Filtration, cake filters & principles of cake filtration

Filtration
Principle of cake filtration
Cake filters
Types of filters

1. Filtration, Cake filters & Principles Of Cake Filtration

2. Content Filtration Principle of cake filtration Cake filters Types of filters Filtration, Cake filters & Principles Of Cake Filtration

3. FILTERATION The separation of solids from a suspension in a liquid with the help of a porous medium or screen which retains the solids and allows the liquid to pass is termed filtration .

4. Filtration In the laboratory, the suspension is poured into a conical funnel fitted with a filter paper. In the industrial equivalent, difficulties are encountered in the mechanical handling of much larger quantities of suspension and solids . A thicker layer of solids has to form and, in order to achieve a high rate of passage of liquid through the solids, higher pressures are needed, and a far greater area has to be provided.

5. Factors affecting rate of filtration: Pressure drop across the feed inlet and side of filter medium. Area of the filtering surface. Viscosity of the filtrate. Resistance of the filter medium. Resistance of the filter cake. Types of filtration: Constant pressure filtration Constant rate filtration

6. Principle of filtration

7. Principles Of Cake Filtration In cake filtration, the feed to be handled is termed as slurry, the bed of deposited solid on a porous membrane is termed as cake , and the clear liquid leaving the filter medium is termed as filtration . A typical cake filtration operation is shown in fig. During the initial period of flow, solid particles are trapped within the pores of a medium forming the true filter medium. The liquid passes through the bed of the solid and through the filter medium. In the early stage of filtration, the rate of filtration is high.

8. This is due to the fact that as the cake gradually builds upon the medium, the resistance to flow progressively increases. As the thickness of the cake increases resistance to flow of filtrate increases rate of filtration gradually decreases. If rate is maintained to be constant then pressure difference driving force (- P) will increase.

9. Type of Filter Cake Filter Clarifying Filter Cross Flow Ultra Filter

10. Cake Filter A  filter cake  is formed by the substances that are retained on a filter .  The filter cake grows in the course of filtration , becomes "thicker" as particulate matter is being retained.  With increasing layer thickness the flow resistance of the filter cake increases After a certain time of use the filter cake has to be removed from the filter, e.g . by back flushing . Filter cake

11. Examples of Cake Filters Filter presses Belt filters Vacuum filters: - Rotary vacuum belt filters - Rotary vacuum precoat filters - Vacuum disk filters

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