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

Title data

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. (4 May 2022) .
ISSN 0013-936X
DOI: https://doi.org/10.1021/acs.est.1c07640

Project information

Project title:
Project's official titleProject's id
SFB 1357 MikroplastikNo information

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

Abstract in another language

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.

Further data

Item Type: Article in a journal
Refereed: Yes
Keywords: iron removal; sedimentation column; aggregation; passive treatment; settling pond
Institutions of the University: Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences > Chair Hydrology > Chair Hydrology - Univ.-Prof. Dr. Stefan Peiffer
Result of work at the UBT: Yes
DDC Subjects: 500 Science > 550 Earth sciences, geology
Date Deposited: 11 May 2022 07:25
Last Modified: 11 May 2022 10:55
URI: https://eref.uni-bayreuth.de/id/eprint/69575