A research project within Resource Recovery at the University of Borås explored how valuable substances can be extracted from organic waste – such as animal manure – and how this loop can be closed by producing animal feed.In her doctoral project, Clarisse Uwineza demonstrated how food waste and animal manure can be converted into valuable volatile fatty acids. These acids can then be used as a substrate to cultivate protein-rich fungal biomass, which in turn can be used to produce animal feed.Early in her studies, she developed an interest in creating sustainable methods for managing waste and by-products. Her research allowed her to combine her interests in both biotechnology and resource recovery.Organic waste, such as food waste and manure from agriculture, is a growing environmental issue. However, by using a method known as anaerobic digestion, where microorganisms break down waste in an oxygen-free environment, it is possible to extract these volatile fatty acids. These acids, along with nutrients such as nitrogen and minerals, can then be used to cultivate a specific fungus: Aspergillus oryzae. The fungus grows into a biomass rich in protein, minerals and dietary fiber, and is also easily digestible for animals.“My work shows that organic residues can serve as a valuable raw material for sustainable protein production, helping to close the loop in a circular economy and potentially reducing the use of protein sources such as soy and fishmeal, which currently form the basis of animal feed production
