Described herein is a plant (1) for the disposal of wastes including: - a supercritical water oxidation reactor (SCWO), - a supercritical water gasification reactor (SCWG), - a feeding system configured for feeding at least two organic currents (W1_IN, W2_IN, W3_IN, Wn_IN) of wastes to said supercritical water oxidation reactor (SCWO) and supercritical water gasification reactor (SCWG) and configured for feeding at least one aqueous flow (PW, PLS) within said plant (1), wherein said feeding system is configured for feeding said at least one aqueous current (PW, PLS) with a series flow through said supercritical water oxidation reactor (SCWO) and supercritical water gasification reactor (SCWG) and wherein said feeding system is furthermore configured for feeding said at least two organic currents of wastes with a parallel flow through said supercritical water oxidation reactor (SCWO) and supercritical water gasification reactor (SCWG) and so as to selectively feed each of said organic currents of wastes to said supercritical water oxidation reactor (SCWO) or to said supercritical water gasification reactor (SCWG). Moreover described is a corresponding method for waste disposal. Finally, an extensive description is provided regarding the possibilities of thermal and energy integration in general between the two sections of the plant (gasification and oxidation).
