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강제 순환식 Air-lift Reactor를 이용한 Polyester 감량폐수의 생물학적 처리
이종현,김정목,조무환 嶺南大學校 工業技術硏究所 1994 工業技術硏究所論文集 Vol.22 No.1
For effective treatment E. G.(Ethylene glycol) which is main component of polyester weight loss wastewater and difficult to remove by phycochemical treatment, air-lift reactor using forced circulating was developed. Optimum temperature of continuous process was founded as 30∼35℃, and ?? removal efficiencies were measured as 98.7%, when influent ?? concentration was 3,500㎎/l at hydraulic retention time of 12hrs. Even though, this reactor was no needed sludge recycle and no used support materials, the ?? removal efficiency was similar to that using natural zeolite as support materials, at same condition. Also, that was revealed more than 98% and not related to MLSS concentration at above conditions, but there was no reasons more than needs of MLSS concentration, because dissolved oxygen concentration was linely decreased with increasing of that. The ?? removal efficiency was founded 98%, when F/M ratio and ?? loading rate were 16 ㎏ ??/㎏ MLSS and 14㎏ ??/㎥ ·day, respectively. Kinetics constants such as Y and and ?? were estimated 0.440 ㎎ MLSS/㎎ ?? and 0.065 ??, respectively.
趙武煥 嶺南大學校 工業技術硏究所 1982 연구보고 Vol.10 No.1
Under the assumption that a first order, exothermic reaction takes place in the reactor, and reactant and coolant flow countercurrently without axial and radial dispersions of concentration and temperature in each phase. Temperature and conversion profiles of process stream, and temperature profiles of coolant are estimated numerically along the length of nonisothermal and nonadiabatic tubular reactor. The results are compared with those of isothermal and adiabatic reactors. The effects of various dimensionless parameters on the temperature and conversion profiles are discussed.
회분식 발효 Data를 이용한 생물반응기의 부피산소전달계수(KLa)추산 방법
趙武煥 영남대학교 공업기술연구소 1989 연구보고 Vol.17 No.1
A simple and practical estimation method of volumetirc oxygen transfer coefficient(??)was developed theoretically and was demonstrated experimentally. This new method used real batch fermentation data, i.e., cell density and dissolved oxygen concentration profiles versus time. The advantages of this method were that it estimated kla on the real fermentation conditions, and that kla was not affected by the response time of DO probe.
趙武煥 嶺南大學校 工業技術硏究所 1982 연구보고 Vol.10 No.2
In case of exothermic and very fast catalytic reactions, packed bed reactor may make the problem of hot spot which will cause the thermal deactivation of the catalyst. To avoid this phenomenon the tube-wall reactor whose inside wall is coated with catalyst is receiving increased interest. A non-isothermal analysis is presented of an irreversible gas-phase reaction occurring at the catalytic wall of a tube-wall reactor. The differential equations describing steady-state mass and heat balance is derived for the limiting case in which conversion is limited by the rate of diffusion of reactant to the wall. The results of numerical analysis show that the mass Stanton number, S??, the reactor aspect ratio, a, and isothermal expansion coefficient, ε affect both the conversion of reactant and the temperature of reactor, but the thermal Stanton number, S?? the dimensionless coolant temperature, Y??, the ratio of bulk to total heat transfer coefficient, α, and the thermicity factor, β affect only the temperature of reactor.
조무환,모드안사리,Mohammad Mansoob Khan,사지드안자리 대한금속·재료학회 2015 ELECTRONIC MATERIALS LETTERS Vol.11 No.4
Electrically conductive HCl-doped polyaniline (Pani)@titanium dioxide (TiO2) nanocomposites were prepared by the in-situ oxidative polymerization of aniline in the presence of different amounts of TiO2 nanoparticles. The synthesized Pani@TiO2 nanocomposites were characterized by transmission electron microscopy, X-ray diffraction, UV-visible spectroscopy, and thermogravimetric analysis. The stability of the Pani@TiO2 nanocomposites in terms of their electrical conductivity retention was examined under isothermal and cyclic aging conditions, and compared with that of pure Pani. The Pani@TiO2 nanocomposites showed higher thermal stability than pure Pani. The effect of competitive doping/de-doping by TiO2 was examined at different Pani to TiO2 weight ratios. TiO2 at a higher weight percentage was found to be involved in the de-doping type of interaction with Pani, leading to its neutralization, which was found to be similar to the dedoping phenomenon, as in the case of neutralization in basic media. The novel mechanism for this de-doping type of interaction of TiO2 with Pani has also been proposed.
Enhanced Production of Laccase from Trametes sp. by Combination of Various Inducers
조무환,Moon Yup Jang,Won Youl Ryu 한국생물공학회 2006 Biotechnology and Bioprocess Engineering Vol.11 No.2
In this study, we have attempted to determine the optimum concentration of inducers responsible for effi-cient laccase production by the white-rot fungus, Trametes sp. Variations in laccase activity were investi-gated with changing concentrations of 2,5-xylidine, syringaldazine, ABTS, and guaiacol. Enhancement of peak laccase activity was achieved via the combination of 2,5-xylidine with ABTS, syringaldazine, or guaiacol, resulting in increases of up to 359, 313, and 340%, respectively, as compared to control values. Among the tested inducers, the addition of 0.1 mM of ABTS coupled with 1.0 mM of 2,5-xylidine in the medium after 24 h of cultivation proved optimal with regard to laccase enzyme production.
조무환,Won Youl Ryu,Moon Yup Jang 한국생물공학회 2003 Biotechnology and Bioprocess Engineering Vol.8 No.2
A visual method for the selective screening of lignin degrading enzymes, produced by white rot fungi (WRF), was investigated by the addition of coloring additives to solid media. Of the additives used in the enzyme production media, guaiacol and RBBR could be used for the detection of lignin peroxidase (LiP), manganese peroxidase (MnP) and laccase. Syringaldazine and Acid Red 264 were able for the detection of both the MnP and laccase, and the LiP and laccase, respectively, and a combination of these two additives was able to detect each of the ligninases produced by the WRF on solid media.