Exergy’s PurOxys™ is a state-of-the-art technology that uses ion exchange membranes to purify and recycle used or spent industrial acids. The membranes are installed in single or multiple stacks that are supported in a plate and frame structure. Exergy’s patent pending “one-piece” membrane spacers creates compartments with appropriate cell distances for optimum diffusion. Counter-current streams of spent acid and deionized water alternate through the cells. Free acid is transported from the spent acid stream into the deionized water stream. This stream (diffusate) is recovered acid for reuse in the process. The metals in the feed spent acid are rejected, and are carried as the dialysate, creating a waste stream for metal recovery or treatment.