Successful performance of PWL ProCat L rake screens at STP Steinhof in Brunswick

21 Mar 2014

pdfPWL Ref Steinhof ProCat L


During summer 2011 PWL Anlagentechnik installed four new rake screens, of the type PWL ProCat L with a 6 mm gap width, together with two new screenings washing screw presses, at the wastewater treatment plant in Brunswick.

The high efficiency and operational stability of the PWL ProCat rake screens and the trouble-free completion of the reconstruction have convinced the operator.

The ProCat Rake Screen combines the advantages of continuous belt screens with functional mechanics and an inclined screening surface to reach a maximum flow cross section. The revolving conveyor chains are arranged together with the reverse, tension and drive units within the self-supporting stainless steel frame. The scraper blades are mounted to the revolving conveyor chain. If necessary, the number of blades can be changed. Thus, high rates of scraping can be realized and peak loads handled. Guiding rails avoid drifting of scraper blades.

The inclined screen surface with one active screening area only (the medium has to pass just one “barrier”) can be replaced easily as it is a separate module. It consists of flow-enhanced triangular profiles. Therefore, this screen offers optimal hydraulic features at moderate flow velocities. The screening area is cleared continuously by the revolving scraper blades and the screenings are conveyed to the discharge area. There, it is completely discharged by a scraper mechanism which is driven by the revolving conveyor chain.

For maintenance purposes the screen can be swivelled out. The PWL ProCat Rake Screen works without use of spray water. Therefore, a water connection is not necessary. Due to its design this revolving screen is robust towards grit and rubble. The complete encapsulation guarantees for hygienic surroundings.