**Conflict of interest**

The author declares no conflict of interest.

## **Thanks**

This review is dedicated to Dr. Mieczysław Steininger's (1950–2021) memory, a well-respected academic, extraordinary scientist and wonderful mentor. On behalf of the Clariter Board, Management, all the staff and especially myself, I would like to thank you for all the research, involvement, impact and inspiration of your extraordinary mind and charming personality.

*Waste Material Recycling in the Circular Economy - Challenges and Developments*
