1. The influence of inlet water pressure on reverse osmosis membrane
The inlet water pressure itself does not affect the salt permeation rate, but the increase in the inlet water pressure increases the net pressure that drives the reverse osmosis, which increases the water production, while the salt permeation is almost unchanged, and the increased water production dilutes the permeation The salt content of the membrane reduces the salt permeability and increases the salt rejection rate. When the inlet water pressure exceeds a certain value, due to the excessively high recovery rate, the concentration polarization is increased, which will lead to an increase in salt permeation, which offsets the increased water production and makes the desalination rate no longer increase.
2. The influence of inlet water temperature on reverse osmosis membrane
The water conductivity of the reverse osmosis membrane is very sensitive to the change of the inlet water temperature. With the increase of the water temperature, the water flux also increases linearly. When the inlet water temperature increases by 1℃, the water production increases by 2.5%-3.0%; 25℃ is the standard)
3. The influence of the pH value of the inlet water on the reverse osmosis membrane
The pH value of the influent water has almost no effect on the water production, but has a greater effect on the salt rejection rate. The PH value is between 7.5-8.5, and the salt rejection rate reaches the highest.
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 salt content of the influent, the greater the concentration difference, and the increase in salt permeability, which leads to a decrease in the salt rejection rate.
