Larger solids may represent a significant fraction of the total pollution load. They can cause blockage of important parts of the wastewater treatment and may dissolve quickly making it more difficult to remove them from the wastewater. Hence a screen is applied to remove larger solids from the water.
This screen has a self-cleaning ability, reducing its every day cleaning requirement. The self-cleaning ability is a result of the shape of the slots of the screen. The screen plate is slightly curved and consists of triangular shaped wires that have been welded on support rods. The distance between the wires is smallest on the outside and biggest on the inside. The triangular shape of the maze makes it very difficult to block.