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Title Two-phase anaerobic digestion for enhanced valorisation of whiskey distillery by-products
ID_Doc 25112
Authors Hackula, A; Shinde, R; Hickey, D; O'Shea, R; Murphy, JD; Wall, DM
Title Two-phase anaerobic digestion for enhanced valorisation of whiskey distillery by-products
Year 2023
Published
Abstract The valorisation of whiskey by-products was assessed and compared in three anaerobic digestion systems. The systems produced similar methane yields, which could satisfy up to 44% of the thermal energy demand at a distillery. Using methane generated from by-products would displace natural gas and reduce the distillery's carbon footprint. Two-phase systems had higher methane content (ca. 75 %vol) than the traditional system (54 % vol) and furthermore, unlocked opportunities for volatile fatty acid production. The potential value that could be generated from the extraction of butyric acid and caproic acid was approximately euro6.76 million for a 50 million litre alcohol facility (0.14 euro per litre of whiskey). All three anaerobic digestion systems showed the potential to valorise whiskey by-products and convert current linear distillery production processes into circular repurpose and reuse production processes.
PDF https://doi.org/10.1016/j.biortech.2023.129239

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