DESCRIPTION AND WORKING PRINCIPLES
The step screen is a mechanically cleaned screen that is ideal for inlet works of treatment plants, pumping stations and water inlet structures. It consists of a metal frame provided with a filtration area composed by fix and mobile lamellas. The distance between fix and mobile lamellas represents the screen meshes section. The frame is installed in the channel with an inclination angle usually 55°; wastewater passes through filtration area (lamellas) and screenings are captured and lifted up by a chain. Screenings are removed from the filtartion area and discharged .