Abstract: An electrodialysis desalination process for seawater comprising the steps of collecting seawater and heating same by solar heat; subjecting seawater thus heated to electrodialysis; and separating same into two portions of a diluted solution and a concentrated brine, is provided, as well as the same system comprising a preheater utilizing solar heat for preheating seawater, an electrodialyser for separating seawater thus preheated by said preheater into said two portions, and means for supplying seawater to the preheater and then from the preheater to the electrodialyser. Various modifications of the above process and system are disclosed. According to the present inventions, electric power consumption in the electrodialysis is saved and solar heat is utilized effectively.

Abstract: An electrodialysis desalination process for seawater comprising the steps of collecting seawater and heating same by solar heat; subjecting seawater thus heated to electrodialysis; and separating same into two portions of a diluted solution and a concentrated brine, is provided, as well as the same system comprising a preheater utilizing solar heat for preheating seawater, an electrodialyser for separating seawater thus preheated by said preheater into said two portions, and means for supplying seawater to the preheater and then from the preheater to the electrodialyser. Various modifications of the above process and system are disclosed. According to the present inventions, electric power consumption in the electrodialysis is saved and solar heat is utilized effectively.