Filtering is the mechanical separation of a suspension into its liquid and solid particles with the help of a liquid-permeable filter medium.

The filter medium allows the generally solid-free liquid – the filtrate – to pass through and holds back the solid particles as a filter cake. Both filtrate and filter cake can be recovered as a product.

Frequently, such filtration processes are combined with washing or extraction processes and so are utilised as multi-level processes.

In particular in the field of organics or in chemistry/pharmacy, active ingredients are washed or extracted from their carrier material. The wash fluid is separated as a filtrate, in order for it then to be separated from the filtrate again in the subsequent process.

The parameters of pressure, temperature and/or vacuum can also be utilised in this procedure in order to increase the motivating forces of filtration.

Vacuum is often an important instrument here for the realisation of such processes.


DVA Holland-Merten GmbH
Holland-Merten-Str. 7
06536 Südharz OT Roßla

Phone: +49-34651-372-0



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