Utilises the natural flow of water passing under a weir, through the wedge wire deck, which is usually mounted horizontally 300mm below the water level. The fine solids that carry through the narrowing zone of the wedge wire with the natural upward current, create a floc blanket on the face of the wedge wire deck. As a result this filters fine material not amenable to physical flocculation.
The majority of the remaining suspended solids caught within the narrowing zone of the wedge wire filter physically flocculate. Thereby increasing their settlement velocity and thus causing them to settle to the bottom of the tank.
A reduction in suspended solids of up to 50% will occur with a typical flow rate of 1M3/M2/Hr. In addition, the Biological Oxygen Demand (BOD) associated with the suspended solids removed will also be reduced by between 20% – 30%.