Magnetic microparticles as a new tool for lake restoration: A microcosm experiment for evaluating the impact on phosphorus fluxes and sedimentary phosphorus pools

WATER RESEARCH

卷:89

Article

Funes, A.^1,2  de Vicente, J.³  Cruz-Pizarro, L.^1,2  Alvarez-Manzaneda, I.^1,2  de Vicente, I.^1,2 

[1] Univ Granada, Fac Ciencias, Dept Ecol, E-18071 Granada, Spain

[2] Univ Granada, Inst Agua, E-18071 Granada, Spain

[3] Univ Granada, Fac Ciencias, Dept Fis Aplicada, E-18071 Granada, Spain

关键词: Magnetic particles;    Eutrophication;    Phosphorus adsorption;    Wetlands;    Lake restoration;   

DOI  :  10.1016/j.watres.2015.11.067

来源: Elsevier

【 摘 要 】

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:Pmobiie 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 Pmobiie 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 longterm P efflux. (C) 2015 Elsevier Ltd. All rights reserved.

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