The modular system for the processing, storage and / or disposal of hazardous wastes is disclosed. In an exemplary embodiment, wherein the modular system includes a container adapted to receive sealingly the hazardous waste; A first cell having a first region for operating the container; And a second cell having a second area for manipulating said container, said second cell is separated from the first cell, the first cell is maintained at a first pressure and the second cell has a second is maintained at a pressure, it said first pressure is less than the second pressure. The first cell may include a filling station and said filling station, (a) a blender that is configured to mix the hazardous waste and the additives; (B) a hopper connected to said mixer; And (c) can be connected to said hopper and comprising a filling nozzle that is configured to transfer the hazardous waste and additive mixture into the container. It may further include a gas subsystem, wherein the filling station off with a vacuum nozzle that is configured to be coupled to the vessel. The second cell may include baking and sealing station configured to seal the filling port of the container. The baking and sealing stations are welding stations, baking may include a gas system-off with a vacuum nozzle that is configured to be connected to the furnace and out of the container. The system includes a third cell, and may include a fourth cell, it said third cell is the first being isolated from the first cell and the second cell, the second cell and the third cell is the second cell, the container It is adapted to transfer from the third cell. The fourth cell is isolated from the first cell, the second cell and the third cell, said third and fourth cell is a cell is configured such that the container is the second transfer four cell from the third cell.