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Publikationstyp
Wissenschaftlicher Artikel
Erscheinungsjahr
2023
The fate of selenium in a pilot plant for biological iron and manganese removal
The fate of selenium in a pilot plant for biological iron and manganese removal
Herausgeber
Quelle
Water
15 (2023), Heft 17
15 (2023), Heft 17
Schlagwörter
Zitation
DIPPON-DEISSLER, Urs, Daniel MAHRINGER, Aki Sebastian RUHL und Andrea STEUER, 2023. The fate of selenium in a pilot plant for biological iron and manganese removal. Water [online]. 2023. Bd. 15 (2023), Heft 17. DOI 10.60810/openumwelt-1117. Verfügbar unter: https://openumwelt.de/handle/123456789/1687
Zusammenfassung englisch
Selenium (Se) is essential to human health, yet harmful in high doses. Of the water-soluble Se redox species, Se(IV) readily adsorbs onto iron and aluminium oxides. Se(VI), the dominant form in oxygenated waters, is more mobile and less readily adsorbed. In this study, the removal of Se(VI) by reduction with Fe(II) to Se(IV) and subsequent adsorption onto iron hydroxides is investigated in a pilot plant for biological iron and manganese removal from groundwater to investigate an economical approach for Se removal during drinking water production. While Se(IV) is removed by up to 90%, Se(VI) shows no removal over 48 h. In batch-shaking tests, the adsorption of Se(IV) and Se(VI) onto iron hydroxides with and without addition of Fe(II) or dithionite as reducing agents was studied. Se(IV) was removed to a greater extent by adsorption than Se(VI) (7% and 2.6%, respectively, at a starting concentration of 0.1 mg/L) and the addition of reducing agents resulted in no significantly higher removal of Se(VI). Reducing Se(VI) with Fe(II) or dithionite and consequent adsorption onto iron hydroxides can therefore be excluded as viable removal mechanism for Se(VI). © 2023 by the authors