Osmosis is common in nature, such as putting a cucumber in salt, the cucumber will become smaller due to water loss. The process by which the water molecules in the cucumber enter the brine solution is the osmosis process. If a pool is divided into two parts by a membrane that only water molecules can penetrate, pure water and salt water are injected to the same height on both sides of the membrane. After a period of time, it can be found that the level of pure water decreases, while the level of salt water increases. We call the phenomenon of water molecules migrating into the brine through this membrane as osmosis. The rise of the salt water level is not endless, and it will reach an equilibrium point at a certain height. At this time, the pressure represented by the liquid level difference at both ends of the diaphragm is called osmotic pressure.
ro membrane technology is the most advanced and energy efficient membrane separation technology available today. The principle of ro membrane technology is that under the action of higher than the osmotic pressure of the solution, these substances and water are separated according to the fact that other substances cannot pass through the semi-permeable membrane. Because the reverse osmosis membrane has a very small pore size (only about 10A), it can effectively remove dissolved salts, colloids, microorganisms, organic matter, etc. in water (the removal rate is as high as 97 to 98%). The hi tech reverse osmosis system has the advantages of good water quality, low energy consumption, no pollution, simple process and easy operation.
The system salt removal rate of reverse osmosis equipment is generally 98 to 99%, and this salt removal rate can meet the requirements in most cases. Equipment with ro membrane technology may have higher requirements for pure water in the electronics industry, ultra-high pressure boiler make-up water, and individual pharmaceutical industries. At this time, the single-stage reverse osmosis equipment cannot meet the requirements.
ro membrane technology is usually used for fresh water of seawater and brackish water; softening treatment of water; wastewater treatment and purification, concentration and separation of food, pharmaceutical industry, and chemical industry. In addition, the application of ro membrane technology to pre-salting treatment has also achieved good results, which can reduce the load of ion exchange resin by more than 90%, and the amount of resin regeneration agent can also be reduced by 90%. Therefore, the ro membrane technology not only saves costs, but also is conducive to environmental protection. ro membrane technology can also be used to remove particles, organic substances and colloids in water, which has a good effect on reducing the pollution of ion exchange resin and prolonging the service life.