ABSTRACT In this work the regeneration of spent granular active carbon saturated with phenol was studied in an aqueous solution by using domestic microwave oven, different factors have been studied such as microwave power level, pH of the solution, weight of the regenerated active carbon, volume of the regenerated solution, number of adsorption and regeneration cycles. It was found that, for the same power level, as the time of exposure increases, the regeneration efficiency increases. As, The microwave oven power increase from 160 to 800 W, the regeneration efficiency increase from 60 to 90% after 1.5min of radiation time, during the regeneration process the pH of the solution increase from about 6.03 to 7.15, after 4-5 adsorption/regeneration cycles the adsorption efficiency falls down from 90 to 55%.