Spiral wound EDI technology part 1


Courtesy of Agape Water Solutions, Inc.

Water purification by reducing the concentration of ionic impurities has been an area of considerable technical interest. Water treatment technologies have rapidly advanced in recent years to where a myriad of options have been developed for this purpose. The most well-known processes include electrodialysis, electrodeionization (EDI), liquid chromatography, membrane filtration, and ion exchange. Producing pure water without regeneration chemicals is now a practical reality. EDI is a separation process combining electrodialysis and conventional ion exchange (IX); the resulting hybrid process does not entail regenerant chemicals. EDI technology has been reported in the literature since 1950s (1, 2).

The first patent for EDI was granted to a Dutch company in 1957 (3). A patent for the purification of acetone with EDI was also granted to Kollsman (2) in 1957. For fundamentally the same reasons that reverse osmosis (RO) system are cost-effectively replacing cation and anion units, EDI systems can also supplant mixed-bed deionizers (4). The EDI process is preferred in many systems primarily because of the environmental benefit of no required hazardous regenerant chemicals and the inherent superiority of a continuous process over a batch process (5).

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