What Are The Factors Affecting Reverse Osmosis Membrane

Release time:

2023-01-31

1. Effect of inlet pressure on reverse osmosis membrane

The influent pressure itself does not affect the excessive salt penetration, but the increase of influent pressure increases the net pressure driving reverse osmosis, which increases the water yield. At the same time, the excessive salt penetration is almost unchanged. The increased water yield dilutes the salt through the membrane, reduces the salt penetration rate and improves the desalination rate. When the inlet water pressure exceeds a certain value, due to the high recovery rate, the concentration polarization is increased, which will lead to the excessive increase of salt permeability, offset the increased water production, and make the desalination rate no longer increase.

2. Effect of inlet water temperature on reverse osmosis membrane

The conductivity of reverse osmosis membrane water production is very sensitive to the change of inlet water temperature. With the increase of water temperature, the water flux also increases linearly. For every 1 ℃ increase of inlet water temperature, the water production will increase by 2.5% - 3.0%; (based on 25 ℃)

3. Influence of influent pH value on reverse osmosis membrane

Influent pH value has little effect on water yield, but has a great effect on desalination rate. The pH value is between 7.5-8.5, and the desalination rate reaches the highest.

4. Effect of influent salt concentration on reverse osmosis membrane

Osmotic pressure is a function of the concentration of salt or organic matter in water. The higher the salt content of influent, the greater the concentration difference, and the salt permeability increases, resulting in the decrease of desalination rate.