This study aims to show the catalyst effect for the removal of low molecular weight organics in semiconductor wastewater. To find out the efficiency, experiments were conducted to change in mixing ratio of catalyst with activated carbon. As a result, optimal condition was (Cu+Fe)=8:2 with Aactivated Carbon at pH 3. Acetone was removed approximately 72% and iso propyl alcohol(IPA) was almost removed 100% in the pH3, pH4 except for pH7 condition, the remaining acetone concentration present 51.4ppb in IPA solution, these results is attributed that IPA transformed to acetone after the reaction.