The eutectic freezing process separates aqueous solutions of inorganic salts into solid salt and fresh water. It is useful for treating cooling tower and boiler blowdown and the brine effluent from inland desalting plants. By freezing the water out of these aqueous solutions until they are adequately concentrated to precipitate the salt simultaneously, one ends up with no brine product. The ice and salt crystals nucleate and grow independently and are easily separated since the ice floats and the salt sinks. Laboratory investigation of the eutectic temperatures of various proportions of the ions commonly found in natural waters (Na, K, Ca, Mg, Cl, SO4, HCO3) shows that the process will operate well at temperatures no lower than -25°C. © 1979.
Barduhn, A. J., & Manudhane, A. (1979). Temperatures required for eutectic freezing of natural waters. Desalination, 28(3), 233–241. https://doi.org/10.1016/S0011-9164(00)82232-8