1978 Volume 32 Issue 2 Pages 100-103
Sea water was electrodialyzed by a filter-press type electrodialyzer (effective membrane area: 5 dm2), and cation exchange membranes were treated by means of addition of reagent continuously or intermittently into feed sea water.
By the treatment,ε(=Normality of Cl--Ca2+-Mg2+in the concentrate/Normality of Cl-in the concentrate) exceeded 0.99, and permeation of bivalent cations through the membranes was prevented effectively, but at the same time voltage drop per unit cell increased with time. When the treatment was continued,ε attained was apt to decrease, and to increase ε gradually became difficult.
