Abstract
Crystallization process in a fluidized bed reactor to remove fluoride from industrial wastewaters has been studied as a suitable alternative to the chemical precipitation in order to decrease the sludge formation as well as to recover fluoride as synthetic calcium fluoride. In the modeling, design and control of a fluidized bed reactor for water treatment it is necessary to study the particle growth kinetics. Removal of fluoride by crystallization process in a fluidized bed reactor using granular calcite as seed material has been carried out in a laboratory-scale fluidized bed reactor in order to study the particle growth kinetics for modeling, design, control and operation purposes. The main variables have been studied, including superficial velocity ( SV, m s - 1 ), particle size of the seed material ( L 0 , m) and supersaturation ( S ). It has been developed a growth model based on the aggregation and molecular growth mechanisms. The kinetic model and parameters given by the equation G = ( 2.26 × 10 - 10 + 2.82 × 10 - 3 L 0 2 ) SV 0.5 S fits well the experimental data for the studied range of variables.
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