ABSTRACT
Shredders and grinders are used to reduce the size of material in the wastewater stream before treatment.
A comminutor may be used by some plants to both screen and grind material. (Material shredded by a comminutor is returned to the wastewater stream).
In some shredder/grinder units, all the wastewater flows through the unit(s) and all material is ground automatically.
In barminutors, shredder/grinder units are combined with a coarse bar screen. In this type, the shredder/grinder may be located near the screen and grind large material diverted to it, or the shredder/grinder unit may be located on the screen itself and slides up and down with the rakes.
