The document discusses a drum filter, which is a surface filtration device used to filter slurries. It consists of a horizontally mounted, perforated metal cylinder that is 3 meters in diameter and 3.5 meters long, providing 20 square meters of surface area. As the drum rotates, slurry is deposited on the perforated surface and a vacuum pulls liquid through the filter cloth, leaving a solid cake that is continuously removed. Drum filters can filter concentrated slurries continuously at low labor cost due to their large surface area and ability to control cake thickness by varying rotation speed.

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

2. DRUM FILTER

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Principle :
❖ Surface filtration
❖ Filtering the slurry through sieve like mechanism on a rotating
drum surface, under the conditions of vacuum
❖ Compression, drying, removing the filter cakes are possible

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Construction:-
❖ A metal cylinder mounted horizontally
3m diameter
3.5 m length
20 m square surface area
❖ Curved surface is a perforated plate
Which support the filter cloth

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❖ The annular space of the drum is partitioned in to several
compartments
Each compartment is connected by an internal pipe via rotating
valve in to the centre of the drum

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working

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working

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❖ All these steps are completed in one revolution per minute
❖ Now the drum is ready to receive a fresh lot of slurry

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Uses
❖ Used for continuous operation
❖ Slurry containing high proportion of solids up to 15- to 30 %
can be filtered
❖ Used to prepare penicillin

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Advantages:-
❖ Cake is removed simultaneously during operation . used for
concentrated slurries
❖ Labor costs low
❖ Provides large surface area
❖ Speed of rotation can be varied and thickness can be controlled

13. DRUM FILTER
Disadvantages:-
❖ Expensive equipment with complex function
❖ It contain moving parts
❖ Require a number of accessories such as vacuum pumps,
vacuum receivers, traps etc

14. THANK YOU