Magnetic microparticles as a new tool for lake restoration: A microcosm experiment for evaluating the impact on phosphorus fluxes and sedimentary phosphorus pools. (1st February 2016)

• Record Type: Journal Article
• Authors: Funes, A.; de Vicente, J.; Cruz-Pizarro, L.; Álvarez-Manzaneda, I.; de Vicente, I.
• Is Part Of: Water research. Volume 89(2016)
• Page Start: 366
• Page End: 374
• Publication Date: 2016-02-01
• Subjects: Magnetic particles -- Eutrophication -- Phosphorus adsorption -- Wetlands -- Lake restoration; Water -- Pollution -- Research -- Periodicals; 363.7394
• DOI: 10.1016/j.watres.2015.11.067
• Languages: English
• ISSNs: 0043-1354

Abstract

Abstract: In the last decades, magnetic particles (MPs) as adsorbents have gained special attention due to their high adsorption capacity and the possibility of recovering them by applying a magnetic separation gradient. For the first time MPs have been tested as P adsorbents in a microcosm experiment in a context of lake restoration. MPs were added to sediment cores from a hypertrophic lake, at Fe:PMobile molar ratio of 285:1 and 560:1 under both, oxic and anoxic conditions. We have found that, under anoxic conditions (anoxic), MPs are able to reduce P release rate from the sediment to the overlying water and to reduce sedimentary PMobile concentration (a 22–25% reduction within 0–4 cm depth compared to controls). Under oxic conditions, the addition of MPs do not affect P fluxes across the sediment and water interface since the lake sediment is naturally rich in iron oxides. However a measured reduction in sedimentary PMobile concentration (12–16% reduction in 0–10 cm depth) contributes to a potential reduction in long-term P efflux. Graphical abstract: Highlights: Magnetic particles caused a reduction in P release rate under anoxic conditions. No effect of magnetic particles was observed in P fluxes under oxic conditions. Magnetic particles reduced sedimentary mobile P concentration in oxic and anoxic conditions. Organic P forms were preferably adsorbed on MPs.