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How does a leaf filter collect solids during pressure filtration?
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filtration
Tap water filtration system.
In a leaf filter used for pressure filtration, solids are collected through the following process:
- Structure: The filter leaves feature a central section of coarse metal mesh that supports the filter medium—typically a woven wire screen—and allows the filtrate to escape.1
- Operation: These leaves are assembled on a frame and enclosed within a pressure vessel that also contains the slurry.1
- Collection: As the slurry is processed under pressure, a filter cake of solids is deposited onto the surface of the filter medium on the leaves.1
- Removal: Once a sufficient amount of cake has accumulated, the pressure is removed and the vessel is opened. The cake is then discharged from the leaves by applying air pressure to the filtrate line or by using a water spray.1
Compared to a filter press, leaf filters are often more cost-effective to operate because they allow for efficient washing and cake discharge without requiring the removal of the leaves themselves.1