A screw pump is a type of pump used in the secondary treatment of wastewater. It is used to transport sludge or thickened sludge from the sedimentation tank to the sludge treatment facilities.
The pump consists of a screw-shaped rotor that rotates within a fixed stator. As the rotor turns, the spaces between the threads of the screw form cavities that move the sludge from the inlet to the discharge port. The sludge is pushed along the screw and compressed as it moves through the pump, which increases the pressure and moves the sludge through the discharge pipe.
Screw pumps are known for their ability to handle high volumes of thick sludge and their low energy consumption. They are also relatively easy to maintain and have a long service life. They are commonly used in wastewater treatment plants, as well as in industrial applications where viscous liquids need to be pumped.
There are several different types of screw pumps, including single screw, twin screw, and triple screw pumps. The choice of pump depends on the specific requirements of the application, including the flow rate, the viscosity of the sludge, and the number of solids present in the sludge.