The world’s population growth that occurred in the last decades is one of the main reasons behind the reduction of natural resources and the increase of pollution and environmental contamination. According to this fact, the role of sustainability has become a necessity, since the future perspective of the human settlements will be characterized by an urban scenario, with the majority of the people living in the cities. Therefore, the placement of the cities in a circular economy process can be considered as an interesting and strong tool in order to identify and exploit the available resources with a consistent potential and achieve relevant benefits from them.