With the production and application of cutting-edge technology in reverse osmosis membrane technology, it provides comprehensive water treatment solutions for fields such as seawater desalination and wastewater reuse, effectively ensuring the active industrial water requirements for drinking water and domestic water in the Chinese market. How to judge the performance of reverse osmosis membranes during the application process.

The desalination rate directly affects the quality indicators of reverse osmosis membranes:

Below, we will introduce the desalination rate: the percentage of soluble impurity concentration extracted from the inlet water of the ultra pure water machine system through reverse osmosis membrane; Salt penetration rate: The percentage of soluble impurities in the influent that penetrate the membrane;

How to calculate the desalination rate

Desalination rate=(1- Salt content of produced water/Salt content of influent) 100%

How to calculate the desalination rate

Salt penetration rate=100% - desalination rate;

The desalination rate of membrane components is determined during their manufacturing process, and the level of desalination rate depends on the density of the ultra-thin desalination layer on the surface of the membrane components. The lower the density of the desalination layer, the higher the desalination rate, and the lower the water production.

The removal rate of different substances by reverse osmosis is mainly determined by the structure and molecular weight of the substances. The removal rate of high valent ions and complex monovalent ions can exceed 99%. The removal rate of monovalent ions such as sodium ions, potassium ions, and chloride ions is slightly lower, but also exceeds 98%; The removal rate of organic matter with a molecular weight greater than 100 can also reach 98%, but the removal rate of organic matter with a molecular weight less than 100 is relatively low.

Factors affecting the performance of reverse osmosis membranes

The pH value of the inflow has almost no effect on the production of water; And it has a significant impact on the desalination rate. Due to the fact that dissolved CO2 in water exists in the form of gaseous CO2 when the pH value is low, it is easy to penetrate the reverse osmosis membrane. Therefore, the desalination rate is also low when the pH is low. As the pH increases, gaseous CO2 is converted into CO3 and CO32 ions, and the desalination rate gradually increases. Between pH 7.5 and 8.5, the desalination rate reaches a high level.

Osmotic pressure is a function of the concentration of salt powder or organic matter in water. The higher the salt content, the greater the concentration difference, and the increase in salt permeability, leading to a decrease in desalination rate.

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