What is reverse osmosis? Why is a reverse osmosis water purifier capable of producing direct drinking water?

What is reverse osmosis? Why is a reverse osmosis water purifier capable of producing direct drinking water?

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Reverse osmosis, also known as reverse osmosis, is a membrane separation operation that uses a pressure difference as a driving force to separate a solvent from a solution. Pressure is applied to the liquid on one side of the membrane. When the pressure exceeds its osmotic pressure, the solvent reversely penetrates against the direction of natural permeation. Thus, a permeated solvent, that is, a permeate, is obtained on the low pressure side of the membrane, and a concentrated solution, that is, a concentrate, is obtained on the high pressure side. If seawater is treated by reverse osmosis, fresh water is obtained on the low pressure side of the membrane, and brine is obtained on the high pressure side. The reverse osmosis membrane can trap various inorganic ions, colloidal substances and macromolecular solutes in the water to obtain net water.

The reverse osmosis membrane is the core component for realizing reverse osmosis, and is an artificial semipermeable membrane with certain characteristics made by simulating a biological semipermeable membrane. Generally made of polymer materials. Such as cellulose acetate film, aromatic polyamide film. The size of the permeability is related to the chemical structure of the membrane itself. Some polymer materials have good repellency to salt, and water transmission rate is not good. Some polymer materials have a chemical structure with more hydrophilic groups, so the water transmission rate is relatively faster. Therefore a satisfactory reverse osmosis membrane should have a suitable amount of permeation or desalination.

The reverse osmosis water purifier is a machine that mainly uses the reverse osmosis principle for water treatment.

In the purification process of water, under the action of the osmotic pressure of the solution, these substances and moisture are separated according to the fact that other substances cannot pass through the semipermeable membrane. The membrane pore size of the reverse osmosis membrane is very small, the precision can reach 0.0001 micron, and the diameter of the virus is generally 0.02-0.4 micron. The diameter of ordinary bacteria is 0.4-1 micron, so it can effectively remove bacteria, viruses and dissolve in water. Salts, colloids, microorganisms, organic matter, etc.

The core component of the reverse osmosis water purifier is a reverse osmosis (RO) membrane. In many cases, it is combined with microfiltration, adsorption, ultrafiltration, ultraviolet sterilization and other technologies to purify tap water. The water from the reverse osmosis water purification mechanism is fresher, healthier and safer than the bottled water, and can be directly consumed, so it is also called direct drinking water.

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