Exe-Precise Process Equipments Scraper Strainer is a motorized unit designed for the continuous removal of suspended solids from intake, process and wastewater flows. These units can handle heavy solids loading with particles as small as 75 microns and as large as 150mm (6" stones). Our strainers have been installed on applications where backwash strainers have suffered premature clogging, such as black liquor, heavy oils, wax, unprotected river water intakes and boiler waste slurries.
Cleaning is accomplished by a spring-loaded blade and brush system managed by a fully automatic control system. The blades remove larger solids while the brush clean out the individual slots of the wedge wire filtration element, removing smaller particles. The spring-loaded mechanism maintains blade and brush contact with the screen at all times. A separate blow down timer allows the accumulated solids to be expelled from the bottom of the strainer vessel where they are collected during the scraping cycle. Having a separate blow down cycle allows our scraper strainer to use far less fluid for cleaning than competing backwash designs.