As removal using ion exchange WITH SPENT BRINE RECYCLING

A conventional sulfate‐selective Type‐2 polystyrene strong base anion resin was studied for arsenic (As) removal from Albuquerque, N.M., drinking water. Attention was focused on the regeneration aspects of ion exchange and the potential for reusing the spent brine directly without removing As. The major finding was that As‐laden spent brine with makeup salt addition to 1 M chloride could be reused up to 20 times with no effect on As leakage and minimal effect on run length. The authors also found that As could be removed from the spent recycle brine using ferric hydroxide coagulation in such a way that the resulting sludge passed the toxicity characteristic leaching procedure test as a nonhazardous waste.