NOVELTY - Modules of the plant charge waste containing organic matter (1), dry the charge (5), pyrolyze it in a reactor (2) under reduced pressure, draw off (3) pyrolysis gas and exploit (4) recovered energy and treat (8) flue gases.    USE - Used as a modular waste pyrolysis system. The waste has an organic content and a controlled size grading, which may vary over a wide range.    ADVANTAGE - A typical pyrolysis process is described, which is self-supporting in energy, in terms of carbonization and pre-drying. Care is taken to locate equipment at heights to permit gravity feed of liquids and solids, wherever possible. Heavy metals can be recovered from the solids produced, particularly when treating sludges from the purification stage. The known advantages of modular waste treatment plant are secured, deriving from containerization, ease of transport and assembly, and low cost.    DETAILED DESCRIPTION - The flue gas purification system meets applicable regulatory requirements. The dryer achieves adequate dryness using steam sent from the boiler (4) to the drying module. Separable modules are combined as an assembly. The disposition allows dried material to be recycled under gravity, to achieve the required degree of dryness, ahead of pyrolysis. Sludge and condensates from drying are led under gravity to the combustion chamber (4) to be burned. Condensate from steam feeding the dryer, is returned under gravity to the steam generator. The drying module is above the recycling installation for waste. The gas recovery system is above the reactor. The solids recovery system is located in the lower part of the reactor. A feed high in the reactor, supplies sludges and condensates from drying, by flow under gravity to the combustion chamber. Gases from the combustion chamber and steam from the steam generator are fed to the drying module. A flue gas purification system is included. Airlocks are formed by compression screws, pumps or slide valves.    DESCRIPTION OF DRAWING(S) - The figure shows an end elevation of the assembled plant modules.    Charging module for waste containing organic matter (1)    Charge drying module (5)    Reactor module for waste pyrolysis (2)    Exhauster for pyrolysis gas (3)    Energy recovery module (4)    Flue gas treatment module (8)