Selenate removal by Fe coupled with ferrous iron, hydrogen peroxide, sulfidation, and weak magnetic field: A comparative study.

Author(s) Fan, P.; Li, L.; Sun, Y.; Qiao, J.; Xu, C.; Guan, X.
Journal Water Res
Date Published 2019 Aug 01
Abstract

Dosing ferrous ions (ZVI/Fe), combining with oxidants (e.g., HO) (ZVI/HO), sulfidation treatment (S-ZVI), and introducing a weak magnetic field (ZVI/WMF) have been widely used to enhance the performance of zerovalent iron (ZVI) for reductive removal of contaminants. Taking Se(VI) as a probe contaminant, this study systematically compared the performances of different ZVI systems (i.e., ZVI/Fe, ZVI/HO, S-ZVI, and ZVI/WMF) for contaminant removal. All the four tested methods could greatly improve the performance of ZVI for Se(VI) removal. Se(VI) was removed by S-ZVI at S/Fe molar ratio of 0.05 with a much greater rate constant than other enhanced-ZVI technologies while the maximum amount of Se(VI) removal was obtained in ZVI/Fe system with Fe applied at 0.5 mM among the four tested enhanced-ZVI technologies at initial pH 6.0. In addition, Se(VI) removal by ZVI/Fe was least influenced by initial pH compared to the other tested enhanced-ZVI systems, implying its good adaptability of pH. The application of these tested methods could significantly increase the electron efficiency from ∼0.5% to 4.06-8.72% and Fe application was much more efficient in enhancing the electron efficiency than the other three methods. Finally, the perspective of these enhanced-ZVI technologies was compared in terms of their reactivity, selectivity, chemical cost, and pH adaptability and some suggestions for their possible application were provided.

DOI 10.1016/j.watres.2019.05.037
ISSN 1879-2448
Citation Fan P, Li L, Sun Y, Qiao J, Xu C, Guan X. Selenate removal by Fe coupled with ferrous iron, hydrogen peroxide, sulfidation, and weak magnetic field: A comparative study. Water Res. 2019;159:375-384.

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