The document summarizes the filter leaf, which is an apparatus used for surface filtration. It consists of a frame enclosing a drainage screen or grooved plate covered with a filter cloth. Vacuum is applied to increase the filtration rate. Filter leaves are versatile, provide a simple form of batch filtration, and can be connected in parallel to increase surface area. They are used to filter dilute suspensions around 5% solid content. Advantages include simplicity, moderate labor costs, and high washing efficiency.

1. FILTER LEAF
SRUTHI PRABHA K
ASSISTANT PROFESSOR
KARUNA COLLEGE OF PHARMACY, PALAKKAD

2. FILTER LEAF
Principle:-
Mechanism- surface filtration
• Filter leaf is an apparatus consisting of a longitudinal drainage
screen covered with a filter cloth
• Vacuum applied to increase the rate of filtration

3. FILTER LEAF
Construction
• A narrow frame enclosing a drainage screen or grooved plate
• Frame available in different shapes- circular, square, or
rectangular
• The whole unit is covered with filter cloth
• The outlet for the filtrate connected to the interior of the frame
through suction

4. FILTER LEAFworking

5. FILTER LEAF
Use
• Dilute suspension - solid content about 5%
Advantages:
• Versatile piece of equipment
• Simplest form of batch filter
• A number of filters can be connected parallel to increase the
surface area for filtration
• Labour costs fairly moderate
• The efficiency of washing is high
• Slurry can be filtered from any vessel simply immersing the
filter in a vessel of water can wash the cake

6. FILTER LEAF
Sweetland filter

7. FILTER LEAF
• A number of filter leafs are connected to a common outlet-
provides a large area for filtration
• E.g. sweetland filter

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