The SYMBI info day will be dedicated to overview the industrial symbiosis, circular economy and green procurement. The conference aims to make the recent national and international results available for the expert audience in the area and to provide a common platform for experts, researchers and industrial partners. The Hungarian project partner will introduced the SYMBI project aims and the national international good practices. The first concerns the successful example of collaboration of public private partnership in Waste Management in the Region of Western Macedonia. The second example will presented is the use of wastewater treatment and transformation for renewable energy in West-Transdanubian Region. The third example is about the successful green public procurement and its advantages in Hungary. In the afternoon session presentations will be given according to different themes in wastewater treatment and circular economies.