Presentation describes a electrodialysis (ED) method, sometimes called electrodialysis metathesis (EDM), for reducing concentrate/brine discharge from reverse osmosis (RO) desalination water treatment plants....

The presence of calcium sulfate in groundwater limits the degree to which water can be recovered by reverse osmosis. The ZDD (Zero Discharge Desalination) technology removes calcium sulfate as a solid that has potential commercial value. In the ZDD process, RO concentrate is treated by an electrodialysis (ED) process called EDM (electrodialysis met...

Zero discharge desalination (ZDD) update from the University of Texas, El Paso. Explanation of electro dialysis (ED) vs. electro dialysis metathesis (EDM). EDM is the heart of the ZDD process in dealing with difficult Tularosa Basin (New Mexico) ground water that contains gypsum CaSO4....