Electromembrane Stacks

The Electromembrane stack is a technology suitable for desalination of brackish water (ElectroDialysis Reversal), carbon capture (CC) and Ammonium removal (Resource Recovery). In the different setups it utilizes ionselective membranes for salt removal (EDR) or  bipolar membranes to split water into hydroxide (OH-) and hydrogen (H+) ions when an electric current is applied. The stack contains alternating cation exchange membranes (CEM) and/or anion exchange membranes (AEM), and bipolar membranes (BPM) arranged between an anode and a cathode. When an electric potential is applied, the CEMs allow cations to pass while blocking anions. The AEMs allow anions to pass while blocking cations. The BPMs split water into OH- and H+ ions. This allows selective transport of ions through the membranes. The cross-flow configuration allows the feed and product streams to flow perpendicular to the membrane surface, which promotes efficient mass transfer. Key applications of the electromembrane stack thus include, desalinaton,  ammonium removal, CO2 removal from flue gas streams or direct air capture (DAC)  systems to obtain pure CO2, and lithium recovery from brines to produce lithium hydroxide. The stack's liquid-tight and closed modular design prevents carryover between compartments and allows high recovery rates at the lowest energy consumption in the market.