Step screen

for wastewater treatment

The FSM Center Flow Screen was developed to deal with particular problems associated with waste water pre-treatment and raw water intake. FSM is working in this field since 1973. The first machines are used to generate cooling water for power plants from rivers. Parallel to the increasing demands of users, FSM introduced modifications to the basic design. These have resulted in an optimum product for the preliminary treatment of waste or river (sea) water - providing high performance coupled with low operating costs. The Center flow screen is a very fine screen with a high screenings capture rate and excellent protection for membrane systems. Functional principle: The unscreened water enters the screen inlet which is in the middle of the screen frame and is effectively screened as it flows from the inside to the outside through both sides of the screen filter elements. The filter elements form a continuous filter belt which is cleaned by a spray bar at the upper deflection point. The water flows through the screen elements which are covered either by a woven wire mesh made of stainless steel with up to 3 mm openings or with perforated plates made of stainless steel or UHMWPE from 1 up to 12 mm openings which create a barrier to the passage of suspended contaminants and removes them for disposal. With mesh smaller 3 mm the horizontal space between the adjoining panels is positively sealed to prevent solids escaping thru the gap as would be the case if it was not sealed. The cleaning process can be assisted by an optional brush in dependence on the screenings load, if perforated plates are used.