Details zur Publikation |
| Kategorie | Textpublikation |
| Referenztyp | Zeitschriften |
| DOI | 10.1021/es201522n |
| Titel (primär) | Biogenic Fe(III) minerals lower the efficiency of iron-mineral-based commercial filter systems for arsenic removal |
| Autor | Kleinert, S.; Muehe, E.M.; Posth, N.; Dippon, U.; Daus, B.; Kappler, A. |
| Quelle | Environmental Science & Technology |
| Erscheinungsjahr | 2011 |
| Department | ANA |
| Band/Volume | 45 |
| Heft | 17 |
| Seite von | 7533 |
| Seite bis | 7541 |
| Sprache | englisch |
| Abstract | Millions of people worldwide are affected by As (arsenic) contaminated
groundwater. Fe(III) (oxy)hydroxides sorb As efficiently and are
therefore used in water purification filters. Commercial filters
containing abiogenic Fe(III) (oxy)hydroxides (GEH) showed varying As
removal, and it was unclear whether Fe(II)-oxidizing bacteria influenced
filter efficiency. We found up to 107 Fe(II)-oxidizing
bacteria/g dry-weight in GEH-filters and determined the performance of
filter material in the presence and absence of Fe(II)-oxidizing
bacteria. GEH-material sorbed 1.7 mmol As(V)/g Fe and was  8 times more efficient than biogenic Fe(III) minerals that sorbed only 208.3 μmol As(V)/g Fe. This was also 5
times more efficient than a 10:1-mixture of GEH-material and biogenic
Fe(III) minerals that bound 322.6 μmol As(V)/g Fe. Coprecipitation of
As(V) with biogenic Fe(III) minerals removed 343.0 μmol As(V)/g Fe,
while As removal by coprecipitation with biogenic minerals in the
presence of GEH-material was slightly less efficient as GEH-material
only and yielded 1.5 mmol As(V)/g Fe. The present study thus suggests
that the formation of biogenic Fe(III) minerals lowers rather than
increases As removal efficiency of the filters probably due to the
repulsion of the negatively charged arsenate by the negatively charged
biogenic minerals. For this reason we recommend excluding microorganisms
from filters (e.g., by activated carbon filters) to maintain their high
As removal capacity. |
| dauerhafte UFZ-Verlinkung | https://www.ufz.de/index.php?en=20939&ufzPublicationIdentifier=11436 |
| Kleinert, S., Muehe, E.M., Posth, N., Dippon, U., Daus, B., Kappler, A. (2011): Biogenic Fe(III) minerals lower the efficiency of iron-mineral-based commercial filter systems for arsenic removal Environ. Sci. Technol. 45 (17), 7533 - 7541 10.1021/es201522n |
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