•Alkaline pretreatment increased methane produced by 30%.•Lipid contents in alkali and ultrasonic pretreated solids were highly reduced.•Single microwave and ultrasound were less effective than combined pretreatments.
This study aims to investigate the effects of microwaves, ultrasonic and alkaline pretreatments on olive pomace properties and its biomethane potential. Alkaline pretreatment was found to reduce lipid and fiber contents (especially lignin) and to increase soluble matter. The alkali pretreatment at a dose of 8% (w/w TS) under 25 °C and for 1 day removed 96% of initial lipids from the solid olive pomace. Unlike NaOH addition, mild microwaves and ultrasonic pretreatments had no impact on lignin. However, in the case of long microwaves pretreatment (450 W-10 min), cellulose and lignin contents were reduced by 50% and 26% respectively. Similarly, the combination of ultrasonic and alkali reagent showed a positive effect on fiber degradation and lipid solubilization as well as a positive impact on methane production. Statistical analysis highlighted the correlation between NaOH dose, solubilization and methane production. The alkaline pretreatment at ambient temperature appeared the most energetically efficient. |
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ISSN: | 0960-8524 1873-2976 |
DOI: | 10.1016/j.biortech.2019.122591 |