Removal of phosphorus from water using active barriers : Al2O3 immobilized on to polyolefins
2011
Oliveira, M. | Ribeiro, Daniel | Nóbrega, J. M. | Machado, A. V. | Brito, A. G. | Nogueira, R.
Fundação para a Ciência e a Tecnologia (FCT) - SFRH/BD/39085/2007, PPCDT/AMB/61155/2004
Mostrar más [+] Menos [-]Phosphorus is known to contribute to eutrophication of fresh water systems, as generally it is the limiting nutrientcontrolling algae growth. Laboratory studies were conducted to develop and test active barriers composed ofaluminium oxide immobilized on to polyolefins to remove phosphorus from water. For this purpose, flat plates ofpolyethylene and polyethylene grafted with maleic anhydride were prepared and tested. The adsorption mechanismof phosphorus on to aluminium oxide was described by the Freundlich isotherm. The optimum pH interval forphosphorus removal was between 5.2 and 7.8, which includes the pH of natural waters. The maximum phosphorusremoval capacity was around 11.1ìg/cm2for both active barriers. Both barriers removed more than 90% ofphosphorus from a 100ìg/L solution in a static batch experiment carried out for 90 d. Thein situimplementation ofthe active barriers developed in the present study might be a valuable strategy to sequester phosphate and thus tocontrol eutrophication in natural ecosystems, though further work is required to evaluate possible interferencescoming from other substances present in the water.
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