Filter Press – Filtration On Support

Filter Press – Filtration On Support: This process consists of a filtration process wich is achieved by passing a fluid containing solid particles through a support (canvas, felt, membrane.) on which the particles deposit themselves under the shape of an increasing thickness cake. Larger particles are retained on the filter medium and begin to form a thickness of cake through which other smaller particles are filtered. The resulting filtrate being more or less pure. The operation is batch.

Teaching objectives

Study of the support and filter resistance.
Verification of Darcy’s law.
Determinination of the curve P=f(Q) and identification of the various flow rates. (For a ‘concentration’ of pollution to treat and a given pressure, we can trace t/v = f(v).
Determination of sealing point.
Estimation of cake porosity.

Technical specifications

Filter-press : frame in cast iron
8 polypropylene plates for 15 mm cakes.
Pneumatic pump with polypropylene membrane.
2 transparent tanks with drain and tap ; 1 with level measurement.
1 variable speed stirrer.
2 manometers.
Regulator with filter for compressed air.
3 Flowmeters (feeding, permeate, measurement of pressure drop with water).
The unit is mounted on a stainless steel frame with aluminium nuts. The feed system of the pump is in flexible PVC piping.
The proposed filter-press enables the study of performance variations for imposed hydraulic conditions (constant or variable flow, variable or constant pressure).
A range of 0 to 5 bars is sufficient to carry out a study. The pneumatic membrane measuring pump offers a wide flow and pressure range.
The pump is adapted to viscous, loaded or abrasive solutions.