GB2499728A: The invention relates to a screening system for the simultaneous removal of grit and screenings.

The system comprises a tank divided into a plurality of zones for the stages removal of screenings and contains at least one sewage screen, preferably two. The tank is attached to a sewage channel and receives sewage flow from an upstream point of the channel and then directs the sewage flow through the sewage screens, and then returns the screened sewage flow back into a channel at a downstream point, or directly to a downstream treatment.

The tank is configured to decrease the velocity of the sewage flow in the tank relative to the channel, such that grit can settle at the bottom of the tank. The sewage screen comprises a working screen surface, i.e. a conveyor belt curtain, a portion of which lies in a substantially horizontal plane, and it positioned below the invert level of the sewage channel at the upstream point. Later embodiments relate to screens, tanks and methods of screening sewage using said system