Screw Screen

Screw screen consists of a filtration zone, where screenings are separated from water with a perforated trough and conveyed to a drying zone by an internal screw.

At the drying zone the discharge water is screened through a perforated trough to the internal screw and led through a reject water connection to re-enter the process.

Screenings leave the unit through an exit opening and they can be collected for example in a separate waste container.

A screw screen can be installed either in a concrete channel or in a separate tank, in which case it can be combined with for example a sand separator.