Shock electrodialysis (or shock ED) is an emerging technology for water purification and separations based on splitting fluid streams on either side of a deionization shock wave propagating through a charged porous medium at overlimiting current. This talk will introduce the basic physics and design principles of shock ED and will demonstrate possible applications in water remediation. When the feed is dilute, shock ED can be used for deionization (&gt;99%) with high (85%) water recovery, which we demonstrated by removing ions of cobalt and cesium from model radioactive water as well as lead from simulated drinking water. We also observed high (&gt;90x) selectivity for multivalent ions relative to monovalent ions and mathematically modeled this phenomenon to understand its underlying mechanisms. Selectivity toward toxic heavy metals (which are often multivalent) at low salinity guarantees an ultra-low cost of electrical energy (~$0.01/m<sup>3</sup> feed), which enables practical solutions to purify drinking water from corroded pipes or contaminated sources. In addition to ionic separations, this talk will explore exotic separations such as removal of biological contaminants and nanoparticles.

Shock electrodialysis for low-cost continuous removal of toxic contaminants from water

ACS Spring 2022

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