Shri Ujjwal Kanti Bhattacharya, Director(Projects) inaugurated ‘24 TPD Electro-Dialysis Reversal (EDR) Plant’ at NETRA which has been developed jointly with CSIR-CSMCRI, Bhavnagar.

Electrodialysis (ED) is an electro-membrane separation process and is based on electrically charged membranes - where potential difference is applied to separate ionic species from aqueous solution and other uncharged components. This separation is achieved inside an EDR stack equipped with ion selective membranes, placed between two electrodes. Unidirectional-operated electrodialysis plants are sensitive to membrane fouling and scaling. This issue can be completely avoided by reversing the polarity of electrodes at specific time intervals. Therefore, this process is called ‘Electro-Dialysis Reversal’.

The aforesaid EDR plant generates low TDS permeate (<300 ppm) from high TDS feed water (2,000-3,000 ppm) with high yield (>75%) and low sp power consumption (~1.5 kWh/M3).