Filter press is a front-end machine used in chemical dehydration. Although the filter press is generally operated intermittently, with large investment in infrastructure equipment and low filtration capacity, it is still widely used in some small sewage plants because of its advantages such as large filtration driving force, high solid content of filter cake, clear filtrate, high solid recovery rate and low consumption of conditioning drugs.
The filter press is a group of filter chambers with alternately arranged filter plates and filter frames. There are grooves on the surface of the filter plate. The protruding part is used to support the filter cloth. The corners of the filter plate and the filter frame are provided with through holes, which form a complete channel after assembly, which can lead in suspension, washing water and lead out filtrate. There are handles on both sides of the plate and frame supported on the beam, and the plate and frame are pressed by the pressing device. The filter cloth between the plate and the frame acts as a gasket. The suspended hydraulic pressure is fed into the filter chamber by the feed pump to form filter residue on the filter cloth until the filter chamber is filled. The filtrate passes through the filter cloth, along the filter plate groove to the corner channel of the plate frame, and is centrally discharged. After filtration, wash the filter residue with cleaning water. When washing Huangpu, sometimes compressed air is introduced to remove the remaining washing liquid, then open the filter press to remove the filter residue, clean the filter cloth, re press the plate and frame and start the next working cycle.