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REMOVING ARSENIC AND CO-OCCURRING CONTAMINANTS FROM DRINKING WATER BY FULL-SCALE ION EXCHANGE AND POINT-OF-USE/POINT-OF-ENTRY REVERSE OSMOSIS SYSTEMS
Chen, A.S.C., L. Wang, T.J.Sorg, and D.A.Lytle.
Water Research 172:115455(2020)
Two full-scale ion exchange (IX) systems, one point-of-entry (POE) reverse osmosis (RO) system, and nine point-of-use (POU) RO units were installed to evaluate the removal of As and several co-occurring contaminants from drinking water simultaneously. The project was performed as part of the U.S. EPA's Arsenic Treatment Demonstration Program. The IX systems, coupled with strong base anionic (SBA) resins, effectively removed As, NO3-, and U to below MCLs and V and Mo to below 2 µg/L. The useful run length, as determined by either 10 mg/L (as N) NO3- or 10 µg/L As breakthrough, was ~400 bed volumes initially. However, it decreased over time likely caused by resin fouling due to the presence of natural organic matter in source waters. The use of dual resins (an acrylic SBA resin underlain by a polystyrene SBA resin) effectively removed organic matter and allowed the system to perform at its baseline level through 13 months. Arsenic and nitrate peaking occurred when the resins were not regenerated timely. RO effectively removed As, NO3-, Sb, U, and V, mostly with a >99% rejection rate. The POE RO, coupled with dual plumbing and POU RO in individual homes could be used as low-cost alternatives to traditional RO treatment.
Water Research 172:115455(2020)
Two full-scale ion exchange (IX) systems, one point-of-entry (POE) reverse osmosis (RO) system, and nine point-of-use (POU) RO units were installed to evaluate the removal of As and several co-occurring contaminants from drinking water simultaneously. The project was performed as part of the U.S. EPA's Arsenic Treatment Demonstration Program. The IX systems, coupled with strong base anionic (SBA) resins, effectively removed As, NO3-, and U to below MCLs and V and Mo to below 2 µg/L. The useful run length, as determined by either 10 mg/L (as N) NO3- or 10 µg/L As breakthrough, was ~400 bed volumes initially. However, it decreased over time likely caused by resin fouling due to the presence of natural organic matter in source waters. The use of dual resins (an acrylic SBA resin underlain by a polystyrene SBA resin) effectively removed organic matter and allowed the system to perform at its baseline level through 13 months. Arsenic and nitrate peaking occurred when the resins were not regenerated timely. RO effectively removed As, NO3-, Sb, U, and V, mostly with a >99% rejection rate. The POE RO, coupled with dual plumbing and POU RO in individual homes could be used as low-cost alternatives to traditional RO treatment.
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