PRERECICLA aims to promote the implementation of biotechnological recycling processes by carrying out treatment studies (pretreatments) that allow overcoming the greatest challenge identified in these biotechnological processes, which is the access of enzymes or microorganisms to the key points of degradation of the plastic structures. Specifically, this project will cover the pre-treatment of the three materials identified as highly relevant (PE, PET and RPIs) due to their difficulty in recycling and their wide availability as waste.