Mechanical Filtration: The First Line of Defense
PP Cotton Filter
PP cotton filter, also known as melt – blown PP filter, is made from non – toxic and odorless polypropylene particles.
These particles are heated, melted, extruded into filaments, and then formed into a tubular filter element through processes like traction and collection.
Its structure is designed with a multi – layer gradient.
The outer layer consists of coarser fibers, which are relatively loose, while the inner layer has finer fibers and is more compact.
When water passes through the PP cotton filter, large – sized particulate impurities such as sand, sediment, and rust are effectively intercepted.
The principle behind this is simple yet efficient.
As water flows from the outer layer to the inner layer of the filter, the gradually decreasing pore size traps particles.
Even particles smaller than the pore size can be caught due to a phenomenon called bridging, where particles get stuck between the fibers.
This makes the PP cotton filter highly effective in removing visible particulate matter, protecting downstream components of the water purifier from potential damage caused by large impurities.
It is often placed as the first – stage filter in water purifiers, acting as a crucial preliminary barrier.
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Microfiltration Membrane
Microfiltration membranes have a pore size typically ranging from 0.1 to 10 micrometers.
These membranes are made from a variety of materials, including both inorganic substances like ceramic and metal, and organic polymers such as natural and synthetic polymers.
Their main function is to remove suspended solids, bacteria, and some larger macromolecular colloids from water.
The separation mechanism of microfiltration membranes is mainly based on physical sieving.
Water molecules and small dissolved substances can freely pass through the tiny pores of the membrane, while larger particles are retained on the surface of the membrane.
For example, in water treatment plants, microfiltration membranes can significantly reduce the turbidity of water by removing suspended particles that cause cloudiness.
Mechanical Filtration: The First Line of Defense
