The aim of this work was to study the accumulation and fractionation of P in the inlet and outlet sediment of a constructed wetland for the wastewater treatment of a metallurgic plant in Argentina. It was important to predict whether P could be released into the water again by changing environmental conditions or retained over time. P-fractionation was performed using a sequential extraction method. Sediment cores were sliced at depths of: 0–3; 3–7 and 7–10 cm. Sediment showed high pH values and anoxic conditions. In the inlet area, P was principally bound to the carbonate fraction, whereas in the outlet area, it was mainly bound in the residual fraction. This behavior was justified by the effluent composition, which is rich in Ca2+ and Fe3+ and presents high values of pH and conductivity. These conditions favor CaCO3 and Fe(OOH)n precipitation and the subsequent sorption of P to their surface. The sediment active layer involved in the exchange reactions was the superficial one (0–3 cm). The wetland is highly efficient in P retention. P was retained by sediment in fractions that will not release it to the water while chemical and environmental conditions of the system are maintained.
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Research Article|
May 01 2011
P distribution in different sediment fraction of a constructed wetland
G. A. Di Luca;
1Química Analítica, Facultad de Ingeniería Química, Universidad Nacional del Litoral, Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Santiago del Estero 2829, Santa Fe (3000), Argentina
E-mail: [email protected]
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M. M. Mufarrege;
M. M. Mufarrege
1Química Analítica, Facultad de Ingeniería Química, Universidad Nacional del Litoral, Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Santiago del Estero 2829, Santa Fe (3000), Argentina
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G. C. Sánchez;
G. C. Sánchez
2Química Analítica, Facultad de Ingeniería Química, Universidad Nacional del Litoral, Santiago del Estero 2829, Santa Fe (3000), Argentina
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H. R. Hadad;
H. R. Hadad
1Química Analítica, Facultad de Ingeniería Química, Universidad Nacional del Litoral, Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Santiago del Estero 2829, Santa Fe (3000), Argentina
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M. A. Maine
M. A. Maine
1Química Analítica, Facultad de Ingeniería Química, Universidad Nacional del Litoral, Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Santiago del Estero 2829, Santa Fe (3000), Argentina
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Water Sci Technol (2011) 63 (10): 2374–2380.
Citation
G. A. Di Luca, M. M. Mufarrege, G. C. Sánchez, H. R. Hadad, M. A. Maine; P distribution in different sediment fraction of a constructed wetland. Water Sci Technol 1 May 2011; 63 (10): 2374–2380. doi: https://doi.org/10.2166/wst.2011.511
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