The removal of Cadmium, Lead, and Chromium from refinery effluent using activated carbon prepared from cow bone with 0.5M ZnCl2 as a chemical reagent was conducted via batch adsorption and study through by varying dosage. Result show that the highest removal efficiency was obtain in favor of Lead (89.5%), while the optimal effect of dosage on the adsorbate was obtained in favor of chromium (52.7%-72.7%). The adsorption process obeys the freundlish and Langmuir isotherm model indicating a monolayer formation over the surface of the material. Langmuir isotherm had a better fit than Freundlich models with the correlation coefficient, R2 for cadmium, lead, and chromium at 0.9962, 0.9990 and 0.9994 respectively. While the correlation coefficient, R2 for Freundlich isotherm models for cadmium, lead, and chromium are 0.9952, 0.9984 and 0.9984 respectively.

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