By Sergio Ferreira / Published on Fri, 2007-09-21 13:24
A second membrane method is based on reverse dialysis. It requires two types of membranes, namely one that is selectively permeable for positive ions and one that is selectively permeable for negative ions, see figure 2. Salt water separated from fresh water between two such membranes will lose both positive ions and negative ions. This charge separation produces a potential difference that can be utilized directly as electrical energy.
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