Why should antiscalants be added to reverse osmosis systems?

In order to prevent the formation of compounds insoluble in water, it is necessary to add acid or scale inhibitor to the feed water of reverse osmosis. The scale inhibitor makes a small amount of scale inhibitor adsorb to the surface of the microcrystal through the “threshold effect” during use. In this way, the growth and deposition of microcrystals can be prevented, and the formation of “scale” on the reverse osmosis membrane can also be prevented by dispersing ions insoluble in water.

In the reverse osmosis system, the water supply system is divided into two paths after entering the reverse osmosis system, one of which passes through the surface of the reverse osmosis membrane and becomes the product water, and the other path moves in parallel along the surface of the reverse osmosis membrane and gradually concentrates. A large amount of salt, and even organic matter, colloids, microorganisms, bacteria, viruses, etc. Among these concentrated salts, there are not only ions that are easily soluble in water, such as potassium ions, sodium ions, chloride ions, nitrate ions, etc., but also many ions that form compounds that are insoluble in water, such as calcium ions and bicarbonate. Radical ions form calcium carbonate, and sulfate ions form calcium sulfate. In addition, magnesium ions, barium ions, strontium ions, and silicates all have the problem of forming water-insoluble compounds with related ions after concentration. In order to prevent the formation of compounds insoluble in water, it is necessary to add acid or scale inhibitor to the feed water of reverse osmosis. The scale inhibitor makes a small amount of scale inhibitor adsorb to the surface of the microcrystal through the “threshold effect” during use. In this way, the growth and deposition of microcrystals can be prevented, and the formation of “scale” on the reverse osmosis membrane can also be prevented by dispersing ions insoluble in water. The most commonly used scale inhibitor in the past was sodium hexametaphosphate, but due to its own inherent shortcomings, it has not been used much at present, and more and more users have adopted the scale inhibitor produced by specialized manufacturers.

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Further reading:

Industrial Water Purification System Machine RO

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