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GF/C에 고정된 TiO₂와 유동충 반응기를 이용한 Rhodamine B의 광촉매 탈색
박영식,안갑환 한국환경과학회 2003 한국환경과학회지 Vol.12 No.12
The photocatalytic oxidation of Rhodamine B (RhB) was studied using immobilized TiO₂ and fluidized bed reactor. Immobilized TiO₂ onto GF/C was employed as the photocatalyst and a 30 W germicidal lamp was used as the light source and the reactor volume was 4.8 L. The effects of parameters such as the amounts of photocatalyst, initial concentration, initial pH, air flow rate and anion additives (NO₃^(-), SO₄^(2-), Cl-, CO₃^(2-)) competing for reaction. The results showed that the optimum dosage of the immobilized TiO₂ was 40.0 g/L. Initial removal rate of immobilized TiO₂ was expressed Langmuir - Hinshelwood equation.
UV/TiO₂와 유동층 반응기를 이용한 안료의 광촉매 탈색
박영식 한국환경과학회 2004 한국환경과학회지 Vol.13 No.10
The photocatalytic decolorization of Rhodamine B (RhB) was studied using immobilized TiO₂ and fluidized bed reactor. Immobilized TiO₂(length: 1~2 mm, width: 1~3 mm, thickness: 0.5~2 mm) onto silicone sealant was employed as the photocatalyst and a 30 W germicidal lamp was used as the light source and the reactor volume was 4.8 L. The effects of parameters such as the amounts of photocatalyst, initial concentration, initial pH, superficial velocity, H₂O₂ and anion additives. (NO₃^(-), SO₄^(2-), Cl^(-), CO₃^(2-)) The results showed that the optimum dosage of the immobilized TiO₂ were 87.0 g/L. Initial removal rate of RhB of the immobilized TiO₂ was 1.5 times higher than that of the powder TiO₂ because of the adsorption onto the surface of immobilized TiO₂ In the conditions of acidic pH, initial reaction rate was increased slowly and reaction time was shorted. The effect of anion type on the reaction rate was not much.
역유동층 반응기와 삼상유동층 반응기를 이용한 유기물 제거에 관한 연구
박영식,안갑환,추석열,서근학,송승구 부산대학교 1995 生産技術硏究所論文集 Vol.48 No.-
구형의 섬유상 플라스틱을 media로 사용하여 3상 유동층 생물막 반응기와 역유동층 생물막 반응기로 유기물 제거효율을 비교 실험하였다. 유입수의 SCOD가 1800㎎/L였을 때 역유동층 생물막 반응기와 3상 유동층 생물막 반응기의 제거효율은 각각 94%, 92.5%였다. 유기물 부하율이 2㎏COD/㎥.day였을 때 역유동층 생물막 반응기의 미생물 농도는 2810㎎/L, 3상 유동층 생물막 반응기의 경우는 2300㎎/L 였다. 반응기 부피, 공기유량, media 형태 및 폐수성상이 모두 같은 조건에서는 두 반응기 모두 유기물 제거효율과 미생물 농도 등에서 거의 비슷한 거동을 나타내었다. A number of experiments were conducted to examine the COD removal efficency and the biomass concentration of the three phase fluidized bed biofilm reactor(TFR) and inverse fluidized bed biofilm reactor(IFR) using fibrous plastic ball and synthetic wastewater. When the influent SCOD was 1800㎎/L, SCOD removal efficiency of IFR and TFR were 94% and 92.5%, respectively. When organic loading rate was 2㎏COD/㎥.day, the biomass concentrations of the IFR and the TFR were 2810㎎/L and 2300㎎/L, respectively. When operated at the same conditions on reactor volume, air flow rate, media type and wastewater characteristic, two reactors showed a very similar performance.
담체의 표면거칠기와 전단응력이 미생물 부착에 미치는 영향
박영식,송승구,이채남,최윤찬 부산대학교 환경문제연구소 1995 環境硏究報 Vol.13 No.-
The propose of this paper was to examine the effect of surface roughness and shear stress of support medium on the development of biofilm in a rotating biological contactor. The surface roughness of PMMA as a support media was adjusted to 0.4, 0.8, 1.2, and 3㎛, respectively. Shear stress was varied with speed of rotating biological contactor. At low shear stress, bacterial attachment was not varied greatly with surface roughness. But at increased shear stress, bacterial attachment was changed sharply with surface roughness.
공기 양정(air lift) 펌프를 응용한 슬러지 배출장치에 대한 연구
안갑환,박영식 한국환경과학회 2004 한국환경과학회지 Vol.13 No.10
Sludge discharger applied the principle of the air lift pump was investigated experimentally for the different design(diameter of discharge pipe, diameter and height of the inside and outside wall) and operating parameters(air flow rate, water level). And it was conducted that performance comparison about sludge discharger and conventional air lift pump. The result indicated that discharged liquid were increased with the increase of air flow rate and water level and decrease distance between inside and outside wall. The discharge pressure was increased with an increase of air flow rate and a decrease of the diameter of the discharge pipe, for both the sludge discharger and the airlift pump. The discharge pressures of the sludge discharger were 3-6 times higher than those of the air lift pump.
마이크로파 여기 플라즈마광 생성을 위한 도파관 시스템 설계에 관한 연구
전상재,전후동,송창현,하석영,이승혁,이태호,박의준 금오공과대학교 2005 論文集 Vol.26 No.-
In this paper, the plasma lighting system(PLS) excited by the commercial high power magnetron is developed. The design concepts are based on maximizing the huninous efficacy in conjunction with the miniaturization of waveguide system Furthermore the fine tuning is simplified by using only one stub, and the impedance matching is maximized by introducing the tapering technique. The experimental results show that the luminous efficacy can be dramatically improved by the proposed design method.
The Purification and Characterization of Bacillus subtilis Tripeptidase (PepT)
Park, Yong-Seek,Cha, Myung-Hoon,Yong, Whan-Mi,Kim, Hyo-Joon,Chung, Il-Yup,Lee, Young-Seek Korean Society for Biochemistry and Molecular Biol 1999 Journal of biochemistry and molecular biology Vol.32 No.3
A tripeptidase (PepT) was purified to homogeneity from Bacillus subtilis through four sequential chromatographies including DEAE-Sepharose ion exchange, hydroxylapatite, mono-Q FPLC ion exchange, and Superose-12 FPLC gel filtration. The apparent molecular mass of the enzyme was 49,200 Da and 51,400 Da as determined by sodium dodecylsulfatepolyacrylamide gel electrophoresis (SDS-PAGE) and gel filtration chromatography, respectively, and the enzyme exists in a monomeric form. The physicochemical properties of the enzyme were as follows: optimum pH at 7.5, optimum temperature at $60^{\circ}C$, and pI at 4.9. The $K_m$ and $V_{max}$ values of the enzyme were 4.3 mM and 2.5 mmol/min/mg, respectively, with MetAla-Ser as substrate. The B. subtilis PepT requires $Co^{2+}$ ion(s) for activation, while it is inactivated by EOTA and 1,10-phenanthroline, suggesting that it is a metalloprotein. The enzyme was not inhibited by any of serine protease, aspartic protease, or leucine aminopeptidase inhibitors. The enzyme showed comparable activities towards four different substrates including Met-Ala-Ser, Leu-Gly-Gly, Leu-Ser-Phe, and Leu-Leu-Tyr. The amino terminal sequence of PepT determined by Edman degradation was found to be MKEEIIERFTTYVXV and turned out to be identical to that of PepT deduced from a cloned B. subtilis pepT.