Removal of volatile organic compounds (VOCs) by photocatalytic reaction in fluidized bed reacotrs = 유동층 반응기에서 광촉매 반응을 이용한 휘발성유기화합물질 제거 연구

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The photocatalytic degradation characteristics of trichloroethylene (TCE), acetone, and toluene have been determined in an annular flow type, an annulus fluidized bed, a circulating fluidized bed photoreactors. The effects of trichloroethylene (TCE) gas flow rate, relative humidity, $TiO_2$ film thickness, and UV light intensity on photodegradation of TCE have been determined in an annular flow type photoreactor. Phosgene and dichloroacetyl chloride formation could be controlled as a function of TCE gas flow rate and photodegradation of TCE decreased with increasing relative humidity. The optimum thickness of $TiO_2$ film was found to be approximately 5 ㎛ and the photocatalytic reaction rate of TCE increased with square root of UV light intensity. The decomposition of TCE by photocatalysis increases with decreasing initial TCE concentration and increasing gas-residence time. The effects of superficial gas velocity $(U_g)$, wavelength and intensity of ultraviolet (UV) light, oxygen and $H_{2}O$ concentration on the photocatalytic degradation of TCE (Trichloroethylene) over $TiO_2/SiO_2$ catalyst have been determined in an annulus fluidized bed photoreactor. The key factor in determining the performance of the annulus fluidized bed photoreactor is found to be an optimum superficial gas velocity $(U_g)$ that provides the optimum UV light transmit through the proper size of bubbles in the photoreactor. The degradation efficiency of TCE increases with light intensity but decreases with wavelength of the UV light and $H_2O$ concentration in the fluidized bed of $TiO_2/silica-gel$ photocatalyst. The optimum concentration of $O_2$ for TCE degradation is found to be approximately 10%. In addition, the effects of the initial TCE concentration, phase holdup ratio of gas and solid phases $(\epsilon_g /\epsilon_s)$, CuO loading on the photodegradation of TCE have been determined in an annulus fluidized bed photoreactor. The TCE photodegradation decreased...
Advisors
Kim, Sang-Doneresearcher김상돈researcher
Description
한국과학기술원 : 생명화학공학과,
Publisher
한국과학기술원
Issue Date
2004
Identifier
237618/325007  / 000995320
Language
eng
Description

학위논문(박사) - 한국과학기술원 : 생명화학공학과, 2004.2 , [ x, 143 p. ]

Keywords

PHOTOCATALYTIC; FLUIDIZED BED; VOLATILE ORGANIC COMPOUNDS; 휘발성 유기화합물질; 광촉매; 유동층

URI
http://hdl.handle.net/10203/29255
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=237618&flag=dissertation
Appears in Collection
CBE-Theses_Ph.D.(박사논문)
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