Abstract: An apparatus for use in a sewage treatment plant comprises a settlement tank, an inlet channel for delivering an input sewage flow to the settlement tank, and a screen arrangement having a continuous belt screen for capturing screenings contained within the sewage flow to enable their subsequent removal therefrom. The screen arrangement is arranged within the settlement tank.

Abstract: A sewage screening apparatus which receives, in use, a sewage flow comprising a screen arrangement having a continuous belt screen for capturing screenings contained within the sewage flow to enable their subsequent removal therefrom. The apparatus also includes an impeller for generating a turbulence effect within the sewage flow to effect washing of the screenings contained within the sewage flow prior to their removal therefrom. The impeller is located within the screen arrangement.

Abstract: A screen assembly is described which comprises a flow channel along which sewage is intended to flow, in use, a continuous flexible belt entrained around roller or wheel means and projecting into the channel, and means for driving the belt. The belt is perforated such that relatively large solids carried along the flow channel in the sewage are trapped by the belt adhering thereto due to a pressure differential across the belt. Movement of the belt lifts such solids from the flow channel. The belt is of thickness less than or equal to 1 mm.

Abstract: A washing apparatus for washing solid fractions such as screenings or grit derived from a sewage treatment plant and contaminated with fecal material, such as fecal solids, includes a tank (11/111) for receiving aqueous liquid and the contaminated solid fractions, and mechanisms (23, 26, 126) for generating turbulence of the aqueous liquid in the tank to break-down the fecal contaminants. The method of washing screenings includes adding aqueous liquid and screenings contaminated with fecal material to a tank, subjecting the liquid containing contaminated screenings to turbulence to break down the fecal material and adding further liquid alone or containing screenings to the tank such that screenings and aqueous liquid containing finely divided fecal material flow from the tank over a weir or the like for dewatering and compaction of the screenings.

Abstract: This invention relates to a grit trap which is intended for use in removing grit from a flow of sewage. The grit trap is of the kind which includes a settlement chamber which has an inlet through which the flow of sewage can flow and an outlet from which treated sewage can flow. There is also provided a grit storage chamber which is disposed between the settlement chamber and in which in use the separated grit will collect, the settlement chamber having a mixing device for promoting a desired motion to the flow of sewage entering the settlement chamber. In accordance with the invention said mixing device comprises a disc 25 which is provided with a plurality of generally radially extending blades, said disc being located just above the upper end of the grit storage chamber.

Abstract: Apparatus for removing solid material from a flow of sewage or other liquid, the apparatus having a duct through which in use sewage will flow and two screens located in said duct adjacent to each other, one of said screens being arranged to receive solid material filtered from the sewage flow by the other screen and there being also provided a vertically reciprocable lifting plate which is adapted to collect solid material from said one screen and lift it to a position which is above the upper surface of the flow of sewage.