IFT Series of Internally-fed Rotary Drum Sludge Thickeners have cylindrical drums with progressive series of screen elements that are mounted horizontally on four shaft-mounted wheels and supported on a tubular frame. The smallest openings are used to screen the influent sludge, followed by coarser elements as the sludge thickens. The screening element is either woven mesh or wedgewire. The screens are used to remove free liquids from a variety of sludges, including those with appreciable amounts of microbial particles. Sludges containing 0.5% - 3% solids can be thickened to 3% - 15%, depending on the type of sludge. METHOD OF OPERATION: The influent enters a headbox, where the energy is dissipated, and the flow is evenly distributed onto the interior sidewalls of the drum. Solids are retained on the screen surface and the liquid flows radially through the screen openings. Splash guards direct the liquid filtrate to a central drainage area, and the solids are transported axially, by flights, to the open end of the drum. The rotation of the drum allows the entire screening surface to be continuously or intermittently washed by a fixed, external, spray bar fitted with a bank of spray nozzles. Features: *304 stainless steel construction *Removable top & side enclosure panels * Drainage (filtrate) pan *Solids chute *Easily replaceable, mesh panels *TEFC motor and geardrive *Stainless steel roller chain *UHMW polyurethane wheels c/w internal bearings * External spray bar *Polymer mixing tank c/w agitator *Frame supports screen and tank
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