Ultrafiltration : the revolution in water treatment
The ultrafiltration technique has been developed
in the 1970's for liquid treatment and more specifically
for the dairy industry. With its development for drinking water
production in large scale installations, hollow
fiber ultrafiltration is now recognized as a safe, efficient
and cost effective technique for water purification
for numerous applications in domestic and industrial fields.
Ultrafiltration often replaces conventional techniques
and also microfiltration thanks to its ability to remove
not only little particles but also pathogens including micro-organisms,
viruses, pyrogenic and some dissolved organic species.
UF is a purely physical
treatment able to treat any kind of water with the same
purifying efficiency.
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Membrane
A hollow fiber membrane is a small
plastic tube less than one millimeter in diameter and with a length of a
few tens of centimeters, whose wall is porous.
The pores of S2 Polymem membranes are 0,01 µm
size, that is to say 10,000 times thiner than a human hair.
Suspended matter but especially micro-organisms
and viruses of which the smallest have sizes of
0.2µ and 0.025 µ respectively are perfectly retained on the
surface of the fibers.
• Modules
The Polymem ultra filtration
cartridges are composed of several thousands of these fibers
and have a huge filtration surface thus making it possible
to treat large flows.
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Low pressure Process
Ultrafiltration is a process where the driving
force is the pressure of the liquid to be treated (0.5 to
1.5 bars). Pressurized water enters the module and treated
water (called filtrate or permeate) passes through the membrane
barrier. The retained substances are captured on the membrane
surface and periodically eliminated from the module in the
backwash effluent. |
Ultrafiltration
