SCREW PRESS

The screw press, is a compact, energy-efficient, and low-speed sludge dewatering equipment used in wastewater treatment plants. It dewaters sludge by compressing it using a rotating screw, removing the water and leaving a dry sludge cake behind.

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How a Screw Press Works

  • Thickened sludge is fed into the inlet of the screw press
  • The rotating screw pushes the sludge forward
  • In the press zone, the screw compresses the sludge in a narrowing space
  • Water is filtered out through the screen (as filtrate)
  • The dewatered sludge cake is discharged from the outlet

    Main Components of a Screw Press

  • Screw (shaft)
  • Motor and gearbox (low-speed drive system)
  • Washing system (prevents clogging)
  • Polymer dosing unit (improves sludge consistency)
  • Performance Characteristics:
  • Inlet sludge dry solids: typically 0.5–3%
  • Outlet sludge dry solids: 15–25% (depending on sludge type)
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