期刊
JOURNAL OF HAZARDOUS MATERIALS
卷 192, 期 3, 页码 995-1001出版社
ELSEVIER
DOI: 10.1016/j.jhazmat.2011.05.090
关键词
High gradient magnetic separation; Phosphorus; Eutrophication; Magnetic particles; Chemical interferences
资金
- Junta de Andalucia, Spain [RNM-6630]
- University of Granada [2953/07]
- MICINN (Spain) [MAT-2010-15101]
A promising method for lake restoration is the treatment of lake inlets through the specific adsorption of phosphate (P) on strongly magnetizable particles (Fe) and their subsequent removal using in-flow high gradient magnetic separation (HGMS) techniques. In this work, we report an extensive investigation on the chemical interferences affecting P removal efficiencies in natural waters from 20 Mediterranean ponds and reservoirs. A set of three treatments were considered based on different Fe particles/P concentration ratios. High P removal efficiencies (>80%) were found in freshwater lakes (conductivities < 600 mu S cm(-1)). However, a significant reduction in P removal was observed for extremely high mineralized waters. Correlation analysis showed that major cations (Mg2+, Na+ and K+) and anions (SO42- and Cl-) played an essential role in P removal efficiency. Comparison between different treatments have shown that when increasing P and Fe concentrations at the same rate or when increasing Fe concentrations for a fixed P concentration, there exist systematic reductions in the slope of the regression lines relating P removal efficiency and the concentration of different chemical variables. These results evidence a general reduction in the chemical competition between P and other ions for adsorption sites on Fe particles. Additional analyses also revealed a reduction in water color, dissolved organic carbon (DOC) and reactive silicate (Si) concentrations with the addition of Fe microparticles. (C) 2011 Elsevier B.V. All rights reserved.
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