A Filter Press is most commonly used to dewater sludge Made from industrial wastewater treatment plants.
Filter Press Manufacturers tell you the first stage of dewatering in a filter press is chemical conditioning. This is normally achieved by dosing a polymer into a mixed sludge storage tank upstream of the filter press. The flocculant will bind the sludge particles to larger flocs that are thicker and easier to dewater from the press.
The slurry is then introduced through the center of the press where it fills the chambers between the plates. The pressure forces the liquid through the Filter Cloth, whilst solids are retained between the plates. The filtrate flows between ridges in the plates to the corners where it discharges.
The stages are as follows:
1. The chamber is empty, but has been sealed closed by the hydraulic ram. The press is ready to receive wet solids.
2. The wet solids are fed into the chamber. The solids begin to fill the chamber void.
3. The chamber void is full. Pressure builds and water is filtered through the filter cloths.
4. The cycle time is ending. The feed has stopped, allowing the hydraulic ram to be retracted – solid cake falls from between the Filter Plate.