What are the reasons for the decrease in desalination efficiency of industrial deionized water systems?

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　　I believe some people have doubts about why we need to desalt water. For example, it removes salts such as calcium and magnesium ions, silicates, and sulfates, just like boiler water does; calcium and magnesium ions are removed to prevent their formation in the boiler during the evaporation process. A scale installed on the boiler’s steel plate or steel pipes prevents heat transfer from the boiler and damage to the steel plates. In the case of iron and salts in a boiler, it will form a primary battery and undergo a chemical reaction. Meanwhile, the desalination rate of ultrapure water equipment has a certain impact on the water quality of subsequent ultrapure water equipment. The editor has analyzed for you the reasons behind the decline in the desalination efficiency of ultra-pure water equipment. The following content will be helpful to you. 　　Regarding the factors that affect the desalination efficiency of ultra-pure water equipment, in simple terms, if the operation is normal, the water pressure of the ultra-pure water equipment does not impact its desalination efficiency; however, when the T value represents the pressure level, the water pressure still does not affect the desalination efficiency of the ultra-pure water equipment. Under normal conditions, the ultra-pure water equipment will exceed the standard values due to its high recovery rate. Increased concentration polarization leads to excessive salt penetration in ultra-pure water equipment, ultimately resulting in a reduced desalination efficiency of such equipment. Generally, there is an allowable pH range for all water purification devices; although pH does not affect the water production volume of ultra-pure water equipment, it does influence its desalination efficiency. When the pH is low, CO2 exists in gaseous form; therefore, the desalination rate at low pH is also low. When the pH value is between 7.5 and 8.5, the desalination rate reaches a relatively high level. Of course, temperature also has a certain impact on the desalination efficiency of ultra-pure water equipment. Why is the impact on operating pressure, desalination rate, and reverse osmosis pressure drop relatively significant? Therefore, the water temperature of the ultra-pure water equipment should be kept within a reasonable range. Finally, it is noted that when ultra-pure water equipment is used to treat raw water, the salt concentration in the incoming water also has an impact on the desalination efficiency of such equipment; the higher the salt content, the greater the concentration difference. Increase the salt penetration rate. Therefore, the desalination rate was reduced.