원문정보
초록
영어
A large quantity of volatile organic compounds (VOCs) is released from various industrial plants
and processes. These VOCs will become atmospheric pollutants and are facing increasingly
stringent environmental regulations. Most VOC emitted to the atmosphere are likely to be harmful
to human health as generating nausea, headaches and irritation, affecting the nervous and breathing systems, initiating cancers, etc. In this study, the removal of gaseous styrenee as experiment of TiO2/biofilter hybrid system was invesgated the industry. Removal performance of the photocatalyst biofilter hybrid system for the styrene was evaluated to optimize the operation
conditions. Firstly to investigate the photocatalytic degradation of styrene, various nanocrystalline
TiO2 thin films have been prepared by a sol-gel method. The optical fibers are employed as the
light-diffusing guide with the immobilizing TiO2. A 500 W high pressure mercury UV lamp was
used as the light source. 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 doped onto the TiO2 thin films were considered in order to get higher photocatalytic degradation. The hybrid system was operated at an EBRT (Empty Bed ResidenceTime) of 20~30 s under nitrogen deficient condition where nutrient solution was
supplied only 1 L every 2 week. When ERBT was 30 s and average inlet concentration is 3.56~109.03 ppmv , average RE(Removal Efficiency) is 89.2 %. High elimination capacity of
styrene could be achieved with the following operating conditions, 25~30℃, relative humidity
85~95 %, EBRT 20~30 s, mass loading rate 13.15~107.70 g/m3․h. During more than 3 months
operation, maximal, hybrid system showed that the removal efficiencies were more than 80~99 %
at inlet styrene concentration of 23.56~193 ppmv which corresponded to elimination capacity of
13.15~107.70 g/m3․h. Compared with other experiment, this study had equal removal efficiency
in a hybrid system or reference UV reactor, and had more than 10~20 % efficiencies in a biofilter.