Literature by the same author
plus at Google Scholar

Bibliografische Daten exportieren
 

Impact of iron addition on phosphorus dynamics in sediments of a shallow peat lake 10 years after treatment

Title data

Münch, Melanie A. ; van Kaam, Rianne ; As, Karel ; Peiffer, Stefan ; ter Heerdt, Gerard ; Slomp, Caroline P. ; Behrends, Thilo:
Impact of iron addition on phosphorus dynamics in sediments of a shallow peat lake 10 years after treatment.
In: Water Research. Vol. 248 (2024) . - 120844.
ISSN 0043-1354
DOI: https://doi.org/10.1016/j.watres.2023.120844

Project information

Project title:
Project's official title
Project's id
EU-Projekt "P-TRAP", Grant Agreement
No information

Project financing: EU-Bildungsprogramme

Abstract in another language

Internal phosphorus (P) loading is a key water quality challenge for shallow lakes. Addition of iron (Fe) salts has been used to enhance P retention in lake sediments. However, its effects on sediment geochemistry are poorly studied, albeit pivotal for remediation success. Here, we assess the factors controlling the retention of P and long-term effects following application of FeCl3 (0.5–1 mol Fe/m2, 2010) in the eutrophic, shallow peat lake Terra Nova (the Netherlands). Treatment reduced P levels in the lake for two years, but afterwards summer release of P intensified, resulting in higher surface water P concentrations than before treatment. Porewater and sediment analyses indicate that the majority of the added Fe is still undergoing redox cycling within the top 10 cm of sediment accounting for the binding of up to 70 % of sedimentary P. Sequential extractions further suggest that organic matter (OM) plays a key role in the resulting P and Fe dynamics: While reduction of P binding Fe(III) phases results in P release to porewaters, the produced Fe2+ remains bound to the solid phase presumably stabilized by OM. This causes P release from the sediments in excess to Fe during temporary low oxygen conditions in summer months, as confirmed by whole core flux incubation experiments. Quantitative coprecipitation of P with Fe upon reoxygenation of the water body is then impossible, leading to a gradual increase in surface water P. This first long-term study on a shallow peat lake underpins the role of OM for Fe cycling and the need to carefully consider the sediment properties and diagenetic pathways in the planning of Fe-amendments.

Further data

Item Type: Article in a journal
Refereed: Yes
Keywords: Internal phosphorus loading; Iron treatment; Lake restoration; Sediment geochemistry; Shallow peat lake
Subject classification: Hydrochemistry
Hydrology
Aquatic Geochemistry
Institutions of the University: Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences > Chair Hydrology
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences > Chair Hydrology > Chair Hydrology - Univ.-Prof. Dr. Stefan Peiffer
Faculties
Faculties > Faculty of Biology, Chemistry and Earth Sciences
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences
Result of work at the UBT: Yes
DDC Subjects: 500 Science > 550 Earth sciences, geology
Date Deposited: 28 Nov 2023 07:59
Last Modified: 26 Mar 2024 10:01
URI: https://eref.uni-bayreuth.de/id/eprint/87880