System and Method for Reversible Cation-exchange Desalination
Desalination is accomplished by subjecting feed saline water to a cation exchanger in magnesium form where sodium and scale-forming cations are at least partially exchanged for non-scale-forming magnesium ions. This ion exchange also reduces the osmotic pressure of the solution. When the resultant solution is subjected to a pressure-driven membrane desalination process, scaling is reduced and desalinated water is efficiently produced at a lower pressure. After desalination, the concentrated waste water, which contains higher concentrations of ions such as magnesium and sodium, is used to regenerate the depleted cation exchanger back into magnesium form. This regeneration permits the process to be self-sustainable.
SENGUPTA ARUP K [US]; SARKAR SUDIPTA [US]
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