'What is Depth Filtration'?
Depth filtration, as it
suggests, is the process of filtering through
a depth of media. To obtain retention of
particles in the depth media, two events
occur known as mechanical and adsorptive
retention.
Mechanical retention;
Mechanical retention is when a particle
is physically restricted by means of interception,
sieving or bridging.
Adsorptive retention;
Adsorptive retention refers to the adhesion
of particles to the filter media, this phenomenon
occurs due to the electrokinetic properties
and hydrophobic characteristics or fibres.
Also known as Van der Waals force or electrostatic
force.
In general, depth filters are manufactured
with relatively thick media that requires
the fluid to travel through a tortuous path
as it proceeds from the upstream surface
of the filter to the downstream surface.
As the fluid twists and turns during its
journey, decreasing sizes of all particles
become trapped and adsorbed as the matrix
of fibres becomes tighter.
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