Positively charged (cetylpyridinium chloride), negatively (sodium dodecyl sulfate), and non-charged (polyethylene glycol) surfactants are used as potential foulant in reverse electrodialysis systems supplying seawater river freshwater. Fouling tendency of the foulants to ion-exchange membranes is investigated terms adsorption by electromigration, electrostatic attraction, macromolecule interact...