Screw press consist of: screw conveyor for continuous discharge of sludge, inclined bowl, both moving and stationary discs, variable screw speed and variable torque.
Screw Press is made of a cylinder containing the screw, moving and stationary discs, solid chamber, motor and gear. A strong and self standing chasis support the working parts, together with flow accessories and safety components. Screw Press has many features to increase the dryness, the solid handling and the cleaning, like: -the power is adjusted automatically to the compression profile, mantaining the required dryness for every changing condition.
Normally after flocculation, the waste water is fed into the bowl and moves through the inclined conical bowl with the screw rotation. The solid part is dewatered by the moving discs, while the water exits between the disc gaps. Solids loses more water while moving through the bowl, thanks to the pressure generated by the conical shape. The last sector of the bowl generates more muddy water which is collected in a dedicated tank and it can be pumped back to the condensing tank. Pressurized water is sprayed on the drum, automatically at periodic intervals for cleaning purpose. If the load of solids changes, the pressure cone automatically adjusts the compression rate to keep constant the required dryness.