Abstract
The influence of various types of complex in plating baths (salt of cyanogen complex, amine, organic salt and organic polyphosphatase, etc.) on the transitivity of polysulfonamide and cellulose acetate reverse osmosis membranes was studied. The results show that the presence of a complex in the plating bath causes the osmotic pressure of the solution, and consequently the water flux of the membrane to change. Because the stability, concentration and volume of complex ions are different for various types of complex, the transitivity of the membrane also differs. The greater the stability, volume and concentration of complex ions and the more different kinds of complex ions present in the plating bath, the lower the conductimetric rejection and water flux. It is difficult to treat such rinse water using only reverse osmosis technology; for effective treatment, reverse osmosis needs to be combined with some other process. Only when the reduction in transitivity is small may rinse water be treated by reverse osmosis alone.
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