Hydraulic permeation of NaCl solution through sulfonated polysulfone-polyvinyl alcohol polysulfone composite reverse osmosis membrane

The hydraulic permeation of NaCl solution through sulfonated polysulfone-polyvinyl alcohol/polysulfone composite reverse osmosis membrane was systematically investigated. It was found that the transport of water in a sulfonated polysulfone-polyvinyl alcohol/polysulfone composite reverse osmosis membrane follows the modified solution diffusion equation developed by Yang and Chu. Moreover, the equation between salt rejection and applied pressure was proposed for describing the hydraulic permeation of salt solution through a sulfonated polysulfone-polyvinyl alcohol/polysulfone composite membrane. The salt rejection was found to fit the greater part of separation transport mechanism. The experimental data and the salt rejection equation appear to be in excellent agreement.