Reverse Osmosis Functions
Reverse Osmosis works
by using a high pressure pump to increase the pressure on the salt side of the
RO and force the water across the semi-permeable RO membrane, leaving almost
all (around 95% to 99%) of dissolved salts behind in the reject stream. The
amount of pressure required depends on the salt concentration of the feed
water. The more concentrated the feed water, the more pressure is required to
overcome the osmotic pressure.
The desalinated water
that is demineralized or deionized, is called permeate (or product) water. The
water stream that carries the concentrated contaminants that did not pass
through the RO membrane is called the reject (or concentrate) stream.
Ro Membrane 1
As the feed water
enters the RO membrane under pressure (enough pressure to overcome osmotic
pressure) the water molecules pass through the semi-permeable membrane and the
salts and other contaminants are not allowed to pass and are discharged through
the reject stream (also known as the concentrate or brine stream), which goes
to drain or can be fed back into the feed water supply in some circumstances to
be recycled through the RO system to save water. The water that makes it
through the RO membrane is called permeate or product water and usually has
around 95% to 99% of the dissolved salts removed from it.
It is important to
understand that an RO system employs cross filtration rather than standard
filtration where the contaminants are collected within the filter media. With
cross filtration, the solution passes through the filter, or crosses the
filter, with two outlets: the filtered water goes one way and the contaminated
water goes another way. To avoid build up of contaminants, cross flow filtration
allows water to sweep away contaminant build up and also allow enough
turbulence to keep the membrane surface clean.
Yazh Pure Life
RO Water Purifier Sales and Service.
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