TECHNOLOGY FOCUS - INSTRUMENTATION AND TESTING - Preferred System: The system (S1) further comprises at least one filter placed downstream of the gasifying device and connected to it. The system (S1) further comprises at least one chamber for water injection placed upstream of the centrifugating device and connected to it. The system (S1) further comprises at least one chamber for mixing additives and hot gases, and for collecting inerts, placed upstream of the thermal separator and connected to it.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Process: In the process (P1), the pyrolysis process is performed with heat produced by the gasification process regarding char and tar produced by the pyrolysis process. The process (P1) further involves transmitting to wastes the heat deriving from gasification, through mixing. The process (P1) further involves before the step of subjecting the wastes to a gasification process, the step of mechanically, chemically and electrically cleaning the char. The gasification process of char and tar is performed through water and air containing excess heat used for performing the pyrolysis process. The process (P1) further involves the step of separating tar from syngas through cooling with water and air. The process (P1) further involves the step of filtering hot gases deriving from the gasification process and afterwards used for mixing with wastes. The process (P1) involves: inserting wastes through a hopper; mixing the wastes in a chamber with hot gas produced by the gasification process; performing the pyrolysis process in a rotating drum with thermal energy generated from the mixing step, the pyrolysis process allowing to decompose the wastes into a solid part, with char and inerts, and a gaseous part, with syngas and condensable tar, the thermal energy to perform such treatment being obtained from the gasification process in a gasifying device with air and water coming from the char and tar, the gasified part being essentially the solid fuel, char, and the condensable fuel, tar, produced by the pyrolysis; performing a double cleaning of the solid part obtained from pyrolysis through a mechanical separator and a chemical and electrical washing in a cleaning element; separating, with a thermal separator, tar from gases produced by the pyrolysis process, the thermal energy removed from the pyrolysis gases to separate syngas from tar being completely recovered in the gasifying device; completely gasifying tar and char produced by the pyrolysis process, such gasifying being performed by controlling both the amounts of water and air to be inserted in the system, and the gasification temperature, in order to keep the heat value for gases reinserted, through ducts in the mixer, into the pyrolyzer as high as possible; if the amount of char and tar is excessive, sending the extra amount to the mixing chamber and cyclically pyrolyzing and gasifying it; if the amount of tar and char is not enough to generate, from its gasification, the necessary heat for pyrolysis, then using syngas and possibly an auxiliary fuel; separating the solid products exiting the rotating drum from the gaseous products in the centrifugating device; collecting the solid products from below and dividing them through the mechanical system into char and stabilized solid residuals, inerts; subjecting the char going out of the mechanical system to other chemical and electrical processes, that allow its further separation from inerts; subjecting the gaseous product going out of the centrifugating device to a separating step for syngas and tar, by cooling gas going out of the centrifugating device, the cooling process occurring with air, and by previously injecting water, that also favors the gasification of the whole tar and char; filtering gas produced by gasification with a mechanical system to recover solid residuals, that are further separated into char and inerts, char recovered thereby being again inserted in the rotating drum, mixed in the mixing chamber both with tar and hot gas deriving from gasification, and with wastes to be disposed of and possibly with additives. EXAMPLE - No suitable example given.