Take Root Bio has collaborated with Heriot-Watt University to turn salty whey, a high-volume by-product from cheese production, into a widely used fuel called bioethanol
With support from the Industrial Biotechnology Innovation Centre (IBioIC), which connected the two organisations via its industry network, the project combined Take Root Bio’s closed-loop approach with Heriot-Watt’s expertise in bio-based solutions.
The organisations looked at how the sugars in salty whey could be transformed through a bio-based process to create value from a material that is often difficult and costly to manage. The project also leaves behind a secondary stream that could be recovered and reused.
Around 95,000 tonnes of salty whey are generated in the UK each year from the production of cheddar and similar cheeses, with its combination of milk sugars and high salt content making it difficult to manage. A single dairy producer can generate tens of thousands of litres a week, creating environmental and economic pressures for the sector.
While the project is focused on dairy waste, the thinking behind it draws on the company’s roots in biosphere engineering and complements Heriot-Watt’s circular economy expertise. In the systems developed by Take Root Bio, resources are kept in use for as long as possible, with one process feeding into the next rather than creating waste.
The same thinking is mirrored in Heriot-Watt’s side of the project. Its scientists specialise in finding new value in food and drink by-products; using biological processes to turn difficult materials into usable resources.
The centre of the project was the idea that salty whey could be treated as a resource rather than waste, enabling dairy producers to potentially reduce the costs associated with its management while providing feedstock for new bio-based products. The company is also investigating if mobile production units could be deployed closer to where these by-products are produced to reduce transport requirements and make the concept easier to scale.
Kirk Siderman-Wolter, founder of Take Root Bio, said, “We’ve always been interested in what happens when you stop looking at something as waste and start asking what else it could become. The company began by looking at how people might grow food in space, where every resource matters and nothing can be thrown away. The same principles apply surprisingly well here on Earth.
“Salty whey is produced in huge volumes and can be difficult to deal with, so we wanted to find out whether there was a better use for it. If we can help turn something that currently costs money to manage into something with real value, that’s a positive outcome for both dairy producers and the environment.”
Heriot-Watt has taught and researched brewing and distilling since 1930 and is home to the International Centre for Brewing and Distilling (ICBD). The university is also developing plans for a new Centre for Sustainable Brewing and Distilling to enable the sector to address environmental challenges and support more sustainable ways of working.
Dr Liz Fletcher, director of impact and deputy CEO at IBioIC, said, “One of the biggest opportunities in industrial biotechnology is finding new uses for materials that are currently treated as waste. By bringing together businesses and academic expertise, projects like this can uncover solutions that deliver both environmental and commercial benefits.
“What we liked about this project was that it approached a familiar problem from a different angle. That’s exactly the sort of innovation we want to support, and we’re excited to see where the work goes next.”
Dr Jane White, an expert in waste valorisation at Heriot-Watt University, said, “Food and drink manufacturing produces a huge range of by-products, many of which still contain valuable components but can be challenging to manage. That makes them interesting candidates for bio-based processes that can recover value from materials that might otherwise be treated as waste.”
Dr Shiwen Zhuang, specialised in fermentation development at Heriot-Watt University, said, “This project gave us the opportunity to explore whether bio-based solutions could help unlock some of the value in salty whey while reducing the pressures associated with disposal. It’s exactly the kind of upcycling approach that could strengthen sustainability across the food and drink sector.”
Take Root Bio, in collaboration with Heriot-Watt University, is continuing to investigate whether similar techniques could be applied to other food and agricultural by-products, including waste from fruit and vegetable processing. The company is also exploring techniques to capture gases generated during fermentation for use in future food production systems.
