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영어

Removal performance of the photocatalyst biofilter hybrid system for the removal of Styrene was evaluated to optimize operation conditions. First, to investigate the photocatalytic degradation of styrene, various nanocrystalline TiO2 thin films have been prepared by sol-gel method. And the optical fibers are employed as the light-transmitting guide with the immobilizing TiO2. Light source was used 500W high pressure mercury UV lamp. The effects of the inlet concentration of styrene, flow rate, relative humidity and the thickness of TiO2 thin films on the degradation of the styrene were examined. In addition, the effects of some metal ions that can be doped into the TiO2 thin films were considered in order to get higher photocatalytic degradation. Biofiltration involves the passage of a polluted air stream through a packed bed containing microorganisms immobilized within a biofilm attached to the bed-packing material. A biofilter system used in this study was packed with glass-type media with 5L of bed volume and inoculated with mixed microorganisms obtained from a sewage treatment plant. The biofilter systems were operated at an EBRT (Empty Bed Retention Time) of 20~30s under nitrogen deficient condition where nutrient solution was supplied only 1 L every 2 weeks. Toluene concentration of 10~20 ppmv corresponded to elimination capacity 12 ~ 60 g/m3 h. Air flow rate is 10L/min. GC (Gas Chromatography) and MS (Mass Spectroscopy) were used for analysis of the Toluene removal capacity and detection of Toluene degradation byproduct.