PRODUCTS > Filter presses > With membrane plates

Benefits
Fields of use
Description
Chamber-membrane design
Models


Benefits:

  • 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


Fields of use:

  • during filtration, when the pressure can significantly reduce the filtration period
  • when efficient washing or cake blow is required


Description:


Filtration using the membrane filter press without cake washing (includes animation 204 kB)
Filtration using the membrane filter press with cake washing (includes animation 289 kB)

The working room of the membrane filter press consists of chambers, limited by two adjacent plates 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.

Cross section of the membrane plate edge:

 
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 plates. 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.


Models:


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. In order to facilitate the preparation of correct specifications, we have prepared several questionaires.

model indication
filter plates size (mm)
filter press volume (dm3)
*filtration area (m2)
KM470
470 x 470
35 - 194
3,2 - 17,6
KM630
630 x 630
95 - 460
8,4 - 40,4
KM800
800 x 800
221 - 834
19,2 - 73
KM1000
1000 x 1000
734 - 2790
62 - 236
KM1200
1200 x 1200
1200 - 3578
114 - 336
KM1500
1500 x 1500
1400 - 6104
100 - 490
KM1520
1500 X 2000
2000 - 10000
140 - 600

*only indicative information for the filtration chamber thickness of 25 mm (before cake squeezing)