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AWWA ACE63188
- Optimization of Biological Treatment of Perchlorate and Nitrate-Laden Ion Exchange Residuals
- Conference Proceeding by American Water Works Association, 06/01/2006
- Publisher: AWWA
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Purolite A-850 polyacrylic resin was chosen for this test, a run length of 255 bed volumes wasselected. Counter-current regeneration of the exhausted resin using a 6 percent NaCl solutionwas performed. Complete removal of nitrate (NO<sub>3</sub><sup>-</sup>, sulfate (SO<sub>4</sub><sup>-</sup>, bicarbonate(HCO<sub>3</sub><sup>-</sup>) and perchlorate (ClO<sub>4</sub><sup>-</sup>) was achieved in 13 BV. Based on this, a partial regeneration of21 lbs/ft<sup>3</sup> was selected for the resin during baseline testing. The biological brine treatmentsystem was housed in a sequencing batch reactor (SBR) and demonstrated that the process wasable to consistently reduce perchlorate and nitrate concentrations in the spent brine (6 percentNaCl) to below treatment goals (ClO<sub>4</sub><sup>-</sup> < 100 µg/L and NO<sub>3</sub><sup>-</sup> < 0.5 mg/L) for 20 (re)cycles.Results for 20 cycles of exhaustion and regeneration of resin using treated brine showed that theIX process could successfully remove perchlorate and nitrate. Includes 20 references, tables, figures.
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