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Optimisation and modelling of anaerobic digestion of whiskey distillery/brewery wastes after combined chemical and mechanical pre-treatment

Gunes, Burcu, Carrie, Maxime orcid logoORCID: 0000-0002-5657-9299, Benyounis, Khaled orcid logoORCID: 0000-0001-6599-4892, Stokes, Joseph orcid logoORCID: 0000-0002-6924-1887, Davis, Paul, Connolly, Cathal and Lawler, Jenny orcid logoORCID: 0000-0001-9947-0958 (2020) Optimisation and modelling of anaerobic digestion of whiskey distillery/brewery wastes after combined chemical and mechanical pre-treatment. MDPI processes, 8 (4). ISSN 2227-9717

Abstract
Whiskey distillery waste streams consisting of pot ale (liquid residue) and spent grain (solid residue) are high strength organic wastes and suitable feedstock for anaerobic digestion (AD) from both economic and environmental stand points. Anaerobic digestion of pot ale and pot ale/spent grain mixtures (with mixing ratios of 1:1, 1:3, and 1:5 by wet weight) was performed after implementation of a novel hybrid pre-treatment (combined chemical and mechanical) in order to modify lignocellulosic structure and ultimately enhance digestion yield. Lignin, hemicellulose, and cellulose fractions were determined before and after chemical pre-treatment. Effects of different inoculum rates (10–30–50% on wet basis) and beating times (0–7.5–15 min) on anaerobic digestion of pot ale alone and of pot ale/spent grain mixtures were investigated in lab scale batch mode with a major focus of optimising biogas yield by using response surface methodology (RSM) in Design Expert Software. The highest biogas yields of 629 ± 8.5 mL/g vs. (51.3% CH4) and 360 ± 10 mL/g vs. (55.0 ± 0.4) with anaerobic digestion of pot ale alone and spent grain mix after 1M NaOH and 7.5 min beating pre-treatments with 50% inoculum ratio respectively. The optimum digestion conditions to maximise the biogas quality and quantity were predicted as 10 and 13 min beating times and 32 and 38 ◦C digestion temperatures for anaerobic digestion of pot ale alone and spent grain mix respectively.
Metadata
Item Type:Article (Published)
Refereed:Yes
Uncontrolled Keywords:anaerobic digestion; pot ale; spent grain; pre-treatment; lignocellulose; response surface methodology
Subjects:Biological Sciences > Biotechnology
DCU Faculties and Centres:DCU Faculties and Schools > DCU Business School
DCU Faculties and Schools > Faculty of Engineering and Computing > School of Mechanical and Manufacturing Engineering
DCU Faculties and Schools > Faculty of Science and Health > School of Biotechnology
Research Initiatives and Centres > Water Institute
Publisher:MDPI
Official URL:https://dx.doi.org/10.3390/pr8040492
Copyright Information:© 2020 The Authors. (CC-BY-4.0)
Funders:This project was fully funded by Alltech Ireland Ltd., Project ID 15-S-ST-10568.
ID Code:25670
Deposited On:23 Mar 2021 11:40 by Burcu Gunes . Last Modified 24 Mar 2021 14:07
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