Facts
On Reverse Osmosis Water FiltersReverse
osmosis, also known as hyperfiltration, is the finest filtration known. This process
will allow the removal of particles as small as ions from a solution. Reverse
osmosis is used to purify water and remove salts and other impurities in order
to improve the color, taste or properties of the fluid. 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. 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.
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. |