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Subcritical hydrothermal pretreatment of olive mill solid waste for biofuel production. | LitMetric

Subcritical hydrothermal pretreatment of olive mill solid waste for biofuel production.

Bioresour Technol

Division of Environmental, Water & Agriculture Engineering, Faculty of Civil and Environmental Engineering, Technion Institute, Haifa 32000, Israel. Electronic address:

Published: January 2016

AI Article Synopsis

Article Abstract

The hydrothermal pretreatment of olive mill solid waste amended with 0.6M organic acids was studied at temperatures between 100 and 170°C. Acetic and formic acids which are endogenous intermediates of hemiacetyl splitting at subcritical conditions were tested. Formic acid, with smaller molecular size and lower pKa, was found to be more effective than acetic in the entire range of temperatures tested. Yield of enzymatic hydrolysis was significantly enhanced (>2 folds) at temperatures above 140°C. Concentration of aldehyde byproducts in the medium increased with temperature and pressure and addition of organic acids, however, the highest concentration detected (ca 1g/L) did not surpass values reported as inhibitory of sugars fermentation to ethanol by either yeast or bacteria. Aldehyde production was more affected by temperature than by acid addition. Concluding, addition of formic acid to hydrothermal pretreatment at relatively mild temperatures (140-170°C) and pressure (10-13 atm) improved saccharification yield while saving energy.

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Source
http://dx.doi.org/10.1016/j.biortech.2015.08.138DOI Listing

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