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Reverse Osmosis - For The Most Demanding Specs
Reverse osmosis, also known as hyperfiltration, is the finest
filtration known. This process will allow the removal of particles
as small as dissolved individual ions from a solution. Reverse
osmosis is used to purify water and remove ions and dissolved
organic molecules. It can be used to purify fluids such as ethanol
and glycol, which will pass through the reverse osmosis membrane,
while rejecting other ions and contaminants from passing. The most
common use for reverse osmosis is in purifying water. It is used
to produce water that meets the most demanding specifications that
are currently in place.
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| OSMOSIS |
REVERSE OSMOSIS |
| If two aqueous solutions of different salinity are separated by a semi-permeable membrane, osmosis will cause water to pass through the membrane in the direction of the more concentrated solution, therefore diluting it. By applying sufficient pressure to the more concentrated liquid, the direction of osmosis can be reversed. In this way, we can mechanically reverse the flow and separate the concentrated solution into its constituents: the water and the dissolved solids. One part is called the permeate, or filtrate, and the other is the reject stream, or concentrate. |
Reverse osmosis
uses a membrane that is semi-permeable,
allowing the fluid that is being purified to pass through it,
while rejecting the contaminants that remain. Most reverse osmosis
technology uses a process known as crossflow to allow the membrane
to continually clean itself. As some of the fluid passes through
the membrane the rest continues downstream, sweeping the rejected
species away from the membrane, in a concentrated brine reject
water. The process of reverse osmosis requires a driving force to
push the fluid through the membrane, and the most common force is
pressure from a pump. The higher the pressure, the larger the
driving force. As the concentration of the fluid being rejected
increases, the driving force required to continue concentrating
the fluid increases.
Reverse osmosis is capable of rejecting bacteria, salts,
sugars, proteins, particles, dyes, and other constituents that
have a molecular weight of greater than 150-250 daltons. The
separation of ions with reverse osmosis is aided by charged
particles. This means that dissolved ions that carry a charge,
such as salts, are more likely to be rejected by the membrane than
those that are not charged, such as organics. The larger the
charge and the larger the particle, the more likely it will be
rejected.
Reverse Osmosis Rejection Rates
More Details on RO Process
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