AWWA ACE63188

Purolite A-850 polyacrylic resin was chosen for this test, a run length of 255 bed volumes was selected. Counter-current regeneration of the exhausted resin using a 6 percent NaCl solution was performed. Complete removal of nitrate (NO₃^-, sulfate (SO₄^-, bicarbonate (HCO₃^-) and perchlorate (ClO₄^-) was achieved in 13 BV. Based on this, a partial regeneration of 21 lbs/ft³ was selected for the resin during baseline testing. The biological brine treatment system was housed in a sequencing batch reactor (SBR) and demonstrated that the process was able to consistently reduce perchlorate and nitrate concentrations in the spent brine (6 percent NaCl) to below treatment goals (ClO₄^- < 100 µg/L and NO₃^- < 0.5 mg/L) for 20 (re)cycles. Results for 20 cycles of exhaustion and regeneration of resin using treated brine showed that the IX process could successfully remove perchlorate and nitrate. Includes 20 references, tables, figures.