Screw Press Working Principle

The screw press working principle combines three fundamental dewatering mechanisms in a single device: gravity drainage, mechanical compression, and filtration. A slowly rotating screw shaft conveys polymer-conditioned sludge through a progressively narrowing channel. As the screw pitch decreases toward the discharge end, internal pressure increases, forcing water through the surrounding filtration elements. The result is a continuous stream of dewatered sludge cake and clear filtrate.