Filter leaf

Filter leaf is an equipment used for filtration process.

1. Filter leaf ~ VAISHNAVI SALI SY.BPHARM, ROLL NO.26

2. Contents Introduction Principle Construction Working Advantages and Disadvantages Uses References

3. Introduction 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/yBgPeYzmfTB1eNAx6

7. 06 05 01 03 04 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/JjojCQDCQ3WSWoPJ8 https://images.app.goo.gl/yBgPeYzmfTB1eNAx6

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

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