Electrodialysis For Waste Water

Electrodialysis Reversal (EDR) is an electrochemical separation process that allows selective passage of ions, or charged species, in solutions. Only anions, or negatively charged ions, can pass through an anion exchange membrane while cation exchange membranes transport positively charged ions or cations. Ions are transferred through ion exchange membranes by means of direct current (DC) voltage and are removed from the feed water as the current drives the ions through the membranes to desalinate the process stream. EDR systems reduce the fouling tendencies of the water by reversing the polarity of the electrodes every 15 to 20 minutes. This change in polarity causes the scale to disassociate from the membranes. Membranes can operate on waters with up to 0.5 ppm chlorine, making systems tolerant to disinfection.

Electrodialysis Reversal (EDR) is an electrochemical separation process that allows selective passage of ions, or charged specie