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The removal characteristics of ethyl acetate and 2-butanol were investigated in a bench-scale down-flow biofilter packed with Jeju scoria medium. Various inlet concentrations and gas flow rates were tested. The adaptation times of microorganisms to the change of the influent concentration of ethyl acetate and 2-butanol gas were found to be about 3 days. At the inlet concentration of 300 ppmv and empty bed contact time (EBCT) of 15 see, the removal efficiencies of the biofilter for ethyl acetate and 2-butanol were above 99.9%. The maximum removal capacity of the biofilter for ethyl acetate was 316-3 18 g/m(3)/h and that for 2-butanol was 245-251 g/m(3)/h. Overall, the removal capacity of the biofilter for ethyl acetate was 50-70 g/m(3)/h larger than that for 2-butanol. During the operation of 65 days, the pressure drop through the biofilter column was maintained below 13 mmH(2)O/m. Although the pH in the drain water decreased from 7.2 to 5.0, the pH drop did not affect the removal of the oases. From the above results, the biofilter using Jeju scoria as a packing material seemed to very effectively treat waste oases such as ethyl acetate and 2-butanol.