Filter Presses - Typical Applications

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The choice of a recessed filter press, plate and frame filter or membrane plate filter press is determined by the application which normally falls into one of three categories, namely:
1. The separation of solids and liquids under conditions where there is sufficient solid material in the feed slurry to form a filter cake.

2. The separation of solids and liquids where there is sufficient solids to form only a thin layer on the filtering media.

3. The removal from a liquid of small quantities of finely divided solids, sometimes with the assistance of filter aids, this operation is normally described as clarification or polishing. In the first category the filter press criteria is to provide filtration area and volume for cake filtration, in the second and third categories the filter press essentially provides filtration area and the capacity for cake filtration is unimportant. For the first application a recessed plate filter press is usually recommended with the plate and frame design normally recommended for second and third category applications.

Recessed Plate Filter Press

In the recessed type of press the recess is formed by a raised rim which stands above the drainage surface and the thickness of cake formed therefore twice the depth of the recess on individual plates. The slurry to be filtered is normally fed into the filter press through a central hole that feeds each chamber at the same time. The solids are retained within the recessed hollow chamber and the filtrate passes through the media into an internal manifold or away through drain cocks or directional bibs.

Plate and Frame Filter Press

In the plate and frame type of press the chambers are formed by the use of a hollow frame which is placed between two plates whose rim or joint surfaces are nearly flush with their drainage surfaces. The slurry to be filtered is fed into the press through a manifold formed by ports in each plate and frame and delivered into each frame by suitable connecting ports. The solids are retained within the hollow frame whilst filtrate delivers through the media into a collection manifold by way of additional ports in the plates or through drain cocks or directional bibs.

Membrane Plate Filter Press

The membrane system has proved to be useful in certain applications, typical of which are the filtration of dyes, pigments and yeast slurries.

1. 630 x 630mm square, recessed plate filter press used for dewatering metal hydroxide sludges from a plating shop effluent treatment plant

2. 800 x 800mm square, recessed membrane plate filter press used in filteration of fermenting vessel bottoms on a brewery installation.

3. 1500 x 1500mm square, recessed plate filter presses used for treatment of drinking water in a large Scottish town.

Industrial Water Equipment Ltd

2nd Floor, 13 Upper Baggot Street, Dublin 4, Ireland
TEL: + 00 353 15262557

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124 / 126, North Parade, Matlock Bath, Derbyshire, DE4 3NS
TEL: +44 (0) 1629 580468

info@industrialwaterequipment.co.uk

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