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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.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.
조무환,김동암 한국초지조사료학회 1983 한국초지조사료학회지 Vol.4 No.1
조무환,이진태,김준하,Henry C. Lim 한국화학공학회 2010 Korean Journal of Chemical Engineering Vol.27 No.3
A modified version of the IAWQ activated sludge model No. 1 (ASM 1) is adopted for the simulation of a sequencing batch reactor (SBR) to optimize the removal of nitrogen (T-N) and organic matters (COD) from wastewater. Since the removal of nitrogen requires both aerobic nitrification and anaerobic denitrification, we seek to find the optimal strategies of substrate fill and aeration. Substrate filling strategy critically influences the removal efficiency of T-N and COD; one fast discrete fill in the beginning of a cycle leads to the best result, while a slow continuous fill results in poor nitrification. In addition, the total aeration time is more important for the removal efficiency than the aeration frequency. A short aeration is beneficial for T-N removal, while a long aeration is beneficial for COD removal as expected. As a result, there is an optimal condition of aeration for the simultaneous removal of T-N and COD.
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.
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.