The purpose of this research is to treat the laboratory wastewater from Institut Pertanian (INTAN) Yogyakarta by decreasing the amount of Fe(III) and Cd(II) metals. The method was used is the adsorption method by black carbon granules. Amount of 5, 10, 15, 20, and 25 grams of black carbon granule was added in each of 100 mL of wastewater. Then it was soaked for 24 hours. The wastewater then filtered and analyzed by Atomic Absorption Spectrophotometry (AAS). The results showed the adsorption capacity of Fe(III) and Cd(II) metals was influenced by the number of black carbon granules. 5 grams of black carbon granules was the best treatment for decreasing the Fe(III) and Cd(II) metals in wastewater. The adsorption capacity of Fe(III) is 1.304 mg/L and for Cd(II) is 0.029 mg/L.

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