A filter comprises a set of vertical recessed plates, presses against each other by hydraulic jacks at one end of the set. The pressure applied to the joint face of each filtering plate must withstand the chamber internal pressure developed by the sludge pumping system.
This vertical plate layout forms watertight filtration chambers allowing easy mechanisation for the discharge of cakes. Filter clothes finely or tightly meshed are applied to the two groowed surfaces in these plates.
Orifices feed the sludge to be filtered under pressure in the filtration chamber. They are usually placed in the center of the plates allowing a proper distribution of flow, right pressure and better drainage of sludge within the chamber. Solids sludge gradually accumulates in the filtration chamber until the final compacted cake is formed. The filtrate is collected at the back of the filtration support and carried away by internal ducts.
This includes 5 cycle which are Closing of the press, Filling, Filtration, Filter opening and Washing The production capacity of a filter press is somewhere between 1.5 and 10 kg of solid per m2 of filtering surface. For every filter press model the chamber volume and the filtering surface depend on the number of plates in the filer with pressing times are less than four hours. Filtration time depends on cake thickness, sludge concentration, specific resistance and compressibility coefficient.
Our filter press frame consists mainly in two horizontal side beams, support legs, fixed header, cylinder header and sliding header.
The closing-opening system of the filter consists in a double-acting hydraulic cylinder, manually controlled by hydraulic unit with hand lever.
The filtering plates are made of high density polypropylene, and their handles are supported on sliding guides, every plate is covered with polypropylene filtering cloths and is equipped to discharge the filtrate into the gutter or into the closed manifold.
- Filter press is suitable for almost all types of sludge
- Hydrophilic organic sludge: inorganic conditioning is often recommended to enable satisfactory cake release due to minimal adherence to filter cloth.
- Hydrophilic inorganic sludge: the filer press generally requires the addition of lime only.
- Hydrophobic inorganic sludge: it is very dense and ideal for the filter press. It is dewatered without any preliminary conditioning.
- Oily sludge: the filter press can be used to treat sludge containing light oils.