To minimize the industrial pollution, advanced wastewater treatment techniques, such as adsorption, are economically and environmentally essential in the removal of organic and inorganic compounds from industrial wastewater. The present study focuses on the use of low cost adsorbent sugarcane bagasse fly ash to adsorb COD content of the combined wastewater of sugar industry. Bagasse Fly ash with specific surface area of 2637.784 cm2/gm is used as a clarifier to the combined waste water of Sugar mill at room temperature. The different dosage of bagasse fly ash is kept in contact for 24 hours and analyzed before and after treatment. The results of COD removal is up to 27.04% and is follow the Freundlich and Langmuir adsorption isotherm.