A reverse osmosis membrane separation equipment is used in water treatment technology, is a natural phenomenon in the penetration of the reverse process (containing salt water in order to overcome the osmotic pressure of the external driving force water molecules through the membrane leaving the reverse osmosis process). Is common in nature, such as a cucumber into the salt water, cucumber water loss will be smaller. Cucumber water molecules into the salt water solution process is the process of penetration. If a water molecule can be only one pool through the film off into two parts, on both sides of the diaphragm and saline were injected into the water to the same height. Over time you can find water surface is reduced, while increasing the surface brine. We move water molecules through the membrane into the salt water penetration phenomenon is called the phenomenon. Increased liquid brine is not endless, at a certain height will reach a balance. Then divide both ends of the surface represented by the poor is called osmotic pressure. The size of the osmotic pressure is directly related to the concentration of salt. In the above device to reach equilibrium, if the salt water side put some pressure on the surface, this time, the water molecules from the salt water side will migrate to the water side. Liquid molecules in dilute solution under pressure from the migration process to the concentrated solution of this phenomenon is called reverse osmosis phenomenon. If you add more salt facilities at one end, and put over the side of the brine osmotic pressure, we can get water at the other end. This is the principle of reverse osmosis water purification. Reverse osmosis water production facilities, the key has two, one is a selective membrane, which we call semi-permeable membrane, the second is a certain pressure. Simply put, reverse osmosis semi-permeable membrane has a large number of holes, these holes the size of the water molecules in size, due to bacteria, viruses, most of the organic pollutants and hydrated ions is much larger than water molecules, it is not through through reverse osmosis semi-permeable membrane with water through a reverse osmosis membrane separation. Many kinds of impurities in the water, the dissolved salts is the most difficult to clear, therefore, often based on the level of desalination rate to determine the effect of reverse osmosis water purification. Osmosis desalination rate is mainly determined by the level of reverse osmosis semi-permeable membrane of selectivity. Currently, the high selectivity of reverse osmosis desalination membrane elements can be as high as 99.7% rate.
A reverse osmosis desalination water treatment process is essentially a physical method, which has a tradition in many water treatment method does not have advantages:
Reverse osmosis is at room temperature, with no phase change of the physical methods for salt water desalination and purification. At present, ultra-thin composite membrane desalination rate of 99.5%, and also removal of colloidal, organic matter, bacteria, viruses, etc.
Water treatment only by water pressure as a driving force, its energy consumption in the lowest number of treatment methods.
Not a lot of chemicals and acids, alkali regeneration process, no chemical waste and waste acid, alkali emissions, no pollution.
Reverse osmosis water system for continuous operation, the system is simple, convenient operation, product water quality and stability.
Operation and maintenance and equipment maintenance workload little.
Equipment, small footprint, small space required.
