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Three mechanisms are involved in succession: capture, attachment and separation.

Principles of Filtration

Their importance depends on the properties of the particles to be screened out and on the filtering material used. A low flow velocity will encourage particles to attach onto the surface of the filtering matter. This phenomenon is caused by forces that are physical in origin jamming, cohesion… and by adsorption forces, mainly the Van der Waals forces. As the result of the action exercised by the previous mechanisms, the space between the walls of the matter covered with particle deposits will diminish. We then see an increased intergranular flow velocity.


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The solid particles found in liquid and colloidal particles that are more or less flocculated, do not all share the same properties and will not react in the same proportion to the various mechanisms described above. Under certain circumstances the regeneration of the filter is possible.

With high particle loads approx. Depending on the nature of the slurry, the removal and disposal of the filter cake is possible. Alluvial filtration Depth filtration Surface filtration Caption of the filtration principles.

Filter aids With high particle loads approx. These are arranged in the press so that every second plate is a wash plate.

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During filtration these wash plates act as filter plates. During washing, the outlets from the wash plates are closed and the wash liquid introduced on to their surfaces through a special inlet channel.

filtration mechanisms

The flow path for both filtration and washing when wash plates are used. The cake is removed manually after opening the press. Site news. Lesson 8.

Filtration

QUIZ 8. Lesson 9. QUIZ 9.


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Lesson QUIZ Separation equipment. Filtration may be defined as that unit operation in which the insoluble solid component of a solid-liquid suspension is separated from the liquid component by passing the latter through a porous membrane or septum which retains the solid particles on its upstream surface, or within its structure, or both.

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A broader definition could be that the fluid may be a liquid or a gas; the valuable stream from the filter may be the fluid, or the solids, or both. The separated solids are known as the filter cake, once they form a detectable layer covering the upstream surface of the medium. Filter, must provide a support for the filter medium, a space for the accumulation of the solids, channels for the introduction of the feed.

A means of inducing the flow of filtrate through the filter and medium must also be provided. The fluid flows through a filter medium by virtue of a pressure differential across the medium.