Loprest offers systems for chromium removal using many of the available technologies that have been shown to be effective. I on exchange using either weak base anion resin (WBA) or strong base anion resin (SBA) can be used. With SBA the resin is used in the salt form and can be regenerated with salt producing a brine waste requiring disposal. Using the WBA anion approach, the resin is not regenerated and requires pH adjustment to a range of 5-6 up front to optimize the removal process.
Another process know as RCF (Reducton/Coagulation/Filtration) uses ferrous sulfate to first reduce the hexavalent chrome to trivalent chrome, then enhance coagulation with ferric iron prior to filtration with a dual media filter. Sulfur modified iron (SMI) can be used in an adsorbant column to effectively remove chromium through a reduction mechanism. The selection of each of these technologies for a given project is heavily dependent on the chemical make up of the feedwater stream and the co-contaminants present in addition to the site specific waste handling limitations. Loprest systems are manufactured to the highest quality and meet local state and federal design requirements including, ASME, EPA, NSF61, DEQ, DOW and Ten State Standards.