To enable the screening of the particles having the size which had been considered to be difficult to screen, to continuously enable the separation of large bulk of waste, to lower the energy applied to a crusher and to enable metal separation with low voltage in the voltage applied to a corona generating electrode.

In the separation system, plural electrostatic separation devices P (P1, P2 and P3) are arranged above and below and also the crusher R for crushing the waste to a granular material having a separable particle size and a conveyor device Q for transporting the crushed material on the uppermost step electrostatic separation device are mounted. The crusher R is constituted with plural holding plates R2 stuck to a rotary shaft R1 and plural classes of hammer body (r) provided along the rotating outer peripheral edge of the holding plates R2. In the hammer body (r), plural hammer plates are mounted freely rotatably to the hammer shaft disposed between each holding plate R2.