A NEW method for recycling whisky waste could replace petrochemicals and be worth up to £90m in global chemical manufacturing markets.
Scientists from Ripcell, a chemical manufacturing business, are working with researchers from the University of Aberdeen to demonstrate the feasibility of recovering high-value compounds from distilling.
The Aberdeen-based start up is looking to highlight the value of extracting lactic acid, from pot ale and spent lees, the co-products of the first and second stages of the whisky distillation process.
These extracted chemicals have potential applications in sectors where manufacturing typically depends on unsustainable petrochemical-derived ingredients.
The scientists say this could help industries such as pharmaceuticals, food and drink and cosmetics manufacture products more sustainably.
The project has been supported with funding from the Industrial Biotechnology Innovation Centre and samples of waste streams were provided by Chivas Brothers from 12 of its distilleries across Scotland.
The research team developed a process using a separation technique known as liquid chromatography to isolate and extract higher-value acids, initially from pot ale.
It has now been adapted to retrieve additional solvents from spent lees.
While residue from pot ale is typically used in low value applications such as animal feeds, the 10 litres of spent lees generated from every litre of whisky are currently discarded
A life cycle analysis of the process was also completed to assess its environmental impact.
The results suggested that the bio-based chemicals produced through this method have a significantly lower carbon footprint than those produced through petrochemicals.
Estimates suggest that on a global scale, the new manufacturing method for target chemicals could reduce industry emissions by 392m kg of CO2 equivalent per year.
Following the success of the feasibility study, the next phase for the team will involve scaling up the separation process to prove its viability at an industrial scale.
Dr Eve Wildman, founder of Ripcell, said: “Around 2.6bn litres of wastewater is produced from the Scottish whisky industry every year, so the potential of this process is huge.
“For decades, the majority of these co-products have been used as animal feed, but we have found a new, more valuable option to deal with spent lees that could change the ways in which distilleries manage and process their residues.
“At the same time, this could be transformational for the chemicals industry.
“By taking a sustainable approach to manufacturing key compounds, rather than using fossil fuels, Ripcell can help to reduce greenhouse gas emissions from the production process.
“For every kilo of bio-chemicals produced, we can remove 1.59kg of harmful greenhouse gas emissions.”
Dr Liz Fletcher, director of business engagement at IBioIC, said: “This project is a brilliant example of how we can add economic value by taking a circular approach to co-products and applying biotechnology.
“For both whisky producers and the chemicals industry, this process marks a significant step forward in reducing the environmental impact of manufacturing.
“We look forward to supporting Ripcell throughout its next steps to bring the process closer to commercial application.”
Dr Alan Mccue, senior lecturer at the University of Aberdeen, said: “The idea of utilising wastewater from a traditional industry like whisky production for the recovery of bio-based chemicals is highly innovative.
“It’s great to see Scottish heritage being linked to sustainable chemical production. The outcomes of this IBioIC funded project are really exciting, and I look forward to supporting Ripcell in the next stages of its development.”
