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e., [Ba2+] less then 10 mg/L and [Ra2+] less then 50 pCi/L). Seeding the reactor with barium sulfate enhanced Ba2+ and Ra2+ removal through induced heterogeneous precipitation of barite. However, it was necessary to simultaneously adjust the Sr/Ba ratio and barite level to achieve treatment requirements while maintaining reasonable detention time in the reactor (i.e., less then 30 min) and minimizing sludge production. Experimental and modeling results revealed that low Ba2+ and Ra2+ effluent concentrations, with minimized sludge productio