A membrane filter press can remove more liquid from a suspension than a chamber filter press. The cycle times are much shorter compared to the classical chamber filter press. They are used for products difficult to filtrate or products with a high focus on the separation efficiency.
In a first stage the operation principle of a membrane filter press is identical to the operation of a chamber filter press, but the feed pump is no longer the only driving force for filtration. As with a recessed chamber filter press , the chambers are first filled by a feed pump to a preset maximum pressure. In a subsequent phase, a membrane is inflated in each filter chamber by means of air (up to 7 bar) or a liquid (up to 50 bar). As result, the cake volume is reduced in each chamber by inflating the membrane , to remove more liquid from the cake. The dry-matter content of the filter cakes is noticeably higher and more homogeneous.
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