info:eu-repo/semantics/article
P distribution in different sediment fraction of a constructed wetland
Fecha
2011-01Registro en:
Di Luca, Gisela Alfonsina; Mufarrege, María de Las Mercedes; Sanchez, Gabriela Cristina; Hadad, Hernán Ricardo; Maine, Maria Alejandra; P distribution in different sediment fraction of a constructed wetland; IWA Publishing; Water Science And Technology; 63; 10; 1-2011; 2374-2380
0273-1223
CONICET Digital
CONICET
Autor
Di Luca, Gisela Alfonsina
Mufarrege, María de Las Mercedes
Sanchez, Gabriela Cristina
Hadad, Hernán Ricardo
Maine, Maria Alejandra
Resumen
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 Fe 3+ 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.