Abstract
With sodium hypochlorite reverse osmosis separation under a pressure of 1.0 MPa, deterioration of asymmetric cellulose acetate R.O. membranes (initial acetyl content 39.8%) was accelerated at higher temperature and at higher concentration. The deteriorated membranes have the symptoms of reduction in separation and increase in pure water permeability. Change of chemical composition of membrane material was not observed as a whole, but occurred in the active surface layer. No structural change in the layer was observed, at the scale of the scanning electron microscope.
