The document discusses the filter leaf, which is a type of vacuum filter used for industrial batch processing. A filter leaf consists of a frame enclosing a drainage screen or grooved plate covered with a filter cloth. It works by placing the filter leaf assembly inside a container of slurry, applying a vacuum to draw the filtrate through the filter cloth where solid matter accumulates while the filtrate passes through the drainage canal and outlet. Filter leaves provide advantages such as requiring minimal floor space and allowing for high washing efficiency. They can filter materials that are flammable, toxic or corrosive.

1. FILTER LEAF
~ VAISHNAVI SALI
SY.BPHARM, ROLL NO.26

2. CONTENTS
Introduction
Principle
Construction
Working
Advantages and Disadvantages
 Uses
References

3. INTRODUCTIO
N
 The process of separating suspended solid matter from a liquid suspension is
known as filtration.
 It is passed through a porous medium that accumulate the solids, but allows
the passage of fluids.
 The porous medium used to filter the solution is known as filter medium.
 Equipments used for filtration are,
Pressure filter, Vacuum filter, Rotary Drum filter, Cartridge filter, Membrane
filter and Seitz filter

4. INTRODUCTION
 Filter Leaf comes under Vacuum filter.
 Filter leaf plays an important role in industrial batch processing.
 It consists of a frame enclosing a drainage screen or grooved plate.
 Sweetland filter is variant of filter leaf (alternative method).
 Filter leaf is enclosed in a cylindrical vessel into which the slurry is pumped
under pressure.
 A number of leaves are connected to a common outlet, to provide a large
area of filtration.
 Different assemblies of leaf filter such as Moore filter and Kelly filter are also
available which provides large surface area.

5. PRINCIPLE
 It is an apparatus consisting of a longitudinal drainage screen
covered with a filter cloth.
 It is based on a surface filtration mechanism.
 It acts as a sieve or strainer.
 Vacuum or pressure can be applied to increase the rate of
filtration.

6. CONSTRUCTION
 The filter leaf consists of a frame enclosing a
drainage screen or grooved plate.
 The frame may be of any shape; circular, square or
rectangular.
 The entire unit is covered with filter cloth.
 The filtrate outlet is connected to the frame
through suction.
https://images.app.goo.gl/yB
gPeYzmfTB1eNAx6

7. 06
05
01
0304
02
Working
of Filter
Leaf
The entire assembly is placed
inside a container of slurry
and the vacuum is connected
to outlet.
The slurry passes
through the filter cloth.
Solid matter gets
accumulate on the cloth.
Filtrate enter the drainage
canal and passes through
the outlet.
The cake is washed by
immersing the filter in
a container of water.
The air is passed in the
opposite direction which
facilitates the removal
of cake.

8. Filter Leaf during filtration Sweetland Filter
https://images.app.goo.gl/JjojCQDCQ3WS
WoPJ8
https://images.app.goo.gl/yBgPeY
zmfTB1eNAx6

9. ADVANTAGES
 It requires minimum floor space.
 Simplest form of filter used for batch process.
 Labour cost for operating the filter is moderate.
 It has high washing efficiency.
 Area of filtration can be enhanced by attaching number of leaves in parallel
direction.
 It provides high filtrate clarity.
 Cake can be easily dislodged and washed.
DISADVANTAGES
 The maximum concentration of slurry that can be filtered is only 5%w/v.

10. USES
 Leaf filters are suitable for handling flammable, toxic and corrosive materials, as
they are autoclaved and designed for hazardous environments when high
pressure and safe operations are required.
 It is satisfactory if the solid content of the slurry is not too high.

11. REFERENCES
 PV Pharmaceutical Engineering By Shalini Sharma
 https://www.slideshare.net/ritukudarha/filtration-39038033
 https://www.slideshare.net/muhammadabdullahirsh/filtration-
140913005653phpapp02
 Photo credit Ritu R. Kudarha (09,2014)
https://images.app.goo.gl/yBgPeYzmfTB1eNAx6
https://images.app.goo.gl/JjojCQDCQ3WSWoPJ8

12. THANK YOU!