A separator extracting dry chopped food waste material from wet chopped food waste material fed in fluid state includes an outer container for an internal centrifuge having a rotating cylinder with perforated walls, which contains a rotating screw that advances the wet chopped food material and separates the liquid portion therefrom; an inlet opening, which receives the wet chopped food material to be introduced into the rotating cylinder through a hollow duct inside the screw feeder, causing its upward movement and advancement; and an outlet opening, which evacuates the chopped material without the liquid portion. The outer container includes upper and lower half-shells that are monolithic and integral sanitation elements of the separator and a centering and sealing element at a coupling area, a flow-regulation valve being positioned at a lower opening to evacuate the separated liquid from the outer container.