Sam Ziemann From - Region of Waterloo

Napier-Reid Ltd.Pressure FiltersNR - Pressure Filter - Process DescriptionNapier Reid’s pressure filtration systems are designed to carry out filtration in closed vessel underpressurized condition. As NR Pressure Filters have high filtration rate and ability to operate at higherpressure drop compared to gravity filters and the footprint is relatively smaller compared toconventional gravity filters.In NR – Pressure Filters, the incoming raw water is distributed over the filtration area of the filterthrough our unique well designed flow distribution system. The water filters down through the differentlayers of the filter bed. The filtration media mechanically strains out dirt, suspended solids, sediment,algae, bacteria, microscopic worms, cryptosporidium and asbestos, colour, odour, precipitates of iron/manganese and other impurities.The filter bed is designed to capture and hold the suspended solids and impurities throughout thedepth of the filter bed (and not just at the surface layer), hence increasing the solids holding capacity.Also the filter bed and internals are designed to prevent channeling and media upset. The capability ofNR pressure filters to operate at higher terminal headlosses and higher solids holding capacity resultsin longer filter runs and a reduced backwash water requirement.The filtered water is evenly collectedover the filtration area by our uniquewater collection system that preventschanneling and short circuiting.When the differential pressure acrossthe filter increases beyond a presetvalue, the filter bed is backwashed toremove the entrapped impurities inthe filter media bed and return thefilter to its original filtration capacity.NR filters are equipped with airscouring system and efficientbackwash water distribution systemfor effective backwash.NR - Pressure Filtration SkidOPG Lennox Power Generation StationBath, OntarioDesign Flow Rate: 197 m 3 per day2