What is Reverse Osmosis
Reverse osmosis, also known as Ultra-Filtration by the industry, represents state-of-the-art in water treatment technology. Reverse Osmosis (RO) was developed as a method of desalinating seawater. In reverse osmosis, the idea is to use the membrane to act like an extremely fine filter to create drinkable water from salty (or otherwise contaminated) water. The salty water is put on one side of the membrane and pressure is applied to stop, and then reverse, the osmotic process.
Reverse Osmosis, also known as hyper filtration or ultra filtration, 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 of 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, I is used to produce water that meets the most demanding specifications that are currently in place.
Reverse osmosis uses a spiral membrane that is semi-permeable, allowing the fluid that is being purified to pass through it, while rejecting the contaminants that remain. Spiral membranes span the full spectrum of membrane filtration from micro filtration down to reverse osmosis. Most reverse osmosis technology uses a process knows as cross flow to allow the membrane to continually clean itself. As some of the fluid passes through the membrane the rest continues downstream, sweeping the rejected impurities away from the membrane.
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 particles, the more likely it will be rejected.
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