Evaluación de la cinética de adsorción de fluoruro de agua natural mediante un lecho fluidizado de hidroxiapatita de calcio

Abstract

EXECUTIVE SUMMARY A fluidized bed with calcium hydroxyapatite (Ca10(PO4)6(OH)2) has been designed to reduce the concentration of fluorides in the natural water of the Totoras sector where fluoride concentrations in natural water exceed on average 3 mg/L F-, through the principle of ion exchange, the kinetics of fluoride adsorption on the solid matrix of commercial PAH was determined following an experimental design 2 at k=3, where by means of the response optimization analysis, the best treatment conditions were identified with a result of 0,83 ± 0, 02 mg/L F- of adsorbate in solution, after three days of treatment with a PAH load of 70 percent or 63 kg at a constant water flow of 2 L/min, indicating a maximum removal efficiency of 75.77 perecent, for which this treatment was adjusted to the linear model of the Langmuir Isotherm to be able to scale up the process to higher flow rates, For this purpose, the linear parameters of the Langmuir model were obtained with values of qmax of 1.15 mg of adsorbate per kg of adsorbent for a binding factor K of 2,76 liters of solution per kilogram of adsorbent.