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Sedimentation studies have the possibility of providing profile curves and other vital parameters useful for modeling two-phase flow operations and dimensioning of clarification tanks in water purification plants. In continuation of the study on sedimentation of alkaline-earth metal phosphates, the effects of temperature and ion concentration variables on sedimentation rate profiles, order and rate constant of trimagnesium phosphate (TMP) and tribarium phosphate (TBP) precipitates were evaluated at different temperatures using the Modified Isolation (Initial Rate) method. It was found that, for TMP precipitate, initial sedimentation was dependent on temperature variations at high concentrations of magnesium and phosphate ions. On the other hand, it was dependent on temperature at low concentrations (0.02M) of barium and phosphate ions, for TBP precipitate. TMP precipitate content in reaction vessel decreased as temperature of the medium and concentrations of magnesium and phosphate ions mixed were increased. For TBP, precipitate content in reaction vessel increased as temperature of the medium and concentrations of barium and phosphate ions mixed were increased. These results suggest that, although temperature and ion concentration influence sedimentation of precipitate, ion concentration is probably more influential than temperature especially when precipitate content in reaction vessel is high.

Evaluation of the Effects of Temperature and Ion Concentration Variables on Sedimentation of Magnesium and Barium Phosphates in Aqueous Media