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In this study, the control efiency of odorous compounds was measured from diverse control process units of14 individual companies located within the Ban-Wall industrial complex of Ansan city, Korea (January to July2005). To quantify the control efiency levels of major odorous compounds, we collected odor samples from boththe front and rear side of 17 control process units(N= 17× 2= 34). If the control efiency is compared for each of32 compounds between different process units, wet scrubber(WS) was found to be the most effective unit in termsof the sum of pollutants showing the positive control signals. Although the WS system shows generally a goodcontrol pattern for VOC, it is not the case for most index odorous pollutants; only 3 out of 12 index compoundswere found to show positive control efiencies. The results of the study also indicated that the control efiencydiffer greatly between different industrial sectors and/or control process types. In the case of leather industry,carbonyl compounds were found to exhibit the highest control efiency with its values varying from 19 to 90%.On the other hand, in the case of metal production sector, VOC recorded the maximum control efciency withvalues varying from 18 to 79%. According to this study, most air pollution control facilities operated in mostcompanies show fairly poor control efficiencies for most malodor compounds. Hence, to obtain best controlefficiency of odorous pollutant emission, acquisition of better information on source characteristics andestablishment of effective control technologies are highly demanding.