(596f) Novel Electrodialysis Metathesis (EDM) Relationship to Electrodialysis (ED) for Desalination and Recovery of Minerals from Impaired Water

Electrodialysis Metathesis (EDM) is a novel modification of the ED process consisting of quads as the repeating unit cell and uses the technique that applies double decomposition reaction for the interchange of cations and anions between the feed and a sacrificing solution. EDM has the potential to increase the desalination efficiency of reverse osmosis. It is also a promising technology to treat concentrate with scale formers like CaSO₄ and CaCO₃ that can further recovered as secondary products with marketable value. In doing this, augmenting water and reducing disposal cost can be possible through EDM technology.  Current voltage relationship determines the resistance behavior in ED, however there is still knowledge gap to understand the current voltage relation in EDM. In this research we determined the current voltage relationship for the EDM process as a function of increasing number of quads, varying feed concentrations for a given superficial flow velocity as well as batch and continuous mode. We found that current density is directly related to the number of cell pairs and quads for ED and EDM, respectively, and the resistance increased with increasing cell pairs/quads. This current - voltage relationship study would help to provide the range of voltage for optimum energy usage in the EDM process.