NOVELTY - Treating waste to produce solid derived combustible involving drying and compaction involves: drying by injection of drying fluid in drying section (6) and injection of waste so that waste is dragged from fluid from entry (9) to exit (10), drying section has greater than or equal to 2 chambers (15) in fluid communication by passage (11) at progressively widened section to subsequent chamber so that waste in entry passes to subsequent chamber by passage when weight is reduced by drying, by permanence in chamber as to be able to be intercepted and transported by drying fluid to subsequent chamber by passage.    USE - For treating waste (preferably urban solid waste (USW)) for production of solid waste derived combustible (WDC), which is gasified to obtain syngas that is combusted to produce heat and electric energy; where heat produced is injected into gas/oil diathermic exchanger to heat organic fluid that performs thermodynamic cycle inside turbo-generator to produce electric current (claimed).    ADVANTAGE - The method provides improved method for treating waste that is non-separated urban solid waste (USW), to produce solid waste derived combustible (WDC), which is suitable for production of energy, by allowing waste to dry and separating treated waste from air in such way as to obtain high-calorific power WDC finished product. The method further allows obtaining final WDC purified from pollution agents such as heavy metals and plastics; and exploiting purity of WDC, its high calorific power and compactness to gasify it to obtain syngas to be burnt to produce electric energy. The method further includes closed cycle of combustion so that heat obtained from combustion of syngas is used to feed drying process of waste and lowers consumption required for production of WDC itself. Unlike traditional drying processes, during drying in drying section, waste that enters in drying section from one side passes to subsequent chamber towards exit only when it reaches lightening, due to progressive drying for maintenance in chamber, which allows it to be lifted and transported away from drying fluid towards subsequent chamber through appropriately calibrated passage. The calibration of passage allows selecting permanence of fluid in each chamber on basis of quantity of desired drying. Each chamber has therefore baffle provided with calibrated opening that forms passage, which serves as sieve. The openings of baffles are in line and progressively growing in such way to form cone that widens from entry section to exit and arranged along longitudinal central axis of section. Advantageously, after drying of waste, separation of drying fluid from dried waste is carried out in aeraulic separator. The process therefore allows obtaining absolutely dried and very compact WDC, since it has been absolutely separated from drying flow. The heat produced by combustion of syngas obtained by gasification of WDC is re-circulated at least in part into closed circuit to re-conduct it to drying section, and allows significant energetic saving.    DETAILED DESCRIPTION - Treatment of waste (preferably urban solid waste (USW)) for production of solid waste derived combustible (WDC), involving sending waste along transformation path that comprises drying waste and compaction of dried waste to obtain solid WDC, involves: drying involving injection of drying fluid (preferably air) into drying section (6), and injection of waste to be dried in such way that waste is dragged from fluid from entry (9) in section towards exit (10), drying section comprises greater than or equal to 2 chambers (15) arranged in succession and in fluid communication between them through passage (11) at progressively widened section from chamber towards subsequent one so that waste in entry in section on one side passes to subsequent chamber through passage when reduction of weight is obtained due to progressive drying, by permanence in chamber, in such way as to be able to be intercepted and transported by drying fluid towards subsequent chamber through passage. The drying fluid and waste are introduced into drying section from same side in equi-current. The drying fluid has temperature of 70-150 degrees C. After drying of waste, separation of drying fluid of waste from dried waste into aeraulic separator is performed, and involves entry of waste to be dried dragged by drying fluid into separator through entry of separator and suction from exit placed at different height with respect to entry part, where height is greater than or equal to section of separator, and separator has much greater section with respect to its entry section, in such way that flow of waste dragged in separator has speed fall in correspondence of its entry such as to fall by gravity on bottom of separator, while drying flow is suctioned through exit. Before drying, grinding of waste and subsequent screening of ground waste is performed in such way as to obtain humid-organic waste separated from dry waste and form two distinct transformation paths. The screening involves advancement of waste along rotating-drum screen having net provided with screen holes in such way that parts that have smaller sizes than diameter of holes of screening mat and greater weight, fall towards bottom of machine on conveyor belt, while parts having greater size than diameter of holes of screening mat and minor weight advance towards belt, forming two distinct paths of humid-organic and dry waste. At end of production process of solid WDC, subsequent gasification of solid produced is performed to obtain syngas, which is subsequently combusted. The heat produced by combustion of syngas is re-circulated at least in part in closed circuit to re-conduct it to drying section. An INDEPENDENT CLAIM is included for plant for production of solid WDC from waste (preferably USW) along transformation path comprising: drying section of waste, and compaction section of waste to obtain solid WDC, where drying section comprises entry into which drying fluid (preferably air) and waste to be dried are injected in such way that waste is dragged by fluid towards exit section, and drying section further comprises greater than or equal to 2 chambers arranged in succession and in fluid communication between them through progressively widened section passage from chamber towards subsequent one, in such way that waste in entry in section from one side passes to subsequent chamber through passage when reduction of weight is obtained due to progressive drying because of permanence in chamber such as to lighten waste, so that waste can be intercepted and transported away from drying fluid towards subsequent chamber through passage.    DESCRIPTION OF DRAWING(S) - The figure shows drying section in method for treating waste to produce solid waste derived combustible.    Drying section (6)    Sieve (8)    Entry of drying section (9)    Exit of drying section (10)    Passage (11)    Chambers. (15)