Study on Salinity Gradient Power Generation by Reverse Electrodialysis

The usage of reverse osmosis drainage for power generation was investigated by reverse electrodialysis method.System experiments were carried out to study the effects of many factors on the power density of reverse electrodilaysis power device, including the concentration ratio and the flow directions of the concentrated solution and the dilute solution, the type of ionexchange membrane, RO concentrated solution and simulated seawater as concentration solution. The experiment results indicated that the power density increased with the increasing concentration ratio of the solutions; the ion exchange membrane with low surface resistance and high permeability selectivity had high power density; power density resulting from the co-current was higher than that of counter-current; the multivalent ions in RO concentrated seawater had a certain influence on the power density.