- high dry solids content in the filtration cake (higher than with the chamber filter press) => lower costs of transport and storage of the cake
- shortened filtration cycle – compared to the chamber filter press it is possible to perform more filtration cycles over the same time
- adaptability to the changing filtration conditions – e.g. differences in the suspended solids concentrations in the fed suspension
- possibility of efficient washing of the filtration cake– controlled pressure of membranes ensures continuous flow of washing liquid through the cake, thus the substances are washed out of the cake and the required purity is guaranteed
- smaller size of the filter press given the same performance compared to the chamber filter press
- Energy cost savings
- Higher throughput rate
- Higher dry solids content
- Shorter filtration cycles
- Reduced water consumption due to reduced wash times
- Improved wash results
- Reduced air consumption during blow-drying
Fields of use:
- during filtration, when the pressure can significantly reduce the filtration period
- when efficient washing or cake blow is required
The working room of the Membrane Filter Plate consists of chambers, limited by two adjacent Membrane Filter Plate with recesses in the central part. Unlike the chamber plates, the drainage draining the filtrate is located on movable membranes serving for pressing and „wringing“ of the filtrated cake.
Water or air under pressure is used to compress the membranes. Once the filter press is filled with the suspension, this medium is fed to the room under the membranes and its subsequent lifting compresses the cake and pushes out the residual liquid. The liquid passes through the cloth and is discharged out of the filter press.
The thickness of the filtration chamber is usually 30 – 50 mm before compressing, by compressing the membrane it is reduced most often by 20 – 40%.
The suspension is fed via a central or corner inlet passing through the whole set of Membrane Filter Plate. The filtrate is drained by drainage on the membrane surface (under clothes) and then by channels drilled inside the plates out of the filter press.
Filtrating (filling) pressure before the start of the membrane compression is usually 8 bars, it rises up to 15 bars during compressing (structurally, we manufacture filter presses to a maximum pressure of 30 bars).
The filter presses are equipped with a security system, which will not enable opening of the filter presses if the system of membrane compression was not previously decompressed. This prevents from damaging to the membranes by accidental opening of the filter press.
The filtration plates including membranes are standardly made of polypropylene, another material can be chosen.
Design with a combined set of plates:
The membrane plates can be alternately interlaid with chamber plates, which creates the so-called combined set of plates. Each chamber is then closed on one side by a chamber late and by a member plate on the other side. Unlike in a fully membrane filter press, the pressure is exercised on the cake only on the side of the membrane plate. The results of filtration are comparable with a fully membrane filter press. The use of the combined set of plates results in a reduction of the acquisition costs.
The table below shows only indicative information for the filtration chamber thickness of 25 mm, the volume stated is the volume before squeezing the membranes. Precise sizing and dimensions of the filter press and further information (e.g. performance parameters, description of the equipment) will be specified in the offer based on your specific instructions. The filter presses are always designed with respect to the quantity, origin, composition and characteristics of dewatered suspension.