Research into strategies aimed at promoting a shift in product value chain models, aligned with the concept of a circular economy. Industrial symbiosis. New, more sustainable and efficient processes. Study of the environmental efficiency of products from a life-cycle perspective. New waste, emissions, and discharge treatment processes. Research into the recovery of critical raw materials. Traceability systems for environmental information on products within the framework of the circular economy, in line with digital product passports (DPPs) and new environmental regulations.