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This work is studied the effect of operational parameters on the efficacy of composite sorbent in the reclamation of simulated wastewater contaminated with cadmium ions. This sorbent was manufactured from precipitation of hydroxyapatite (resulted from reaction of calcium and phosphate that extracted from cement kiln dust and sewage dead biomass) on the remaining solids from extraction process. The effect of different parameters such as contact time between adsorbate and adsorbent (5-180 min), initial pH of the solution (2-7), adsorbent dosage (0.05-2 g/50 mL) for agitation speed of 200 rpm at 25oC were studied. The best values of these parameters were 120 min, 5, and 0.4 g/50mL for contact time, pH, and adsorbent dosage respectively that achieved the removal efficiencies ranged from 69 to 99.3% due to variation of initial cadmium concentration from 10 to 300 mg/L.

EFFECT OF OPERATIONAL CONDITIONS ON THE REMOVAL OF CADMIUM IONS FROM SIMULATED WASTEWATER USING COMPOSITE SORBENT