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이재욱,정흥조,곽동희 대한상하수도학회 2002 상하수도학회지 Vol.16 No.5
Adsorption equilibrium and kinetics of phenol on powdered activated carbons were investigated in a finite batch adsorber. Single-species adsorption equilibrium data from an aqueous solution were fitted by three single-species isotherms with two and three parameters such as Langmuir, Freundlich, and Sips equations. Intraparticle diffusion was assumed to be the surface diffusion mechanism and the effective diffusion coefficient was determined by comparing experimental and predicted concentration histories in a finite batch adsorber. The applicability of powdered activated carbon in DAF (dissolved air flotation) process can be observed for the simultaneous removal of organic materials and suspended solids.
조류와 유기화합물의 동시제거를 위한 흡착 - DAF 복합공정
이재욱,곽동희,최승필,정흥조 대한상하수도학회 2004 상하수도학회지 Vol.18 No.2
Dissolved air flotation (DAF) is an effective solid/liquid separation process for low density floc particles such as algal, color-alum and clay-alum flocs produced from low turbidity water. The removal of taste and odorcausing organics (2-mthylisoboneol and geosmin) originating from algae in drinking water is a local and worldwide concern. Although DAF has been effectively applied for the removal of suspended solid, its application for the treatment of dissolved organic carbon is very limited. In this study, a new hybrid system consisting of adsorption and DAF processes was introduced for the simultaneous removal of algae and taste and odorcausing organics. Powdered activated carbon (PAC) was used as an adsorbent. In this proposed system, the major concern of eliminating the spent PAC from the system was also addressed. It was found that zeta potential of algae and PAC was increased with coagulant dosage, and the removal efficiency in DAF was also enhanced up to 90-95% under the given experimental conditions. Based on this study, the hybrid process was found to be a promising technology for the simultaneous removal of algae and dissolved organic pollutants.
DAF 공정에서 무기 고형입자의 유체역학적 충돌효율과 부상특성
곽동희,김성진,이화경,정흥조,이재욱,정팔진 대한상하수도학회 2002 상하수도학회지 Vol.16 No.6
Separation characteristics of inorganic particles occurred during heavy rainwater were investigated in DAF (dissolved air flotation) process. In order to remove the inorganic particles effectively, the collision and flotation efficiencies were examined from a hydrodynamic point of view. Generally, the collision efficiency increased with floc size under the variation of fluid dynamic conditions including inertial force. However, more precise model should be required to analysis the collision efficiency expressed both the physical properties for inorganic particles and hydrodynamic conditions for a reactor.
김광섭,심승우,나현정,조인철,정흥조,박찬영 전남대학교 촉매연구소 2001 觸媒硏究 論文集 Vol.22 No.-
Fruit are normally kept in a pouch of cold storage room in winter. In this work, a mathematical model that is emulating the fruit respiration in the pouch of the storage has been established. The calculated result is compared to the actual measured gaseous composition change of pear in the packaging pouch LDPE film incorporated with silver coated ceramic powder. The presented model, that is combining polysaccharide digestion kinetics in pear, Fickian diffusion for permeation of the film and sigmoidal adsorption equilibrium between the film and gases, predicts the respiration of the pear in the packing film fairly well.
( Heung-joe Jung ) 조선대학교 공학기술연구원 2017 공학기술논문지 Vol.10 No.4
TiO<sub>2</sub> spherical particles were prepared using hydrothermal reaction at different temperatures of 110, 150 and 190℃ for 5 h. The TiO<sub>2</sub> samples were characterized by BET, XRD and SEM analysis. Specific surface areas and particle sizes are in the range of 148 ~ 240 m<sup>2</sup>g<sup>-1</sup> and 323 - 450 nm, composed of tiny nanoparticles with size of 5 ~ 7 nm. It was found that photocatalytic degradation of methylene blue is highly sensitive to particle sizes on the adsorption and photocatalysis.
Jung, Heung-Joe The Korean Institute of Electrical and Electronic 2011 Transactions on Electrical and Electronic Material Vol.12 No.3
Titanium dioxide ($TiO_2$) thin films were deposited by the sol-gel method with a surfactant-assisted mechanism. Its application for dye-sensitized solar cells (DSSCs) was investigated. Brunauer-Emmett-Teller, X-ray diffraction and field emission scanning electron microscopy techniques were used to characterize the surface characteristics of thin films. Photovoltaic-current density measurements were performed to determine the photoelectrochemical properties of the thin films and the performance of DSSCs. Energy conversion efficiency of about 6.1% was achieved for cells with conductive glass under illumination with AM 1.5 (100 $mWcm^{-2}$) simulated sunlight. Investigation showed higher photo-energy conversion efficiency for mesoporous $TiO_2$ nanocrystalline films used in DSSCs relative to commercially available Degussa P25 films.