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In this work, the experimental design methodology was applied to optimize phosphate recovery percentage occurred in an air agitated column reactor from an aqueous solution containing MAP (magnesium, ammonium, and phosphate) ions. The reactor has three feed ports for fluid intake, while pH solution (8, 9 and 10) was examined to control the levels of supersaturation. The precipitated salts were subjected to characterization through different chemical techniques confirming the presence of high purity of struvite with impurity of sylvite as a mixed slow release fertilizer. Independent variables (pH and the fluid intake rate) in experimental design were used to model and optimize the operating parameters. The optimum operating conditions were quite efficient in trapping 38.02% recovered phosphorus in synthetic solution at pH of 8-10, and fluid intake rate of 30.81 ml/min. Therefore, these optimized conditions could be valuable input data for engineering design-software for successive equipment required in wastewater treatment plant.

Optimized Phosphate Recovery Through MAP Precipitation in an Air Agitated Column Reactor