Factors affecting filtration

FACTORS AFFECTING FILTRATION

1. UNIT IV 10 /10/2020

2. FACTORS AFFECTING FILTRATION   Properties of Liquid- Density, Viscosity, and corrosiveness Properties of solid- Particle shape, Particle size, particle charge, density, particle size distribution, rigidity or compressibility of the solid under pressure and tendency of particle to flocculate or adhere together. Proportion of the solids in the slurry- rate at which filter cake is formed Objective- whether solids or the liquid or both are to be collected Temperature of the suspension

3. FACTORS AFFECTING FILTRATION   Surface area of the filter medium- equation rate of flow of filtrate is inversely proportional to the specific surface area of the filter bed. On the other hand if the surface are of the filter media is considered, the rate of filtration is directly proportional to the surface area of the filter medium. Pressure drop across the filter- Rate of filtration is directly proportional to the overall pressure drop across the filter medium and filter cake Pressure drop can be achieved by, Gravity- Maintain a head of slurry above the filter medium. Pressure developed is depends on the density of slurry. As a rough guide head of 10meters of water creates a pressure diff of 100Kpa

4. FACTORS AFFECTING FILTRATION   Applying pressure- Pumping the slurry onto the filter. Pressure difference obtained by this method is greater than that of achieved by reduced pressure. Industrial plant may be operated at pressure upto 1500Kpa. Reducing pressure- Pressure underneath the filter medium may be reduced below atmospheric pressure by connecting the filtrate receiver to a vacuum pump. This creates a pressure difference across the filter. Centrifugal force- CF can be used to increase the rate of filtration. Viscosity of filtrate -Rate of filtration is inversely proportional to viscosity.

5. FILTER MEDIA

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11. FILTER AIDS

12. FILTER AIDS

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