Urusyo rudasanzwe rwicyuma ni imashini zihariye zagenewe gutunganya ibyuma bitarimo ibyuma byinshi. Ibi byuma, nka aluminium, umuringa, isasu, na zinc, bifite imitungo idasanzwe ituma iba ngombwa mu nganda zitandukanye, harimo ikirere, imodoka, na elegitoroniki. Urusyo rwo kuzunguruka rukoresha urukurikirane rw'urutonde rwo kugabanya ubunini bw'ibi byuma, pro,