Factors Affecting Reverse Osmosis Membrane

1. Influence of inlet water pressure on reverse osmosis membrane
Inlet water pressure itself does not affect the amount of salt permeation, but the increase in inlet water pressure increases the net pressure driving reverse osmosis, which increases the water production. At the same time, the amount of salt permeation remains almost unchanged. The increased water production dilutes the salt permeating the membrane, reduces the salt permeability, and increases the desalination rate. When the inlet water pressure exceeds a certain value, due to the excessive recovery rate, the concentration polarization is increased, which will lead to an increase in salt permeation, offsetting the increased water production, so that the desalination rate will no longer increase.
2. Influence of inlet water temperature on reverse osmosis membrane
The conductivity of reverse osmosis membrane water production is very sensitive to changes in inlet water temperature. As the water temperature increases, the water flux also increases linearly. For every 1°C increase in inlet water temperature, the water production increases by 2.5%-3.0%; (based on 25°C)
3. Influence of inlet water pH value on reverse osmosis membrane
The inlet water pH value has almost no effect on the water production, but has a greater impact on the desalination rate. The desalination rate reaches the highest when the pH value is between 7.5 and 8.5.
4. The influence of influent salt concentration on reverse osmosis membrane
Osmotic pressure is a function of the concentration of salt or organic matter in the water. The higher the influent salt content, the greater the concentration difference, the higher the salt permeability, and thus the lower the desalination rate.