Membrane filter elements

Filtration/solid treatment and dewatering - in one step

Membrane filter elements are commonly used in processes where both filtration/solid treatment and a dewatering process is required. Examples are in production of titanium dioxide, in sugar factories, fractionation of edible-oil and so on. A membrane plate has flexible expandable walls able to squeeze out surplus moisture from the cake

A squeeze-media is fed into the plate and moves the membranes towards the center of the chamber. When the squeezing is completed the media is pumped back to the storage tank. Depending on temperature and suspension it is possible to press up to higher pressures than by traditional dewatering methods.

The technology is sensitive and needs to be fully controlled by using advanced programs for checking temperature, speed of squeezing and minimum thickness of the cake.

Successfully used the technology provides normally high flows out from filter, efficient cake washing as well as a higher dry-matter content in the cake Membrane filter elements are manufactured to the same size as recessed plates and it is even possible to use them in combination with standard plates.

It is important to stress that one technique does not replace the other. However, in those instances where a filling-limit in the chamber can be reached that fulfils other requirements   for treatment of the suspension, this technology makes possible all other sequences and demands for complete treatment related to both cake-washing as well as an effective dewatering stage.

Where it is possible to use membrane technology the total time in the dewatering step can be shortened as well as allowing for the
possibility of treating the cake.