Methyl mercaptan (MT) is one of the 22 legal designated odorous compounds in Korea. It has been reported as the main malodorous compounds of odor problems found from foot-and-mouth disease in 2012. This study on the removal of MT using the pallet-type activated carbon fiber (ACF) was carried out to get an optimum inflow loading rate and an optimum residence time required for the effective ACF odor removal device. As a result of the study, if the loading rate of MT runs at or below 0.5 g-S/kg dry ACF/d, MT removal rate by ACF could reach about 95%. However, based on the effect of Dimethyl Disulfide (DMDS) which is the reaction product of MT partial oxidation, it was estimated that the deodorizer of ACF should keep the optimum loading rate of MT less than or equal to 0.2 g-S/kg dry ACF/d. When ACF deodorizers were processed with Space Velocity (SV) at 600 h-1, the effect of DMDS was found, even though MT was not detected at the outlet. Therefore, in order to meet the outlet gas of the odor concentration which is less than or equal to 100 D/T, it is recommended that the optimum values of SV and EBRT were less than 300 h-1 and more than 12 seconds, respectively.

Bio sparging experiments were conducted in a laboratory column to investigate the potential removal of diesel contaminated groundwater. The objectives in this study were (a) to determine the extent of diesel degradation in laboratory columns under supplement of nutrient; (b) to determine the effect of variation of air flow in the removal of diesel and (c) to evaluate the potential enhancement of diesel degradation as a function of temperature. Our results showed that the nutrient supplement and higher air flow greatly enhanced diesel degradation. However, the variation of water temperature examined slightly increased degradation rate of diesel fuel.