Does pH have an impact on desalination and lifespan of reverse osmosis membranes?

As the main filtration process in water treatment equipment, reverse osmosis equipment determines whether the pH value of the raw water entering the reverse osmosis membrane will cause damage to the membrane. Generally speaking, composite membrane materials are commonly used for reverse osmosis membranes. If the pH value is within the specified range of 2-11, the damage and impact of pH value on the membrane itself will be minimal.

As for the influence of pH on the desalination rate of reverse osmosis membranes, it is determined by the characteristics of various ions in water that are affected by pH value. This is due to the acidity, decomposability, and degree of charge of the ions themselves, which are all factors that can lead to a decrease in the desalination rate of the membrane.

It can be seen that pH still has a significant impact on the desalination rate of certain impurities. Similarly, if the removal rate of CO2 by the reverse osmosis membrane is zero and the pH value of the raw water is increased to convert CO2 into CO32-, the reverse osmosis membrane can effectively desalinate. But at this time, special attention should be paid to the scaling problem of the reverse osmosis membrane.