The workshop’s main objective was to foster discussion and validate the policy proposals needed to advance the implementation of systemic circular solutions. This event, aimed at public sector representatives, experts, and policymakers, sought to foster collaboration among various stakeholders to overcome the barriers currently hindering the transition to more sustainable models. During the session, two practical case studies were presented: the mechanical recycling of complex plastics, such as multilayer PET, and the recovery of biowaste, particularly brewer’s spent grain. Through these activities, the feasibility of policy recommendations focused on recycling, eco-design, and infrastructure improvements was explored in depth, with the active participation of regional stakeholders—a key factor in formulating more effective public policies aligned with global challenges.

During the session on multilayer PET recycling, participants assessed the impact and feasibility of the recommendations identified in previous workshops, where key barriers and opportunities for improving the recyclability of this material were discussed. Its multilayer composition makes it difficult to process. Among the recommendations analysed, the development of new mechanical recycling processes was discussed, using extrusion and injection moulding to produce products such as pallets and container trays. In parallel, during the session on biowaste recovery, key proposals were addressed to facilitate the scaling up of recovery technologies to an industrial level, such as technical and financial support to transition from the pilot phase to the industrial phase, and the creation of centres of excellence in biowaste treatment. Both groups agreed that the creation of knowledge networks and the implementation of public-private collaboration mechanisms are essential for advancing the valorisation of these byproducts. Furthermore, the importance of having a harmonized regulatory framework at the European level, which facilitates the implementation of these innovative solutions, was highlighted, and the need to generate greater financial and legislative support to overcome current barriers was emphasized.

Throughout the workshop, the importance of creating knowledge platforms and educational programs on best practices for recovery and recycling was emphasized. However, regulatory barriers and discrepancies between national and European legislation remain significant obstacles. Despite these challenges, most participants agreed that adequate legislative and financial support, along with the development of infrastructure and clear legal frameworks, are essential to ensuring that circular economy solutions are viable in the long term and can be successfully implemented across various regions and sectors.