Abstract
Concentration polarization effect has been investigated for a batch type reverse osmosis cell with the membranes prepared in 3% NaCl solution at various annealing temperatures. It was found that this effect became stronger for a higher water flux membrane. Effects of salt-gelation on the reverse osmosis properties of cellulose acetate membrane have been investigated also. The membrane shrinkage increased with salt concentration of gelation medium. Correspondingly the salt rejection increased but the water flux decreased. The salt-gelation effect was in accord with the order in the lyotropic series. No evidence of asymmetric character of the reverse osmosis has been observed for the salt-gelled membrane.
