Product Focus: Shaftless Screw Conveyors for Treatment Plant Residuals

Aug. 11, 2020
For efficient conveyance of wet and sticky bulk materials such as dewatered sludge, grit and screenings

Dewatered residuals from water and wastewater treatment dewatering processes are ideal applications for shaftless screw conveyors available from Motion Industries and KWS Manufacturing. Wet and sticky bulk materials such as dewatered sludge, grit and screenings are efficiently conveyed with a shaftless spiral, eliminating the need for internal bearings or a center pipe.

The shaftless design provides a non-plugging conveying surface. Conveying efficiency is improved where elevation changes are required because the shaftless spiral allows for higher loading in the trough. Shaftless conveyors are fully enclosed for vapor and odor-tight construction. Standard designs include one-piece drive shafts and unique flanged spirals to ensure efficient and reliable transmission of power. A wide range of construction materials and configurations allow custom design for each application. Shaftless conveyors can be designed to travel horizontal, inclined, and even vertical to fit almost any plant layout.

Industrial plants can produce sludge and wastewater that must be treated before entering the municipal wastewater treatment system, and many industrial plants dewater their own sludge with centrifuges, belt filter presses, or screw presses. Dewatered sludge can be conveyed to storage or disposal with shaftless screw conveyors that use a high-strength MicroAlloy spiral and Ultra High Molecular Weight Polyethylene (UHMW-PE) liners. When items such as spirals, liners, drives, and seals need maintenance or replacement, Motion Industries and KWS offer a wide variety of solutions for the plant.

Upstream at the wastewater plant, grit and screenings must be removed from the flow to prevent damage to pumps and pipes. Grit consists of sand, silt and other abrasive particles. Screenings consist of large solid objects such as rocks, cans, plastic bags, sticks, rags, and leaves.

Grit and screenings are typically removed from influent using settling tanks, classifiers, and screens. Abrasive grit and screenings can be conveyed to storage or disposal with heavy duty shaftless screw conveyors that use a Super High Strength MicroAlloy spiral and ceramic liner. Motion Industries and KWS can assist the plant in developing a shaftless conveying solution that delivers long maintenance life and decreased wear in this sensitive application. WT

Motion Industries is a wholly owned subsidiary of Genuine Parts Company and a major supplier of bearings, pneumatics, hydraulics and mechanical power transmission products. KWS designs and manufactures conveying equipment for the bulk material handling industry. Visit to learn more.

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