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Removal of Selenate from Water by Zerovalent Iron

Department of Environmental Sciences, University of California, Riverside, CA 92521-0424

View larger version (32K): [in a new window]   Fig. 1. Stability of Se species in a 0.35 M PO3–4 solution containing zerovalent iron (ZVI) and iron oxyhydroxides (FeOH) for 2- (left figures) and 5-h reactions (right figures). The pH range of PO3–4 solution was 7 to 12.6. Error bars show one standard deviation (n = 3).

View larger version (34K): [in a new window]   Fig. 2. Removal of Se(VI) in 10 mM Cl– (left figures) and SO2–4 (right figures) solutions by zerovalent iron (ZVI) under a closed condition. (A) Changes in pH and Eh during the removal of Se(VI). (B) Removal of Se(VI) in the solutions. (C) Selenium species in the ZVI and iron oxyhydroxides (FeOH) extracted by a 0.35 M PO3–4 solution (pH 12.6). Error bars show one standard deviation (n = 3).

View larger version (35K): [in a new window]   Fig. 3. Removal of Se(VI) in 10 mM Cl– (left figures) and SO2–4 (right figures) solutions by zerovalent iron (ZVI) under an open condition. (A) Changes in pH and Eh during the removal of Se(VI). (B) Removal of Se(VI) in the solutions. (C) Selenium species in the ZVI and iron oxyhydroxides (FeOH) extracted by a 0.35 M PO3–4 solution (pH 12.6). Error bars show one standard deviation (n = 3).

View larger version (28K): [in a new window]   Fig. 4. Effect of Cl– and SO2–4 concentrations on the removal of Se(VI) by zerovalent iron (ZVI). Error bars show one standard deviation (n = 3). Inserted small figures show the first-order kinetics of Se(VI) removal.

View larger version (24K): [in a new window]   Fig. 5. Effect of HCO–3, PO3–4, and NO–3 concentrations on the removal of Se(VI) by zerovalent iron (ZVI). Error bars show one standard deviation (n = 3). Inserted small figures show the first-order kinetics of Se(VI) removal.