Reverse osmosis membrane technology

2018-12-06 11:51:51

What is reverse osmosis membrane technology?

RO is an abbreviation of Reverse Osmosis,Generally, the flow of water is from a low concentration to a high concentration. Once the water is pressurized, it will flow from a high concentration to a low concentration, which is the so-called reverse osmosis principle: since the pore diameter of the RO membrane is one millionth of the hair filament (0.0001) Micron) is generally invisible to the naked eye. Bacteria and viruses are 5000 times more. Therefore, only water molecules and some mineral ions can pass through (the ions passing through are not detrimental), and other impurities and heavy metals are discharged from the waste pipe. All the processes of seawater desalination and astronaut wastewater recycling are used in this way. Therefore, RO membrane is also called high-tech "artificial kidney" in vitro. At present, at home and abroad, the medical military civilian field has adopted the top RO membrane for polymer filtration.

Reverse osmosis is a new membrane separation technology developed in the 1960s. It relies on a reverse osmosis membrane to separate the solvent and solute in solution under pressure. Reverse osmosis technology is a membrane separation filtration technology that uses osmotic pressure difference as power. It originated from the research of aerospace science and technology in the 1960s in the United States, and then gradually transformed into civilian use. It has been widely used in scientific research, medicine, food, beverage, and sea water. Desalination and other fields.

The reverse osmosis membrane has a pore size as small as nanometer (1 nm = 10*-9 m). Under a certain pressure, water molecules can pass through the RO membrane, and inorganic salts, heavy metal ions, organic matter, colloids, bacteria, viruses, etc. in the source water. Impurities cannot pass through the RO membrane, so that the permeable pure water and the impervious concentrated water are strictly distinguished. Reverse osmosis reduces the total dissolved solids of the treated water. This is a feature not found in other water treatment principles. Reverse osmosis water is the cleanest in current water treatment.

About 0.1 nanometer itself is a boring problem to be solved. In the eyes of the user, this is just a number and it doesn't mean anything. And a number can't tell us exactly what it can do. We certainly want to invite other guests---the main water Contaminant ions. The main pollutants known at present are divalent mercury ions, divalent lead ions, divalent copper ions, trivalent arsenic ions, etc. The smallest of these ions is trivalent arsenic ion, which has a diameter of 0.116 nm and cannot pass RO. Reverse osmosis membrane.

The diameter of viruses, bacteria, and organic pollutants that we care more about is much larger than that of ions. In the case of viruses, the diameter range is roughly 0.02-0.4 microns. It is even more impossible to pass the RO reverse osmosis membrane. After an intuitive introduction, everyone has a new understanding of 0.1 nm. In short, such ultra-high filtration precision allows only water molecules to pass through. This is also the mystery of the water filtered by the RO water purifier.

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