Rising global demand for potable water is driving innovation in water treatment methods.
In this letter, we present the first continuous and scalable shock electrodialysis system and demonstrate the separation of sodium, chloride, and similar ions from a feed stream.
The desalination data collapse with dimensionless current, scaled to charge advection in the feed stream. Our prototype continuously removes that we attribute to electroosmotic pumping. Have you heard about something like that before? Shock electrodialysis is a recently proposed technique that exploits deionization shock waves in porous media to purify water. In the presence of chloride ions, oxidation of chloride ions to hypochlorite ions or chlorine gas may take place in addition to oxygen evolution at the anode. For example, while showing its operating key concepts, Figure Diagram of the SED prototype. Data collapse is quite good by scaling an estimate of the transverse ‘electro osmotic’ flow to the applied flow rate, Î = QEO/Q = εζI/, as shown in panel. Figure Desalination performance of the SED prototype. This semilog plot of c̃ versus Ĩ shows excellent data collapse around the redish line, log c̃ = −619Ĩ, especially below 95 salt removal.
Collapse of data of the percentage of ion removal, 1 -c̃, where c̃ = c/c0 is the ratio of fresh to feed salt concentrations, versus dimensionless current, Ĩ = I/, scaled to the rate of positive charge advection into the device. Data for water recovery or dimensionless current Ĩ. The Supporting Information is available free of charge on the ACS Publications website at DOI.