Filtration process and apparatus

Details Filtration process and apparatus Filtration process and apparatus

B - Operations, Transporting

01

D

B01D 24/36 (2006.01) B01D 24/30 (2006.01) B01D 24/46 (2006.01)

Patent

CA 2110720

It is known to filter a suspension or emulsion in a filter bed of particulate filter medium (1) by allowing the suspension to flow upwards through the filter bed simultaneously as the medium (1) flows downwards through a filtering tank (2) wherein filtration takes place. Filtration thus takes place during counterflow between suspension and filter medium. The supply of suspension takes place in the lower part (4) of the filter bed and the filtered liquid phase is taken away from a zone (8) above the filter bed. The polluted filter medium close to the bottom of the filter tank is taken out for conveyance to a washing apparatus (13) above the filter bed and after washing is returned to the upper side of the filter bed. For providing a filter which has a considerably lower construction height than previously for a given and unchanged volume of the filter medium, the washing apparatus (13) is now lowered so that its lower part is at a level below the upper surface of the filter bed.

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