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Sedimentation Kinetics of Hydrous Ferric Oxides in Ferruginous, Circumneutral Mine Water

Titelangaben

Opitz, Joscha ; Bauer, Martin ; Alte, Matthias ; Schmidtmann, Johanna ; Peiffer, Stefan:
Sedimentation Kinetics of Hydrous Ferric Oxides in Ferruginous, Circumneutral Mine Water.
In: Environmental Science & Technology. Bd. 56 (2022) Heft 10 . - S. 6360-6368.
ISSN 0013-936X
DOI: https://doi.org/10.1021/acs.est.1c07640

Angaben zu Projekten

Projekttitel:
Offizieller Projekttitel
Projekt-ID
SFB 1357 Mikroplastik
Ohne Angabe

Projektfinanzierung: Deutsche Forschungsgemeinschaft
German Federal Environmental Foundation (33012/01-23) DFG (391977956 - SFB 1357)

Abstract

Transport, transformation, and removal of iron in aqueous environments is primarily controlled by ferrous iron oxidation followed by aggregation and sedimentation of the resultant hydrous ferric oxides. The latter mechanisms are particularly important for passive iron removal in mine water treatment systems, yet the interrelation and underlying kinetics are poorly understood. In this study, the sedimentation behavior of natural hydrous ferric oxides was systematically investigated under different hydrogeochemical conditions via laboratory-based column experiments. The objective was to determine a robust model approach for the approximation of aggregation/sedimentation kinetics in engineered systems. The results showed that sedimentation is governed by two interrelated regimes, a rapid second-order aggregation-driven step (r1) at high iron levels followed by a slower first-order settling step (r2) at lower iron levels. A mixed first-/second-order model was found to adequately describe the process: with kr1 = 9.4 × 10–3 m3/g/h and kr2 = 5.4 × 10–3 h–1. Moreover, we were able to demonstrate that the removal of particulate hydrous ferric oxides at low particulate iron levels (<10 mg/L) may be reasonably well approximated by a simplified first-order relationship: with ksed = 2.4 (±0.4) × 10–2 h–1, which agrees well with incipient literature estimates. Only minor effects of pH, salinity, and mineralogy on kinetic parameters were observed. Hence, the results of this study may be broadly transferrable among different mine sites.

Weitere Angaben

Publikationsform: Artikel in einer Zeitschrift
Begutachteter Beitrag: Ja
Keywords: iron removal; sedimentation column; aggregation; passive treatment; settling pond
Institutionen der Universität: Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Geowissenschaften > Lehrstuhl Hydrologie > Lehrstuhl Hydrologie - Univ.-Prof. Dr. Stefan Peiffer
Fakultäten
Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften
Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Geowissenschaften
Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Geowissenschaften > Lehrstuhl Hydrologie
Titel an der UBT entstanden: Ja
Themengebiete aus DDC: 500 Naturwissenschaften und Mathematik > 550 Geowissenschaften, Geologie
Eingestellt am: 11 Mai 2022 07:25
Letzte Änderung: 12 Okt 2023 09:19
URI: https://eref.uni-bayreuth.de/id/eprint/69575