In Shiwha/Banwal industrial complex, activated carbons are widely used to remove VOCs. General method of regenerating activated carbons is proceeded at high temperature (800℃). But it causes loss of activated carbons and high cost. In this study, activated carbons were treated at a low temperature of 170℃ to avoid these. Desorption reactions were analyzed based on the data obtained from a thermogravimetric analyzer. THC(Total Hydro Carbon) analyzer was used to analyze desorption reaction of activated carbons.