Over the years, the world population has significantly grown, and it has been estimated to exceed 9 billion by 2050. This will be linked to a significant increase in the food demand and it will entail the intensification of production processes with higher consumption flows of required feedstock to transform raw materials into finished products. Further exacerbating this scenario are the drastic effects of climate changes and declining agricultural productivity due to increasingly arid soils and poor fertiliser availability. Therefore, there is an urgent need to develop valorisation strategies for the by-products of the food industry alternative to waste-to-energy. This thesis aims to carry out experimental tests for the recovery of two key by-products in food supply chains, Brewer's spent grains (BSG) and Apple pomace (AP).