Strong base anion resin (SBA), operated in the chloride form, can remove many contaminants from drinking water. These contaminants include arsenic V (also known as arsenate), nitrate, chromate, fluoride and uranium. The two types of SBA exchange resin commonly used today are Type 1 and Type 2 SBA exchange resins. Both resins can be used to remove the contaminants listed above.
The Type 1 derives its ion exchange capabilities from the trimethylamine (TMA) functional group. The Type 2 derives its functionality from the dimethylethanolamine (DMEA) group. The TMA in Type 1 has the potential to contribute fishy odor to the treated water under alkaline conditions. The Type 2 do not have the potential to contribute odors to the water and because of this are preferred in many drinking water applications.
The relative order of affinity of these SBA resins for some common ions in drinking water is: Uranium/Perchlorate> Sulfate/Chromium > Arsenate> Nitrate> Chloride> Bicarbonate> Fluoride.
The strong base anion resin is typically regenerated with dilute brine, about five to 10 percent strength, usually at 10 to 15 pounds per cubic foot.