High-Rate Thickeners separate liquids from solids using hindered settling. Rotating rake arms collect settled sludge and move it toward the center discharge cone. They use minimal amounts of polymers/chemicals to drop the solids, making High-Rate Thickeners environmentally friendly.
Thickeners are operated and controlled by a touch-screen programmable logic controller system. Operating logic allows for customization of the unit for plant needs, including the ability for the Thickener to shut down without an operator being present during extended hours of operation. The hydraulic drive gives an accurate sense of torque on the rakes. At high torque conditions, a rake lift will activate to draw the rakes up from the mud. The system then steps the rake down, monitoring torque on the way.