Abstract: A device including an annular rotary tray (1) surrounding a central space (4) housing a waste infeed and discharge assembly (14). An adjustable flap (10) selectively urges the waste on the rotary tray (1) towards the edge or the center thereof. A loading belt (6) delivers the waste onto the rotary tray (1). As the rotary tray (1) rotates in one direction, the adjustable flap (10) gradually urges the waste towards personnel located at the periphery of the tray or towards a discharge chute. When the rotary tray (1) is rotated in the opposite direction, said adjustable flap (10) returns uncollected waste to the central space (4) for discharge.