This is the part were glass, paper, and metal are separated. Before this the items were shredded. Glass and paper go to a different facility.
Metal and plastic slide under the HUGE magnetic drum. It is designed grade things like wire hangers and tin cans.
Items are sorted three ways. Ballistic sorting retains 3D material like plastic bottles. It also sorts things out like plastic bags. Optical sorting uses infrared lights to scan through a thousand objects a in a MINUTE. Human sorting makes sure materials ares sorted correctly.