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Brewers' Spent Grains: Drying Kinetics and Biodiesel Production

Research output: Contribution to journalJournal article

<mark>Journal publication date</mark>03/2018
<mark>Journal</mark>Bioresource Technology Reports
Number of pages8
Pages (from-to)16-23
Early online date31/01/18
<mark>Original language</mark>English


Enormous amounts of brewers' spent grains (BSGs) per year are generated to produce bear worldwide. BSGs can be used as a carbon source, biofuel to generate energy and as a source of biogas. Typically, BSGs contain >60 mass% of water and, therefore, drying kinetics is a paramount for the development of any of these valorisation processes. In this work, we reveal the main parameters and mechanism of drying kinetics of BSGs at isothermal conditions (60 °C–90 °C), measured by thermogravimetric analysis. Diffusion coefficients ranged from 1.42 × 10−9 m2 s−1 to 2.67 × 10−9 m2 s−1 while the activation energy was 26.6 kJ mol−1. Furthermore, for the first time, biodiesel production from BSGs is reported. We employed acid catalysed in situ transesterification process, at different catalyst concentrations, methanol to BSGs ratios, reaction time and temperature. The outcomes of our study show promise for alternative valorisation of brewers' spent grains, an abundant waste spread around the world.

Bibliographic note

This is the author’s version of a work that was accepted for publication in Bioresource Technology Reports. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Bioresource Technology Reports, 1, 2018 DOI: 10.1016/j.biteb.2018.01.005