Function
Light-fraction separation
Static curved screen
The static curved screen is a preliminary physical-filtration unit installed upstream of the water-treatment stage, used in Soil Washing, road-sweeping and construction-and-demolition (C&D) waste treatment plants. Designed to treat turbid water generated by complex feed materials, its curved screening surface separates light, floating fractions of organic or man-made origin — such as plastics, roots, wood fragments and polystyrene — that remain in the water after the washing stage. By removing these contaminants before the downstream flocculation and clarification stages, the screen prevents light fractions from interfering with sludge-floc settling and reduces the risk of pump clogging.
How the static curved screen works
The light-fraction problem
In plants treating contaminated soils or road-sweeping waste, the turbid water leaving the washing stage often carries light fractions (leaves, wood fragments or polystyrene). These floating materials do not settle naturally and are not effectively removed by flocculation.
The separation principle
The turbid water is directed onto the curved screening surface. The water passes through the screen to the next stage, while the light solid fractions slide down the curved surface and are physically separated from the flow.
Protecting the clarifier
Without this pre-treatment, the floating impurities would reach the clarifier and interfere with the settling of sludge flocs.
Protecting the lift pump
By removing the light fractions, these materials are kept out of circulation within the plant, avoiding the risk of obstruction and clogging of the clean-water lift pump.
Technology and application sectors
A screening unit designed for integration upstream of the water-treatment process.
Curved geometry
The screening surface has a concave profile that guides the flow and allows the separated solids to slide down the surface under the action of the water flow.
Plant integration
It is installed upstream of the turbid-water sump or the reaction tank, removing light fractions before the water is pumped to the clarifier and before chemical reagents are injected.
Soil Washing
Used as a pre-treatment to remove light fractions such as pieces of wood and roots present in excavated soil, before chemical conditioning.
C&D waste
Separates light contaminants such as polystyrene, waterproofing membranes and plastic fragments found in rubble.
Spazzamento Stradale
Captures organic matter such as leaves and small items of urban litter, including cigarette butts, cans and paper.
Request information
Fields marked with * are required.